JP5493082B2 - Polarization multiplexing transmission system, transmission device, reception device, polarization multiplexing transmission method, reception method, and transmission method - Google Patents

Description

  The present invention relates to a polarization multiplexing transmission system, a transmission device, a reception device, a polarization multiplexing transmission method, a reception method, and a transmission method.

  In recent years, with the spread of wireless communication systems, frequency resources have been depleted mainly in the microwave band, and transmission techniques that achieve high frequency utilization efficiency are required. The orthogonal polarization multiplexing technology pays attention to the wavefront direction of the radio wave radiated from the antenna, and transmits independent signals having wavefronts orthogonal to each other at the same frequency. When this orthogonal polarization multiplexing technique is applied, VH polarization multiplexing using vertical (V) polarization and horizontal (H) polarization can be realized in the case of linear polarization used in fixed wireless communication or the like. In this case, the frequency utilization efficiency is doubled compared to the case where the orthogonal polarization multiplexing technique is not applied (see, for example, Non-Patent Document 1). The VH polarization multiplexed signal can be transmitted / received by, for example, arranging two linear radiating elements orthogonally in a cross shape.

Yamashita, F .; Kobayashi, K .; Ueba, M .; Takeda, Y .; Ando, K., “Variable Polarization / Frequency Division Multiplexing (VPFDM) for Satellite Communications,” IEEE VTC2006-Fall, pp.1-5

  However, up to two axes are orthogonal in the antenna configuration. Therefore, 2 is the upper limit for the number of polarization multiplexing of orthogonal polarization multiplexing. Therefore, it is difficult to multiplex more signals with the orthogonal polarization multiplexing technique.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a polarization multiplexing transmission system, a transmission apparatus, and a reception apparatus that can increase the number of polarization multiplexing of orthogonal polarization multiplexing to 3 or more. Another object is to provide a polarization multiplexing transmission method, a reception method, and a transmission method.

  In order to solve the above-described problem, one embodiment of the present invention provides a first polarization signal using a first polarization and a second polarization using a second polarization orthogonal to the first polarization. Polarization multiplexing comprising a transmitter and a receiver for transmitting a polarization signal by multiplexing and transmitting a non-orthogonal polarization signal using a non-orthogonal polarization with the first polarization and the second polarization. In the transmission system, the transmission device calculates a polarization angle of a polarization plane of the non-orthogonal polarization signal based on reception accuracy representing accuracy of signal reception in the reception device; and The non-orthogonal polarization signal having the polarization plane of the angle calculated by the polarization angle calculation unit is projected onto the first polarization to generate a first mapping component, which is calculated by the polarization angle calculation unit The non-orthogonal polarization signal having an angle polarization plane is projected onto the second polarization to generate a second mapping component. A first polarization transmission unit that transmits the first polarization signal and the first mapping component generated by the projection unit at the same frequency, the second polarization signal, and the projection unit And a second polarization transmission unit that transmits the second mapping component generated by the same frequency at the same frequency, and the reception device includes a first polarization signal and the first mapping component multiplexed with each other. A first polarization receiving unit that receives a multiplexed signal; a second polarization receiving unit that receives a second multiplexed signal in which the second polarization signal and the second mapping component are multiplexed; and the first multiplexing A first demodulation / decoding unit for demodulating and decoding a signal to restore the information sequence of the first polarization signal; and a first replica signal for generating a replica signal of the information sequence restored by the first demodulation / decoding unit And subtracting the first replica signal from the generator and the first multiplexed signal. A first subtractor that generates a signal that does not include the first polarization signal; and a second demodulation that demodulates and decodes the second multiplexed signal and restores the information sequence of the second polarization signal. A decoding unit, a second replica signal generation unit that generates a replica signal of the information sequence restored by the second demodulation decoding unit, and subtracting the second replica signal from the second multiplexed signal A second subtracting unit that generates a signal that does not include the second polarization signal; and a signal generated by the first subtracting unit and / or a signal generated by the second subtracting unit. A third demodulation / decoding unit for restoring the information sequence of the non-orthogonal polarization signal, and calculating the reception accuracy of the first polarization signal and the reception accuracy of the second polarization signal, to the transmission device A reception accuracy calculation unit for transmission.

  One aspect of the present invention is the polarization multiplexing transmission system, wherein the third demodulation / decoding unit is generated by the signal generated by the first subtraction unit and / or the second subtraction unit. The information signal of the non-orthogonal polarization signal is restored by projecting the signal onto the non-orthogonal polarization and demodulating and decoding the projected signal.

  According to one embodiment of the present invention, the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization And a non-orthogonal polarization signal using a non-orthogonal polarization signal that is transmitted in a polarization multiplexed transmission system that multiplexes the non-orthogonal polarization signal using the non-orthogonal polarization and the second polarization. A polarization angle calculation unit that calculates an angle of a polarization plane of the non-orthogonal polarization signal based on a reception accuracy representing the accuracy of the non-orthogonal polarization, and the non-orthogonal plane having a polarization plane of an angle calculated by the polarization angle calculation unit A polarization signal is projected onto the first polarization to generate a first mapping component, and the non-orthogonal polarization signal having a polarization plane with an angle calculated by the polarization angle calculation unit is converted into the second polarization signal. Generated by a projection unit that projects onto a wave to generate a second mapping component, the first polarization signal, and the projection unit. A first polarization transmission unit that transmits the first mapping component at the same frequency, the second polarization signal, and a second polarization component that transmits the second mapping component generated by the projection unit at the same frequency. And a wave transmission unit.

  According to one embodiment of the present invention, the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization And a non-orthogonal polarization signal using a polarization that is non-orthogonal with the second polarization, and a transmission device in a polarization multiplexing transmission system that performs transmission by multiplexing the non-orthogonal polarization signal, A first polarization receiver for receiving a first multiplexed signal obtained by multiplexing the first mapping component obtained by projecting the non-orthogonal polarization signal onto the first polarization; and the second polarization A second polarization receiving unit that receives a second multiplexed signal obtained by multiplexing a signal and a second mapping component obtained by projecting the non-orthogonal polarization signal onto the second polarization; A first demodulating and decoding unit for demodulating and decoding the multiplexed signal of the first polarization signal and restoring the information sequence of the first polarization signal; and a replica of the information sequence restored by the first demodulating and decoding unit A first replica signal generation unit that generates a power signal, and a first subtraction that generates a signal that does not include the first polarization signal by subtracting the first replica signal from the first multiplexed signal. A second demodulation decoding unit that demodulates and decodes the second multiplexed signal to restore the information sequence of the second polarization signal, and a replica signal of the information sequence restored by the second demodulation decoding unit A second replica signal generation unit that generates a signal, and a second subtraction unit that generates a signal that does not include the second polarization signal by subtracting the second replica signal from the second multiplexed signal. A third demodulation / decoding unit that demodulates and decodes the signal generated by the first subtracting unit and / or the signal generated by the second subtracting unit and restores the information sequence of the non-orthogonal polarization signal; Receiving accuracy of the first polarization signal and Calculates the reception accuracy of the second polarized signal, characterized in that it comprises a reception accuracy computing unit to be transmitted to the transmission device.

  According to one embodiment of the present invention, the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization And a polarization multiplexing transmission method for a polarization multiplexing transmission system comprising a transmitter and a receiver for multiplexing and transmitting a non-orthogonal polarization signal using a non-orthogonal polarization with a second polarization and a non-orthogonal polarization. A polarization angle calculating step in which the transmission device calculates an angle of a polarization plane of the non-orthogonal polarization signal based on reception accuracy representing accuracy of signal reception in the reception device; and The non-orthogonal polarization signal having the polarization plane of the angle calculated by the calculation process is projected onto the first polarization to generate a first mapping component, and the angle deviation calculated by the polarization angle calculation process is generated. Projecting the non-orthogonal polarization signal having a wavefront onto the second polarization to generate a second mapping component A first polarization transmission process for transmitting the shadow process, the first polarization signal, and the first mapping component generated by the projection process at the same frequency; the second polarization signal; and the projection process. A second polarization transmission process of transmitting the generated second mapping component at the same frequency; and the receiving device transmits a first multiplexed signal in which the first polarization signal and the first mapping component are multiplexed. A first polarization reception process for receiving; a second polarization reception process for receiving a second multiplexed signal in which the second polarization signal and the second mapping component are multiplexed; and demodulating the first multiplexed signal. A first demodulation and decoding process for decoding and restoring the information sequence of the first polarization signal; and a first replica signal generating process for generating a replica signal of the information sequence restored by the first demodulation and decoding process; Subtracting the first replica signal from the first multiplexed signal Thus, a first subtraction process for generating a signal not including the first polarization signal, and a second demodulation for demodulating and decoding the second multiplexed signal and restoring an information sequence of the second polarization signal A decoding process, a second replica signal generating process for generating a replica signal of the information sequence restored by the second demodulation decoding process, and subtracting the second replica signal from the second multiplexed signal A second subtraction process for generating a signal not including the second polarization signal, and a signal generated by the first subtraction process and / or a signal generated by the second subtraction process is demodulated and decoded. The third demodulation and decoding process for restoring the information sequence of the non-orthogonal polarization signal, the reception accuracy of the first polarization signal and the reception accuracy of the second polarization signal are calculated and transmitted to the transmission device The process of calculating the reception accuracy for transmission and It is characterized by doing.

  According to one embodiment of the present invention, the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization Transmission method in a polarization multiplexing transmission system that multiplexes and transmits a non-orthogonal polarization signal using a non-orthogonal polarization signal and a second polarization and non-orthogonal polarization, A polarization angle calculation process for calculating an angle of a polarization plane of the non-orthogonal polarization signal based on a reception accuracy representing a signal reception accuracy, and a polarization plane of an angle calculated by the polarization angle calculation process The non-orthogonal polarization signal is projected onto the first polarization to generate a first mapping component, and the non-orthogonal polarization signal having a polarization plane with an angle calculated by the polarization angle calculation process is Projecting onto two polarized waves to generate a second mapping component, the first polarized signal, The first polarization transmission process for transmitting the first mapping component generated in the shadow process at the same frequency, the second polarization signal, and the second mapping component generated in the projection process at the same frequency. And a second polarization transmission process of transmitting.

  According to one embodiment of the present invention, the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization A receiving apparatus in a polarization multiplexing transmission system that multiplexes and transmits a non-orthogonal polarization signal using a non-orthogonal polarization signal and a second polarization and a non-orthogonal polarization, A first polarization receiving process of receiving a first multiplexed signal in which a wave signal and a first mapping component obtained by projecting the non-orthogonal polarization signal onto the first polarization are multiplexed; A second polarization receiving process of receiving a second multiplexed signal obtained by multiplexing a two-polarized signal and a second mapping component obtained by projecting the non-orthogonal polarized signal onto the second polarized wave; A first demodulation and decoding process for demodulating and decoding the first multiplexed signal to restore an information sequence of the first polarization signal, and a restoration by the first demodulation and decoding process. A first replica signal generation process for generating a replica signal of the information sequence and a signal not including the first polarization signal by subtracting the first replica signal from the first multiplexed signal A first subtraction process; a second demodulation decoding process for demodulating and decoding the second multiplexed signal to restore the information sequence of the second polarization signal; and information restored by the second demodulation and decoding process A second replica signal generation process for generating a replica signal of the sequence, and a second signal for generating a signal not including the second polarization signal by subtracting the second replica signal from the second multiplexed signal. And a signal generated by the first subtraction process and / or a signal generated by the second subtraction process are demodulated and decoded to restore an information sequence of the non-orthogonal polarization signal. Over-demodulation decoding If, to calculate the reception accuracy of the reception precision and the second polarized signal of the first polarized signal, and having a a receiving accuracy computing process of transmitting to the transmitting device.

  According to the present invention, polarization multiplexing of three or more polarizations can be realized using orthogonal two-polarization multiplexing antennas, and frequency use efficiency can be improved. Further, transmission power control is realized by the transmission device controlling the angle of the polarization plane, and the signal reception accuracy is maintained well.

It is a figure for demonstrating the operation | movement outline | summary of the transmitter in the polarization multiplexing transmission system by one Embodiment of this invention. It is a figure for demonstrating the operation | movement outline | summary of the receiver in the polarization multiplexing transmission system by the embodiment. It is a figure for demonstrating the operation | movement outline | summary of the receiver in the polarization multiplexing transmission system by the embodiment. It is a figure for demonstrating the operation | movement outline | summary of the receiver in the polarization multiplexing transmission system by the embodiment. It is a figure showing the outline of the problem which fails in the decoding demodulation of V polarization signal. It is a figure showing the outline of the processing in this embodiment. It is a functional block diagram which shows the structural example of the transmitter by the same embodiment. It is a flowchart showing the flow of the signal transmission process of a transmitter. It is a functional block diagram which shows the other structural example of the transmitter by the same embodiment. It is a flowchart showing the flow of the signal transmission process of the transmitter by another structural example. It is a functional block diagram which shows the structure of the receiver by the same embodiment. It is a functional block diagram which shows the structure of the demodulation decoding process part of the receiver by the same embodiment. It is a functional block diagram which shows the structure of the demodulation decoding process part of the receiver by the same embodiment. It is a flowchart showing the flow of the signal reception process of a receiver. It is a flowchart showing the flow of the signal reception process of a receiver. It is a block diagram which shows the structure of the modification of a demodulation decoding process part. It is a block diagram which shows the structure of the modification of a transmitter. It is a block diagram which shows the structure of the modification of a demodulation decoding process part. It is a block diagram which shows the structure of the modification of a demodulation decoding process part. It is a figure which shows the polarization multiplexing of the conventional polarization multiplexing transmission system.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 20 is a diagram illustrating polarization multiplexing in a conventional polarization multiplexing transmission system. As shown in the figure, in a conventional polarization multiplexing transmission system, two orthogonally polarized waves having the same frequency, which are orthogonally polarized waves (hereinafter referred to as “V polarized waves”) and horizontal polarized waves (hereinafter referred to as “V polarized waves”). VH polarization multiplexing using “H polarization” is performed, and different signal sequences are transmitted and received for each of the V polarization and the H polarization. The V polarization has a wavefront perpendicular to the ground, and the H polarization has a wavefront parallel to the ground. The V polarization and the H polarization are transmitted in the same or partially overlapping frequency band. In order to perform VH polarization multiplexing, a transmission device of a conventional polarization multiplexing transmission system includes a two-element antenna for VH polarization multiplexing as a transmission antenna, and a reception device for VH polarization multiplexing as a reception antenna. A two-element antenna is provided. The two-element antenna for VH polarization multiplexing is a two-polarization multiplexing antenna. The two-element antenna for VH polarization multiplexing includes a V-polarization antenna and an H-polarization antenna that are orthogonal to each other.

In the polarization multiplexing transmission system of the present embodiment, the transmission device includes a two-element antenna for VH polarization multiplexing as a transmission antenna, and the reception device as a reception antenna, as in the polarization multiplexing transmission system of the prior art. A two-element antenna for VH polarization multiplexing is provided. However, since the polarization multiplexing transmission system of this embodiment performs non-orthogonal polarization multiplexing transmission, in addition to the V polarization and the H polarization, the angle θ _i degrees (0 <θ _i <180) with respect to the ground. ) Wavefront of P_θ _i polarization (i = 1, 2,..., N; n is a positive integer). The P_θ _i polarization is transmitted in a frequency band that is the same as or partially overlapping with the V polarization and the H polarization.

FIG. 1 is a diagram for explaining the outline of signal transmission processing in the transmission apparatus of the polarization multiplexing transmission system according to this embodiment. As shown in the figure, the transmitting apparatus projects a P_θ _i polarization signal with a polarization axis z onto the wavefront of the V polarization to obtain a mapping component with the V polarization axis (y axis). Further, the transmission apparatus projects the P_θ _i polarization signal of the polarization axis z onto the wavefront of the H polarization to obtain a mapping component of the H polarization axis (x axis). That is, the transmission apparatus vector-decomposes the P_θ _i polarization signal into V polarization and H polarization. When the signal component of the polarization axis z of the P_θ _i polarization signal is p_θ _i , the mapping component H _i to the H polarization axis is p_θ _i · cos θ _i , and the mapping component V _i to the V polarization axis is , P_θ _i · cos (π / 2−θ _i ) = p_θ _i · sin θ _i . The transmission device multiplexes the V polarization signal V ₀ and the mapping component V _i (i = 1 to n) of the P_θ _i polarization signal onto the V polarization axis and transmits the multiplexed signal using the V polarization antenna. The wave signal H ₀ and the mapping component H _i (i = 1 to n) of the P_θ _i polarization signal to the H polarization axis are multiplexed and transmitted by the antenna for H polarization. Thereby, it is possible to multiplex and transmit three or more polarized waves by the two-element antenna.
M (A → B) represents the projection conversion from the A polarization to the B polarization. When the A polarization and the B polarization are orthogonal, the conversion result is zero. When the A polarization is non-orthogonal, the conversion result is generally non-zero.

2 to 4 are diagrams for explaining an outline of signal reception processing in the receiver of the polarization multiplexing transmission system according to the present embodiment.
As shown in FIG. 1, the multiplexed polarization transmitted can be demodulated in the receiving apparatus by using interference cancellation processing. Interference cancellation processing is to demodulate and decode any one signal from a received signal in which a plurality of signals are multiplexed, generate a replica signal of the obtained signal, remove it from the received signal, and remove the replica signal. In this process, one of the received signals is further demodulated and decoded to obtain each multiplexed signal.

The non-orthogonal polarization multiplexed P_θ ₁ polarization signal to P_θ _n polarization signal becomes an interference noise component, that is, noise for the V polarization signal V ₀ and the H polarization signal H ₀ that are desired waves. However, if the level of the mapping component Vi of P_shita _i polarized signal than V polarization signal V ₀ is the desired wave is sufficiently low, it is possible to demodulate the V polarization signal V ₀ by the interference removal processing. For the H polarization signal H ₀ is the same. Hereinafter, the flow of processing in the receiving apparatus will be described in detail. The reception signal of the antenna for V polarization, that is, reception in which the V polarization signal V ₀ and the mapping component V _i (i = 1 to n) of the P_θ _i polarization signal to the V polarization axis are multiplexed. The signal is referred to as “V polarization processing target signal RV ₀ ” in the following description. Further, the reception signal of the antenna for H polarization, that is, reception in which the H polarization signal H ₀ and the mapping component H _i (i = 1 to n) of the P_θ _i polarization signal to the H polarization axis are multiplexed. In the following description, the signal is referred to as “H polarization processing target signal RH ₀ ”. Also, for simplicity in the following description, the case of i = 1, i.e., in addition to the V polarization signal and the H polarization signal, will be described that receives P_shita ₁ polarized signals.

The receiving apparatus demodulates and decodes the V polarization processing target signal RV ₀ to restore the information sequence of the V polarization signal V ₀ . Receiving apparatus generates a replica signal of the V polarization signal V ₀ by performing re-encoding and re-modulating based on the restored information sequence (replica V polarization signal V ₀ ') (Fig. 2A). Next, the receiving apparatus removes the replica V polarization signal V ₀ ′ from the V polarization processing target signal RV ₀ to generate the V polarization processing target signal RV ₁ . In this description, since i = 1, the V polarization processing target signal RV ₁ does not include other signal components. Therefore, the V polarization processing target signal RV ₁ is the mapping component V ₁ of the V polarization axis of the P_θ ₁ polarization signal (FIG. 3A).

Then, the receiving device projects the image component _{V 1} of the V polarization axes of P_shita ₁ polarized signal to P_shita ₁ polarization, generates a P_shita ₁ polarized signal V components (Fig. 4A). The receiving apparatus also performs the above processing on the H polarization processing target signal RH ₀ to generate a P_θ ₁ polarization signal H component (FIGS. 2B, 3B, and 4B). Receiver, by combining the P_shita ₁ polarized signal V component and P_shita ₁ polarized signal H component, to restore the P_shita ₁ polarized signals. Then, the receiving device restores the information sequence by demodulating and decoding the P_shita ₁ polarized signals. As synthesis means, various synthesis means such as maximum ratio synthesis, in-phase synthesis, and selective synthesis can be used. Diversity combining gain can be obtained by performing combining in this way.

When i is 2 or more, the receiving apparatus operates as follows. Receiving device based on the recovered information sequence from P_shita ₁ polarized signals, performs re-encoding and re-modulation, to generate a P_shita ₁ polarized signal replica signal (replica P_shita ₁ polarization signal). Next, the receiving apparatus projects the replica P_θ ₁ polarization signal onto the V polarization plane to generate a mapping component V ₁ ′. Next, the reception apparatus removes the mapping component V ₁ ′ from the V polarization processing target signal RV ₁ to generate the V polarization processing target signal RV ₂ . In this description, since i is 2 or more, the V polarization processing target signal RV ₂ may include other signal components. However, among the signal components included in the V polarization processing target signal RV ₂ , the signal level of the mapping component V _{2 obtained} by projecting the P_θ ₂ polarization signal onto the V polarization plane is sufficiently higher than the signal levels of the other signals. If larger, the receiving apparatus can restore the mapping component V ₂ by the above-described interference cancellation process.

Then, the receiving device projects a mapping component _{V 2} to P_shita ₂ polarization, generates a P_shita ₂ polarized signals V components. Receiver, the above processing is executed for H polarization processing signal RH _1, to produce a P_shita ₂ polarized signal H component. Receiver, by combining the P_shita ₂ polarized signal V component and P_shita ₂ polarized signal H component, to restore the P_shita ₂ polarization signal. Then, the receiving device restores the information sequence by demodulating and decoding the P_shita ₂ polarization signal.
Thereafter, the receiving apparatus increments i by 2 from 1, and repeatedly executes the above processing until information sequences of all polarization signals are obtained.

Note that the order of demodulation and decoding is determined in advance. For example, in the V polarization signal V ₀ and the P_θ ₁ polarization signal to P_θ _n polarization signal, the V polarization signal V ₀ is the first, and the H polarization In the signal H ₀ and the P_θ ₁ polarization signal to P_θ _n polarization signal, the H polarization signal H ₀ is the first. Among the P_θ ₁ polarization signal to P_θ _n polarization signal, the order is P_θ ₁ polarization signal, P_θ ₂ polarization signal,..., P_θ _n polarization signal. At this time, the V polarization signal V ₀ has a power level that can be demodulated even if the mapping components V _{1 to} V _n of the P_θ ₁ polarization signal to P_θ _n polarization signal onto the V polarization axis are multiplexed, The polarization signal H ₀ has a power level that can be demodulated even if the mapping components H _{1 to} H _n of the P_θ ₁ polarization signal to P_θ _n polarization signal onto the H polarization axis are multiplexed. Similarly, the mapping component V _j of the P_θ _j polarization signal (j = 1 to (n−1)) to the V polarization axis is P_θ _{(j + 1)} polarization signal to P_θ V polarization axis of the _n polarization signal. The mapping component H to the H polarization axis of the P_θ _j polarization signal (j = 1 to (n−1)) is set to a power level that can be demodulated even if the mapping components V _{(j + 1) to} V _n are multiplexed. _j is, P_θ _{(j + 1)} and polarized signal ～P_shita _n polarization signal mapping component _H to H polarization axis _{(j +} 1) _{~H n} can be demodulated be multiplexed power level. The order of demodulation and decoding of each polarization may be stored in advance in the transmission device and the reception device, and the order determined by the transmission device may be notified to the reception device by a control signal.

The outline of the demodulation / decoding process performed by the receiving apparatus is as described above. By the way, the distance attenuation level differs between the V polarization axis and the H polarization axis due to the influence of a shielding object or the like existing in the propagation path. That is, since the V polarization and the H polarization are independent propagation paths, there may be a difference in the received signal level when the reflection environment is different. There are several causes for this phenomenon. For example, “Ulaby, FT; Wilson, EA,“ Microwave Attenuation Properties of Vegetation Canopies, ”IEEE Transactions on Geoscience and Remote Sensing, Volume: GE-23, Issue: 5 pp.746-753, 1985.” Another reason is the difference in thermal noise amount in the RF system (Radio Frequency system) between the V polarization and the H polarization, the difference in power amplifier characteristics, and the like. Also, the distance attenuation level can vary over time. In this case, the signal level received by the element of the V polarization antenna and the element of the H polarization antenna varies. For example, even if the polarization angle of the non-orthogonal polarization signal is π / 4 and the mapping components to the H polarization and V polarization are evenly allocated in the three polarization multiplexing, there may be a difference in the received SINR. . If the reception level of the V polarization signal is not sufficiently high with respect to the noise power generated in the receiver, the demodulation and decoding of the V polarization signal fails. In this case, since the replica signal of the V polarization signal cannot be generated, the P_θ _i polarization cannot be demodulated and decoded.

FIG. 5 is a diagram showing an outline of the problem that the decoding / demodulation of the above-described V polarization signal fails. FIG. 5A shows a specific example of a signal transmitted from the antenna for H polarization among signals transmitted from the transmission apparatus. In the signal transmitted from the antenna for H polarization, the H polarization signal H ₀ and the mapping component H _i (i = 1 to n) of the P_θ _i polarization signal to the H polarization axis are multiplexed. In the case of FIG. 5A, i = 1, and the H polarization signal H ₀ and the mapping component H _{1 of the} P_θ ₁ polarization signal to the H polarization axis are multiplexed. FIG. 5B illustrates a specific example of a signal transmitted from the V polarization antenna among signals transmitted from the transmission apparatus. In the signal transmitted from the V polarization antenna, the V polarization signal V ₀ and the mapping component V _i (i = 1 to n) of the P_θ _i polarization signal to the V polarization axis are multiplexed. In the case of FIG. 5B, i = 1, and the V polarization signal V ₀ and the mapping component V ₁ on the V polarization axis of the P_θ ₁ polarization signal are multiplexed.

  FIG. 5C shows a specific example of a signal received by the antenna for H polarization among signals received by the receiving device. In this case, the distance attenuation level on the H polarization axis is small. Therefore, there is almost no attenuation between the signal transmitted from the H polarization antenna of the transmission apparatus (FIG. 5A) and the signal received by the H polarization antenna of the reception apparatus (FIG. 5C). For example, the SINR (Signal-to-Interference and Noise power Ratio) in this case is calculated to be 9 dB.

  FIG. 5D illustrates a specific example of a signal received by the V polarization antenna among signals received by the receiving device. In this case, the distance attenuation level on the V polarization axis is large. For this reason, the signal (FIG. 5B) transmitted from the V polarization antenna of the transmission apparatus and the signal (FIG. 5D) received by the V polarization antenna of the reception apparatus are greatly attenuated. For example, the SINR in this case is calculated to be 3 dB.

In such a case, the information sequence can be restored for the V polarization signal V ₀ and the P_θ ₁ polarization signal even if the information sequence can be restored by the demodulation and decoding process for the H polarization signal H _0. It becomes difficult. Such a problem is solved as follows by the polarization multiplexing transmission system of the present embodiment.

The transmission device of the present embodiment controls the angle θ _i of the polarization plane of the P_θ _i polarization according to the signal reception accuracy in the reception device. The transmission device realizes transmission power control by controlling the angle of the polarization plane, and maintains the reception accuracy of the V-polarized signal V ₀ and the H-polarized signal H ₀ well. The reception accuracy represents the accuracy with which a desired signal (or orthogonally polarized signal in the case of the present embodiment) can be accurately demodulated and decoded from the received signal, and is represented by a value such as an error rate in SINR or error correction code processing, for example. Is done.

  FIG. 6 is a diagram illustrating an outline of processing in the present embodiment. When the SINRs of the signals received by the H-polarization antenna and the V-polarization antenna of the reception device are 9 dB and 3 dB, respectively (FIGS. 5C and D), the transmission device uses the angle of the polarization plane of the non-orthogonal polarization signal. By controlling the above, the ratio of the mapping component of the non-orthogonal polarization signal in the polarization having the lower reception accuracy is reduced. In other words, the transmission device increases the ratio of the orthogonal polarization signal in the polarization with the lower reception accuracy by controlling the angle of the polarization plane of the non-orthogonal polarization signal. In the case of FIG. 5, the SI polarization of the orthogonal polarization signal is lower in the V polarization than in the H polarization. In this case, the transmission apparatus controls the angle of the polarization plane of the non-orthogonal polarization signal so as to be away from π / 2. By such control, the mapping component of the non-orthogonal polarization signal to the H polarization axis increases (FIG. 6A), and the mapping component to the V polarization axis decreases (FIG. 6B).

As a result of the above processing, even in the same environment as in FIG. 5D, the SINR of the V polarization signal V ₀ is improved in the signal received by the V polarization antenna of the reception device (FIG. 6D). In this case, the SINR of the V polarization signal V ₀ is improved to 6 dB. Therefore, it becomes possible to accurately demodulate and decode the V polarization signal V ₀ . On the other hand, the SINR of the H polarization signal H ₀ decreases in the signal received by the H polarization antenna of the receiving device (FIG. 6C). However, since the SINR of the H-polarized signal H _{0 was} originally high, even if the SINR is lowered, the SINR is not lowered to the extent that demodulation and decoding are impossible. For example, in the case of FIG. 6C, the SINR of the H polarization signal H ₀ after the decrease is 6 dB. Therefore, similarly to the V polarization signal V ₀ , the H polarization signal H ₀ can be demodulated and decoded with high accuracy.

Hereinafter, when “V polarization processing target signal” is described, it is assumed that one of the V polarization processing target signals RV _{0 to} V polarization processing target signal RV _{(n + 1)} is selected and shown. In the case of “polarization processing target signal”, it is assumed that one of the H polarization processing target signal RH _{0 to} V polarization processing target signal RH _{(n + 1)} is selected and shown, and “processing target signal” is described. In this case, it is assumed that either the V polarization processing target signal or the H polarization processing target signal is selected and shown.

  Next, the configuration and detailed operation of the transmitter and receiver of the polarization multiplexing transmission system will be described.

FIG. 7 is a block diagram showing a configuration of a transmission apparatus according to an embodiment of the present invention.
As shown in the figure, the transmission apparatus 100 includes encoders 110-0 to 110- (n + 1), modulators 120-0 to 120- (n + 1), and projectors 130a-1 to 130a- in one housing. n, projectors 130b-1 to 130b-n, an adder 140a, an adder 140b, an antenna for V polarization 150a, an antenna for H polarization 150b, a transmission power controller 160, and an angle adjuster 170. Is done.

The encoder 110-0 is input information sequence is a bit stream to be transmitted by the V polarization signal _{V 0,} the encoder 110-i (i = 1~n) , by P_shita _i polarization signal An information sequence to be transmitted is input, and an information sequence to be transmitted by the H polarization signal H ₀ is input to the encoder 110- (n + 1). Encoder 110-k (k = 0 to (n + 1)) performs a predetermined error correction encoding on the input information sequence, and converts the error correction encoded information sequence into modulator 120-. output to k. As the error correction code, for example, a Reed-Solomon code, a turbo code, a low density parity check code, or the like can be used.

Modulator 120-k (k = 0 to (n + 1)) modulates the error correction coded information sequence input from encoder 110-k using a predetermined modulation method, and outputs a modulated signal. To do. As the modulation method, for example, BPSK (Binary phase-shift keying), 16QAM (16 Quadrature amplitude modulation), or the like can be used. The modulator 120-0 outputs a V polarization signal V ₀ that is a modulation signal using V polarization, and the modulator 120-i (i = 1 to n) is a modulation signal using P_θ _i polarization. P_θ _i polarization signal is output, and the modulator 120- (n + 1) outputs an H polarization signal H ₀ which is a modulation signal using H polarization.

The projectors 130a-i (i = 1 to n) set the angle P_θ _i of the polarization plane of the P_θ _i polarization according to an instruction from the angle adjuster 170. Then, the projectors 130a-i (i = 1 to n) receive the P_θ _i polarization modulation signal input from the modulator 120-i from the polarization plane set according to the instruction from the angle adjuster 170. Project to the wavefront of V polarization. Projectors 130a-i (i = 1 to n) output mapping component V _i to the V polarization axis obtained by projection to adder 140a. Further, the projectors 130b-i (i = 1 to n) set the angle P_θ _i of the polarization plane of the P_θ _i polarization in accordance with an instruction from the angle adjuster 170. Then, the projectors 130b-i (i = 1 to n) receive the modulation signal of the P_θ _i polarization input from the modulator 120-i from the polarization plane set according to the instruction from the angle adjuster 170. Project onto the wavefront of H polarization. The projectors 130b-i (i = 1 to n) output the mapping component H _i to the H polarization axis obtained by the projection to the adder 140b.

The adder 140a includes a V polarization signal _{V 0} inputted from the modulator 120 - 0, V polarization multiplexing by adding the mapping component _{V i} input from the projector 130a-i (i = 1~n) A signal is generated and output to the V polarization antenna 150a. The adder 140b is an H polarization signal _{H 0} inputted from the modulator 120- (n + 1), H polarized by adding the mapping component _{H i} input from the projector 130b-i (i = 1~n) A wave multiplexed signal is generated and output to the H polarization antenna 150b. The V polarization antenna 150a wirelessly transmits the V polarization multiplexed signal input from the adder 140a. The H polarization antenna 150b wirelessly transmits the H polarization multiplexed signal input from the adder 140b.

The transmission power controller 160 receives information regarding the reception accuracy of the V polarization signal V ₀ and the H polarization signal H ₀ from the reception device. Then, the transmission power control device 160 determines whether or not it is necessary to control the angle θ _i of the polarization plane of the P_θ _i polarization based on the information regarding the reception accuracy of the V polarization signal V ₀ and the H polarization signal H _0. . For example, when the value of the reception accuracy of the V polarization signal V ₀ and the value of the reception accuracy of the H polarization signal H ₀ are different from each other, the transmission power controller 160 determines the angle θ _i of the polarization plane of the P_θ _i polarization. It may be determined that this control is necessary. The transmission power control device 160, when the value of the reception accuracy of the V polarization signal V _0, the ratio of the value of the reception accuracy of the H polarization signal H _0, differs from the preset value, P_shita _i control of the angle theta _i of the plane of polarization of the polarization it may be determined to be necessary. In addition, the transmission power control device 160, when one of the reception accuracy value of the V polarization signal V _{0 and} the reception accuracy value of the H polarization signal H ₀ is lower than a preset threshold value. , It may be determined that it is necessary to control the angle θ _i of the polarization plane of the P_θ _i polarization.

When the transmission power controller 160 determines that the control of the angle θ _i of the polarization plane of the P_θ _i polarization is necessary, the transmission power controller 160 is based on information regarding the reception accuracy of the V polarization signal V ₀ and the H polarization signal H _0. , P_θ _i A new angle θ _i of the polarization plane of the _i polarization is calculated. Then, the transmission power controller 160 notifies the angle adjuster 170 of the calculated new angle θ _i .

For example, the transmission power controller 160 determines the polarization plane of the P_θ _i polarization so that the reception accuracy value of the V polarization signal V _{0 and} the reception accuracy value of the H polarization signal H ₀ are the same value. The angle θ _i is calculated. Specifically, based on the information received from the receiving device, the transmission power control unit 160 sets P_θ so that the SINR of the V polarization signal V _{0 and} the SINR of the H polarization signal H ₀ have the same value. The angle θ _i of the polarization plane of _i- polarization is calculated. In this process, for example, the reception level and the noise level of the V-polarization processing target signal RV ₀ and the H-polarization processing target signal RH ₀ are received from the receiving device, and the SINR of the V-polarization signal V ₀ and the H-polarization signal H _This may be performed by calculating the angle θ _i of the polarization plane of the P_θ _i polarization under the condition that the SINR of ₀ is the same value.

Also, the transmission power control device 160 sets P_θ _i so that the ratio of the reception accuracy value of the V polarization signal V _{0 and} the reception accuracy value of the H polarization signal H ₀ becomes a preset value. The angle θ _i of the polarization plane of the polarization may be calculated. Specifically, based on the information received from the receiving device, the transmission power control unit 160 sets the ratio of the SINR of the V polarization signal V _{0 and} the SINR of the H polarization signal H ₀ to a preset value. Thus, the angle θ _i of the polarization plane of the P_θ _i polarization is calculated. In this process, for example, the reception level and the noise level of the V-polarization processing target signal RV ₀ and the H-polarization processing target signal RH ₀ are received from the receiving device, and the SINR of the V-polarization signal V ₀ and the H-polarization signal H _The calculation may be performed by calculating the angle θ _i of the polarization plane of the P_θ _i polarization under the condition that the ratio with the SINR of ₀ becomes a preset value.

Further, the transmission power control device 160 is configured so that both the value of the reception accuracy of the V polarization signal V ₀ and the value of the reception accuracy of the H polarization signal H ₀ are higher than a preset threshold value. The angle θ _i of the polarization plane of P_θ _i polarization may be calculated. Specifically, the transmission power control unit 160 determines that both the SINR of the V polarization signal V _{0 and} the SINR of the H polarization signal H ₀ are equal to or greater than a preset threshold based on the information received from the reception device. The angle θ _i of the polarization plane of the P_θ _i polarization is calculated so that In this process, for example, the reception level and the noise level of the V-polarization processing target signal RV ₀ and the H-polarization processing target signal RH ₀ are received from the receiving device, and the SINR of the V-polarization signal V ₀ and the H-polarization signal H _The calculation may be performed by calculating the angle θ _i of the polarization plane of the P_θ _i polarization under the condition that the SINR of ₀ is equal to or greater than a preset threshold value. In this case, the threshold value of the reception accuracy of the V polarization signal V ₀ and the threshold value of the reception accuracy of the H polarization signal H ₀ may be set as different values or set as the same value. Also good.

The angle adjuster 170 performs projection based on the new angle θ _i notified from the transmission power control unit 160, and the projectors 130a-i (i = 1 to n) and the projectors 130b-i (i = 1 to n). By this instruction, the vector amount decomposed into the V polarization axis and the H polarization axis is adjusted.

Subsequently, a signal transmission process of the transmission device 100 will be described. FIG. 8 is a flowchart showing the flow of signal transmission processing of the transmission apparatus 100.
The encoder 110-k (k = 0 to (n + 1)) performs error correction encoding of the input information sequence (step S101), and the modulator 120-k corrects the error by the encoder 110-k. The encoded information sequence is modulated (step S102). The transmission power control unit 160 receives information related to the reception accuracy of the V polarization signal V ₀ and the H polarization signal H ₀ (step S103). The transmission power controller 160 calculates a new angle θ _i of the polarization plane of the P_θ _i polarization based on the information regarding the reception accuracy of the V polarization signal V ₀ and the H polarization signal H ₀ (step S104). Then, the transmission power controller 160 notifies the angle adjuster 170 of the calculated new angle θ _i . The angle adjuster 170 performs projection based on the new angle θ _i notified from the transmission power control unit 160, and the projectors 130a-i (i = 1 to n) and the projectors 130b-i (i = 1 to n). The projectors 130a-i (i = 1 to n) set the angle P_θ _i of the polarization plane of the P_θ _i polarization in accordance with an instruction from the angle adjuster 170 (step S105a). Then, the projectors 130a-i (i = 1 to n) obtain the P_θ _i polarization modulation signal modulated by the modulator 120-i from the plane of polarization set according to the instruction from the angle adjuster 170. projected to the polarization axis, to generate a mapping component _{V i} (step S 106 a). The projector 130b-i sets the angle P_θ _i of the polarization plane of the P_θ _i polarization in accordance with an instruction from the angle adjuster 170 (step S105b). Then, the projectors 130b-i (i = 1 to n) receive the modulation signal of the P_θ _i polarization modulated by the modulator 120-i from the polarization plane set according to the instruction from the angle adjuster 170. projected to the polarization axis, to generate a mapping component _{H i} (step S 106 b).

The adder 140a is a mapping component V of the modulation signal of the V polarization signal V ₀ generated by the modulator 120-0 and the modulation signal of the P_θ _i polarization generated by the projectors 130a-i (i = 1 to n). ₁ ~V _n by adding to generate a V polarization multiplexing signal (step S107a), and outputs the V-polarized wave antenna 150a. The adder 140b maps the modulation signal of the H polarization signal H ₀ generated by the modulator 120- (n + 1) and the modulation signal of the P_θ _i polarization generated by the projectors 130b-i (i = 1 to n). The components H _{1 to} H _n are added to generate an H polarization multiplexed signal (step S107b) and output to the H polarization antenna 150b. The V polarization antenna 150a wirelessly transmits the V polarization multiplexed signal input from the adder 140a (step S108a). The H polarization antenna 150b wirelessly transmits the H polarization multiplexed signal output from the adder 140b (step S108b). The V polarization antenna 150a and the H polarization antenna 150b transmit signals simultaneously by radio of the same frequency.

FIG. 9 is a block diagram illustrating another configuration of the transmission apparatus.

In the transmission apparatus 100 illustrated in FIG. 7, one transmission apparatus includes a two-element antenna for VH polarization multiplexing, but in the transmission apparatus 300 illustrated in FIG. 9, each of the transmission units 301-1 to 301-n. However, it has a two-element antenna for VH polarization multiplexing, and multiplexes the V polarization signal and the H polarization signal on the antenna.

The transmission apparatus 200 includes (n + 2) transmission units 201-0, 201- (n + 1), and 301-1 to 301-n each configured by one housing. Note that the housings of the transmitting units 201-0, 201- (n + 1), and 301-1 to 301-n may be used by the same user or may be used by different users. Moreover, each said housing | casing may be installed in the same place, and may be installed in a respectively different place. Transmitting unit 201-0 transmits the V polarization signal _{V 0,} the transmission unit 201- (n + 1) sends the H polarization signal _{H 0.} The transmission unit 201-0 includes an encoder 210-0, a modulator 220-0, and a V polarization antenna 250-0. The transmission unit 201- (n + 1) includes an encoder 210- (n + 1), a modulator 220- (n + 1), a transmission unit 201- (n + 1), and an H polarization antenna 250- (n + 1).

  The encoder 210-0 and the encoder 210- (n + 1) perform the same error correction encoding process as the encoder 110-0 and the encoder 110- (n + 1) of the transmission apparatus 100 illustrated in FIG. . The modulator 220-0 and the modulator 220- (n + 1) perform the same modulation as the modulator 120-0 and the modulator 220- (n + 1) of the transmission apparatus 100 illustrated in FIG. The V polarization antenna 250-0 wirelessly transmits the V polarization signal input from the modulator 220-0. The H polarization antenna 250- (n + 1) wirelessly transmits the H polarization signal output from the modulator 220- (n + 1).

  The transmitter 301-i (i = 1 to n) includes an encoder 310-i, a modulator 320-i, a projector 330a-i, a projector 330b-i, a V polarization antenna 350a-i, and an H polarization. The antenna includes a wave antenna 350b-i, a transmission power controller 160-i, and an angle adjuster 170-i. Encoder 310-i (i = 1 to n) performs error correction encoding processing similar to encoder 110-i of transmitting apparatus 100 shown in FIG. The modulator 310-i (i = 1 to n) performs the same modulation as the modulator 120-i of the transmission device 100 illustrated in FIG.

The projectors 330a-i (i = 1 to n) set the angle P_θ _i of the polarization plane of the P_θ _i polarization in accordance with an instruction from the angle adjuster 170-i. Then, the projectors 330a-i (i = 1 to n) have polarization planes in which the modulation signal of the P_θ _i polarization input from the modulator 320-i is set according to an instruction from the angle adjuster 170-i. To the wavefront of V polarization. Projector 330a-i (i = 1~n) outputs a mapping component _{V i} to V polarization axis obtained by projecting the V-polarized wave antenna 350a-i. Further, the projectors 330b-i (i = 1 to n) set the angle P_θ _i of the polarization plane of the P_θ _i polarization in accordance with an instruction from the angle adjuster 170-i. Then, the projector 330b-i (i = 1~n) are polarization the modulated signal P_shita _i polarized input from the modulator 320-i, and set in response to an instruction from the recliner 170-i To the wave surface of H polarization. The projectors 330b-i (i = 1 to n) output the mapping component H _i to the H polarization axis obtained by the projection to the H polarization antenna 350b-i.
The transmission power control unit 160-i (i = 1 to n) performs the same processing as the transmission power control unit 160 of the transmission device 100 illustrated in FIG. The angle adjuster 170-i (i = 1 to n) performs the same processing as the angle adjuster 170 of the transmission apparatus 100 illustrated in FIG. V polarized wave antenna 350a-i (i = 1~n) are projector mapping component _{V i} to V polarization axes input from 330a-i and transmitted by radio, H polarized wave antenna 350b-i transmits a mapping component H _i to H polarization axes input from the projector 330b-i wirelessly.

Subsequently, a signal transmission process of the transmission device 300 will be described. FIG. 10 is a flowchart showing the flow of signal transmission processing of the transmission apparatus 300. The flowcharts showing the flow of transmission processing in the transmission units 201-1 and 201- (n + 1) are the same flowchart. Therefore, FIG. 10A collectively shows a flowchart corresponding to the transmission units 201-1 and 201- (n + 1). Moreover, the flowchart showing the flow of the transmission process in each transmitter 301-i (i = 1 to n) is the same flowchart. Therefore, a flowchart corresponding to the transmission unit 301-i (i = 1 to n) is collectively shown in FIG. 10B.
In transmission section 201-0, encoder 210-0 performs error correction encoding of the input information sequence (step S201), and modulator 220-0 performs error correction encoding by encoder 210-0. The modulated information series is modulated (step S202) and output to the V polarization antenna 250-0. In the transmitter 201- (n + 1), the encoder 210- (n + 1) performs error correction coding of the information sequence (step S201), and the modulator 220- (n + 1) is the encoder 210- (n + 1). Then, the information sequence that has been subjected to error correction coding is modulated (step S202) and output to the antenna for H polarization 250- (n + 1).

On the other hand, in the transmission unit 301-i (i = 1 to n), the encoder 310-i performs error correction encoding on the input information sequence (step S301), and the modulator 320-i performs encoding. The information sequence that has been subjected to error correction coding by the device 310-i is modulated (step S302). Transmission power control section 160-i receives the information about the reception accuracy of the V polarization signal _{V 0} and the H polarization signal _{H 0} (step S303). The transmission power controller 160-i calculates a new angle θ _i of the polarization plane of the P_θ _i polarization based on the information regarding the reception accuracy of the V polarization signal V ₀ and the H polarization signal H ₀ (step S304). ). Then, the transmission power controller 160-i notifies the calculated new angle θ _i to the angle adjuster 170-i. The angle adjuster 170-i performs projection based on the new angle θ _i notified from the transmission power control unit 160-i and the projectors 330a-i (i = 1 to n) and the projector 330b-. Instructs i (i = 1 to n). The projectors 330a-i (i = 1 to n) set the angle P_θ _i of the polarization plane of the P_θ _i polarization in accordance with an instruction from the angle adjuster 170-i (step S305a). The projectors 330a-i (i = 1 to n) convert the P_θ _i polarization modulation signal modulated by the modulator 320-i from the polarization plane set according to the instruction from the angle adjuster 170-i. projected onto the wave axis, it generates a mapping component _{V i} (step S306a). The projector 330a-i (i = 1~n) outputs the generated mapping component _{V i} for V-polarized wave antenna 350a-i. Further, the projectors 330b-i (i = 1 to n) set the angle P_θ _i of the polarization plane of the P_θ _i polarization in accordance with an instruction from the angle adjuster 170-i (step S305b). The projectors 330b-i (i = 1 to n) convert the P_θ _i polarization modulation signal modulated by the modulator 320-i from the polarization plane set according to the instruction from the angle adjuster 170-i. projected onto the wave axis, it generates a mapping component _{H i} (step S306b). Then, the projector 330b-i (i = 1~n) the generated mapping component _{H i,} and outputs for H-polarized wave antenna 350b-i.

V polarized wave antenna 250-0 transmits wirelessly V polarization signal _{V 0} (step S203). The V polarization antenna 350a-i (i = 1 to n) wirelessly transmits the mapping component V _i of the P_θ _i polarization signal to the V polarization axis (step S307a). The H polarization antenna 350b-i (i = 1 to n) wirelessly transmits the mapping component H _i of the P_θ _i polarization signal to the H polarization axis (step S307b). H polarization antenna 250- (n + 1) transmits the H polarization signal _{H 0} wirelessly (step S203). V-polarization antenna 250-0, V-polarization antenna 350a-i (i = 1 to n), H-polarization antenna 350b-i (i = 1 to n), and H-polarization antenna 250 -(N + 1) means that signals are transmitted simultaneously by radio of the same frequency.

FIG. 11 is a block diagram illustrating a configuration of a receiving device 500 according to an embodiment of the present invention.
As shown in the figure, the receiving apparatus 500 includes a V-polarized antenna 501, an H-polarized antenna 502, demodulation / decoding processing units 600-0 to 600-(n + 1), a combiner 520, a projector 530-0, and A projector 530- (n + 1) is provided.

The V polarization antenna 501 receives the V polarization multiplexed signal, and the H polarization antenna 502 receives the H polarization multiplexed signal. The demodulation / decoding processing unit 600-0 generates an information sequence as a result of the demodulation / decoding process from a V-polarization process target signal which is a signal used when performing the demodulation / decoding process (hereinafter referred to as a “demodulation / decoding target signal”) The V polarization signal V ₀ that is a signal to be processed (hereinafter referred to as “information sequence output target signal”) is demodulated and decoded. Demodulation decoding unit 600- (n + 1) from the H-polarized wave processed signal is demodulated decoded signal, performs demodulation and decoding of the H polarization signal H ₀ is the information sequence output target signal. The demodulation decoding processing unit 600-i (i = 1 to n) performs demodulation decoding of the P_θ _i polarization signal that is the information sequence output target signal from the demodulation decoding target signal.

  FIG. 12 is a block diagram illustrating configurations of the demodulation / decoding processing unit 600-0 and the demodulation / decoding processing unit 600- (n + 1) illustrated in FIG. As shown in the figure, the demodulation / decoding processing unit 600-1 includes a delay unit 611, a transmission path estimator 612, a demodulator 613, a decoder 614, a re-encoder 615, a re-modulator 616, and an amplitude / phase adjuster 617. , A subtractor 618 and a SINR measuring device 630.

  The delay device 611 stores the signal to be demodulated and decoded and adds a time delay. The transmission path estimator 612 estimates transmission path characteristics from a pilot signal or the like included in the demodulation and decoding target signal. The demodulator 613 demodulates the demodulation target signal using the transmission path characteristics estimated by the transmission path estimator 612, and calculates the likelihood of the information sequence of the information sequence output target signal. The decoder 614 performs error correction processing and decoding processing based on the likelihood calculated by the demodulator 613, and obtains an information sequence of the information sequence output target signal. Decoder 614 then outputs an information sequence of the information sequence output target signal.

  The re-encoder 615 performs the same encoding on the information sequence decoded by the decoder 614 as the encoding used in the transmission apparatus that transmitted the information sequence. The re-modulator 616 modulates the information sequence encoded by the re-encoder 615 using the same modulation method as that used in the transmission apparatus that transmitted the information sequence. The amplitude phase adjuster 617 multiplies the signal modulated by the remodulator 616 by the estimated value of the transmission path characteristic estimated by the transmission path estimator 612. By this processing, the amplitude / phase adjuster 617 generates a replica signal that is an estimated signal when the information series output target signal transmitted by the transmission device at the transmission source is received by the own reception device. The subtractor 618 removes the replica signal generated by the amplitude / phase adjuster 617 from the demodulation and decoding target signal output from the delay unit 611. Then, the subtractor 618 of the demodulation decoding processing unit 600-0 outputs the signal after the removal to the projector 530-1. The subtractor 618 of the demodulation decoding processing unit 600- (n + 1) outputs the signal after the removal to the projector 530- (n + 1).

The SINR measurement unit 630 measures the SINR of a signal to be demodulated and decoded based on the signal modulated by the remodulator 616 and the signal output by the subtractor 618. That, SINR measuring instrument 630 of the demodulation decoding unit 600-0 measures the SINR of the V polarization signal _{V 0} with respect to the V polarization processing signal RV _0. Also, SINR measuring instrument 630 of the demodulation decoding unit 600- (n + 1) measures the SINR of the H polarization signal _{H 0} to H polarization processing signal RH _0. Then, the SINR measuring device 630 wirelessly transmits the measured SINR value to the transmission device. Further, when necessary for processing in the transmission apparatus, the SINR measurement device 630 may wirelessly transmit not only the SINR measurement result but also information used when measuring the SINR to the transmission apparatus.

  FIG. 13 is a block diagram illustrating a configuration of the demodulation / decoding processing unit 600-i (i = 1 to n) illustrated in FIG. The demodulation / decoding target signal of the demodulation / decoding processing unit 600-1 is a signal output from the combiner 520. The demodulation / decoding target signal of the demodulation / decoding processing unit 600-i (i = 2 to n) is a signal output from the combiner 623 of the demodulation / decoding processing unit 600- (i-1).

  The demodulation / decoding processing unit 600-i includes a delay unit 611a, a delay unit 611b, a transmission path estimator 612, a demodulator 613, a decoder 614, a re-encoder 615, a re-modulator 616, an amplitude / phase adjuster 617, and a projector. 620a, a projector 620b, a subtracter 621a, a subtracter 621b, a projector 622a, a projector 622b, and a combiner 623. Of the components included in the demodulation / decoding processing unit 600-i, the transmission path estimator 612, the demodulator 613, the decoder 614, the re-encoder 615, the re-modulator 616, and the amplitude / phase adjuster 617 are shown in FIG. The configuration is the same as that of the demodulation / decoding processing unit 600-0 and the demodulation / decoding processing unit 600- (n + 1). Therefore, description of these configurations is omitted.

  The delay unit 611a stores the V subtraction signal and adds a time delay. The V subtraction signal is a signal input to the subtracter 621a. The V subtraction signal in the demodulation / decoding processing unit 600-1 is a signal output from the subtracter 618 of the demodulation / decoding processing unit 600-0, and is the same as the signal input to the projector 530-0. The V subtraction signal in the demodulation / decoding processing unit 600-i (i = 2 to n) is a signal output from the subtracter 621a of the demodulation / decoding processing unit 600- (i-1). The delay unit 611a outputs the V subtraction signal to which the time delay is added to the subtracter 621a. The delay unit 611b stores the H subtraction signal and adds a time delay. The H subtraction signal is a signal input to the subtracter 621b. The H subtraction signal in the demodulation / decoding processing unit 600-1 is a signal output from the subtracter 618 of the demodulation / decoding processing unit 600- (n + 1), and is the same as the signal input to the projector 530- (n + 1). . The H subtraction signal in the demodulation / decoding processing unit 600-i (i = 2 to n) is a signal output from the subtracter 621b of the demodulation / decoding processing unit 600- (i-1). The delay unit 611b outputs the H subtraction signal added with the time delay to the subtracter 621b.

The projector 620a projects the signal output from the amplitude phase adjuster 617 from the P_θ _i polarization axis to the V polarization axis. Then, the projector 620a outputs the signal after projection to the subtracter 621a. The projector 620b projects the signal output from the amplitude phase adjuster 617 from the P_θ _i polarization axis to the H polarization axis. Then, the projector 620b outputs the signal after projection to the subtracter 621b.

  The subtractor 621a removes the replica signal projected onto the V polarization axis by the projector 620a from the V subtraction signal output from the delay device 611a. Then, the subtractor 621a outputs the signal after removal to the projector 622a. The subtractor 621a outputs the signal after removal as a V subtraction signal to the demodulation / decoding processing unit 600- (i + 1). The subtractor 621b removes the replica signal projected onto the H polarization axis by the projector 620b from the H subtraction signal output from the delay unit 611b. Then, the subtractor 621b outputs the signal after removal to the projector 622b. Further, the subtractor 621b outputs the signal after the removal as an H subtraction signal to the demodulation / decoding processing unit 600- (i + 1).

The projector 622a projects the signal output by the subtractor 621a from the V polarization axis to the P_θ _{(i + 1)} polarization axis. Then, the projector 622a outputs the signal after projection to the combiner 623. The projector 622b projects the signal output by the subtractor 621b from the H polarization axis to the P_θ _{(i + 1)} polarization axis. Then, the projector 622b outputs the signal after projection to the combiner 623.

  The combiner 623 combines the signal output from the projector 622a and the signal output from the projector 622b, and outputs the combined signal to the demodulation / decoding processor 600- (i + 1) as a demodulation / decoding target signal.

Returning to FIG. 11, the description of the receiving apparatus 500 will be continued. Projector 530-0 is a signal output by the demodulation decoding section 600-0, projecting from the V polarization axes to P_shita ₁ polarization axis. Then, the projector 530-0 outputs the signal after projection to the synthesizer 520. Projector 530- (n + 1) is a signal output by the demodulation decoding unit 600- (n + 1), projecting from the H polarization axes to P_shita ₁ polarization axis. Then, the projector 530- (n + 1) outputs the signal after projection to the combiner 520.

Subsequently, a signal reception process of the reception device 500 will be described. 14 and 15 are flowcharts showing the flow of signal reception processing of the receiving apparatus 500.
Hereinafter, the receiving apparatus 500, V polarization signal _V 0, P_θ ₁ mapping component _{V 1} of the the V axis of polarization of polarized signals, and the mapping component _{V 2} to V polarization axis of P_shita ₂ polarized signal Is a mapping of the V polarization multiplexed signal, the H polarization signal H ₀ , the mapping component H _{1 of} the P_θ ₁ polarization signal to the H polarization axis, and the mapping of the P_θ ₂ polarization signal to the H polarization axis A case where an H polarization multiplexed signal in which the component H ₂ is multiplexed will be described.

(Process 1): The V-polarization processing target signal RV ₀ that is a V-polarized multiplexed signal output from the V-polarization antenna 501 is input to the demodulation / decoding processing unit 600-0 as a demodulation / decoding target signal. (Step S501a) Further, the H-polarization processing target signal RH ₀ that is an H-polarization multiplexed signal output from the H-polarization antenna 502 is input to the demodulation / decoding processing unit 600- (n + 1) as a demodulation / decoding target signal. (Step S501b).

(Process 2): The V polarization processing target signal RV ₀ is input to the delay unit 611, the transmission path estimator 612, and the demodulator 613 of the demodulation / decoding processing unit 600-0. The transmission path estimator 612 estimates transmission path characteristics from the V polarization processing target signal RV ₀ (step S502a). The demodulator 613 demodulates the V polarization processing target signal RV ₀ using the transmission path characteristic estimated by the transmission path estimator 612, and calculates the likelihood of the information sequence (step S503a). The decoder 614 performs error correction processing and decoding processing based on the likelihood calculated by the demodulator 613 (step S504a). The decoder 614 obtains an information sequence of the V polarization signal V ₀ , outputs it to the upper layer, etc., and outputs it to the re-encoder 615.

(Process 3): The re-encoder 615 performs the same encoding on the information sequence decoded by the decoder 614 as that of the transmission device that is the transmission source of the V polarization signal V ₀ (step S505a). Remodulator 616 to signal re-encoder 615 is encoded, the same modulation and transmission source of the transmission device of the V polarization signal _{V 0} (step S506a).

(Process 4): The amplitude phase adjuster 617 multiplies the signal modulated by the remodulator 616 by the estimated value of the transmission path characteristic estimated by the transmission path estimator 612. The amplitude / phase adjuster 617 generates the replica V polarization signal V ₀ ′ by this processing (step S507a). The subtractor 618 removes the replica V polarization signal V ₀ ′ from the V polarization processing target signal RV ₀ output from the delay unit 611 to generate the V polarization processing target signal RV ₁ (step S508a). The V polarization processing target signal RV ₀ includes a V polarization signal V ₀ , a mapping component V ₁ to the V polarization axis to the P_θ ₁ polarization signal, and a P_θ ₂ polarization signal to the V polarization axis. mapping component V ₂ are multiplexed. Therefore, by replica V polarization signal V _{0 'is} removed from the V polarization processing signal RV _0, mapping component V ₁ and V ₂ are the V polarization processing signal RV _1, which is multiplexed is generated. The subtractor 618 outputs the generated V polarization processing target signal RV ₁ to the projector 530-0 and the SINR measuring device 630. The SINR measuring device 630 measures the SINR of the V polarization signal V _{0 with} respect to the V polarization processing target signal RV ₀ based on the signal modulated by the remodulator 616 and the signal output by the subtractor 618. (Step S509a). Then, the SINR measuring device 630 wirelessly transmits the measured SINR value to the transmission device (step S510a).

(Processing 5): demodulation decoding unit 600- (n + 1), compared H polarization processing signal RH _0, performs the same processing as 2 process 4 (Step S502b～S510b). This process, subtractor 618 of the demodulation decoding unit 600- (n + 1) outputs the H-polarized wave processed signal RH ₁ to projector 530- (n + 1). Further, the SINR measuring device 630 measures the SINR of the H polarization signal H _{0 with} respect to the H polarization processing target signal RH ₀ and transmits the SINR wirelessly to the transmission device.

(Process 6): projector 530-0 generates a mapping component obtained by projecting the V polarization processing signal RV ₁ to P_shita ₁ polarization axis from V polarization axes, and outputs to the combiner 520 (step S511a) . Projector 530- (n + 1) produces a mapping component obtained by projecting the H polarization processing signal RH ₁ to P_shita ₁ polarization axis from H polarization axes, and outputs to the combiner 520 (step S511b).

(Process 7): synthesizer 520 synthesizes the signal output from the signal and projector output from the projector 530-0 530- (n + 1), to produce a P_shita ₁ polarization processing signal (step S512 ). Combiner 520, the generated P_shita ₁ polarization processing signal, and outputs to the demodulation decoding section 600-1. Demodulation decoding section 600-1 performs processing to P_shita ₁ polarization processing signal output from the synthesizer 520 as a demodulated decoded signal.

(Process 8): P_θ ₁ polarization processing signal is input to the transmission path estimator 612 and a demodulator 613 demodulating decoding unit 600-1. The V polarization processing target signal RV ₁ output from the subtracter 618 of the demodulation / decoding processing unit 600-0 is input to the delay unit 611a of the demodulation / decoding processing unit 600-1 as a V subtraction signal. Further, the H polarization processing target signal RH ₁ output from the subtracter 618 of the demodulation / decoding processing unit 600- (n + 1) is input to the delay unit 611b of the demodulation / decoding processing unit 600-1 as the H subtraction signal. . The transmission path estimator 612 estimates channel characteristics from P_shita ₁ polarization processing signal (step S513). Demodulator 613 uses the transmission channel characteristic estimated by the transmission path estimator 612, it calculates the likelihood of the demodulated information sequence to P_shita ₁ polarization processing signal (step S514). The decoder 614 performs error correction processing and decoding processing based on the likelihood calculated by the demodulator 613 (step S515). The decoder 614 obtains an information sequence of the P_θ ₁ polarization signal, outputs it to the upper layer, etc., and outputs it to the re-encoder 615.

(Processing 9): Re encoder 615 information sequence decoded by the decoder 614, performs the transmission source transmitting device similar to encoding of P_shita ₁ polarized signal (step S516). Remodulator 616 to signal re-encoder 615 is encoded, the same modulation and transmission source of the transmission device of P_shita ₁ polarized signal (step S517).

(Process 10): The amplitude phase adjuster 617 multiplies the signal modulated by the remodulator 616 by the estimated value of the transmission path characteristic estimated by the transmission path estimator 612. Amplitude and phase adjuster 617, generates a replica P_shita ₁ polarized signal by the processing (step S518).

(Processing 11): projector 620a is a replica P_shita ₁ polarized signal generated by the amplitude and phase adjuster 617, projecting into the V-polarized wave axial from P_shita ₁ polarization axes (step S519). Subtractor 621a from the V polarization processing signal RV ₁ to 611a delayer is output, removing the replica P_shita ₁ polarized signal projected on V polarization axes (step S520). The V polarization processing signal RV _1, mapping component of the V axis of polarization of P_shita ₁ polarization signal, and the mapping component of the V axis of polarization of P_shita ₂ polarized signals are multiplexed. Therefore, the signal output from the subtractor 621a is a signal containing only the mapping component of the V axis of polarization of P_shita ₂ polarized signal. The subtractor 621a outputs the generated signal to the projector 622a. The subtractor 621a outputs the generated signal as a V subtraction signal to the demodulation / decoding processing unit 600-2. Projector 622a generates a mapping component obtained by projecting the signal output from the subtractor 621a from V polarization axes P_shita ₂ to polarization axes, and outputs to the combiner 623 (step S521).

(Processing 12): projector 620b is a replica P_shita ₁ polarized signal generated by the amplitude and phase adjuster 617 is projected to the H polarization axis from P_shita ₁ polarization axes (step S522). Subtractor 621b, the delay unit 611b from the H polarization processing signal RH ₁ outputted to remove a replica P_shita ₁ polarized signal projected on H polarization axes (step S523). The H-polarized wave processed signal RH _1, mapping component to H axis of polarization of P_shita ₁ polarization signal, and the mapping component to H axis of polarization of P_shita ₂ polarized signals are multiplexed. Therefore, the signal output from the subtracter 621b is a signal containing only the mapping component to H axis of polarization of P_shita ₂ polarized signal. The subtractor 621b outputs the generated signal to the projector 622b. The subtractor 621b outputs the generated signal to the demodulation / decoding processing unit 600-2 as an H subtraction signal. Projector 622b generates mapping component obtained by projecting the signal output from the subtractor 621b from H polarization axes P_shita ₂ to polarization axes, and outputs to the combiner 623 (step S524).

  (Process 13): The combiner 623 combines the mapping component output from the projector 622a and the mapping component output from the projector 622b (step S525). Then, the combiner 623 outputs the combined signal as a demodulation / decoding target signal to the demodulation / decoding processing unit 600-2.

(Processing 14): The demodulation / decoding target signal is input to the transmission path estimator 612 and the demodulator 613 of the demodulation / decoding processing unit 600-2. The transmission path estimator 612 estimates transmission path characteristics from the demodulation and decoding target signal (step S526). The demodulator 613 demodulates the demodulation target signal using the transmission path characteristic estimated by the transmission path estimator 612, and calculates the likelihood of the information sequence (step S527). The decoder 614 performs error correction processing and decoding processing based on the likelihood calculated by the demodulator 613 (step S528). The decoder 614 obtains an information sequence of the signal to be demodulated and decoded and outputs it to the upper layer or the like. Information sequence obtained by the decoder 614 at this time is the information sequence P_shita ₂ polarized signal.

  Note that the demodulation / decoding processing unit 600-i (i = 2 in this description) that performs the last processing includes a delay unit 611a, a delay unit 611b, a re-encoder 615, a re-modulator 616, and an amplitude phase adjuster 617. The projector 620a, the projector 620b, the subtractor 621a, the subtractor 621b, the projector 622a, the projector 622b, and the combiner 623 do not need to perform processing. Therefore, the demodulation / decoding processing unit 600-i (i = 2 in this description) that performs the last processing includes a delay unit 611a, a delay unit 611b, a re-encoder 615, a re-modulator 616, and an amplitude phase adjuster 617. The projector 620a, the projector 620b, the subtractor 621a, the subtractor 621b, the projector 622a, the projector 622b, and the combiner 623 may be omitted.

As described above, all information sequences of the V polarization signal V ₀ , the H polarization signal H ₀ , the P_θ ₁ polarization signal, and the P_θ ₂ polarization signal can be obtained.
Note that the receiving apparatus 500 can also perform pipeline processing on the V polarization multiplexed signal and the H polarization multiplexed signal received at a plurality of timings. For example, the demodulation composite processing unit 600-2 processes the V polarization multiplexed signal and the H polarization multiplexed signal received at a certain timing, and the V polarization received at the next timing in parallel with this processing. The demodulation and decoding processing unit 600-1 can also process the multiplexed signal and the H polarization multiplexed signal.

A right-handed circularly polarized antenna and a left-handed circularly polarized antenna may be used instead of the V-polarized antenna and the H-polarized antenna. In this case, the third to Nth polarization signals may be multiplexed with respect to the right-hand circular polarization signal and the left-hand circular polarization signal. Further, the third to Nth polarization signals do not need to be linearly polarized waves, and generally elliptically polarized waves can be used. The elliptically polarized wave includes a linearly polarized wave and a circularly polarized wave. The transmission power controller 160 without determining the necessity of controlling the angle theta _i of the plane of polarization of P_shita _i polarizations always configured so as to control the angle theta _i of the plane of polarization of P_shita _i polarization May be.

  FIG. 16 is a block diagram illustrating a configuration of a modification example of the demodulation / decoding processing unit 600-0 and the demodulation / decoding processing unit 600- (n + 1). The demodulation / decoding processing unit 600a-0 (600a- (n + 1)) illustrated in FIG. 16 is provided with an error rate measuring unit 640 instead of the SINR measuring unit 630, except for the demodulation / decoding processing unit 600 illustrated in FIG. −0 and demodulation decoding processing unit 600- (n + 1). The error rate measuring unit 640 receives the result of the error correction decoding process from the decoder 614 and measures the error rate. Then, the error rate measuring device 640 wirelessly transmits the measurement result to the transmission device.

17 to 19 are block diagrams illustrating configurations of modified examples of the transmission device and the demodulation / decoding processing unit. The transmission apparatus 200 shown in FIG. 17 is the same as the transmission apparatus 100 shown in FIG. 7 except that it includes an angle adjuster 270 instead of the transmission power control unit 160 and the angle adjuster 170. The angle adjuster 270 receives a new angle θ _i transmitted wirelessly from the receiving device. Then, the angle adjuster 270 projects the projectors 130a-i (i = 1 to n) and the projectors 130b-i (i = 1 to n) so as to perform projection based on the received new angle θ _i. Instruct. By this instruction, the vector amount decomposed into the V polarization axis and the H polarization axis is adjusted.

The demodulation / decoding processing unit 600b-0 and the demodulation / decoding processing unit 600b- (n + 1) illustrated in FIG. 18 are further provided with a transmission power control unit 650, and the demodulation / decoding processing unit 600-0 illustrated in FIG. This is the same as the demodulation / decoding processing unit 600- (n + 1). The transmission power control unit 650 performs the same processing as the transmission power control device 160 based on the result measured by the SINR measuring device 630, and calculates a new angle θ _i . Then, the transmission power control unit 650 transmits the calculated new angle θ _i to the transmission device 200.

The demodulation / decoding processing unit 600c-i illustrated in FIG. 19 includes the demodulation / decoding processing unit 600a-0 and the demodulation / decoding processing unit 600a- (n + 1) illustrated in FIG. 16 except that a transmission power control unit 360 is further provided. The same. The transmission power control unit 360 performs the same processing as the transmission power control device 160 based on the result measured by the error rate measuring device 640, and calculates a new angle θ _i . Then, the transmission power control unit 360 transmits the calculated new angle θ _i to the transmission device 200.

According to the above-described embodiment, polarization multiplexing of three or more polarizations can be realized using a two-element antenna that transmits and receives orthogonal V polarization and H polarization, and frequency use efficiency can be improved. Further, transmission power control is realized by the transmission apparatus controlling the angle of the polarization plane, and the reception accuracy of the V polarization signal V ₀ and the H polarization signal H ₀ is maintained well.

100, 200, 300 ... Transmitters 110-0 to 110- (n + 1), 210-0 to 210- (n + 1), 310-1 to 310-n ... Encoders 120-0 to 120- (n + 1), 220 -0 to 220- (n + 1), 320-1 to 320-n ... modulators 130a-1 to 130a-n, 130b-1 to 130b-n, 330a-1 to 330a-n, 330b-1 to 330b-n ... Projector (projector)
140a, 140b ... adders 150a, 250-0, 350a-1 to 350a-n ... V-polarized antenna (first polarized wave transmitter)
150b, 250- (n + 1), 350b-1 to 350b-n... H polarization antenna (second polarization transmission unit)
160: Transmission power control unit (polarization angle calculation unit)
170 ... Angle adjusters 201-0 to 201- (n + 1), 301-1 to 301-n ... Transmitters 250-1 to 250-n ... P_θ ₁ polarization antenna to P_θ _n polarization antenna 500 ... reception device 501 ... V-polarized antenna (first polarized wave receiver)
502 ... H polarization antenna (second polarization receiving section)
520 ... Synthesizers 600-0 to 600- (n + 1) ... Demodulation and decoding processing units 611a and 611b ... Delay units 612 ... Transmission path estimator 613 ... Demodulator (demodulation decoding unit)
614 ... Decoder (demodulation decoding unit)
615 ... Re-encoder (replica signal generator)
616 ... Remodulator (replica signal generator)
617... Amplitude phase adjuster (amplitude phase adjuster)
618, 621a, 621b ... subtracter (subtraction unit)
630 ... SINR measuring device (reception accuracy calculation unit)
620a, 620b, 622a, 622b ... combiner 640 ... error rate measuring device (reception accuracy calculation unit)

Claims (7)

The first polarization signal and the second polarization signal using the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A polarization multiplexing transmission system comprising a transmitter and a receiver for multiplexing and transmitting non-orthogonal polarization signals using non-orthogonal polarization,
The transmitter is
A polarization angle calculation unit that calculates an angle of a polarization plane of the non-orthogonal polarization signal, based on a reception accuracy representing a signal reception accuracy in the reception device;
The non-orthogonal polarization signal having the polarization plane of the angle calculated by the polarization angle calculation unit is projected onto the first polarization to generate a first mapping component, which is calculated by the polarization angle calculation unit. A projection unit for projecting the non-orthogonal polarization signal having a polarization plane of an angle to the second polarization to generate a second mapping component;
A first polarization transmission unit that transmits the first polarization signal and the first mapping component generated by the projection unit at the same frequency;
A second polarization transmission unit that transmits the second polarization signal and the second mapping component generated by the projection unit at the same frequency;
The receiving device is:
A first polarization receiver for receiving a first multiplexed signal in which the first polarization signal and the first mapping component are multiplexed;
A second polarization receiver for receiving a second multiplexed signal in which the second polarization signal and the second mapping component are multiplexed;
A first demodulation / decoding unit that demodulates and decodes the first multiplexed signal and restores an information sequence of the first polarization signal;
A first replica signal generation unit that generates a replica signal of the information sequence restored by the first demodulation and decoding unit;
A first subtraction unit that generates a signal not including the first polarization signal by subtracting the first replica signal from the first multiplexed signal;
A second demodulation / decoding unit that demodulates and decodes the second multiplexed signal and restores an information sequence of the second polarization signal;
A second replica signal generation unit that generates a replica signal of the information sequence restored by the second demodulation and decoding unit;
A second subtraction unit that generates a signal not including the second polarization signal by subtracting the second replica signal from the second multiplexed signal;
A third demodulation and decoding unit that demodulates and decodes the signal generated by the first subtracting unit and / or the signal generated by the second subtracting unit and restores the information sequence of the non-orthogonal polarization signal;
A reception accuracy calculation unit that calculates the reception accuracy of the first polarization signal and the reception accuracy of the second polarization signal, and transmits the reception accuracy to the transmission device;
A polarization multiplexing transmission system comprising:   The third demodulation / decoding unit projects and projects the signal generated by the first subtraction unit and / or the signal generated by the second subtraction unit onto the non-orthogonal polarized wave. The polarization multiplexing transmission system according to claim 1, wherein the information sequence of the non-orthogonal polarization signal is restored by demodulating and decoding the signal. The first polarization signal and the second polarization signal using the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A transmission device in a polarization multiplexing transmission system that multiplexes and transmits non-orthogonal polarization signals using non-orthogonal polarization,
A polarization angle calculation unit that calculates an angle of a polarization plane of the non-orthogonal polarization signal, based on a reception accuracy representing a signal reception accuracy in the reception device;
The non-orthogonal polarization signal having the polarization plane of the angle calculated by the polarization angle calculation unit is projected onto the first polarization to generate a first mapping component, which is calculated by the polarization angle calculation unit. A projection unit for projecting the non-orthogonal polarization signal having a polarization plane of an angle to the second polarization to generate a second mapping component;
A first polarization transmission unit that transmits the first polarization signal and the first mapping component generated by the projection unit at the same frequency;
A second polarization transmitter that transmits the second polarization signal and the second mapping component generated by the projection unit at the same frequency;
A transmission device comprising: The first polarization signal and the second polarization signal using the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A receiving device in a polarization multiplexing transmission system for multiplexing and transmitting non-orthogonal polarization signals using non-orthogonal polarization,
A first polarization receiver that receives a first multiplexed signal in which the first polarization signal and a first mapping component obtained by projecting the non-orthogonal polarization signal onto the first polarization are multiplexed When,
A second polarization receiving unit that receives a second multiplexed signal in which the second polarization signal and a second mapping component obtained by projecting the non-orthogonal polarization signal onto the second polarization are multiplexed When,
A first demodulation / decoding unit that demodulates and decodes the first multiplexed signal and restores an information sequence of the first polarization signal;
A first replica signal generation unit that generates a replica signal of the information sequence restored by the first demodulation and decoding unit;
A first subtraction unit that generates a signal not including the first polarization signal by subtracting the first replica signal from the first multiplexed signal;
A second demodulation / decoding unit that demodulates and decodes the second multiplexed signal and restores an information sequence of the second polarization signal;
A second replica signal generation unit that generates a replica signal of the information sequence restored by the second demodulation and decoding unit;
A second subtraction unit that generates a signal not including the second polarization signal by subtracting the second replica signal from the second multiplexed signal;
A third demodulation and decoding unit that demodulates and decodes the signal generated by the first subtracting unit and / or the signal generated by the second subtracting unit and restores the information sequence of the non-orthogonal polarization signal;
A reception accuracy calculation unit that calculates the reception accuracy of the first polarization signal and the reception accuracy of the second polarization signal, and transmits the reception accuracy to the transmission device;
A receiving apparatus comprising: The first polarization signal and the second polarization signal using the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A polarization multiplexing transmission method for a polarization multiplexing transmission system comprising a transmitter and a receiver for multiplexing and transmitting non-orthogonal polarization signals using non-orthogonal polarization,
The transmitting device is
Polarization angle calculation process for calculating the angle of the polarization plane of the non-orthogonal polarization signal based on the reception accuracy representing the reception accuracy of the signal in the receiving device;
The non-orthogonal polarization signal having the polarization plane of the angle calculated by the polarization angle calculation process is projected onto the first polarization to generate a first mapping component, which is calculated by the polarization angle calculation process. Projecting the non-orthogonal polarization signal having a plane of polarization of an angle onto the second polarization to generate a second mapping component;
A first polarization transmission process for transmitting the first polarization signal and the first mapping component generated by the projection process at the same frequency;
A second polarization transmission process for transmitting the second polarization signal and the second mapping component generated by the projection process at the same frequency;
The receiving device is
A first polarization reception process for receiving a first multiplexed signal in which the first polarization signal and the first mapping component are multiplexed;
A second polarization receiving process for receiving a second multiplexed signal in which the second polarization signal and the second mapping component are multiplexed;
A first demodulation and decoding process for demodulating and decoding the first multiplexed signal and restoring an information sequence of the first polarization signal;
A first replica signal generation process for generating a replica signal of the information sequence restored by the first demodulation and decoding process;
A first subtraction process for generating a signal not including the first polarization signal by subtracting the first replica signal from the first multiplexed signal;
A second demodulation and decoding process for demodulating and decoding the second multiplexed signal and restoring an information sequence of the second polarization signal;
A second replica signal generation step of generating a replica signal of the information sequence restored by the second demodulation and decoding step;
A second subtraction process for generating a signal not including the second polarization signal by subtracting the second replica signal from the second multiplexed signal;
A third demodulation and decoding process for demodulating and decoding the signal generated by the first subtraction process and / or the signal generated by the second subtraction process and restoring the information sequence of the non-orthogonal polarization signal;
A reception accuracy calculation step of calculating the reception accuracy of the first polarization signal and the reception accuracy of the second polarization signal, and transmitting to the transmission device;
A polarization multiplexing transmission method. The first polarization signal and the second polarization signal using the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A transmission method of a transmitter in a polarization multiplexing transmission system that multiplexes and transmits non-orthogonal polarization signals using non-orthogonal polarization,
Polarization angle calculation process for calculating the angle of the polarization plane of the non-orthogonal polarization signal based on the reception accuracy representing the reception accuracy of the signal in the receiving device;
The non-orthogonal polarization signal having the polarization plane of the angle calculated by the polarization angle calculation process is projected onto the first polarization to generate a first mapping component, which is calculated by the polarization angle calculation process. Projecting the non-orthogonal polarization signal having a plane of polarization of an angle onto the second polarization to generate a second mapping component;
A first polarization transmission process for transmitting the first polarization signal and the first mapping component generated in the projection process at the same frequency;
A second polarization transmission process for transmitting the second polarization signal and the second mapping component generated in the projection process at the same frequency;
A transmission method characterized by comprising: The first polarization signal and the second polarization signal using the first polarization signal using the first polarization and the second polarization signal using the second polarization orthogonal to the first polarization. A receiving method of a receiving device in a polarization multiplexing transmission system that multiplexes and transmits non-orthogonal polarization signals using non-orthogonal polarization,
A first polarization reception process for receiving a first multiplexed signal in which the first polarization signal and the first mapping component obtained by projecting the non-orthogonal polarization signal onto the first polarization are multiplexed When,
A second polarization reception process for receiving a second multiplexed signal in which the second polarization signal and a second mapping component obtained by projecting the non-orthogonal polarization signal onto the second polarization are multiplexed. When,
A first demodulation and decoding process for demodulating and decoding the first multiplexed signal and restoring an information sequence of the first polarization signal;
A first replica signal generation process for generating a replica signal of the information sequence restored by the first demodulation and decoding process;
A first subtraction process for generating a signal not including the first polarization signal by subtracting the first replica signal from the first multiplexed signal;
A second demodulation and decoding process for demodulating and decoding the second multiplexed signal and restoring an information sequence of the second polarization signal;
A second replica signal generation step of generating a replica signal of the information sequence restored by the second demodulation and decoding step;
A second subtraction process for generating a signal not including the second polarization signal by subtracting the second replica signal from the second multiplexed signal;
A third demodulation and decoding process for demodulating and decoding the signal generated by the first subtraction process and / or the signal generated by the second subtraction process and restoring the information sequence of the non-orthogonal polarization signal;
A reception accuracy calculation step of calculating the reception accuracy of the first polarization signal and the reception accuracy of the second polarization signal, and transmitting to the transmission device;
A receiving method comprising:

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