WO2013121617A1 - 受信方法及び受信装置 - Google Patents
受信方法及び受信装置 Download PDFInfo
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- WO2013121617A1 WO2013121617A1 PCT/JP2012/073998 JP2012073998W WO2013121617A1 WO 2013121617 A1 WO2013121617 A1 WO 2013121617A1 JP 2012073998 W JP2012073998 W JP 2012073998W WO 2013121617 A1 WO2013121617 A1 WO 2013121617A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03331—Arrangements for the joint estimation of multiple sequences
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
Definitions
- the present invention relates to a receiving method and a receiving apparatus.
- a wireless communication system applying the concept of MISO (Multiple Input Single Output) and MIMO (Multiple Input Multiple Output) that transmits signals using multiple antennas performs precoding on the transmitting side and predetermined on the receiving side. Since diversity gain can be easily obtained by performing signal processing, it has been adopted in various communication standards in recent years.
- MISO Multiple Input Single Output
- MIMO Multiple Input Multiple Output
- the European terrestrial digital broadcasting standard DVB-T2 Digital Video Broadcasting for Second Generation Terrestrial
- wireless LAN Local Area Network
- IEEE 802.11n IEEE 802.11n
- LTE LongSOl, etc.
- a space-time block code (STBC: Space Time Block Coding) or spatial frequency block code (SFBC: Space Frequency Block Code) using signal orthogonality is generally used as a precoding method on the transmission side. Coding) is often used.
- STBC Space Time Block Coding
- SFBC Spa Frequency Block Code
- Patent Document 1 discloses a method of performing timing detection by synthesizing output signals from one or more delay circuits that are delayed by a predetermined time with respect to signals received by a plurality of receiving antennas. Yes. In this method, the reception gain after synthesis can be improved by setting the phase at the time of signal synthesis to the same phase.
- JP 2006-352576 A (paragraph 0010, FIG. 1)
- the method disclosed in Patent Document 1 when the method disclosed in Patent Document 1 is used, the power of the received signal and noise is reduced in a transmission path environment where the amplitude and phase of the received signal change every moment and in a weak electric field environment where the received power is constantly small.
- antagonism there is a high possibility that the accuracy of the phase synthesis operation will deteriorate, and there is a high possibility that accurate timing detection cannot be performed.
- the method disclosed in Patent Document 1 may not be able to obtain a sufficient gain during signal synthesis.
- the method disclosed in Patent Document 1 described above performs signal synthesis using all received signals even when transmission path distortion components are different for each subcarrier, so that there is sufficient gain at the time of signal synthesis. There is a risk that it will not be obtained.
- the present invention provides a plurality of transmission antennas with diversity even in a transmission path environment in which the amplitude and phase of the reception signal change from moment to moment and a poor transmission path environment in which the power of the reception signal and noise antagonize.
- An object of the present invention is to make it possible to obtain a sufficient gain by using a signal transmitted from.
- a reception method includes a reception process of receiving signals transmitted from a plurality of transmission antennas, a signal processing process of separating a data signal and a known signal from the signals received in the reception process, A transmission path signal including a plurality of transmission path element signals each indicating transmission path characteristics between each of the plurality of transmission antennas from the known signal, and a transmission path characteristic between each of the plurality of transmission antennas.
- decoding an auxiliary signal generating step of generating an auxiliary signal characterized by having a a synthetic process of performing diversity combining using the decoded signal and the auxiliary signal.
- FIG. 1 is a schematic diagram showing a configuration of a communication system including a receiving apparatus according to Embodiments 1 and 2.
- FIG. 3 is a schematic diagram illustrating a known signal transmission method according to Embodiment 1.
- FIG. 2 is a block diagram schematically showing a configuration of a receiving apparatus according to Embodiment 1.
- FIG. 3 is a block diagram schematically showing a configuration of a detection unit in the first embodiment.
- 6 is a schematic diagram for explaining a distortion signal in the first embodiment.
- FIG. 6 is a schematic diagram for explaining a first frequency interpolation signal and a second frequency interpolation signal in the first embodiment.
- FIG. 3 is a block diagram schematically showing a configuration of a comparison unit in the first embodiment.
- FIG. 6 is a schematic diagram illustrating an example of an effect obtained by the receiving apparatus according to Embodiment 1.
- 5 is a block diagram schematically showing a configuration of a receiving apparatus according to Embodiment 2.
- FIG. FIG. 10 is a block diagram schematically showing a configuration of a comparison unit in the second embodiment.
- FIG. 10 is a schematic diagram schematically showing a configuration of a detection unit in modified examples of the first and second embodiments. It is the schematic for demonstrating the 3rd signal and 4th signal in the modification of Embodiment 1 and 2.
- FIG. 6 is a block diagram schematically showing a configuration of a comparison unit that is a modification of the first embodiment.
- FIG. 1 is a schematic diagram showing a configuration of a communication system 10 including a receiving device 100 according to the first embodiment.
- a communication system 10 shown in FIG. 1 is a system to which MIMO is applied.
- the communication system 10 includes a receiving device 100 including a plurality of receiving antennas 101-1, 101-2,..., 101-n (referred to as the receiving antenna 101 when there is no need to distinguish each of them), Transmitting antennas 150-1 and 150-2 (referred to as transmitting antenna 150 when there is no need to distinguish between them).
- n is an integer of 2 or more.
- one or more receiving antennas 101 may be provided. Further, it is sufficient that there are two or more transmission antennas 150.
- a system to which MISO is applied can be obtained by using one receiving antenna 101.
- the reference numerals in parentheses in FIG. 1 indicate the configuration in the second embodiment.
- transmission signals Xa and Xb transmitted from a plurality of transmission antennas 150 arrive at reception antenna 101-1 under the influence of transmission path fluctuations indicated by independent transmission path elementary signals E1a and E1b, respectively. ing.
- the reception signal R1 at the reception antenna 101-1 is expressed by the following equations (5) and (6).
- reference numeral N ⁇ b> 1 is thermal noise applied by the receiving apparatus 100.
- R1 (F1) E1a ⁇ Xa (F1) + E1b ⁇ Xb (F1) + N1 (F1)
- R1 (F2) E1a ⁇ Xa (F2) + E1b ⁇ Xb (F2) + N1 (F2) (6)
- the receiving apparatus 100 performs the above-described signal processing on the received signals R2 to Rn received by the receiving antennas 101-2 to 101-n, and synthesizes the results, thereby combining the signal Za. , Zb are output.
- a known signal may be transmitted using a unique method as shown in FIG. According to FIG. 2, in DVB-T2, a known signal is inserted every 12 subcarriers in the frequency direction and every 4 symbols in the time direction, and the first known signal C + and the second known signal C ⁇ are alternated every symbol. There is a case where the configuration arranged in the.
- the known signal is + first known signal C
- a transmission method is used in which a predetermined signal “C” is transmitted from the transmission antenna 150-1 and a predetermined signal “-C” is transmitted from the transmission antenna 150-2.
- E1a + E1b and E1a-E1b are obtained as information on the transmission path by signal processing using a known signal, and therefore transmission path information can be estimated by adding and subtracting them.
- FIG. 3 is a block diagram schematically showing a configuration of receiving apparatus 100 according to the first embodiment.
- the receiving apparatus 100 includes an antenna 101, receiving units 110-1, 110-2,..., 110-n (referred to as a receiving unit 110 when there is no need to distinguish each of them), and an auxiliary signal generating unit 120. And a combining unit 130.
- the receiving apparatus 100 receives one or more received signals R1 to Rn input from the receiving antennas 101-1 to 101-n, performs predetermined signal processing, and outputs a first combined signal Za and a second combined signal Zb. To do.
- the receiving unit 110 separates the known signal and the data signal from the received signal input from the receiving antenna 101. Then, the reception unit 110 generates a transmission path estimation signal that identifies the transmission path characteristics of the reception signal from the known signal, and provides the transmission path estimation signal to the auxiliary signal generation unit 120. In addition, receiving section 110 generates a decoded signal by decoding the data signal, and provides this decoded signal to combining section 130.
- the receiving unit 110 includes a signal processing unit 114, a detection unit 115, and a code synthesis unit 116. In the present embodiment, the same number of reception units 110 as reception antennas 101 are provided. However, since the contents of processing in each reception unit 110 are the same, in the following, from reception antenna 101-1 The reception unit 110-1 that processes the obtained reception signal R1 will be described.
- the signal processing unit 114 performs a process of separating the known signal P1 and the data signal D1 from the received signal R1. Then, the signal processing unit 114 provides the known signal P1 to the detection unit 115 and the data signal D1 to the code synthesis unit 116 and the auxiliary signal generation unit 120.
- the signal processing unit 114 includes a processing unit 111, an FFT unit 112, and a separation unit 113.
- the processing unit 111 performs signal processing for extracting the time axis signal T1 necessary for signal demodulation from the received signal R1. For example, the processing unit 111 performs signal processing that realizes functions such as tuning of the received signal R1, suppression of adjacent channel interference, and filtering. Further, when the received signal R1 is an Orthogonal Frequency Division Multiplexing (OFDM) signal, the processing unit 111 may perform signal processing for guard interval removal. Then, the processing unit 111 gives the extracted time axis signal T1 to the FFT unit 112.
- OFDM Orthogonal Frequency Division Multiplexing
- the FFT unit 112 is a demodulation unit that performs a process of demodulating the time axis signal T1.
- the FFT unit 112 has a function of performing FFT (Fast Fourier Transform) processing on the time axis signal T1 and generating an FFT signal F1 separated into signals for each subcarrier as a demodulated signal. Then, the FFT unit 112 gives the generated FFT signal F ⁇ b> 1 to the separation unit 113.
- the FFT unit 112 may use signal processing other than FFT as long as it has signal processing similar to that of FFT.
- the separation unit 113 performs a process of separating the FFT signal F1 into the known signal P1 and the data signal D1. For example, when the FFT signal F1 has a format as shown in FIG. 2, the separating unit 113 separates the signal at the subcarrier position corresponding to the known signal P1 from the FFT signal F1, thereby making the known The signal P1 can be separated from the data signal D1, which is a signal other than the known signal P1. Then, the separation unit 113 provides the known signal P1 to the detection unit 115 and the data signal D1 to the code synthesis unit 116 and the auxiliary signal generation unit 120.
- the detection unit 115 performs processing for generating a transmission path estimation signal indicating the transmission path characteristics of the reception signal R1 from the known signal P1.
- the transmission path characteristic of the reception signal R1 is a characteristic between each of the transmission antennas 150-1 and 150-2 and the reception antenna 101-1.
- the detection unit 115 calculates a distortion component of the known signal P1, generates a transmission path estimation signal based on the calculation result, and transmits the generated transmission path estimation signal to the transmission path signal E1 and the transmission path monitoring signal H1.
- the detection unit 115 provides the transmission path signal E1 to the code synthesis unit 116.
- FIG. 4 is a block diagram schematically showing the configuration of the detection unit 115.
- the detection unit 115 includes a distortion detection unit 115a, a symbol interpolation unit 115b, a signal separation unit 115c, a frequency interpolation unit 115d, and a signal calculation unit 115e.
- the distortion detection unit 115a generates a distortion signal indicating a transmission path distortion component received by the known signal P1 using a predetermined reference signal B1, and applies the distortion signal to the symbol interpolation unit 115b.
- the distortion detection unit 115a includes a reference signal storage unit 115f that stores the reference signal B1.
- This reference signal B1 is a signal corresponding to the known signal P1 before distortion occurs in the transmission path.
- FIG. 5 is a schematic diagram for explaining a distortion signal. For example, when the received signal R1 has a format as shown in FIG. 2, the distortion detector 115a generates a distortion signal indicating a transmission path distortion component in the known signals C + and C ⁇ in symbol units.
- the symbol interpolation unit 115 b performs interpolation (interpolation) of the transmission path distortion component indicated by the distortion signal in the symbol direction (time direction) with respect to the subcarrier component in which the distortion signal exists.
- a symbol interpolation signal indicating the value after insertion is generated, and this symbol interpolation signal is given to the signal separation unit 115c.
- FIG. 6 is a schematic diagram for explaining the symbol interpolation signal.
- the symbol interpolation signal indicates a transmission path distortion component indicated by the distortion signal and a component interpolated in the symbol direction based on the transmission path distortion component.
- the signal separation unit 115c is the No. symbols in ⁇ , a first signal indicative of the first known signal C + components, the second known signal C - separated into a second signal indicative of the components of To do. Then, the signal separation unit 115c gives the first signal and the second signal to the frequency interpolation unit 115d.
- 7A and 7B are schematic diagrams for explaining the first signal and the second signal.
- the first signal indicates a transmission path distortion component of the first known signal C + and a component interpolated in the symbol direction based on the transmission path distortion component.
- the second signal, the second known signal C - indicates the channel distortion components, the interpolated components in the symbol direction based on the transmission path distortion component .
- the frequency interpolation unit 115 d performs interpolation in the frequency direction based on the respective components indicated by the first signal and the second signal, and performs the first frequency interpolation signal and the second frequency interpolation. Generate an interpolated signal. Then, the frequency interpolation unit 115d gives the first frequency interpolation signal and the second frequency interpolation signal to the signal calculation unit 115e.
- 8A and 8B are schematic diagrams for explaining the first frequency interpolation signal and the second frequency interpolation signal. As shown in FIG. 8A, the first frequency interpolation signal includes a transmission path distortion component of the first known signal C + and a component interpolated in the symbol direction based on the transmission path distortion component.
- the signal calculation unit 115e transmits a channel estimation signal indicating the channel characteristics between the transmission antenna 150 and the reception antenna 101-1, from the first frequency interpolation signal and the second frequency interpolation signal. Is calculated. Then, the signal calculation unit 115e provides the generated transmission path estimation signal to the auxiliary signal generation section 120 as the transmission path signal E1 and the transmission path monitoring signal H1. For example, the signal calculation unit 115e adds the first frequency interpolation signal and the second frequency interpolation signal, thereby indicating the first transmission path characteristic between the transmission antenna 150-1 and the reception antenna 101-1. A transmission path estimation signal is calculated.
- the signal calculation unit 115e subtracts the second frequency interpolation signal from the first frequency interpolation signal, thereby indicating the second transmission characteristic indicating the transmission path characteristics between the transmission antenna 150-2 and the reception antenna 101-1.
- a path estimation signal is calculated.
- the signal calculation unit 115e uses the first transmission path estimation signal as the first transmission path element signal E1a and the first transmission path monitoring element signal H1a, and the second transmission path estimation signal as the second transmission path element signal E1b and The second transmission path monitoring element signal H2b is provided to the auxiliary signal generation unit 120.
- the signal calculation unit 115e supplies the first transmission path element signal E1a and the second transmission path element signal E1b to the code synthesis unit 116.
- a FIR (Finite Impulse Response) filter or an IIR (Infinite Impulse Response) filter is generally used.
- a method of selecting an optimum coefficient while monitoring the transmission path state can be applied.
- the code synthesis unit 116 performs a decoding process using the data signal D1 and the transmission path signal E1 to generate a decoded signal X1.
- the code synthesizing unit 116 calculates the decoded signal X1 using the equations (7) and (8) described above.
- the data signal D1a separated from the received signal R1 received at the specific frequency F1 corresponds to R1 (F1)
- the data signal D1b separated from the received signal R1 received at the other frequency F2 is obtained.
- R1 (F2) The information signal Sa ⁇ corresponds to the decoded signal X1a
- the information signal Sb ⁇ corresponds to the decoded signal X1b.
- the processing unit 111, the FFT unit 112, the separation unit 113, the detection unit 115, and the code synthesis unit 116 described above have shown examples of signal processing for the reception signal R1 received by the reception antenna 101-1, but these examples The signal processing can be operated independently for the received signals received by the n receiving antennas 101. For example, a signal similar to the signal processing performed by the processing unit 111, the FFT unit 112, the separation unit 113, the detection unit 115, and the code synthesis unit 116 for the reception signal Rn received by the reception antenna 101-n.
- the separation unit 113 outputs the data signal Dn
- the detection unit 115 outputs the transmission path signal En and the transmission path monitoring signal Hn
- the code synthesis unit 116 outputs the decoded signal Xn. .
- the auxiliary signal generation unit 120 selects a combination having a high similarity among the combinations of the first transmission path monitoring element signal and the second transmission path monitoring element signal identified from the reception signals received by the plurality of reception antennas 101.
- the auxiliary signal is generated by decoding the data signal that is identified and separated from the received signal that includes the known signal that is the generation source of the identified combination, using the identified combination. Then, the auxiliary signal generation unit 120 gives this auxiliary signal to the synthesis unit 130.
- the auxiliary signal generation unit 120 includes an arithmetic unit 121, a comparison unit 122, a selection unit 123, and auxiliary code synthesis units 124-1, 124-2,..., 124-i (in particular, it is not necessary to distinguish each of them) Sometimes referred to as an auxiliary code synthesizing unit 124).
- i is an integer that satisfies i ⁇ n (n ⁇ 1). Note that there may be one or more auxiliary code synthesis units 124.
- the calculation unit 121 calculates a similarity using a plurality of transmission path monitoring elementary signals, and generates a similarity signal including one or more similarity elementary signals indicating the calculation result.
- the transmission line monitoring signal includes two types of signals, that is, the first transmission line monitoring element signals H1a to Hna and the second transmission line monitoring element signals H1b to Hnb
- the calculation unit 121 has one or more. By selecting one signal from each of the first transmission path monitoring element signals H1a to Hna and one or more second transmission path monitoring element signals H1b to Hnb, and calculating a value indicating the similarity between the two, One or more similarity elementary signals L1 to Lm are generated.
- the operation unit 121 provides the comparison unit 122 with the similarity signal L including the generated similarity degree elementary signals L1 to Lm.
- the similarity signal L is a signal that can identify the first transmission path monitoring element signal and the second transmission path monitoring element signal for which the similarity is calculated in association with the similarity elementary signals L1 to Lm. Is included.
- the first transmission line monitoring element signal Hpa selected from the first transmission line monitoring element signals H1a to Hna is derived from the second transmission line monitoring element signals H1b to Hnb. It is desirable to be generated from a received signal received by a receiving antenna 101 different from the selected second transmission path monitoring element signal Hqb.
- the calculation unit 121 can calculate the similarity between the first transmission path monitoring element signal and the second transmission path monitoring element signal by performing the calculation of the following equation (9). However, 1 ⁇ p ⁇ n, 1 ⁇ q ⁇ n, and 1 ⁇ k ⁇ m. It is desirable that p ⁇ q.
- is a value obtained by normalizing the first transmission line monitoring element signal
- is a value obtained by normalizing the second transmission line monitoring element signal. Therefore, by taking the difference between the two, the similarity between Hpa and Hqb can be quantified without depending on the absolute value. Then, by using the calculation of the equation (9), the higher the similarity between the first transmission line monitoring element signal and the second transmission line monitoring element signal, the smaller the absolute value of the similarity element signal.
- the elementary similarity signal can be used as an index of similarity.
- the calculation unit 121 can indicate the magnitude of the similarity by the value of the similarity degree signal so that the magnitude of the similarity degree and the value of the similarity degree elementary signal are in a proportional relationship. If there is, the similarity may be calculated by a calculation other than the expression (9).
- the first transmission path monitoring element signal selected by the calculation unit 121 is received by a receiving antenna 101 different from the receiving antenna 101 used when receiving the reception signal that is the generation source of the second transmission path monitoring element signal.
- m n (n ⁇ 1).
- the comparison unit 122 compares the similarity elementary signals L1 to Lm constituting the similarity signal L, and generates a control signal C indicating a transmission path monitoring elementary signal having a high similarity based on the comparison result. For example, the comparison unit 122 compares the similarity similarity signals L1 to Lm with a predetermined threshold value J, and determines whether or not the similarity is high. Next, a signal for specifying a transmission path monitoring element signal corresponding to the similarity element signal determined to have a high degree of similarity can be selected and output as a control signal C.
- FIG. 9 is a block diagram schematically showing the configuration of the comparison unit 122.
- the comparison unit 122 includes a threshold value comparison unit 122a and a control signal output unit 122b.
- the degree signal L includes n (n ⁇ 1), that is, 56 kinds of elementary similarity signals L1 to L56.
- the similarity elementary signal L21 indicates a similarity calculation result using the first transmission path monitoring elementary signal H3a and the second transmission path monitoring elementary signal H7b
- the similarity elementary signal L34 indicates the first transmission path monitoring.
- the similarity calculation result using the elementary signal H5a and the second transmission line monitoring elementary signal H6b is shown, and it is assumed that the higher the degree of similarity is, the lower the degree of similarity element signal is.
- the value of the signal L34 is a small value, and the values of the other elementary similarity signals are large values.
- the similarity signal L generated by the calculation unit 121 is input to the threshold value comparison unit 122a of the comparison unit 122.
- the threshold comparison unit 122a compares the 56 types of elementary similarity signals L1 to L56 with a predetermined threshold J and determines whether or not similarity is possible. As a result, the similarity element signal L21 and the similarity element signal L34, which are determined to have high similarity, are provided to the control signal output unit 122b.
- the control signal output unit 122b generates an index that can identify the transmission path monitoring elementary signals H3a and H7b referred to for obtaining the similarity elementary signal L21, for example, a control elementary signal C1 indicating 3a and 7b.
- the control signal output unit 122b generates an index that can identify the transmission path monitoring elementary signals H5a and H6b referred to for obtaining the similarity elementary signal L34, for example, a control elementary signal C2 indicating 5a and 6b.
- the control signal output unit 122b provides the selection unit 123 with the control signal C including the control element signals C1 and C2.
- the comparison unit 122 can extract a combination of transmission path monitoring elementary signals having a high degree of similarity and output a control signal C indicating the extraction result.
- the selection unit 123 selects the data signal D and the transmission path signal E corresponding to the control signal C, and selects them as the selection data signal I and the selection transmission path signal K to the auxiliary code synthesis unit 124.
- the selection unit 123 selects the data signal D and the transmission path element signal E having the same index as the index indicated by the control signal C, and selects the selected data signal D and transmission path element signal E as the selected data.
- the signal I and the selected transmission line element signal K are given to the auxiliary code synthesis unit 124.
- the selection unit 123 designates the data signals D3a and D7b corresponding to the index indicated by the control element signal C1 as the selected data signals I1a and I1b, and selects the transmission line element signals E3a and E7b corresponding to the index indicated by the control element signal C1. Let them be elementary signals K1a and K1b.
- the selection unit 123 sets the data signals D5a and D6b corresponding to the index indicated by the control element signal C2 as the selection data signals I2a and I2b, and selects the transmission path element signals E5a and E6b corresponding to the control element signal C2.
- Elementary signals K2a and K2b can be used.
- the selection unit 123 can have a function of extracting only the data signal D having a transmission path distortion component having high similarity and the transmission path element signal E corresponding thereto.
- the auxiliary code synthesis unit 124 performs a decoding process using the selected data signal I and the selected transmission path element signal K, and outputs an auxiliary signal.
- the decoding process in the auxiliary code synthesis unit 124 is the same as the decoding process in the code synthesis unit 116.
- the auxiliary code synthesis unit 124 can calculate the auxiliary signal Y using the equations (7) and (8).
- the selection data signal I1a or I2a corresponds to R1 (F1)
- the selection data signal I1b or I2b corresponds to R1 (F2).
- the selected transmission line element signal K1a or K2a corresponds to E1a
- the selected transmission line signal K1b or K2b corresponds to E1b
- the information signal Sa ⁇ corresponds to the auxiliary signal Ya
- the information signal Sb ⁇ corresponds to the decoded signal Yb.
- the auxiliary signal Y can be calculated using the same concept.
- the auxiliary code synthesis unit 124 when it is assumed that the types of the selection data signal I and the selected transmission line signal K output from the selection unit 123 are i types, the auxiliary code synthesis unit 124 generates the i types of auxiliary signals Y1 to Yi. It is desirable to have i systems.
- the combining unit 130 performs diversity combining using one or more decoded signals X and one or more auxiliary signals Y, and generates a first combined signal Za and a second combined signal Zb.
- the synthesizing unit 130 can generate the first synthesized signal Za and the second synthesized signal Zb by performing an operation such as the following equation (10).
- the combining unit 130 may not be an operation as shown in the equation (10). Signal processing similar to diversity combining by selective combining, equal gain combining, maximum ratio combining, or the like may be performed.
- the synthesis unit 130 selects an arbitrary number of at least one of the highly reliable decoded signal X and auxiliary signal Y from the one or more decoded signals X and the one or more auxiliary signals Y. For example, signal processing similar to diversity combining by selective combining, equal gain combining, maximum ratio combining, or the like may be performed on the signal. For example, the synthesis unit 130 selects any number of the decoded signal X and the auxiliary signal Y from the one or more decoded signals X and the one or more auxiliary signals Y in descending order of amplitude or power, Signal processing similar to diversity combining by selective combining, equal gain combining, maximum ratio combining, or the like can be performed on these signals.
- the data signal D is decoded using the transmission path signal E output from the detecting unit 115 to obtain the decoded signal X
- the auxiliary The signal generator 120 can extract a combination of data signals D having similar transmission path distortion components from the plurality of received signals R and perform decoding to obtain an auxiliary signal. For this reason, in addition to all the decoded signals corresponding to the number of reception antennas, spatial synthesis can be performed using auxiliary signals, and a highly accurate synthesized signal can be output.
- the auxiliary signal is decoded from a combination of the data signals D having similar transmission line distortion components, the average signal-to-noise ratio of the diversity combined signals is uniform, and a high diversity effect can be obtained. .
- FIG. 10 is a schematic diagram illustrating an example of an effect obtained by the receiving apparatus 100 according to the first embodiment.
- An example of an effect expected when the second transmission path monitoring element signal H1b at the receiving antenna 101-1 and the first transmission path monitoring element signal H2a at the receiving antenna 101-2 are the same is shown.
- the modulation method used for transmitting the information signal is QPSK (Quadrature Phase Shift Keying).
- CNR Carrier-to-Noise power Ratio
- BER bit error rate
- FIG. 11 is a block diagram schematically showing a configuration of receiving apparatus 200 according to Embodiment 2.
- the receiving device 200 includes a receiving unit 110, an auxiliary signal generating unit 220, and a synthesizing unit 230.
- Receiving apparatus 200 according to Embodiment 2 differs from receiving apparatus 100 according to Embodiment 1 in auxiliary signal generation section 220 and combining section 230.
- the auxiliary signal generation unit 220 includes a calculation unit 121, a comparison unit 222, a selection unit 123, and an auxiliary code synthesis unit 124.
- the auxiliary signal generation unit 220 in the second embodiment is different from the auxiliary signal generation unit 120 in the first embodiment in the comparison unit 222.
- the comparison unit 222 performs the same processing as that of the first embodiment, and corresponds to the higher similarity among the respective similarity elementary signals L1 to Lm, and the higher the similarity, the higher the similarity.
- a reliability signal including a reliability elementary signal indicating a reliability value is generated.
- the comparison unit 222 compares the similarity degree elementary signals L1 to Lm with the predetermined threshold value J in the same manner as the signal processing of the comparison unit 122 in the first embodiment, and as a result, the similarity determined to have a high degree of similarity.
- a reliability signal G including a reliability elementary signal indicating a higher reliability value as the similarity is higher is generated.
- the reliability signal G is composed of i types of reliability elementary signals G1 to Gi.
- FIG. 12 is a block diagram schematically showing the configuration of the comparison unit 222 in the second embodiment.
- the comparison unit 222 includes a threshold comparison unit 122a and a control signal output unit 222b.
- the comparison unit 222 in the second embodiment is different from the comparison unit 122 in the first embodiment in the control signal output unit 222b.
- the control signal output unit 222b generates the control signal C and supplies the control signal C to the selection unit 123.
- the control signal output unit 222b corresponds to the similarity similarity signal determined to be high by the threshold comparison unit 122a.
- a reliability element signal that has a higher value as the degree of similarity indicated by the similarity element signal is higher is generated, and a reliability signal G including the reliability element signal is generated.
- the control signal output unit 222b is referred to in order to obtain the similarity similarity signal L21.
- the reliability value is calculated such that the higher the similarity between the transmission path monitoring element signals H3a and H7b, the greater the value.
- the control signal output unit 222b generates a reliability elementary signal G1 indicating the calculated reliability value.
- the control signal output unit 222b calculates a reliability value that increases as the similarity between the transmission path monitoring element signals H5a and H6b referred to for obtaining the similarity element signal L34 increases.
- the control signal output unit 222b generates a reliability element signal G2 indicating the calculated reliability value.
- the control signal output unit 222 b gives the similarity signal G including the reliability elementary signals G ⁇ b> 1 and G ⁇ b> 2 to the synthesis unit 230.
- the synthesis unit 230 obtains a multiplication result obtained by multiplying one or more decoded signals X and one or more auxiliary signals Y by a weighting coefficient based on the corresponding reliability signal G.
- the diversity combining is performed to generate the first combined signal Za and the second combined signal Zb.
- the synthesizing unit 230 can generate the first synthesized signal Za and the second synthesized signal Zb by performing an operation such as the following equation (11).
- the combining unit 230 performs diversity combining using one or more decoded signals X and one or more auxiliary signals Y weighted based on the reliability signal G. For example, signal processing similar to diversity combining by selective combining, equal gain combining, or maximum ratio combining may be performed.
- the synthesizing unit 230 may select at least one of the decoded signal X and the auxiliary signal Y with high reliability from the one or more decoded signals X and the one or more auxiliary signals Y weighted based on the reliability signal G. Any number of the signals can be selected, and signal processing similar to diversity combining by, for example, selection combining method, equal gain combining method, maximum ratio combining method, or the like can be performed. For example, the synthesis unit 230 selects the decoded signal X and the auxiliary signal Y in descending order of signal amplitude or power from the one or more decoded signals X and the one or more auxiliary signals Y weighted based on the reliability signal G. It is also possible to select an arbitrary number of at least one of these and perform signal processing similar to diversity combining by, for example, selection combining method, equal gain combining method, maximum ratio combining method, or the like on these signals.
- the data signal D is decoded using the transmission path signal E output from the detection unit 115 to obtain the decoded signal X, and the auxiliary signal
- the generation unit 220 can extract a combination of data signals D having similar transmission path distortion components from the plurality of received signals R, decode the data signals D, and obtain an auxiliary signal Y.
- the similarity of the transmission path distortion components received by the extracted data signal can be maintained.
- the transmission path distortion suppression effect can be further improved. And an information signal with higher accuracy can be output.
- the contents of the first embodiment and the second embodiment described above exemplify aspects applicable to a receiving apparatus to which the receiving method of the present invention is applied, and the present invention is not limited to this.
- FIG. 13 is a schematic diagram schematically showing a configuration of a detection unit 215 that is a modification of the detection unit 115 in the first and second embodiments.
- the detection unit 215 includes a distortion detection unit 115a, a symbol interpolation unit 115b, a signal separation unit 115c, a frequency interpolation unit 115d, a signal calculation unit 115e, a signal separation unit 215g, and a known signal interpolation unit 215h. And a signal calculation unit 215i.
- the detection unit 215 in the modification is different from the detection unit 115 in the first and second embodiments in that it further includes a signal separation unit 215g, a known signal interpolation unit 215h, and a signal calculation unit 215i.
- the processing in distortion detection section 115a, symbol interpolation section 115b, signal separation section 115c, frequency interpolation section 115d, and signal calculation section 115e is the same as in Embodiments 1 and 2.
- the signal calculation unit 115e gives the generated transmission path estimation signal to the auxiliary signal generation sections 120 and 220 and the code synthesis section 116 as the transmission path signal E1.
- Signal separating unit 215g is the distortion signals generated by the distortion detection section 115a, a third signal indicative of a first known signal C + components, the second known signal C - is separated into a fourth signal indicating the components of . Then, the signal separation unit 215g gives the third signal and the fourth signal to the known signal interpolation unit 215h.
- 14A and 14B are schematic diagrams for explaining the third signal and the fourth signal. As shown in FIG. 14A, the third signal indicates a transmission path distortion component of the first known signal C + . As shown in FIG. 14 (B), the fourth signal, the second known signal C - indicating channel distortion components.
- the known signal interpolation unit 215 h performs interpolation at a position corresponding to the second known signal C ⁇ based on the respective components indicated by the third signal, and obtains the third interpolation signal. At the same time, based on each component indicated by the fourth signal, interpolation is performed at a position corresponding to the first known signal C + to generate a fourth interpolation signal. Then, the known signal interpolation unit 215h gives the third interpolation signal and the fourth interpolation signal to the signal calculation unit 215i.
- FIGS. 15A and 15B are schematic diagrams for explaining the third interpolation signal and the fourth interpolation signal. As shown in FIG.
- the third interpolated signal corresponds to the second known signal C ⁇ based on the transmission path distortion component of the first known signal C + and the transmission path distortion component. And the component interpolated at the position to be.
- the fourth interpolation signal corresponds to the first known signal C + based on the transmission path distortion component of the second known signal C ⁇ and the transmission path distortion component. And the component interpolated at the position to be.
- the signal calculation unit 215i calculates a transmission path estimation signal indicating the transmission path characteristics between the transmission antenna 150 and the reception antenna 101 from the third interpolation signal and the fourth interpolation signal. Then, the signal calculation unit 215i gives the generated transmission path estimation signal to the auxiliary signal generation section 120 as the transmission path monitoring signal H1. For example, the signal calculation unit 215i adds the third interpolation signal and the fourth interpolation signal to thereby add the first transmission path indicating the transmission path characteristics between the transmission antenna 150-1 and the reception antenna 101-1. An estimated signal is calculated.
- the signal calculation unit 215i subtracts the fourth interpolation signal from the third interpolation signal, so that the second transmission path estimation indicating the transmission path characteristics between the transmission antenna 150-2 and the reception antenna 101-1. Calculate the signal.
- the signal calculation unit 215i uses the first transmission path estimation signal as the first transmission path monitoring element signal H1a, the second transmission path estimation signal as the second transmission path monitoring element signal H1b, the auxiliary signal generation section 120, 220.
- the detection unit 215 uses the signal separation unit 215g, the known signal interpolation unit 215h, and the signal calculation unit 215i to perform interpolation only at a position corresponding to the known signal, and performs the first transmission path.
- a monitoring element signal and a second transmission line monitoring element signal can be generated.
- the processing in the calculation unit 121 and the comparison units 122 and 222 can be performed until the transmission line signal E is calculated, and the entire processing in the receiving apparatuses 100 and 200 can be performed quickly. .
- FIG. 16 is a block diagram schematically showing a configuration of a comparison unit 322 which is a modification of the comparison unit 122 in the first embodiment.
- the comparison unit 322 in the modified example compares the similarity elementary signals L1 to Lm constituting the similarity signal L, and generates the control signal C indicating the transmission path monitoring elementary signal having the highest similarity based on the comparison result. To do.
- the comparison unit 322 includes a maximum similarity detection unit 322a and a control signal output unit 322b.
- the similarity signal L includes n (n ⁇ 1), that is, 56 kinds of elementary similarity signals L1 to L56.
- the similarity element signal L34 indicates a similarity calculation result using the first transmission path monitoring element signal H5a and the second transmission path monitoring element signal H6b, and the value of the similarity element signal increases as the similarity degree increases. Is assumed to be small, the value of the similarity elemental signal L34 is the smallest value, and the values of other similarity elemental signals are larger than that.
- the maximum similarity detection unit 322a detects L34 having the minimum value from the 56 types of elementary similarity signals L1 to L56, and supplies the detected L34 to the control signal output unit 322b.
- the control signal output unit 322b receives an index, for example, a control element signal C1 indicating 5a and 6b, which is information that can identify the transmission path monitoring element signals H5a and H6b referred to in order to obtain the similarity element signal L34.
- a control signal C including the same is generated and given to the selection unit 123.
- the control signal output unit 322b generates a reliability signal G including the reliability element signal G1 corresponding to the similarity element signal determined to have high similarity, and supplies the reliability signal G to the synthesis unit 230. .
- received signal R includes a plurality of signals received for each adjacent reception time unit.
- received signal includes a plurality of signals received for each adjacent subcarrier frequency unit.
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Abstract
Description
図1は、実施の形態1に係る受信装置100を含む通信システム10の構成を示す概略図である。図1に示されている通信システム10は、MIMOを適用したシステムである。通信システム10は、複数の受信アンテナ101-1、101-2、・・・、101-n(特に各々を区別する必要がないときは、受信アンテナ101という)を備える受信装置100と、複数の送信アンテナ150-1、150-2(特に各々を区別する必要がないときは、送信アンテナ150という)とを備える。ここで、nは、2以上の整数である。但し、受信アンテナ101は、1つ以上あればよい。また、送信アンテナ150は、2つ以上あればよい。なお、図1に示されている通信システム10において、受信アンテナ101を1つにすることで、MISOを適用したシステムにすることができる。なお、図1の括弧内の符号は、実施の形態2における構成を示している。
Xa(F1)=Sa (1)
Xb(F1)=Sb (2)
Xa(F2)=-Sb* (3)
Xb(F2)=Sa* (4)
R1(F1)=E1a・Xa(F1)+E1b・Xb(F1)+N1(F1) (5)
R1(F2)=E1a・Xa(F2)+E1b・Xb(F2)+N1(F2) (6)
なお、例えば、送信信号がSTBCを用いてプリコーディングされている場合であっても、同じ考え方を利用して補助信号Yを算出することが可能である。
図1に示されているように、実施の形態2における通信システム20は、受信装置200と、複数の送信アンテナ150とを備える。
図11は、実施の形態2に係る受信装置200の構成を概略的に示すブロック図である。受信装置200は、受信部110と、補助信号生成部220と、合成部230とを備える。実施の形態2に係る受信装置200は、補助信号生成部220及び合成部230において、実施の形態1に係る受信装置100と異なっている。
Claims (20)
- 複数の送信アンテナから送信された信号を受信する受信過程と、
前記受信過程で受信された信号から、データ信号及び既知信号を分離する信号処理過程と、
前記既知信号から、前記複数の送信アンテナの各々との間の伝送路特性をそれぞれ示す複数の伝送路素信号を含む伝送路信号、及び、前記複数の送信アンテナの各々との間の伝送路特性をそれぞれ示す複数の伝送路監視素信号を含む伝送路監視信号を検出する検出過程と、
前記伝送路信号を用いて、前記データ信号を復号して、復号信号を生成する符号合成過程と、
前記伝送路監視素信号の組み合わせの内、類似度が高い伝送路監視素信号の組み合わせを特定し、当該特定された組み合わせを用いて、当該特定された組み合わせに対応するデータ信号を復号して、補助信号を生成する補助信号生成過程と、
前記復号信号及び前記補助信号を用いてダイバーシチ合成を行う合成過程と、を有すること
を特徴とする受信方法。 - 前記補助信号生成過程では、前記組み合わせに含まれる伝送路監視素信号の差分により、前記類似度を算出すること
を特徴とする請求項1に記載の受信方法。 - 前記受信過程では、複数の受信アンテナで信号を受信し、
前記組み合わせは、前記複数の受信アンテナの内から選択された一の受信アンテナと、前記複数の送信アンテナの内から選択された何れかの送信アンテナとの間の伝送路特性を示す伝送路監視素信号、及び、前記複数の受信アンテナの内から選択された他の受信アンテナと、前記複数の送信アンテナの内から選択された何れかの送信アンテナとの間の伝送路特性を示す伝送路監視素信号、の組み合わせであること
を特徴とする請求項1又は2に記載の受信方法。 - 前記補助信号生成過程では、前記類似度を予め定められた閾値と比較して、当該比較結果により、前記類似度が高い伝送路素信号の組み合わせを特定すること
を特徴とする請求項1から3の何れか一項に記載の受信方法。 - 前記補助信号生成過程では、前記類似度が最も高い伝送路素信号の組み合わせを特定すること
を特徴とする請求項1から3の何れか一項に記載の受信方法。 - 前記合成過程では、前記復号信号及び前記補助信号から信頼性の高い信号を選択して、前記ダイバーシチ合成を行うこと
を特徴とする請求項1から5の何れか一項に記載の受信方法。 - 前記補助信号生成過程では、前記特定された組み合わせの類似度が高いほど高い信頼度を示す信頼度信号を生成し、
前記合成過程では、前記特定された組み合わせに対応するデータ信号から復号された補助信号に、前記特定された組み合わせの信頼度信号で示される信頼度に応じた値を加重して、前記ダイバーシチ合成を行うこと
を特徴とする請求項1から5の何れか一項に記載の受信方法。 - 前記合成過程では、前記復号信号及び前記加重された補助信号から信頼性の高い信号を選択して、前記ダイバーシチ合成を行うこと
を特徴とする請求項7に記載の受信方法。 - 前記検出過程では、前記既知信号を予め定められた基準信号と比較することにより、前記受信アンテナとの間の歪み成分を算出し、当該歪み成分を時間方向及び周波数方向に補間して、前記伝送路信号及び前記伝送路監視信号を生成すること
を特徴とする請求項1から8の何れか一項に記載の受信方法。 - 前記検出過程では、前記既知信号を予め定められた基準信号と比較することにより、前記受信アンテナとの間の歪み成分を算出し、当該歪み成分を前記既知信号に対応する位置において補間して、前記伝送路監視信号を生成すると共に、当該歪み成分を時間方向及び周波数方向に補間して、前記伝送路信号を生成すること
を特徴とする請求項1から8の何れか一項に記載の受信方法。 - 前記受信信号は、隣接する受信時間単位毎に受信された複数の信号を含むこと
を特徴とする請求項1から10の何れか一項に記載の受信方法。 - 前記受信信号は、隣接するサブキャリア周波数単位毎に受信された複数の信号を含むこと
を特徴とする請求項1から10の何れか一項に記載の受信方法。 - 複数の送信アンテナから送信された信号を受信する受信アンテナと、
前記受信アンテナで受信された信号から、データ信号及び既知信号を分離する信号処理部と、
前記既知信号から、前記複数の送信アンテナの各々との間の伝送路特性をそれぞれ示す複数の伝送路素信号を含む伝送路信号、及び、前記複数の送信アンテナの各々との間の伝送路特性をそれぞれ示す複数の伝送路監視素信号を含む伝送路監視信号を検出する検出部と、
前記伝送路信号を用いて、前記データ信号を復号して、復号信号を生成する符号合成部と、
前記伝送路監視素信号の組み合わせの内、類似度が高い伝送路監視素信号の組み合わせを特定し、当該特定された組み合わせを用いて、当該特定された組み合わせに対応するデータ信号を復号して、補助信号を生成する補助信号生成部と、
前記復号信号及び前記補助信号を用いてダイバーシチ合成を行う合成部と、を備えること
を特徴とする受信装置。 - 前記補助信号生成部は、前記組み合わせに含まれる伝送路監視素信号の差分により、前記類似度を算出すること
を特徴とする請求項13に記載の受信装置。 - 前記受信アンテナを複数備え、
前記組み合わせは、前記複数の受信アンテナの内から選択された一の受信アンテナと、前記複数の送信アンテナの内から選択された何れかの送信アンテナとの間の伝送路特性を示す伝送路監視素信号、及び、前記複数の受信アンテナの内から選択された他の受信アンテナと、前記複数の送信アンテナの内から選択された何れかの送信アンテナとの間の伝送路特性を示す伝送路監視素信号、の組み合わせであること
を特徴とする請求項13又は14に記載の受信装置。 - 前記補助信号生成部は、前記類似度を予め定められた閾値と比較して、当該比較結果により、前記類似度が高い伝送路素信号の組み合わせを特定すること
を特徴とする請求項13から15の何れか一項に記載の受信装置。 - 前記補助信号生成部は、前記類似度が最も高い伝送路素信号の組み合わせを特定すること
を特徴とする請求項13から15の何れか一項に記載の受信装置。 - 前記補助信号生成部は、前記特定された組み合わせの類似度が高いほど高い信頼度を示す信頼度信号を生成し、
前記合成部は、前記特定された組み合わせに対応するデータ信号から復号された補助信号に、前記特定された組み合わせの信頼度信号で示される信頼度に応じた値を加重して、前記ダイバーシチ合成を行うこと
を特徴とする請求項13から17の何れか一項に記載の受信装置。 - 前記検出部は、前記既知信号を予め定められた基準信号と比較することにより、前記受信アンテナとの間の歪み成分を算出し、当該歪み成分を時間方向及び周波数方向に補間して、前記伝送路信号及び前記伝送路監視信号を生成すること
を特徴とする請求項13から18の何れか一項に記載の受信装置。 - 前記検出部は、前記既知信号を予め定められた基準信号と比較することにより、前記受信アンテナとの間の歪み成分を算出し、当該歪み成分を前記既知信号に対応する位置において補間して、前記伝送路監視信号を生成すると共に、当該歪み成分を時間方向及び周波数方向に補間して、前記伝送路信号を生成すること
を特徴とする請求項13から18の何れか一項に記載の受信装置。
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