JP6849246B2 - Calling system and communication terminal using waveform selection filter - Google Patents

Description

The present invention relates to a radio wave waveform (specifically, the length of a radio wave (pulse) in the time unit in which the radio wave is generated, even if the radio wave is in the same frequency band or a band in which a plurality of frequencies exist. Related to call methods and call systems that realize waveform selectivity and time domain control using a waveform selection filter (waveform selection metasurface) that has electromagnetic characteristics that enable selective absorption and transmission according to the pulse width). Is.

A conventional wireless multiple access method will be described with reference to FIG. FIG. 10A shows an FDMA method (frequency division multiple access method), FIG. 10B shows a TDMA method (time division multiple access method), and FIG. 10C shows a CDMA method (code division multiple access method). The FDMA method divides the communication signal of each user on the frequency axis (f) and realizes multiplexing. The TDMA method divides the communication signal of each user on the time axis (t) and realizes multiplexing. The CDMA method divides the communication signal of each user on a code axis (diffusion code, etc.) and realizes multiplexing. Since the frequency axis (f), the time axis (t), and the code axis (diffusion code, etc.) are orthogonal (independent), any combination is possible. As an example of realizing this, there is an OFDMA method shown in FIG. 10 (d). The OFDMA method is an FDMA method + TDMA method using orthogonal subcarriers, and realizes multiplexing by dividing the communication signal of each user.
In particular, a wide range of research efforts have been carried out in the wireless multiple access of multiple user wireless communications in the same frequency band, and as described above, the radio frequency resources are divided in the FDMA system, TDMA system, CDMA system, OFDMA system, etc. It is multiplexing. In this way, research efforts to improve the utilization efficiency of frequency resources have been widely undertaken in recent years, and multiple access methods such as the cellular network of mobile phones have been put into practical use. However, the frequency utilization efficiency of the method using the three axes of the frequency axis (f), the time axis (t), and the code axis (diffusion code, etc.) has theoretically reached its limit.

Further, in recent years, communication terminals such as mobile phones and smartphones, wireless LANs, and the like have increased explosively, and it has been pointed out that frequency resources are depleted against the background of such expansion of the use of wireless communication. Further user multiplexing is required due to the depletion of frequency resources.

Non-Patent Document 1 presents a metasurface that non-linearly absorbs a surface current (or surface wave) in order to protect a communicating electronic device from a high power signal. Realistically, a high power signal becomes a radio wave having a short pulse width like an impulse. Therefore, this metasurface absorbs radio waves having a short pulse width and transmits long radio waves, and is attached to the outer shell of the communication device to protect the communication device. Therefore, it is not used for communication itself.

H. Wakatsuchi, S. Kim, J. J. Rushton, D. Sievenpiper, “Waveform-Dependent Absorbing Metasurfaces”, Physical Review Letters 111, 245501, December 2013.

We propose a completely new wireless multiple access method using the new electromagnetic field characteristic "waveform (pulse width) selectivity" invented by the present inventors. This waveform width selectivity is a new electromagnetic field phenomenon in which the electromagnetic field characteristics (transmission, absorption, etc.) can be changed not only by the frequency but also by the pulse length (signal excitation time). By applying this new wireless multiple access method, a "waveform axis" is added to the frequency, time, and code (FDMA method, TDMA method, and CDMA method, respectively), which are the division axes of the conventional multiple access. As a result, we aim to realize frequency utilization efficiency that exceeds the limits of conventional communication theory and to dramatically expand the depleting radio frequency resources.

The present invention introduces the concept of pulse width selectivity (waveform axis) into the three axes of frequency, time, and code in a conventional communication system, and waveform selection by pulse width in the same frequency band or a band in which a plurality of frequencies exist. It provides a multiplexed communication system and a communication terminal using a waveform selection filter that performs the above.
The first invention is a transmitting side communication terminal that controls a pulse width, which is an excitation time of a radio wave, to a specific pulse width to transmit a radio wave, a receiving side communication terminal that receives the radio wave transmitted by the transmitting side communication terminal, and a waveform. with a selective filter, a receiving communication terminal includes a receiving unit, a waveform selection filter to selectively transmit or reflect the radio waves of a specific pulse width, the receiving unit, the waveform selection filter is transmitted A communication system that receives radio waves with a specific pulse width.
Invention 2, the waveform selection filter is characterized Rukoto the intervention between the receiving communication terminal and transmitting communication terminal.
According to the third invention, the waveform selection filter includes a conductive member, a rectifying circuit connecting two places of the conductive member, and one or both of an RL circuit and an RC circuit, and the RL circuit is a circuit element having an inductive component. The RC circuit has a circuit element having a capacity component and a circuit element having a resistance component, and the waveform selection filter absorbs the radio wave by the pulse width which is the excitation time of the radio wave. rate is characterized by different of Rukoto.
According to the fourth aspect of the present invention, the transmitting side communication terminal has a pulse time waveform controller that controls the pulse width of radio waves to a specific pulse width, and a transmitting side frequency converter that performs multiplexing in the frequency domain, and has a transmitting side. The radio wave transmitted by the communication terminal is controlled to a specific pulse width by the pulse time waveform controller, and is multiplexed in the frequency domain by the transmitting side frequency converter, and the receiving side communication terminal has a waveform. It is characterized by having a receiving side frequency converter that selectively receives a signal in a specific frequency domain among radio waves having a specific pulse width transmitted by the selection filter.
According to the fifth aspect of the present invention, the transmitting side communication terminal has a pulse time waveform controller that controls the pulse width of a radio wave to a specific pulse width, and a transmitting side access time controller that performs multiplexing with an access time, and transmits. The radio wave transmitted by the side communication terminal is controlled to a specific pulse width by the pulse time waveform controller, and is multiplexed by the access time by the transmitting side access time controller. The waveform selection filter is characterized by having a receiving side access time controller that selectively receives a signal having a specific access time among radio waves having a specific pulse width.
INDUSTRIAL APPLICABILITY The transmitting side communication terminal has a pulse time waveform controller that controls the pulse width of radio waves to a specific pulse width and a code spreader that performs multiplexing in a spreading code region, and transmits side communication. The radio wave transmitted by the terminal is controlled to a specific pulse width by the pulse time waveform controller, and is multiplexed in the diffused code region by the code spreader, and the receiving side communication terminal uses a waveform selection filter. There among the radio waves of a specific pulse width that has passed, it characterized in that it has a code despreader that selectively receives a signal signal spread with a specific spreading code.
The seventh invention is a receiving side communication terminal that receives radio waves from a transmitting side communication terminal that transmits radio waves by controlling a pulse width, which is an excitation time of radio waves, to a specific pulse width, and provides a waveform selection filter and a receiving unit. a waveform selection filter selectively transmits a radio wave of a specific pulse width, the receiving unit receives a radio wave of a specific pulse width waveform selection filter is transmitted, Ru receiving communication terminal der.
Invention 8, you comprising the pulse time waveform controller for controlling a pulse width which is wave excitation time to send.
The ninth invention is a transmitting side communication terminal for selectively receiving a radio wave having a pulse width which is an excitation time of a radio wave having a specific pulse width, and transmitting the radio wave to a receiving side communication terminal, wherein the pulse width of the radio wave is set. It is a transmitting side communication terminal that transmits radio waves by controlling it to a specific pulse width.

According to the first invention, a transmitting side communication terminal that controls a pulse width, which is an excitation time of a radio wave, to a specific pulse width to transmit a radio wave, and a receiving side communication terminal and a waveform that receives a radio wave transmitted by the transmitting side communication terminal. with a selective filter, a receiving communication terminal includes a receiving unit, a waveform selection filter to selectively transmit or reflect the radio waves of a specific pulse width, the receiving unit, the waveform selection filter is transmitted It is possible to provide a multiplexed communication system that receives radio waves having a specific pulse width. That is, it is characterized in that a specific pulse width is selectively received on the receiving side.
According to the second invention, the waveform selection filter is interposed between a transmitting side communication terminal and a receiving side communication terminal, and is characterized in that a specific pulse width is selectively received on the receiving side.
According to the invention 3, it identifies the specific configuration of the waveform selection filter.
According to the fourth invention, in the frequency division FDMA communication system, a frequency converter and a pulse time waveform controller are installed on the transmitting side, and a waveform selection filter and a frequency converter are installed on the receiving side, so that the pulse width is determined. It is possible to provide a multiplexed communication system by waveform selection.
According to Invention 5, in a time-division TDMA communication system, a pulse is provided by installing an access time controller and a pulse time waveform controller on the transmitting side, and a waveform selection filter and an access time controller on the receiving side. It is possible to provide a multiplexed communication system by selecting a waveform according to the width.
According to Invention 6, in a CDMA communication system that is code division, a waveform selection by pulse width is performed by installing a code diffusion and pulse time waveform controller on the transmitting side, a waveform selection filter on the receiving side, and a code inverse diffusion. It is possible to provide a communication system multiplexed by.
According to the seventh invention, it is possible to provide a receiving side communication terminal equipped with a waveform selection filter.
According to the eighth aspect of the present invention, it is possible to provide a receiving side communication terminal having both a transmitting function and a receiving function.
According to the ninth aspect of the present invention, it is possible to provide a transmitting side communication terminal that transmits radio waves by controlling the pulse width of radio waves to a specific pulse width.
As described above, the communication system and the communication terminal of the present invention can realize the frequency utilization efficiency exceeding the limit of the conventional communication theory and can dramatically expand the depleting radio frequency resources.

(A) The effect of the waveform selection filter 20 is schematically shown. (B) The structure of the waveform selection filter 20 is schematically shown. A schematic structural diagram of four types of the waveform selection filter 20 is shown. The characteristics of four types of the waveform selection filter 20 are shown. The model and evaluation environment for simulation evaluation are shown. The characteristic evaluation (same frequency) by the pulse modulation method is shown. The configuration of the communication system 1 that performs multiplexing by waveform selectivity using the same frequency band or a band in which a plurality of frequencies exist is schematically shown. Example of multiplexing by FDMA and waveform selectivity using the same frequency band or a band in which a plurality of frequencies exist The configuration of the communication system 1 that performs multiplexing by waveform selectivity is schematically shown. An example in which the pulse time waveform controller 10 and the waveform selection filter 20 are attached to the communication terminal 2 is shown. An example of assumed use (example of a wireless LAN network) of a multiple access method by the waveform selection filter 20 is shown. The conventional wireless multiple access method is shown. Pulse modulation method (same frequency) Simulation result of waveform selection filter characteristics (same frequency) Time domain control principle by OFDM Time domain control principle by OFDM (multiple frequencies) Simulation results of waveform selection filter characteristics (multiple frequencies) Multiplexing method using waveform selection filter (transmitting side) Multiplexing method using waveform selection filter (reception side) A method that introduces FDMA for multiplexing by a waveform selection filter (transmission side) A method that introduces FDMA for multiplexing by a waveform selection filter (reception side) A method that introduces FDMA and TDMA for multiplexing by a waveform selection filter (transmitter side) A method that introduces FDMA and TDMA for multiplexing by a waveform selection filter (reception side) A method in which CDMA is introduced for multiplexing by a waveform selection filter (transmitter side) A method in which CDMA is introduced for multiplexing by a waveform selection filter (transmitter, another form) A method in which CDMA is introduced for multiplexing by a waveform selection filter (reception side) Evaluation of multiplexing by waveform selection filter (channel capacity) Evaluation of multiplexing by waveform selection filter (number of users)

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and changes, modifications, and improvements can be made without departing from the scope of the invention.

FIG. 1A schematically shows the effect of the waveform selection metasurface 20 (hereinafter referred to as the waveform selection filter 20).
The radio wave shown on the left side of FIG. 1A is a radio wave on the input side to the waveform selection filter 20, and has the same frequency but different pulse widths. Here, as shown in FIG. 1, the pulse width is the length of the radio wave (pulse) in the time unit in which the radio wave is generated. The pulse width is also the length of time during which radio wave energy is generated (radio wave excitation time).
What is shown in the center of FIG. 1A is selective according to the waveform of the radio wave (specifically, the length of the radio wave (pulse) in the time unit in which the radio wave is generated) even if the radio wave has the same frequency. It is a waveform selection filter 20 having an electromagnetic characteristic that enables absorption and transmission of radio waves. Here, the short wave absorption waveform selection filter 22 that absorbs radio waves having a short pulse width and transmits radio waves having a long pulse width is shown.
The radio wave shown on the right side of FIG. 1A shows that it absorbs a radio wave having a short pulse width and transmits a radio wave having a long pulse width.
FIG. 1B schematically shows the structure of the waveform selection filter 20. There is a dielectric 26 on the metal plate 27, and a plurality of conductive members 25 are arranged on the dielectric 26 to have a flat basic shape. It is based on a two-dimensional plane. Further, by making the curvatures of the metal plate 27, the dielectric 26, and the conductive member 25 laminated on the same portion the same, the waveform selection filter 20 as a whole is semi-cylindrical, hemispherical, conical, or conical. It can be made into a three-dimensional shape based on a parabolic antenna shape. Here, when the metal plate 27 is provided as described above, it is a reflective type, while the waveform selection filter 20 from which the metal plate 27 is abolished is a transmissive type. The waveform selection filter 20 may be a transmissive type or a reflective type.

2 and 3 show schematic structural diagrams and characteristics of four types of the waveform selection filter 20.
A schematic structural diagram of a capacitor-type waveform selection filter 22 (absorption of radio waves with a short pass width) that absorbs radio waves with a short pulse width and transmits radio waves with a long pulse width is shown in FIG. 2 (a) and characteristics are shown in FIG. 3 (a). Shown.
FIG. 2A has a rectifying circuit connecting two places of the conductive member 25 (that is, the conductive member 25 on the left side and the conductive member 25 on the right side), and an RC circuit arranged in the rectifying circuit. A current rectified by the rectifier circuit flows through the RC circuit. This RC circuit has a circuit element C having a capacity component and a circuit element Rc having a resistance component. The circuit element C and the circuit element Rc are connected in parallel.
Here, the pulse width to saturate the absorption curve in FIG. 3 (b) is determined by the time constant of the circuit elements used _{τ (τ = R c C)} .
A schematic structural diagram of an inductor type waveform selection filter 21 (radio wave absorption with a long pulse width) that absorbs radio waves with a long pulse width and transmits radio waves with a short pulse width is shown in FIG. 2 (b) and characteristics are shown in FIG. 3 (b). Shown.
FIG. 2B has a rectifier circuit connecting two points of the conductive member 25 and an RL circuit arranged in the rectifier circuit. A current rectified by the rectifier circuit flows through the RL circuit. This RL circuit has a circuit element L having an inductive component and a circuit element Rl having a resistance component. The circuit element L and the circuit element Rl are connected in series.
Here, the saturated pulse width of the absorption curve in FIG. 3B is determined by the time constant τ (τ = L / R _l ) of the circuit element used.
Next, a schematic structural diagram of the parallel coupling type waveform selection filter 23 is shown in FIG. 2 (c), and the characteristics are shown in FIG. 3 (c). It has a concave absorption characteristic that absorbs radio waves with a short pulse width and radio waves with a long pulse width and transmits radio waves with a pulse width located in the middle.
FIG. 2C shows a rectifier circuit connecting two points of the conductive member 25, and an RL circuit and an RC circuit connected in parallel in the rectifier circuit. A current rectified by a rectifier circuit flows through the RL circuit and the RC circuit. The RL circuit has a circuit element L having an inductive component and a circuit element Rl having a resistance component in series. The RC circuit has a circuit element C having a capacity component and a circuit element Rc having a resistance component in parallel.
_{Here, the absorption curves in FIG. 3C are the time constants τ (L / R l) of the} circuit elements used for the independent long pulse width radio wave absorption waveform selection filter and the short pulse width radio wave absorption waveform selection filter. , R _c C).
Next, a schematic structural diagram of the series-coupled waveform selection filter 24 is shown in FIG. 2 (d), and the characteristics are shown in FIG. 3 (d). It has a convex absorption characteristic that transmits radio waves with a short pulse width and radio waves with a long pulse width and absorbs radio waves with a pulse width located in the middle.
FIG. 2D has a rectifier circuit that connects two points of the conductive member 25, and an RL circuit and an RC circuit that are connected in series in the rectifier circuit. A current rectified by a rectifier circuit flows through the RL circuit and the RC circuit. The RL circuit has a circuit element L having an inductive component and a circuit element Rl having a resistance component in series. The RC circuit has a circuit element C having a capacity component and a circuit element Rc having a resistance component in parallel.
_{Here, the absorption curves in FIG. 3D are the time constants τ (L / R l) of the} circuit elements used for the independent long pulse width radio wave pickup waveform selection filter and the short pulse width radio wave absorption waveform selection filter. , R _c C).
From the above, the waveform selection filter includes a conductive member 25, a rectifying circuit connecting the conductive member 25 at two locations, a circuit element L having an inductive component, and a circuit element R having a resistance component in the rectifying circuit. A filter including an RL circuit, an RC circuit including a circuit element C having a capacity component and a circuit element R having a resistance component, or an RL circuit and an RC circuit, and the absorption rate of the radio wave differs depending on the waveform of the radio wave. ..
The circuit element R having a resistance component does not necessarily have to be a resistance, and a MOSFET or the like can be used instead. Further, the circuit element C having a capacity component does not necessarily have to be a capacitor, and a varicap diode can be used instead.

FIG. 4A shows a simulation evaluation model, in which the radio signal output from the transmitter propagates on the filter and is input to the receiver.
The signal waveform on FIG. 4 (b) shows the signal input to the receiver antenna 31 at the position “★ 1” in FIG. 4 (a), is absorbed by the filter, and corresponds to the pulse width. Absorption has been achieved.
The signal waveform in the lower part of FIG. 4B shows the signal at the position of “★ 2” in FIG. 4A, and the signal input from the receiver antenna 31 is amplified by the amplifier. Thermal noise (Gaussian noise) is added in, and the situation is shown.
FIG. 4C shows the environment for simulation evaluation. The simulation environment is roughly divided into three parts: a transmission unit 51, a channel unit 52, and a reception unit 53. The transmission unit 51 performs signal modulation based on the transmission bit sequence to generate a modulated radio signal. In this simulation, pulse position modulation (PPM), which is one of the simple narrow band pulse modulations, is adopted. In PPM, bit information is a modulation method represented by the temporal position of the first half or the second half of a pulse. In addition, in order to confirm the effect of the waveform selection filter used in the present invention, the pulse generation unit 511 also performs time domain signal processing for shaping the pulse width in addition to generating the carrier signal.
Next, the channel unit 52 simulates the influence of the transmitted radio signal on the radio channel. The transmitted radio signal is first absorbed by the waveform selection filter 20, but in this simulation, the absorption effect of the waveform selection filter 20 is calculated in advance by an electromagnetic field simulation, and the data is used. Additive White Gaussian Noise (AWGN) is assumed as the noise source, and AWGN is added after being absorbed by the waveform selection filter 20.
Finally, the receiving unit 53 performs detection and then demodulation to calculate the bit error rate. In this simulation, energy detection is adopted as the detection method. The receiving unit 53 first calculates two energy values corresponding to the pulse positions from the received signal, and these two output energy values are sequentially input to the comparator 531. The symbol timing obtained by the symbol timing unit 532 is input to the comparator 531 and the comparator 531 compares the two energy values input at appropriate timings to determine the reception bit.

FIG. 5 shows the characteristic evaluation by the pulse modulation method.
A basic evaluation of multiplexing by waveform (pulse width) selectivity was carried out using the waveform (pulse width) selection filter 20 invented by the present inventors.
The graphs of FIGS. 5A and 5B show Eb / N0 on the horizontal axis, which is the ratio of the spectral densities of the energy Eb of the transmission signal to the energy N0 of noise. It is shown that the larger the Eb / N0, the larger the energy Eb of the transmission signal as compared with the noise energy N0.
In the graphs of FIGS. 5A and 5B, the vertical axis shows the bit error rate characteristic (BER), and at what rate bit errors occur in digital transmission. Indicates whether it is. For example, BER = 0.01 indicates that an error occurs on average of 1 bit out of 100 bits, and it can be said that the smaller the BER, the higher the quality of communication.
Here, the reference is the characteristic (W / O SUT) without the waveform selection filter 20 indicated by “X”. If the characteristics using the waveform selection filter 20 are equivalent to the characteristics indicated by "X", the communication has the same quality. The evaluated pulse widths are three levels, and in ascending order of pulse width, the pulse width of the "black square" is 0.02 us, the pulse width of the "black circle" is 2 us, and the pulse width of the "black triangle" is 20 us.
FIG. 5A shows communication characteristics when a capacitor type waveform selection filter 22 (FIGS. 2A and 3A) that absorbs short pulses and transmits long pulses is used. The BER characteristic of the pulse width of 0.02us indicated by the “black square” is significantly deteriorated from the characteristic (W / O SUT) without the capacitor type waveform selection filter 22 indicated by the reference “X”. That is, the radio wave having a short pulse width (0.02us) is selectively absorbed by the capacitor type waveform selection filter 22.
On the other hand, the characteristics of the BER with a pulse width of 2us indicated by "black circles" and a pulse width of 20us indicated by "black triangles" are almost the characteristics (W / O SUT) without the capacitor type waveform selection filter 22 indicated by "X". It is the same and the characteristics have not deteriorated. That is, a radio wave having a pulse width of 2us indicated by a "black circle" or a pulse width of 20us indicated by a "black triangle" has a capacitor-type waveform even if a capacitor-type waveform selection filter 22 that absorbs a short pulse and transmits a long pulse is used. The characteristics are the same as when the selection filter 22 is not used.
Therefore, according to the present embodiment, the waveform selection filter can transmit a signal having a long pulse width without major deterioration and block a signal having a short pulse width.
FIG. 5B shows communication when an inductor type waveform selection filter 21 (FIGS. 2B and 3B) that absorbs radio waves having a long pulse width and transmits radio waves having a short pulse width is used. Shows the characteristics. Further, the characteristic (W / O SUT) without the inductor type waveform selection filter 21 is indicated by “X”. The characteristics of the BER with a pulse width of 2us indicated by "black circles" and a pulse width of 20us indicated by "black triangles" are significantly deteriorated from the characteristics (W / O SUT) without the inductor type waveform selection filter 21 indicated by [X]. ing. On the other hand, the BER characteristic of the pulse width of 0.02us indicated by the “black square” is almost the same as the characteristic (W / O SUT) without the inductor type waveform selection filter 21 indicated by [X], and the characteristic is not deteriorated. .. That is, when a radio wave having a pulse width of 0.02 us indicated by a "black square" uses an inductor type waveform selection filter 21 that absorbs a long pulse and transmits a short pulse, but does not use the inductor type waveform selection filter 21. It is almost the same as the characteristics of. Therefore, according to the present embodiment, the inductor type waveform selection filter 21 can transmit a signal having a short pulse width and block a signal having a long pulse width without major deterioration. Therefore, by adjusting the inductor type waveform selection filter 21, it is possible to achieve the characteristics opposite to those shown in FIG. 5A.
Considering the results of FIGS. 5 (a) and 5 (b) comprehensively, it is basic to set an appropriate pulse width for each user and transmit only the signal of any user (user multiplexing). It became clear from the simulation study.

FIG. 11 shows a configuration example of the method (single frequency) by the pulse modulation method. The bit sequence generator generates a bit sequence to be transmitted, and the output sequence is input to a PPM (Pulse Position Modulation) modulator. In the PPM modulator, modulation is performed using the temporal position of the pulse according to the bit information, and a modulated signal is generated. In the original PPM modulation, the carrier signal (sine wave signal) is used as it is for modulation, but in the PPM modulation shown in FIG. 11, the sine wave signal generated by the carrier oscillator is used as a pulse time waveform controller. The excitation time is controlled by 10 so that the pulse width corresponds to the absorption characteristic of the waveform selection filter 20, and PPM modulation is performed using the output result. The modulated signal is transmitted to the receiving side through the wireless communication path. On the receiving side, it is first passed through the waveform selection filter 20, and then received through a pre-processed portion of wireless communication such as a front-end amplifier and bandpass filter. The received signal detector detects (demodulates) the received signal from the front-end output signal and outputs the received bit sequence. In FIG. 11, the front end and the received signal detector correspond to the receiving unit.

FIG. 12 shows the simulation results (in the case of a single frequency). The horizontal axis shows E _b / N ₀ , and the vertical axis shows the bit error rate characteristic (BER characteristic). It is shown that the result of FIG. 12 has the same tendency as the result of FIG. 5 described above.
That is, FIGS. 5 (a) and 12 (a) show the case of the capacitor type waveform selection filter 22 that absorbs radio waves having a short pulse width, and FIGS. 5 (b) and 12 (b) show the case of a long pulse width. This is the case of the inductor type waveform selection filter 21 that absorbs radio waves.
FIG. 12C shows the case of the parallel coupling type waveform selection filter 23 having a concave absorption characteristic. Compared to the BER characteristics (W / O SUT) without the parallel coupling type waveform selection filter 23 indicated by [X], the pulse width 2us indicated by "black circles" is hardly deteriorated, but is "black triangle". The pulse width of 20us shown and the pulse width of 0.02us shown by the "black square" are greatly deteriorated. That is, it absorbs radio waves with a small pulse width (0.02us) and radio waves with a large pulse width (20us), and transmits radio waves with a pulse width between them (2us).
FIG. 12D shows the case of the series-coupled waveform selection filter 24 having a convex absorption characteristic. For the BER characteristics (W / O SUT) without the series-coupled waveform selection filter 24 indicated by [X], the pulse width of 20us indicated by [black triangle] and the pulse width of 0.02us indicated by “black square” are Although it has hardly deteriorated, the pulse width 2us indicated by the "black circle" has deteriorated significantly. That is, a radio wave having a small pulse width (0.02us) and a radio wave having a large pulse width (20us) are transmitted, and a radio wave having a pulse width between them (2us) is absorbed.

FIG. 13 shows a configuration example of a method (plurality of frequencies) by OFDM (Orthogonal Frequency Division Multiplexing). The transmission bit data is serial-parallel converted by S / P and input to the QPSK modulator (4-phase phase shift keying modulator) in parallel. After that, the frequency domain signal is converted into a time domain signal by the IFFT section (inverse Fourier transformer), and a guard interval is added by the GI section. In D / A, the generated digital signal is converted into an analog signal, and the pulse width is appropriately controlled by adjusting the subcarrier with the Subcarrier Mapper.
As one of the specific embodiments, since the frequency interval of the subcarrier and the pulse width have a characteristic of being inversely proportional, the pulse width can be arbitrarily set by controlling the frequency interval of the subcarrier. The subcarrier Demapper on the receiving side performs the reverse operation to control the frequency interval of the subcarriers so as to correspond to an arbitrary pulse width.
The signal oscillated by the LO (local oscillator) is converted into a panda pass signal, and the frequency band is adjusted by the BPF (band filter) to generate a transmission signal. The transmission signal is input to the receiving unit after passing through a waveform selection filter via a wireless communication path as in the case of a single frequency. The receiving unit is realized by sequentially performing the processing of the transmitting unit in the reverse procedure.

FIG. 14 shows the principle of pulse time waveform control in the method by OFDM shown in FIG. From FIG. 14, it can be seen that the pulse width T of the time domain waveform of the OFDM signal is determined by the reciprocal of the subcarrier interval Δf. The subcarrier mapper of FIG. 13 controls the pulse width of the OFDM signal generated by adjusting this Δf, and generates an OFDM signal having a pulse width suitable for the waveform selection filter. This is intended for radio waves with pulse widths in the band where multiple frequencies exist.

FIG. 15 shows a simulation result (a band in which a plurality of frequencies exist). The horizontal axis shows E _b / N ₀ , and the vertical axis shows the bit error rate characteristic (BER characteristic). The result of FIG. 15 shows that the result has the same tendency as the result of FIGS. 5 and 12 described above.
That is, FIG. 15A shows the case of the capacitor type waveform selection filter 22 that absorbs radio waves having a short pulse width. The pulse width of 20us indicated by the “upper black triangle” is hardly deteriorated with respect to the BER characteristic (W / O SUT) without the capacitor type waveform selection filter 22 indicated by [X]. On the other hand, the pulse width of 1 us indicated by the "lower black triangle", the pulse width of 500 ns indicated by the "black circle", and the pulse width of 10 ns indicated by the "black square" are significantly deteriorated. That is, it absorbs radio waves with a short pulse width (1us, 500ns, 10ns) and transmits radio waves with a long pulse width (20us).
FIG. 15B shows the case of the inductor type waveform selection filter 21 that absorbs radio waves having a long pulse width. The pulse width of 10 ns indicated by the “black square” is hardly deteriorated with respect to the BER characteristic (W / O SUT) without the inductor type waveform selection filter 21 indicated by [X]. On the other hand, the pulse width of 20us indicated by the "upper black triangle", the pulse width of 1us indicated by the "lower black triangle", and the pulse width of 500ns indicated by the "black circle" are significantly deteriorated. That is, it transmits radio waves with a short pulse width (10 ns) and absorbs radio waves with a long pulse width (1 us, 500 ns, 20 ns).
FIG. 15C shows the case of the parallel coupling type waveform selection filter 23 having a concave absorption characteristic. Compared to the BER characteristics (W / O SUT) without the parallel coupling type waveform selection filter 23 indicated by [X], the pulse width 1us indicated by the “lower black triangle” and the pulse width 500ns indicated by the “black circle” are almost the same. Although it has not deteriorated, the pulse width of 1 ns indicated by the “black square” and the pulse width of 20 uss indicated by the “upper black triangle” are significantly deteriorated. That is, it absorbs radio waves with a small pulse width (10 ns) and radio waves with a large pulse width (20 us), and transmits radio waves with a pulse width between them (1 us, 500 ns).
FIG. 15D shows the case of the series-coupled waveform selection filter 24 having a convex absorption characteristic. For the BER characteristics (W / O SUT) without the series-coupled waveform selection filter 24 indicated by [X], the pulse width of 20us indicated by [black triangle] and the pulse width of 0.02us indicated by “black square” are Although it has hardly deteriorated, the pulse width 2us indicated by the "black circle" has deteriorated significantly. That is, a radio wave (10 ns) having a small pulse width and a radio wave (20 us) having a large pulse width are transmitted, and a radio wave (1 us, 500 ns) having a pulse width between them is absorbed.
From the above, the waveform selection filter 20 can selectively absorb and transmit radio waves having a pulse width in a band in which a plurality of frequencies exist, according to the pulse width.

(First Embodiment)
FIG. 16 shows a multiplexing method (transmitting side) using the waveform selection filter of the first embodiment.
The transmitting side communication terminal 2 has a pulse time waveform controller 10 following the modulator 12. The bit information input by the communication terminal is modulated by the modulator 12. The generated modulated signal is subsequently input to the pulse time waveform controller 10, and waveform control in the time domain is performed in which the generated modulated signal is transformed into a radio wave having a unique pulse width assigned to each pair of transmitters and receivers. After that, the radio wave is transmitted to the multiple access communication path 30.

FIG. 17 shows a multiplexing method (reception side) using the waveform selection filter of the first embodiment.
It is assumed that the receiving side communication terminal 2 receives the radio wave passing through the multiple access communication path 30 by the waveform selection filter 20. The waveform selection filter 20 transmits radio waves having a specific pulse width and absorbs other radio waves. Therefore, only the radio wave having a unique pulse width assigned to the transmitter / receiver is transmitted by the waveform selection filter 20, and the radio wave having a specific pulse width is selectively received by the antenna 6. After that, the received radio wave is demodulated by being input to the demodulator 16, and the received bit information for a specific sender is obtained. In FIG. 17, the demodulator 16 corresponds to the receiving unit.

FIG. 6 schematically shows a configuration of a communication system 1 that performs multiplexing by a waveform selection filter in the same frequency band or a band in which a plurality of frequencies exist. In this communication system 1, a radio channel having the same frequency band or a band in which a plurality of frequencies exist by assigning a unique pulse width to each of N sets of sender and receiver (hereinafter, transmitter / receiver) pairs. Achieves multiplexing in. Taking a pair of sender # 1 and receiver # 1 as an example, sender # 1 communicates with receiver # 1 on a radio wave having a specific unique pulse width. Similarly, senders # 1, 2, 3, ..., N communicate with paired receivers # 1, 2, 3, ..., N with different specific pulse widths.
The transmitting side communication terminal has a modulator 12, followed by a pulse time waveform controller 10, and then an antenna 6. The bit information input by the communication terminal is modulated by the modulator 12. The generated modulated signal is subsequently input to the pulse time waveform controller 10, and waveform control in the time domain is performed in which the generated modulated signal is transformed into a radio wave having a unique pulse width assigned to each pair of transmitters and receivers. After that, the radio wave is transmitted to the multiple access communication path 30 by the antenna 6.
The multiple access communication path 30 is a normal wireless communication space (wireless communication path), and is multiplely accessed by a plurality of radio waves.
It is assumed that the receiving side communication terminal first receives the radio wave passing through the multiple access communication path 30 by the antenna 6 having the waveform selection filter 20. The waveform selection filter 20 transmits radio waves having a specific pulse width and absorbs other radio waves. Therefore, only the radio wave having a unique pulse width assigned to the transmitter / receiver is transmitted by the waveform selection filter 20, and the radio wave having a specific pulse width is selectively received by the antenna 6. After that, the received radio wave is demodulated by being input to the demodulator 16, and the received bit information for a specific sender is obtained. In FIG. 6, the antenna 6 and the demodulator 16 correspond to the receiving unit.
Here, the pulse time waveform controller 10 is configured to control the pulse width of the modulated signal output from the pulse modulator 12, and has a function of waveform control in the time domain. As the definition of the pulse time, in the case of a single frequency signal (sine wave signal), the "excitation time of the sine wave signal" is defined as the "pulse width". Therefore, it can be realized by a simple control mechanism of the pulse width, and the pulse time waveform controller can be configured by a switch or a simple digital circuit element. On the other hand, the pulse width of a signal having a certain frequency bandwidth (a signal expressed by a combination of a plurality of sinusoidal signals) is also defined by "the duration of existence of a signal above a certain signal strength". .. A simple modulation method can be realized by a control mechanism using a switch or a simple digital circuit element, but it is difficult to realize it by a simple mechanism such as a switch in OFDM modulation as described later.
As described above, according to the first embodiment, in the conventional communication system, the same frequency band or a plurality of frequencies exist by installing the pulse time waveform controller 10 on the transmitting side and the waveform selection filter 20 on the transmitting side. It is possible to provide a communication system 1 multiplexed by selecting a waveform according to a pulse width in a band.

(Second Embodiment)
FIG. 18 shows a method (transmission side) in which frequency division multiple access (FDMA) is introduced into multiplexing by a waveform selection filter.
The transmitting side communication terminal 2 has a frequency converter 14 (transmitting side frequency converter) following the modulator 12, followed by a pulse time waveform controller 10.
The bit information input by the communication terminal 2 is modulated by the modulator 12 and subsequently converted into a signal on the frequency band assigned by the frequency converter 14. Subsequently, the pulse time waveform controller 10 converts the radio wave into a radio wave having a specific pulse width assigned. The generated radio wave is transmitted to the multiple access communication path 30.
Here, the frequency converter 14 performs multiplexing in the frequency domain by frequency division multiple access (FDMA). In addition, the pulse time waveform controller 10 performs multiplexing by selecting a waveform based on the pulse width.

FIG. 19 shows a method (reception side) in which FDMA is introduced into multiplexing by a waveform selection filter.
The receiving side communication terminal 2 first receives the radio wave passing through the multiple access communication path 30 by the waveform selection filter 20. The waveform selection filter 20 transmits radio waves having a specific pulse width assigned to each transmission / reception pair, and absorbs other radio waves. This part realizes selective reception of radio waves with the assigned pulse width. In FIG. 19, the frequency converter 14 and the demodulator 16 correspond to the receiving unit.

FIG. 7 schematically shows a configuration example of a communication system 1 in which a multiplexing method in a frequency domain by frequency division multiple access (FDMA) and a multiplexing method by waveform selection are combined. In this configuration example, N pairs of transmitters and receivers are two-dimensionally multiplexed in the frequency domain and the pulse width domain. Taking a pair of sender # 1 and receiver # 1 as an example, sender # 1 is assigned a specific frequency band and a specific pulse width to communicate with sender # 1. Similarly, the senders # 1, 2, 3, ..., N communicate with the paired receivers # 1, 2, 3, ..., N by assigning their respective specific frequency bands and pulse widths.
The transmitting side communication terminal 2 has a frequency converter 14 (reception side frequency converter) following the modulator 12, a pulse time waveform controller 10, and then an antenna 6.
The bit information is modulated by the modulator 12 and subsequently converted into a signal on the frequency band assigned by the frequency converter 14. Subsequently, the pulse time waveform controller 10 converts the radio wave into a radio wave having a specific pulse width assigned. The generated radio wave is transmitted to the multiplex access communication path 30 by the antenna 6.
Here, the frequency converter 14 performs multiplexing in the frequency domain by frequency division multiple access (FDMA). In addition, the pulse time waveform controller 10 performs multiplexing by selecting a waveform based on the pulse width.
The multiple access communication path 30 is a normal wireless communication space, and is a channel through which a plurality of radio waves are multiplely accessed.
It is assumed that the receiving side communication terminal first receives the radio wave passing through the multiple access communication path 30 by the antenna 6 having the waveform selection filter 20. The waveform selection filter 20 transmits radio waves having a specific pulse width assigned to each transmission / reception pair, and absorbs other radio waves. This part realizes selective reception of radio waves with the assigned pulse width. Further, the signal received by the antenna 6 is converted by the frequency converter 14 to selectively receive only a specific frequency region. Only the radio signals selectively extracted in the frequency domain and the pulse width domain are input to the demodulator 16, and the received bit information for a specific sender is output. In FIG. 7, the antenna 6, the frequency converter 14, and the demodulator 16 correspond to the receiving unit.
As described above, according to the second embodiment, in the conventional FDMA system (frequency division multiple access system) communication system, the pulse time waveform controller 10 is installed on the transmission side and the waveform selection filter 20 is installed on the transmission side. It is possible to provide a multiplexed communication system 1 by selecting a waveform based on a pulse width in the same frequency band or a band in which a plurality of frequencies exist.

(Third Embodiment)
FIG. 20 shows a configuration example of a method (transmitting side) in which TDMA is introduced for multiplexing by a waveform selection filter.
The transmitting side communication terminal 2 has an access time controller 17 (transmitting side access time controller, followed by pulse time waveform controller 10) following the modulator 12.
The bit information input by the communication terminal 2 is modulated by the modulator 12 and subsequently converted into a signal on the frequency band assigned by the access time controller 17. Subsequently, the pulse time waveform controller 10 converts the radio wave into a radio wave having a specific pulse width assigned. The generated radio wave is transmitted to the multiple access communication path 30.
Here, the access time controller 17 performs multiplexing by access time by time division multiple access (TDMA). In addition, the pulse time waveform controller 10 also realizes multiplexing by waveform selection based on the pulse width.

FIG. 21 shows a configuration example of a method (reception side) in which TDMA is introduced for multiplexing by a waveform selection filter.
The receiving side communication terminal 2 first receives the radio wave passing through the multiple access communication path 30 by the waveform selection filter 20. The waveform selection filter 20 transmits radio waves having a specific pulse width assigned to each transmission / reception pair, and absorbs other radio waves. This part realizes selective reception of radio waves with the assigned pulse width.
Subsequently, the access time controller 17 (reception side access time controller) extracts a signal of a specific access time corresponding to each user. Subsequently, the demodulator 16 demodulates the received signal and outputs the received bit sequence. In FIG. 21, the access time controller 17 and the demodulator 16 correspond to the receiving unit.

(Fourth Embodiment)
FIG. 22 shows a configuration example of a method (transmission side) in which CDMA (code division multiple access method) is introduced for multiplexing by a waveform selection filter.
The transmitting side communication terminal 2 has a modulator 12 followed by a code diffuser 18, followed by a pulse time waveform controller 10.
The bit information input by the communication terminal 2 is modulated by the modulator 12, and then the code spreader 18 performs signal spreading using the spreading code corresponding to each user. Subsequently, the pulse time waveform controller 10 converts the radio wave into a radio wave having a specific pulse width assigned. The generated radio wave is transmitted to the multiple access communication path 30.
Here, the code spreader 18 performs multiplexing in the spread code region by code division multiple access (CDMA). In addition, the pulse time waveform controller 10 performs multiplexing by selecting a waveform based on the pulse width.

FIG. 23 shows a configuration example of a method (transmitting side, another form) in which CDMA is introduced for multiplexing by a waveform selection filter. In FIG. 23, the direct sequence spread spectrum (DSSS system) is taken as an example.
The transmitting side communication terminal 2 has a code spreader 18 following the modulator 12. Further, in parallel with this, a CDMA diffusion code generator 18-1 is provided, followed by a pulse time waveform controller 10 (chip rate adjuster), and then a code diffuser 18. The generator 18-1 outputs a spreading code corresponding to each user, and the spreading signal is generated by passing the spreading code through 10. The pulse time waveform controller 10 controls the pulse width of the transmission signal so that the signal is selectively transmitted / absorbed by the waveform selection filter by adjusting the chip rate of the diffusion signal. That is, one chip width (the reciprocal of the chip rate) is regarded as a pulse width, and the effect of waveform selectivity is obtained by controlling this chip width.
The radio wave generated by the code spreader 18 is transmitted to the multiple access communication path 30.

FIG. 24 shows a method (reception side) in which CDMA is introduced for multiplexing by waveform selectivity.
The receiving side communication terminal 2 first receives the radio wave passing through the multiple access communication path 30 by the waveform selection filter 20. The waveform selection filter 20 transmits radio waves having a specific pulse width assigned to each transmission / reception pair, and absorbs other radio waves. This part realizes selective reception of radio waves with the assigned pulse width.
Subsequently, the code despreader 19 performs dediffusion using the spread signal corresponding to each user, and extracts the received signal of each user.
Subsequently, the demodulator 16 demodulates the received signal and outputs the received bit sequence. In FIG. 24, the code despreader 19 and the demodulator 16 correspond to the receiving unit.

(Fifth Embodiment)
FIG. 8 shows an example in which the pulse time waveform controller 10 and the waveform selection filter 20 are attached to the communication terminal 2. The communication terminal 2 has an antenna 6 and a board 2a in the communication terminal. Since the pulse time waveform controller 10 has few components, it is mounted on a part of the substrate 2a in the communication terminal 2. Further, the waveform selection filter 20 is mounted on the outside of the antenna 6. The communication terminal 2 can be used as the above-mentioned receiving side communication terminal and transmitting side communication terminal. Here, the waveform selection filter 20 is a transmissive type.
On the other side, in the communication terminal 2 on the transmitting side, the continuous signal generated by the modulator 12 and the frequency converter 14 mounted on the board 2a in the communication terminal is transmitted by the pulse time waveform controller 10 to a specific specific pulse width. The waveform is controlled in the time domain so as to be the signal of, and is transmitted as an electric signal to the antenna 6 via the wiring 2b in the communication terminal. This electric signal is changed into a radio wave by the antenna 6 and transmitted to the multiple access communication path 30 (space). On the other side, the communication terminal 2 on the receiving side first transmits radio waves having a specific pulse width by the waveform selection filter 20, and absorbs other radio waves. Subsequently, the antenna 6 selectively receives only radio waves having a specific pulse width, and transmits the received signals to the frequency converter 14 and the demodulator 16 mounted on the board 2a in the communication terminal.
Here, although the example in which the waveform selection filter 20 is attached to the outside of the antenna 6 built in the communication terminal 2 is shown, it may be installed in the communication terminal 2. That is, the waveform selection filter 20 is connected to the antenna 6 via a so-called electromagnetic wave and is integrally configured as a communication function. Therefore, the pulse time waveform controller 10 and the waveform selection filter 20 do not need to be mechanically fastened directly to the antenna 6. This is because the pulse time waveform controller 10 and the waveform selection filter 20 may have the antenna 6 fixed to the outer shell of the communication terminal 2.
According to the third embodiment, by integrally configuring the antenna 6 of the conventional communication terminal with the waveform selection filter 20 as a communication function via a so-called electromagnetic wave, a pulse is generated in the same frequency band or a band in which a plurality of frequencies exist. It is possible to provide a multiplexed communication terminal 2 by selecting a waveform according to a width.

FIG. 25 shows the effect of multiplexing by the waveform selection filter 20 from the viewpoint of channel capacity. The horizontal axis shows the SNR (signal-to-noise ratio) and the vertical axis shows the channel capacity (theoretical limit value of the communication speed) of each user. As a comparison method, FIG. 25 also shows the result of the conventional method using only FDMA (displayed in "black rhombus"). The description of the percentage of the waveform selection filter 20 indicates the signal residual rate of unnecessary radio waves by the waveform selection filter. For example, "1%" is excluded (unnecessary), the attenuation rate of the pulse width signal is 99%, and the rest. It shows that 1% of the radio waves are transmitted. Here, the number of users is set to 100. When the SNR increases (when the communication condition becomes good), the channel capacity increases, but it is shown that the channel capacity of each user increases due to multiplexing by the waveform selection filter regardless of which SNR is set. ing. Further, the absorption rate of unnecessary radio waves has a great influence on the communication path capacity of each user, that is, the unnecessary radio waves that cannot be completely absorbed interfere with the necessary radio waves and cause deterioration of the communication path capacity. Therefore, since unnecessary radio waves can be efficiently absorbed, the channel capacity can be significantly increased. For example, when the SNR is 20 dB, an increase in the channel capacity (frequency utilization efficiency) of about 10 times was confirmed. That is, the channel capacity has increased from 6 Mbits / s for the "black rhombus" to 57.56 Mbits / s for the "black square" when the signal absorption rate is 0.1%.

FIG. 26 shows the effect of multiplexing by the waveform selection filter 20 from the viewpoint of the number of users. Since the frequency band of all user signals is fixed, the communication path capacity of each user decreases as the number of accommodated users increases. On the other hand, it has been shown that the channel capacity of each user increases by performing multiplexing with a waveform selection filter regardless of the number of users. Further, when trying to secure a channel capacity of 30 Mbps for each user, the conventional FDMA method (displayed in "black rhombus") can accommodate only 10 users, whereas the method using a waveform selection filter (signal absorption rate 0. It is suggested that the number of accommodated users can be increased up to 100 users (indicated by a "black square" at 1% or a "black circle" at 1%).

FIG. 9 shows an example of assumed use (example of a wireless LAN network) of the multiple access method by the waveform selection filter 20.
FIG. 9A shows a conventional example. Interference is avoided by assigning three different frequencies f1, f2, and f3 (3 channels) to each of the three users. It should be noted that interference occurs at the same frequency (same channel). That is, the number of frequencies required for the number of users. For example, a user using frequency f2 is using a PC 400 and a repeater 800.
FIG. 9B shows an embodiment. By assigning three different pulse widths to each of the three frequencies, it is possible to avoid interference at the same frequency (channel). By using 3 frequencies and 3 pulse widths, it is shown that 9 users can use it. For example, when frequency f2 is used, three users can use PC4a, PC4b, and PC4c by using pulse widths of three different lengths. In this case, the pulse time waveform controller 10 and the waveform selection filter 20 are mounted on the PC4a, PC4b, PC4c, and repeater 8, respectively.
Therefore, by using the pulse width, the frequency utilization efficiency is dramatically improved.

As described above, according to the embodiment, the concept of pulse width selectivity (waveform axis) is introduced into the three axes of frequency, time, and code in the conventional communication system, and the pulse width is used in the same frequency band or a band in which a plurality of frequencies exist. Provided are a multiplexed communication system 1 and a communication terminal 2 (for example, a mobile terminal) using a waveform selection filter 20 that selects a waveform.
The first invention is a transmitting side communication terminal 2 that controls a pulse width, which is an excitation time of a radio wave, to a specific pulse width to transmit a radio wave, and a receiving side communication terminal 2 that receives a radio wave transmitted by the transmitting side communication terminal 2. a waveform selection filter 20 includes a receiving-side communication terminal 2 includes a reception unit, a waveform selection filter 20 selectively transmits or reflects the radio waves of a specific pulse width, receiver, waveform This is a communication system that receives radio waves having a specific pulse width transmitted by the selection filter 20.
According to the first invention, a transmitting side communication terminal 2 that controls a pulse width, which is an excitation time of a radio wave, to a specific pulse width to transmit a radio wave, and a receiving side communication terminal that receives a radio wave transmitted by the transmitting side communication terminal 2. 2, the waveform selection filter 20 includes a receiving-side communication terminal 2 includes a reception unit, a waveform selection filter 20 selectively transmits or reflects the radio waves of a specific pulse width, receiver It is possible to provide a multiplexed communication system 1 that receives radio waves having a specific pulse width transmitted by the waveform selection filter 20. That is, it is characterized in that a specific pulse width is selectively received on the receiving side.
Invention 2, the waveform selection filter 20, and Rukoto characterized the intervention between the transmitting-side communication terminal 2 and the reception side communication terminal 2.
According to the second invention, the waveform selection filter 20 is characterized in that the waveform selection filter 20 is interposed between the transmitting side communication terminal 2 and the receiving side communication terminal 2 and selectively receives a specific pulse width on the receiving side .
According to the third invention, the waveform selection filter 20 includes a conductive member 25, a rectifying circuit connecting two places of the conductive member 25, and one or both of an RL circuit and an RC circuit, and the RL circuit has an inductive component. The RC circuit has a circuit element having a circuit element and a circuit element having a resistance component, the RC circuit has a circuit element having a capacity component and a circuit element having a resistance component, and the waveform selection filter 20 has a pulse width which is an excitation time of a radio wave. radio wave absorption rate is characterized by different of Rukoto by.
According to the invention 3, it identifies the specific configuration of the waveform selecting filter 20.
According to the fourth aspect of the present invention, the transmitting side communication terminal 2 includes a pulse time waveform controller 10 that controls the pulse width of radio waves to a specific pulse width, and a transmitting side frequency converter 14 that performs multiplexing in the frequency domain. The radio wave transmitted by the transmitting side communication terminal 2 is controlled to a specific pulse width by the pulse time waveform controller 10, and is multiplexed in the frequency domain by the transmitting side frequency converter 14, and is received. The side communication terminal 2 is characterized by having a receiving side frequency converter 14 that selectively receives a signal in a specific frequency domain among radio waves having a specific pulse width transmitted by the waveform selection filter 20.
According to the fourth invention, in the frequency division FDMA communication system, the frequency converter 14 and the pulse time waveform controller 10 are installed on the transmitting side, and the waveform selection filter 20 and the frequency converter 14 are installed on the receiving side. It is possible to provide a multiplexed communication system by selecting a waveform based on a pulse width.
In the fifth invention, the transmitting side communication terminal 2 includes a pulse time waveform controller 10 that controls the pulse width of radio waves to a specific pulse width, and a transmitting side access time controller 17 that performs multiplexing with access time. However, the radio wave transmitted by the transmitting side communication terminal 2 is controlled to a specific pulse width by the pulse time waveform controller 10, and is multiplexed by the access time by the transmitting side access time controller 17. The receiving-side communication terminal 2 is characterized by having a receiving-side access time controller 17 that selectively receives a signal having a specific access time among radio waves having a specific pulse width transmitted by the waveform selection filter 20. ..
According to the fifth invention, in a time-divided TDMA communication system, an access time controller 17 and a pulse time waveform controller 10 are installed on the transmitting side, a waveform selection filter 20 and an access time controller 17 are installed on the receiving side. Therefore, it is possible to provide a multiplexed communication system by selecting a waveform based on a pulse width.
In the sixth invention, the transmitting side communication terminal 2 has a pulse time waveform controller 10 that controls the pulse width of a radio wave to a specific pulse width, and a code spreader 18 that performs multiplexing in a spreading code region. The radio wave transmitted by the transmitting side communication terminal 2 is controlled to a specific pulse width by the pulse time waveform controller 10, and is multiplexed in the spreading code region by the code spreader 18, so that the receiving side communication terminal 2, out of the radio wave of a particular pulse width waveform selection filter 20 is transmitted, characterized in that it has a code despreader 19 that selectively receives a signal signal spread with a specific spreading code.
According to Invention 6, in a CDMA communication system that is code division, a code spreader 18 and a pulse time waveform controller 10 are installed on the transmitting side, a waveform selection filter 20 and a code despreading 19 are installed on the receiving side. , It is possible to provide a multiplexed communication system by selecting a waveform according to a pulse width.
INDUSTRIAL APPLICABILITY 7 is a receiving side communication terminal 2 for receiving radio waves from a transmitting side communication terminal 2 for transmitting radio waves by controlling a pulse width which is an excitation time of radio waves to a specific pulse width, and a waveform selection filter 20 and a waveform selection filter 20. A receiving side communication terminal having a receiving unit, the waveform selection filter 20 selectively transmitting radio waves having a specific pulse width, and the receiving unit receiving radio waves having a specific pulse width transmitted through the waveform selection filter 20. Ru 2 der.
According to the seventh invention, it is possible to provide a receiving side communication terminal 2 equipped with a waveform selection filter 20.
Invention 8, you comprising the pulse time waveform controller 10 for controlling the pulse width is a radio wave excitation time to send.
According to the eighth invention, it is possible to provide a receiving side communication terminal 2 having both a transmitting function and a receiving function.
The ninth invention is a transmitting side communication terminal 2 for transmitting a radio wave to a receiving side communication terminal 2 that selectively receives a radio wave having a pulse width having a specific pulse width, which is an excitation time of the radio wave, and is a radio wave pulse. This is a transmitting side communication terminal 2 that transmits radio waves by controlling the width to a specific pulse width.
According to the ninth aspect of the present invention, it is possible to provide a transmitting side communication terminal 2 that transmits radio waves by controlling the pulse width of radio waves to a specific pulse width.
As described above, the communication system 1 and the communication terminal 2 of the present invention can realize the frequency utilization efficiency exceeding the limit of the conventional communication theory and can dramatically expand the depleting radio frequency resources.

1 Communication system 2 Communication terminal 2a Communication terminal board 2b Communication terminal wiring 4 PC
6 Antenna 8 Repeater 10 Pulse time waveform controller 12 Modulator 14 Frequency converter 16 Demodulator 17 Access time controller 18 Code diffuser 18-1 CDMA diffusion code generator 19 Code despreader 20 Waveform selection filter (waveform selection) Metasurface)
21 Inductor type waveform selection filter (radio wave absorption with long pulse width)
22 Capacitor type waveform selection filter (short pulse width radio wave absorption)
23 Parallel coupling type waveform selection filter (concave absorption characteristics)
24-series coupled waveform selection filter (convex absorption characteristics)
25 Conductive member 26 Dielectric 27 Metal plate 30 Multiple access communication path 50 Simulation environment 51 Transmission unit 511 Pulse generation unit 52 Channel unit 53 Reception unit 531 Comparator 532 Symbol timing unit U User

Claims (6)

A transmitting side communication terminal that transmits the radio wave by controlling the pulse width, which is the excitation time of the radio wave, to a specific pulse width, a receiving side communication terminal that receives the radio wave transmitted by the transmitting side communication terminal, and a waveform selection filter. When, wherein the receiving communication terminal includes a receiving unit, the waveform selection filter selectively transmits or reflects the radio waves of the specific pulse width, wherein the receiving unit, the waveform selection A communication system that receives the radio waves of the specific pulse width transmitted through the filter. The waveform selection filter, a communication system according to claim 1, characterized in Rukoto the intervention between the transmitting-side communication terminal the reception side communication terminal. The waveform selection filter includes a conductive member and a rectifier circuit that connects two points of the conductive member.
The RL circuit includes one or both of an RL circuit and an RC circuit, the RL circuit has a circuit element having an inductive component and a circuit element having a resistance component, and the RC circuit has a circuit element and a resistor having a capacity component. It includes a circuit element having a component, the waveform selection filter, a communication system according to claim 1 or 2 radio wave absorptance by the pulse width which is wave excitation time is characterized by different of Rukoto. The transmitting side communication terminal has a pulse time waveform controller that controls the pulse width of the radio wave to the specific pulse width, and a transmitting side frequency converter that performs multiplexing in the frequency domain, and has the transmitting side. The radio wave transmitted by the communication terminal is controlled to the specific pulse width by the pulse time waveform controller, and is multiplexed in the frequency domain by the transmitting side frequency converter, and the receiving side. The communication terminal has a receiving side frequency converter that selectively receives a signal in a specific frequency domain from the radio waves having the specific pulse width transmitted by the waveform selection filter . The communication system according to any one of 3. The transmitting side communication terminal has a pulse time waveform controller that controls the pulse width of the radio wave to the specific pulse width, and a transmitting side access time controller that performs multiplexing by the access time.
The radio wave transmitted by the transmitting side communication terminal is controlled to the specific pulse width by the pulse time waveform controller, and is multiplexed by the access time by the transmitting side access time controller. ,
The receiving side communication terminal is characterized by having a receiving side access time controller that selectively receives a signal having a specific access time from the radio waves having the specific pulse width transmitted through the waveform selection filter. The communication system according to any one of claims 1 to 3. The transmitting side communication terminal has a pulse time waveform controller that controls the pulse width of the radio wave to the specific pulse width, and a code spreader that performs multiplexing in a spreading code region, and the transmitting side communication. The radio wave transmitted by the terminal is controlled to the specific pulse width by the pulse time waveform controller, and is multiplexed in the diffusion code region by the code spreader, and the receiving side communication terminal 1 is characterized by having a code despreader that selectively receives a signal diffused by a specific diffusion code among the radio waves having the specific pulse width transmitted by the waveform selection filter. The communication system according to any one of 3 to 3 .

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