JP3680595B2 - Identification device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an identification apparatus for estimating a transmitting station from a received signal in a transmission system using a plurality of carriers, and particularly in a single frequency network in which a transmitting station transmits the same content from a plurality of points.
[0002]
[Prior art]
Conventionally, there are few mentions of the configuration of the identification device, and the configuration of the signal on the transmission side is generally considered to have the following structure.
[0003]
FIG. 12 is a conceptual diagram showing a conventional transmission form of transmitting station information using a plurality of carriers.
In FIG. 12, (a) shows the state of each subcarrier during a certain transmission time when transmission using a plurality of carriers is performed. (B) shows the state of information assigned to a certain transmitting station in the state of (a). Only the carrier wave at the position indicated by the solid line is transmitted, and no signal is transmitted at the dotted line position. Assuming that all subcarriers are n, only m of them are transmitted, so that _n C _m transmitting stations are distinguished. However, when the correlation is taken on the receiving side, if m is too large, the difference between the correlation values cannot be taken so large that it becomes difficult to identify, so normally m is not set to a very large number. It is an object of the identification apparatus to distinguish and determine m identification signals allocated in this way on the receiving side.
[0004]
FIG. 13 shows the structure of a conventional general identification device. Identification symbol extraction means 101 for extracting a transmission symbol including a transmission station identification signal from received signal 110, and subcarrier information from the symbol. Sub-carrier extraction means 102 for extracting data, transmission source information storage means 106 for storing transmission source information in advance, correlation calculation means 103 for calculating correlation from the transmission source information and the position of the extracted sub-carrier, calculation It comprises a maximum value detecting means 104 for detecting the maximum one from the correlation values and a transmission source determining means 105 for determining a transmitting station transmitted from the calculated maximum value.
[0005]
[Problems to be solved by the invention]
In general, when transmission using a single frequency network is performed, identification of a transmitting station is performed, so that it can be effectively used for control of a receiver and estimation of a reception position. Therefore, the identification device is required to identify the transmission station with certainty.
[0006]
It is an object of the present invention to reliably identify a transmitting station even in a noisy environment or a large fluctuation in a transmission path.
[0007]
[Means for Solving the Problems]
In order to solve this problem, the present invention has a configuration in which a plurality of transmitting stations have different identification information, the identification information is identified by a combination of a plurality of carriers, and the transmitted carriers are paired next to each other. In this case, an adjacent carrier pair calculating means for calculating in advance with adjacent carrier pairs of the received subcarrier group is provided, and then the correlation is calculated.
[0008]
As a result, it is possible to reliably identify the transmitting station even in a noisy environment or when the transmission path varies greatly.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 is a system intended to perform transmission using a plurality of carriers, and when a transmission system is configured with a single frequency network, a plurality of transmitting stations have different identification information. When the identification information is identified by a combination of a plurality of carriers and the transmitted adjacent carriers are the same signal, a means for extracting a symbol to be identified and a subcarrier that is a representation of the identification symbol on the frequency axis Source information storage for holding a combination of a decomposing means, an adjacent carrier pair calculating means for multiplying power between adjacent subcarriers of the decomposed subcarrier group, and a subcarrier of the transmitting station known in advance Means for calculating a correlation for the combination of the transmission source information and the calculation result of the adjacent carrier pair, a maximum value detecting means for extracting a maximum value from the calculated correlation values, And a configuration identification device to consist of a determined sender evaluating means the source from the maximum value, by effectively utilizing the condition that subcarriers adjacent are the same signal, even during the reception in adverse conditions The transmitter station can be reliably identified , and unnecessary subcarriers can be removed by power multiplication of each pair of adjacent carriers.
[0012]
The invention according to claim 2 is a system intended to perform transmission using a plurality of carriers, and when a transmission system is configured with a single frequency network, a plurality of transmitting stations have different identification information. When the identification information is identified by a combination of a plurality of carriers and the transmitted adjacent carriers are the same signal, a means for extracting a symbol to be identified and a subcarrier that is a representation of the identification symbol on the frequency axis Decomposing means, adjacent carrier pair calculating means for performing vector correlation between adjacent subcarriers of the decomposed subcarrier group, and transmission source information storage means for holding a combination of subcarriers of a transmitting station known in advance Means for calculating a correlation for the combination of the transmission source information and the calculation result of the adjacent carrier pair, a maximum value detecting means for extracting a maximum one from the calculated correlation values, and extraction A configuration identification device to consist of a determined sender evaluating means the source from the maximum value, by effectively utilizing the condition that subcarriers adjacent are the same signal, during reception in adverse conditions Also, the transmission station can be reliably identified, and the vector correlation calculation of the adjacent carrier wave has an effect of being strong against noise and unnecessary carrier signal.
[0013]
Also, as in the invention of claim 3, means for calculating the correlation, even as the identification device according scalar correlation line cormorants請 Motomeko 2 After computing the vector power of each subcarrier, a similar Has an effect.
[0014]
It is preferable as defined in claim 4, means for calculating the correlation, even as the identification device according to calculations of vector power to the line power sale請 Motomeko 2 after the vector addition, the same effect Present.
[0015]
Invention of claim 5, a receiving device having an identification device according to any one of claims 1 to 4, taking advantage of the identification device according to any one of claims 1 to 4, the receiving state It has the effect that a receiving device with improved can be obtained.
[0016]
The invention according to claim 6 is a transmission / reception system having the identification device according to any one of claims 1 to 4 , and has a reliability utilizing the advantages of the identification device according to any one of claims 1 to 4 . A high system can be constructed.
[0017]
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
(Embodiment 1)
FIG. 1 is a block diagram showing a basic configuration of an identification apparatus according to the present embodiment. In FIG. 1, reference numeral 101 denotes identification symbol extraction for extracting a transmission symbol containing a transmission station identification signal from received signal 110. Means 102, subcarrier extraction means for extracting subcarrier information from the symbol, 106, transmission source information storage means for storing transmission source information in advance, and 103, position of transmission source information and extracted subcarriers Correlation calculation means for calculating the correlation from, 104 is a maximum value detection means for detecting the maximum one from the calculated correlation values, and 105 is a transmission source determination means for determining the transmission station transmitted from the calculated maximum value , 102 is subjected to pre-calculation processing by the adjacent carrier pair processing means 120, thereby improving resistance to disturbance on the transmission path.
[0018]
FIG. 2 schematically shows the state of the subcarrier at that time.
(A) is an example of an effective transmission subcarrier for general transmission station identification. (B) is an example of a transmission subcarrier of the transmission station identification information, and the transmission subcarrier is characterized in that it exists in a pair with an adjacent subcarrier. The identification information transmitted in this way is observed as a subcarrier by 101 and 102 on the receiving side. Here, since the position of the subcarrier pair is known in advance, it is possible to perform arithmetic processing with the -pair. Therefore, the maximum value is detected and the transmission station is determined by performing correlation calculation with the transmission station source information stored in advance for those appropriately processed by 120.
[0019]
According to the present embodiment, it is possible to effectively use the condition that adjacent subcarriers are the same signal, and to reliably identify the transmitting station even when receiving under bad conditions.
[0020]
(Embodiment 2)
FIG. 3 shows a first configuration in the vicinity of the adjacent carrier pair processing means of the identification device according to the present embodiment, corresponding to the input from the adjacent carrier pair processing means 120 to the output of the correlation calculation means 103 in FIG. In FIG. 3, 112 is an extracted subcarrier input, 121 is a means for calculating the power of each subcarrier, 122 is a means for adding power as a subcarrier pair, and 124 is a storage means for storing source information as a subcarrier pair. , 123 is a means for calculating the scalar correlation without the presence of the subcarrier pair power and the transmission source information calculated by 122 based on the transmission source information stored as the subcarrier pair, and 113 is the result of the scalar correlation. Since the correlation value is calculated as the sum between adjacent subcarriers in the processing unit of the subcarrier pair configured as described above, the tolerance to disturbance is improved as compared with the case of a single subcarrier.
[0021]
(Embodiment 3)
FIG. 4 shows a second configuration in the vicinity of the adjacent carrier pair processing means of the identification apparatus according to the present embodiment, corresponding to the input from the adjacent carrier pair processing means 120 to the output of the correlation calculation means 103 in FIG. 4, most of the components are the same as those shown in FIG. 3, but are characterized in that a subcarrier pair multiplication unit 125 is provided instead of the subcarrier pair addition unit 122.
[0022]
FIG. 5 is a diagram showing a concept of processing by the configuration of FIG. Since the correlation value is calculated as a product between adjacent subcarriers by configuring the processing unit of the subcarrier pair as shown in FIG. 4, an unnecessary signal jumping in due to an external factor as shown in FIG. In addition, it is possible to improve resistance to unnecessary signals generated inside.
[0023]
(Embodiment 4)
FIG. 6 shows a third configuration in the vicinity of the adjacent carrier pair processing means of the identification device according to the present embodiment, corresponding to the input from the adjacent carrier pair processing means 120 to the output of the correlation calculation means 103 in FIG. 6, most of the components are the same as those shown in FIG. 3, but instead of the subcarrier power calculation means 121 and the subcarrier pair addition means 122, the subcarrier pair vector correlation calculation means 126 and the vector power calculation means. The feature is that 127 is provided.
[0024]
FIG. 7 is a diagram showing a concept of processing by the configuration of FIG. Since the correlation value is calculated as a vector correlation between adjacent subcarriers by configuring the processing unit of the subcarrier pair as shown in FIG. 6, it is unnecessary to jump in due to external factors as shown in FIG. It is possible to improve resistance to signals and unnecessary signals generated inside.
[0025]
Also, such a configuration, as compared with (Embodiment 3), is not only a scalar correlation calculation of the magnitude of the vector product, but also when the transmission subcarrier is subjected to phase rotation at the time of reception as follows: Has a great effect.
[0026]
FIG. 8 is a diagram showing a concept different from the above in the processing according to the configuration of FIG. In FIG. 8, (a) shows a transmission subcarrier, (b) shows a state in which the transmission subcarrier (a) has undergone phase rotation during reception, and (c) shows a state in which the received signal in (b) is vector-correlated.
[0027]
Possible causes of phase rotation between adjacent subcarriers include, for example, an error when determining the symbol time of an orthogonal frequency division multiplex signal on the receiving side or interference during simultaneous reception of multipath signals. However, since the frequency interval between adjacent subcarriers is generally considered to be small even in a wideband received signal, it can be considered that the rotational phase between adjacent subcarriers has regularity even in consideration of transmission path variations (b). . Then, the signal after the adjacent subcarrier vector correlation calculation is normally observed as a substantially constant vector as shown in (c). Further, as described above, when an unnecessary signal jumps into only one of the adjacent pairs, it has an effect of removing it.
[0028]
Further, since it has a function of obtaining a constant vector as shown in FIG. 8C, it is possible to further improve the resistance against disturbance by adding the vectors after the adjacent pair operations. FIG. 9 shows the configuration at that time.
[0029]
FIG. 9 shows a different configuration in the vicinity of the adjacent carrier pair processing means of the identification device, corresponding to the input from the adjacent carrier pair processing means 120 to the output of the correlation calculation means 103 in FIG.
[0030]
The difference between FIG. 6 and FIG. 9 is that the former calculates the power (absolute value) immediately after calculating the adjacent pair vector correlation, and then calculates the correlation by referring to the information of the transmission source. The vector correlation is calculated based on the subcarrier position information of the transmission source, and the magnitude is calculated (129) after (128).
[0031]
In these configurations, the former has an advantage that the calculation amount is small, and the latter has a high resistance to disturbance.
[0032]
(Embodiment 5)
FIG. 10 is a diagram showing a receiving device having the identification device 205 described in the above embodiment as a means. In FIG. 12, 210 is an RF modulation signal input modulated at a high frequency, 201 is a reception front-end unit as frequency conversion means for converting the input modulation signal into a manageable frequency band, and 202 is a demodulation unit for extracting data from the modulation signal. , 203 is a data reproducing unit that converts data into meaningful data, 204 is an information output unit that outputs data, 205 is an identification device, and 206 is an information processing unit.
[0033]
The transmission station information obtained by the identification device 205 is useful for improving the reception state by determining the reception state and returning the information to the demodulation unit 202. If the position of the transmitting station is known in advance, the output of the identification device 205 is processed by the information processing unit 206, so that it can be used as geographical information of the reception area, and is output to the information output unit 204, and the data signal 211 Can be displayed by an external display means (not shown) or the like.
[0034]
(Embodiment 6)
FIG. 11 illustrates a transmission / reception system including the reception device described in (Embodiment 5). In FIG. 13, 212 is an information input, 213 is an RF modulation signal output, 311 is a receiving device, and 310 is a transmitting device.
[0035]
The transmission device 310 generates a signal to be transmitted to the reception device 311 including the identification device.
[0036]
By constructing a transmission / reception system having such a configuration, it is possible to construct a highly reliable system utilizing the advantages of the identification device according to the above-described embodiment.
[0037]
【The invention's effect】
As described above, according to the present invention, when a transmission system is configured with a single frequency network in a system intended to perform transmission using a plurality of carriers, a plurality of transmitting stations have different identification information, When the identification information is identified by a combination of a plurality of carriers and the transmitted adjacent carriers are the same signal, by providing an adjacent carrier pair calculation means that performs a calculation in advance on adjacent carrier pairs of the subcarrier group, An advantageous effect is obtained that the transmitting station can be reliably identified even in a large environment or a large fluctuation in the transmission path.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an identification device according to an embodiment of the present invention. FIG. 2 is a conceptual diagram showing a state of transmission of subcarriers used in the present invention. FIG. 4 is a block diagram of the configuration near the carrier pair processing means in the identification device. FIG. 4 is a block diagram of the configuration near the carrier pair processing means in the identification device according to one embodiment of the present invention. FIG. 6 is a conceptual diagram showing processing by an identification device using the configuration of FIG. 6. FIG. 7 is a block diagram of the configuration in the vicinity of carrier pair processing means in the identification device according to an embodiment of the invention. FIG. 8 is a conceptual diagram showing processing by the identification device using the configuration of FIG. 6 in one embodiment of the present invention. FIG. 8 is a conceptual diagram showing processing by the identification device using the configuration of FIG. Identification by form FIG. 10 is a block diagram of the configuration of a receiving device using the identification device according to an embodiment of the present invention. FIG. 11 is a block diagram of the identification device according to an embodiment of the present invention. Fig. 12 is a block diagram of a conventional transmission / reception system including a receiving device. Fig. 12 is a conceptual diagram of conventional multi-carrier transmission and sub-carrier transmission as an identification signal. Fig. 13 is a block diagram illustrating a conventional identification device. ]
101 Identification symbol extraction means 102 Subcarrier extraction means 103 Correlation calculation means 104 Maximum value detection means 105 Transmission source determination means 106, 124 Transmission source information storage means 110 Orthogonal frequency division multiplexed signal input 111 including identification signal Identification transmission station information output 112 Subcarrier input 113 Correlation value output 120 Adjacent subcarrier pair processing means 121 Subcarrier power (absolute value) calculation means 122 Subcarrier pair addition means 123 Scalar correlation calculation means 125 Subcarrier pair multiplication means 126 Subcarrier pair vector correlation calculation means 127 Vector power calculation means 128 Vector addition means 129 Vector power (absolute value) calculation means 201 Reception front-end signal processing means 202 Modulation signal demodulation means 203 Data reproduction means 204 Information output means 205 Discriminator 206 Information processing means 210 RF modulation signal input 211 information output 212 information input 213 RF modulated signal output 310 transmitting unit 311 receiving unit

Claims (6)

This system is intended for transmission using multiple carriers, and when a transmission system is configured with a single frequency network, multiple transmitting stations have different identification information, and the identification information is a combination of multiple carriers. Means for extracting a symbol to be identified, a means for decomposing into a subcarrier that is a representation on the frequency axis of the identification symbol, and a decomposed subcarrier Adjacent carrier pair calculation means for multiplying power between adjacent subcarriers of a carrier group, transmission source information storage means for holding a known combination of subcarriers of a transmission station, transmission source information, and Means for calculating correlations for combinations of calculation results of adjacent carrier pairs, maximum value detecting means for extracting the maximum one from the calculated correlation values, and determining the transmission source from the extracted maximum values. Configuration identification device to consist of the source determination means for. This system is intended for transmission using multiple carriers, and when a transmission system is configured with a single frequency network, multiple transmitting stations have different identification information, and the identification information is a combination of multiple carriers. Means for extracting a symbol to be identified, a means for decomposing into a subcarrier that is a representation on the frequency axis of the identification symbol, and a decomposed subcarrier Adjacent carrier pair calculation means for performing vector correlation between adjacent subcarriers of a carrier group, transmission source information storage means for holding a known combination of subcarriers of a transmission station, transmission source information and the adjacent Means for calculating correlations for combinations of calculation results of carrier pairs, maximum value detecting means for extracting a maximum one from the calculated correlation values, and a transmission source from the extracted maximum values. Configuration identification device to consist of a constant to the source determination means. It said means for calculating the correlation, identification device according scalar correlation line cormorants請 Motomeko 2 After computing the vector power of each subcarrier. Means for calculating the correlation, identifying apparatus according to calculation of vector power to the line power sale請 Motomeko 2 after the vector addition. Receiver including an identification device according to any one of claims 1 to 4. Transmission and reception system comprising an identification device according to any one of claims 1 to 4.

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