WO2010101156A1 - 無線通信システム、送信装置および受信装置 - Google Patents
無線通信システム、送信装置および受信装置 Download PDFInfo
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- WO2010101156A1 WO2010101156A1 PCT/JP2010/053357 JP2010053357W WO2010101156A1 WO 2010101156 A1 WO2010101156 A1 WO 2010101156A1 JP 2010053357 W JP2010053357 W JP 2010053357W WO 2010101156 A1 WO2010101156 A1 WO 2010101156A1
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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
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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
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0667—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal
- H04B7/0671—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of delayed versions of same signal using different delays between antennas
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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
- H04B7/0891—Space-time diversity
- H04B7/0894—Space-time diversity using different delays between antennas
Definitions
- the present invention relates to a wireless communication system that uses a plurality of antennas for signal transmission and reception, respectively.
- the transmitting apparatus includes two antennas, and transmits a modulated wave delayed by one time slot or more to one antenna that radiates a modulated wave from the other antenna.
- the receiving apparatus performs multipath processing that emphasizes and extracts the main wave component included in the received wave. Thereby, it is possible to obtain a diversity effect by space and frequency diversity without expanding the band.
- Patent Document 1 Such a technique is disclosed in Patent Document 1 below.
- the number of transmission antennas is limited to two and the number of reception antennas is limited to one transmission diversity. Therefore, there is a problem that it cannot be applied when a plurality of antennas are used for transmission and reception.
- the present invention has been made in view of the above, and an object of the present invention is to obtain a wireless communication system capable of providing an appropriate amount of delay when a plurality of antennas are used for transmission and reception.
- the present invention is a wireless communication system including a transmission device including a plurality of transmission antennas and a reception device including a plurality of reception antennas
- the transmission apparatus includes a branching unit that branches a signal into a plurality of transmission signals that pass through a plurality of signal paths corresponding to the plurality of transmission antennas, and a transmission delay that is provided in at least one of the signal paths and adds a delay to the transmission signal And when the transmission signal branched by the branching means is delayed by the transmission delay means, the transmission signal to which the delay is added is used as a transmission signal, and each transmission signal is transmitted to the plurality of transmissions.
- the signal is transmitted to the receiving device via an antenna, and the receiving device is provided in at least one of a plurality of signal paths through which a plurality of received signals received by the plurality of receiving antennas are received.
- FIG. 1 is a diagram illustrating a configuration example of a wireless communication system.
- FIG. 2 is a diagram illustrating a configuration example of a transmission apparatus.
- FIG. 3 is a diagram illustrating a configuration example of a receiving apparatus.
- FIG. 4 is a diagram for explaining stream composition.
- FIG. 5 is a diagram illustrating a configuration example of a transmission apparatus.
- FIG. 6 is a diagram illustrating a configuration example of a transmission apparatus.
- FIG. 7 is a diagram illustrating a configuration example of a receiving apparatus.
- FIG. 8 is a diagram illustrating stream composition.
- FIG. 9 is a diagram illustrating a configuration example of a transmission apparatus.
- FIG. 10 is a diagram illustrating a configuration example of a receiving device.
- FIG. 10 is a diagram illustrating a configuration example of a receiving device.
- FIG. 11 is a diagram illustrating a configuration example of a transmission apparatus.
- FIG. 12 is a diagram illustrating a configuration example of a receiving device.
- FIG. 13 is a diagram for explaining stream composition.
- FIG. 14 is a diagram illustrating a configuration example of a transmission apparatus.
- FIG. 15 is a diagram illustrating a configuration example of a receiving device.
- FIG. 16 is a diagram illustrating a configuration example of a transmission apparatus.
- FIG. 17 is a diagram illustrating a configuration example of a receiving device.
- FIG. 18 is a diagram illustrating a configuration example of a transmission device.
- FIG. 19 is a diagram illustrating a configuration example of a receiving device.
- FIG. 20 is a diagram illustrating a configuration example of a transmission apparatus.
- FIG. 21 is a diagram illustrating a configuration example of a receiving device.
- FIG. 22 is a diagram illustrating a configuration example of a transmission apparatus.
- FIG. 23 is a diagram illustrating
- Embodiment 1 FIG.
- the number of transmission antennas of the transmission apparatus is M
- the number of spatial multiplexing is 1
- the number of reception antennas of the reception apparatus is N
- the number of spatial multiplexing is 1
- the modulation unit and the demodulation unit are multipath transmission countermeasures.
- FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to the present embodiment.
- the transmission apparatus includes M transmission antennas and a reception apparatus including N reception antennas.
- M transmission antennas M transmission antennas
- N reception antennas N reception antennas
- FIG. 2 is a diagram illustrating a configuration example of a transmission device.
- the transmission apparatus includes a modulation unit 11, signal lines 12-1 to 12-M, delay units 13-2 to 13-M, gain applying units 14-1 to 14-M, and transmission antennas 15-1 to 15-15. -M.
- the modulation unit 11 generates a transmission signal.
- the signal lines 12-1 to 12-M are signal lines obtained by branching a transmission signal to the same number as the number of transmission antennas by branching means (not shown).
- the delay units 13-2 to 13-M perform delay processing on the transmission signal.
- the gain applying units 14-1 to 14-M add a complex gain to the transmission signal.
- the transmission antennas 15-1 to 15-M transmit a transmission signal to the reception device.
- FIG. 3 is a diagram illustrating a configuration example of a receiving device.
- the receiving device includes receiving antennas 21-1 to 21-N, gain applying units 22-1 to 22-N, delay units 23-2 to 23-N, an adding unit 24, and a demodulating unit 25. .
- the reception antennas 21-1 to 21-N receive the reception signal from the transmission device.
- Gain applying sections 22-1 to 22-N add a complex gain to the received signal.
- the delay units 23-2 to 23-N perform delay processing on the received signal.
- the adder 24 adds the received signals after the delay.
- the demodulator 25 demodulates the received signal after addition.
- the modulation unit 11 In the transmission apparatus, the modulation unit 11 generates a transmission signal and branches it into M series of signal lines 12-1 to 12-M. Among these, the signal lines 12-2 to 12-M input the transmission signals to the delay units 13-2 to 13-M connected thereto, respectively.
- D (i ⁇ 1) is given in the delay unit 13-i (2 ⁇ i ⁇ M) using a certain fixed time D as a reference time.
- D 1 / ((MN ⁇ 1) ⁇ f)
- the transmission signal from the signal line 12-1 and the delayed transmission signal from the delay units 13-2 to 13-M are input, and each is multiplied by a complex gain.
- the complex gain A i multiplied by the transmission signal of the transmission antenna 15-i (1 ⁇ i ⁇ M) uses a real gain G i (0 ⁇ G i ) and a phase ⁇ i (0 ⁇ ⁇ i ⁇ 2 ⁇ ). Is expressed by the following equation (1).
- the amplitude may be multiplied by G i and the phase may be changed by ⁇ i .
- the gain imparting process here is arbitrary, and may not be performed if not necessary for obtaining the diversity effect.
- the positions of the delay units 13-2 to 13-M and the gain applying units 14-2 to 14-M may be changed. Transmitting antennas 15-1 to 15-M transmit the transmission signals after gain addition from gain applying sections 14-1 to 14-M to the receiving apparatus.
- the receiving antennas 21-1 to 21-N input the received signals received to the gain applying units 22-1 to 22-N.
- the gain applying units 22-1 to 22-N perform complex gain application. However, the gain application process here is optional, and may not be performed if it is not necessary to obtain the diversity effect.
- the delay units 23-2 to 23-N receive the received signals from the gain applying units 22-2 to 22-N, and as an example of an appropriate delay amount for obtaining the diversity effect, the transmission signal mounting delay amount DM Is used to provide DM (j ⁇ 1) in the delay unit 23-j (2 ⁇ j ⁇ N).
- the method of setting the delay amount for each receiving antenna is not limited to this.
- Adder 24 combines the received signal from signal line 22-1 and the delayed received signals from delay units 23-2 to 23-N. Thereafter, the demodulation unit 25 performs demodulation processing on the combined received signal.
- FIG. 4 is a diagram for explaining stream composition.
- the dotted line interval represents the sampling interval based on the delay amount D, and the solid line represents the main signal.
- the transmission apparatus transmits the signal output from the modulation unit 11 and the signals delayed by the delay amounts D, 2D, and 3D in the delay units 13-2 to 13-4 to four transmission antennas 15-1 to 15-4, respectively.
- the receiving apparatus receives four signals by the two receiving antennas 21-1 to 21-2, and delays the signal received by one receiving antenna 21-2 by 4D in the delay unit 23-2. Thereafter, the receiving device adds the signal of the one receiving antenna 21-2 that has been subjected to the delay processing and the signal of the other receiving antenna 21-1 that has not been subjected to the delay processing by the adding unit 24. By giving such a delay amount, the timing of each main signal which is a solid line portion does not overlap in the output of the adder 24.
- the transmission apparatus independently gives a delay to signals transmitted from a plurality of transmission antennas so that the timing of the main signal does not overlap at the reception antenna.
- the receiving apparatus independently delays the signals received by the plurality of receiving antennas so that the timing of the main signal does not overlap at the time of addition.
- the demodulation unit of the receiving apparatus performs effective reception processing for multipath transmission, demodulation with a diversity effect is possible even if the signal after addition is directly input.
- the signals processed by the delay units 13-2 to 13-M and 23-2 to 23-N are not limited to analog signals or digital signals.
- the delay amount described in the embodiment and a considerable amount of delay processing are possible.
- the delay time of the signal transmitted from each antenna is different.
- the transmission delay time added at -3 is D respectively.
- the output of the return antenna shown in FIG. 4 is different between T 2 and T 3.
- the arrival time of the transmission path from the transmission antenna 15-3 to the reception antennas 21-1 and 21-2 is 4 is delayed by one sampling interval from the arrival time of the transmission path from 2 to the receiving antennas 21-1 and 21-2, the receiving antennas 21-1 and 21-2 are similar to the receiving antenna input shown in FIG. There is an effect that it becomes the timing of the main signal.
- the reception delay times are DM,..., DM (N-1), the reception delay times in the receiving apparatus are different, but added by delay units 23-2 and 23-3, for example. There may be the same reception delay time so that each transmission delay time is DM.
- the arrival time of the transmission path from the transmission antennas 15-1 to 15-M to the reception antenna 21-3 is DM more than the arrival time of the transmission path from the transmission antennas 15-1 to 15-M to the reception antenna 21-2.
- delay there is an effect that the input to the adder 24 has the same timing as the timing of the main signal described in the present embodiment.
- FIG. 5 is a diagram illustrating a configuration example of a transmission apparatus.
- the transmission device includes signal lines 12-1 to 12-M, delay units 13-2 to 13-M, modulation units 31-1 to 31-M, and transmission antennas 15-1 to 15-M.
- Modulating units 31-1 to 31-M modulate input data from signal line 12-1 and delayed input data from delay units 13-2 to 13-M. For example, this is effective when the output of the modulation unit is an analog signal and delay processing is difficult due to hardware limitations.
- Embodiment 2 FIG. In the present embodiment, a delay amount different from that of the first embodiment is given to the transmission device and the reception device. A different part from Embodiment 1 is demonstrated.
- FIG. 6 is a diagram illustrating a configuration example of a transmission apparatus.
- the transmission apparatus includes a modulation unit 11, signal lines 12-1 to 12-M, delay units 41-2 to 41-M, gain applying units 14-1 to 14-M, and transmission antennas 15-1 to 15-15. -M.
- the delay units 41-2 to 41-M perform delay processing on the transmission signal.
- FIG. 7 is a diagram illustrating a configuration example of a receiving device.
- the receiving device includes receiving antennas 21-1 to 21-N, gain applying units 22-1 to 22-N, delay units 51-2 to 51-N, an adding unit 24, and a demodulating unit 25. .
- the delay units 51-2 to 51-N perform delay processing on the received signal.
- the signal lines 12-2 to 12-M input the transmission signals to the delay units 41-2 to 41-M respectively connected thereto.
- DM (i ⁇ 1) is given in the delay unit 41-i (2 ⁇ i ⁇ M) using a certain fixed time D.
- the gain applying units 14-1 to 14-M receive the transmission signal from the signal line 12-1 and the delayed transmission signals from the delay units 41-2 to 41-M, and apply complex gain to each of them.
- the delay units 51-2 to 51-N receive the received signals from the gain applying units 22-2 to 22-N, and as an example of an appropriate delay amount for realizing the diversity effect, a certain fixed amount Using the time D, D (j ⁇ 1) is given in the delay unit 51-j (2 ⁇ j ⁇ N).
- FIG. 8 is a diagram illustrating stream composition.
- the transmission apparatus converts the signal output from the modulation unit 11 and the signals delayed by the delay amounts 2D, 4D, and 6D in the delay units 41-2 to 41-4 into four transmission antennas 15-1 to 15-4, respectively. Output from.
- the receiving apparatus receives four signals respectively by the two receiving antennas 21-2 to 21-2, and delays the signal received by one receiving antenna 21-2 by D in the delay unit 51-2. Thereafter, the receiving device adds the signal of the one receiving antenna 21-2 that has been subjected to the delay processing and the signal of the other receiving antenna 21-1 that has not been subjected to the delay processing by the adding unit 24. By giving such a delay amount, the timing of each main signal which is a solid line portion does not overlap in the output of the adder 24.
- the signals processed by the delay units 41-2 to 41-M and 51-2 to 51-N are not limited to analog signals or digital signals.
- the delay amount described in the above embodiment and a considerable delay time are possible.
- the delay amount considering the number of reception antennas of the reception apparatus is given. Even in such a method, the same effect as in the first embodiment can be obtained.
- Embodiment 3 the number of transmission antennas of the transmission device is LK, the number of outputs of the modulation unit is L, the number of reception antennas of the reception device is PQ, the number of inputs of the demodulation unit is P, and the modulation unit and the demodulation unit
- MIMO Multiple Input Multiple Output
- FIG. 9 is a diagram illustrating a configuration example of the transmission device.
- the transmission apparatus includes a modulation unit 61, signal lines 62-1 to 62-LK, delay units 63-2 to 63-K, 63-K + 2 to 63-K + K,..., 63- (L-1) K + 2 to 63. -LK, gain providing units 64-1 to 64-LK, and transmission antennas 65-1 to 65-LK.
- the modulation unit 61 generates a transmission signal.
- the signal lines 62-1 to 62-LK are signal lines that branch the transmission signal to the same number as the number of transmission antennas.
- the delay units 63-2 to 63-K, 63-K + 2 to 63-K + K,..., 63- (L ⁇ 1) K + 2 to 63-LK perform delay processing on the transmission signal.
- the gain assigning units 64-1 to 64-LK provide a complex gain to the transmission signal.
- the transmission antennas 65-1 to 65-LK transmit a transmission signal to the reception device. It can be said that the transmission apparatus includes L transmission blocks each including K transmission antennas.
- FIG. 10 is a diagram illustrating a configuration example of a receiving device.
- the receiving apparatus includes receiving antennas 71-1 to 71-PQ, gain applying units 72-1 to 72-PQ, delay units 73-2 to 73-Q, 73-Q + 2 to 73-Q + Q,. P-1) Q + 2 to 73-PQ, adders 74-1 to 74-P, and a demodulator 75.
- the reception antennas 71-1 to 71-PQ receive the reception signal from the transmission device.
- Gain assigning sections 72-1 to 72-PQ add a complex gain to the received signal.
- the delay units 73-2 to 73-Q, 73-Q + 2 to 73-Q + Q,..., 73- (P-1) Q + 2 to 73-PQ perform delay processing on the received signal.
- Adders 74-1 to 74-P add the received signals after delay.
- the demodulator 75 demodulates the received signal after the addition. It can be said that the reception apparatus includes P reception blocks each including Q reception antennas.
- the modulation unit 61 generates a transmission signal and outputs L series of signals. Further, each series of signals is branched into K signals to obtain LK series signals of the signal lines 62-1 to 62-LK.
- the signal lines 62-2 to 62-K,..., 62- (L-1) K + 2 to 62-LK are delay units 63-2 to 63-K,. -(L-1) Input to K + 2 to 63-LK.
- D (k) is used in delay unit 63-lK + k (0 ⁇ l ⁇ L ⁇ 1, 2 ⁇ k ⁇ K) using a certain fixed time D. -1) is given.
- the method of setting the delay amount for each transmission antenna is not limited to this.
- the gain imparting process here is arbitrary, and may not be performed if not necessary for obtaining the diversity effect.
- the position of -LK may be changed.
- the transmission antennas 65-1 to 65-LK transmit the transmission signals after the gain is applied from the gain applying units 64-1 to 64-LK to the receiving device.
- the receiving antennas 71-1 to 71-PQ input the received signals received to the gain applying units 72-1 to 72-PQ.
- the gain applying units 72-1 to 72-PQ perform complex gain application.
- the gain application process here is arbitrary, and may not be performed if it is not necessary for obtaining the diversity effect.
- Delay units 73-2 to 73-Q,..., 73- (P-1) Q + 2 to 73-PQ are connected to gain applying units 72-2 to 72-Q,..., 72- (P-1) Q + 2 to 72-
- a delay unit 73 ⁇ pQ + q (0 ⁇ p ⁇ P ⁇ 1, 2 ⁇ q ⁇ Q using a certain fixed time D) ) Gives DK (q-1).
- the method of setting the delay amount for each receiving antenna is not limited to this.
- Adders 74-1 to 74-P receive signals from gain applying units 72-1,..., 72- (P-1) Q + 1 and delay units 73-2 to 73-Q,. 1) The delayed received signals from Q + 2 to 73 ⁇ PQ are synthesized. Thereafter, the demodulator 75 demodulates the combined received signal.
- the method for assigning the delay amount is the same as in the first embodiment.
- the delay units 63-2 to 63-K, 63-K + 2 to 63-K + K,..., 63- (L-1) K + 2 to 63-LK, 73-2 to 73-Q, 73-Q + 2 73 ⁇ Q + Q,..., 73 ⁇ (P ⁇ 1) Q + 2 to 73 ⁇ PQ are not limited to analog signals or digital signals, but even analog signals are described in this embodiment. Delay amount and a considerable amount of delay processing are possible.
- the same delay as that in Embodiment 1 is given to each transmission block of the transmission device and each reception block of the reception device.
- the same effect as in the first embodiment can be obtained.
- the delay processing described in this embodiment equivalently increases the number of multipaths in the transmission path, it has the effect of reducing the spatial correlation between the transmission and reception branches, and reception and separation of spatially multiplexed signals during spatial multiplexing transmission. Performance can be increased.
- Embodiment 4 FIG.
- the transmission device and the reception device give a delay amount considering the signal delay in the multipath transmission path. A different part from Embodiment 1 is demonstrated.
- FIG. 11 is a diagram illustrating a configuration example of a transmission device.
- the transmission apparatus includes a modulation unit 11, signal lines 12-1 to 12-M, delay units 81-2 to 81-M, gain applying units 14-1 to 14-M, and transmission antennas 15-1 to 15-15. -M.
- the delay units 81-2 to 81-M perform delay processing on the transmission signal.
- FIG. 12 is a diagram illustrating a configuration example of a receiving device.
- the receiving device includes receiving antennas 21-1 to 21-N, gain applying units 22-1 to 22-N, delay units 91-2 to 91-N, an adding unit 24, and a demodulating unit 25. .
- the delay units 91-2 to 91-N perform delay processing on the received signal.
- the maximum delay amount of the incoming wave is D i . That is, D i is the arrival time of the arrival wave that reaches any one of the reception antennas 21-1 to 21-N earliest in the transmission path and the latest reception antenna 21-1 to 21-N in the transmission path. It represents the time difference from the arrival time of an incoming wave that reaches one of them.
- M (same as the number of transmission antennas) D i ′ satisfying “D i ′> D i ” are determined.
- the calculation of these delay amounts can be realized, for example, by estimating the transmission path by means of transmission path estimation using pilot symbols in the receiving apparatus and acquiring the delay profile by a method such as notifying the transmitting apparatus. is there.
- the delay units 81-2 to 81-M are expressed by the following equation (2) in the delay unit 81-i (2 ⁇ i ⁇ M) as an example of an appropriate delay amount for realizing the diversity effect. Give the amount of delay. That is, the delay unit 81-i (2 ⁇ i ⁇ M) gives the total delay amount from the delay units 81-1 to 81- (i-1).
- the gain applying units 14-1 to 14-M receive the transmission signal from the signal line 12-1 and the delayed transmission signals from the delay units 81-2 to 81-M, and apply complex gain to each of them. Note that the delay amount setting method for each transmission antenna is not limited to this.
- the delay units 91-2 to 91-N receive the received signals from the gain applying units 22-2 to 22-N, and as an example of an appropriate delay amount for realizing the diversity effect, the delay unit In 91-j (2 ⁇ j ⁇ N), a delay amount expressed by the following equation (3) is given. Note that the delay amount setting method for each reception antenna is not limited to this.
- FIG. 13 is a diagram for explaining stream composition.
- the transmission apparatus outputs the signal output from the modulation unit 11 and the signal delayed by the delay amount 2D in the delay unit 81-2 from the two transmission antennas 15-1 to 15-2, respectively.
- the receiving apparatus receives three signals respectively by the two receiving antennas 21-1 to 21-2, and delays the signal received by one receiving antenna 21-2 by 4D in the delay unit 91-2. Thereafter, the receiving device adds the signal of the one receiving antenna 21-2 that has been subjected to the delay processing and the signal of the other receiving antenna 21-1 that has not been subjected to the delay processing by the adding unit 24. By giving such a delay amount, the timing of each main signal which is a solid line portion does not overlap in the output of the adder 24.
- the signals processed by the delay units 81-2 to 81-M and 91-2 to 91-N are not limited to analog signals or digital signals.
- the delay amount described in the embodiment and a considerable amount of delay processing are possible.
- the transmitting apparatus gives a delay so that the timing of the main signal does not overlap at the receiving antenna even when the transmission signal passes through the multipath transmission path.
- the receiving apparatus delays the signals received by the plurality of receiving antennas so that the timing of the main signal does not overlap during addition. Thereby, the effect similar to Embodiment 1 can be acquired.
- Embodiment 5 FIG.
- the transmission device and the reception device give a delay amount considering the signal delay in the multipath transmission path. A different part from Embodiment 4 is demonstrated.
- the configurations of the transmission device and the reception device are the same as those in the fourth embodiment.
- the delay amount of the incoming wave that reaches any of the reception antennas 21-1 to 21-N earliest in the transmission path (transmission time and arrival time). the time difference) between the D i *.
- D i be the delay amount (the time difference between the transmission time and the arrival time) of the incoming wave that reaches the receiving antennas 21-1 to 21-N that is the latest in the transmission path.
- M (same as the number of transmitting antennas) D i ′ satisfying “D i ′> (D i ⁇ D i + 1 * )” are determined.
- the delay units 81-2 to 81-M are expressed by the above equation (2) in the delay unit 81-i (2 ⁇ i ⁇ M) as an example of an appropriate delay amount for realizing the diversity effect. Give the amount of delay.
- the delay units 91-2 to 91-N are expressed by the above equation (3) in the delay unit 91-j (2 ⁇ j ⁇ N) as an example of an appropriate delay amount for realizing the diversity effect. Give the amount of delay.
- the signals processed by the delay units 81-2 to 81-M and 91-2 to 91-N are not limited to analog signals or digital signals.
- the delay amount described in the embodiment and a considerable amount of delay processing are possible.
- the transmission apparatus when the transmission signal passes through the multipath transmission path, the transmission apparatus gives a delay in consideration of the delay of the leading wave in the transmission path. Thereby, compared with the fourth embodiment, the same effect can be obtained with a small amount of delay.
- Embodiment 6 FIG.
- a delay amount considering intersymbol interference is given in the transmission device and the reception device.
- a guard interval or a guard time widely used in multicarrier communication such as OFDM (Orthogonal Frequency Division Multiplexing) is added to the head of the modulation symbol. Assumes that. A different part from Embodiment 1 is demonstrated.
- FIG. 14 is a diagram illustrating a configuration example of a transmission device.
- the transmission apparatus includes a modulation unit 11, signal lines 12-1 to 12-M, a delay amount control unit 101, delay units 102-2 to 102-M, gain applying units 14-1 to 14-M, Transmitting antennas 15-1 to 15-M.
- the delay amount control unit 101 controls the delay amount of each delay unit.
- the delay units 102-2 to 102-M perform delay processing on the transmission signal.
- FIG. 15 is a diagram illustrating a configuration example of a receiving device.
- the receiving apparatus includes receiving antennas 21-1 to 21-N, gain applying units 22-1 to 22-N, a delay amount control unit 111, delay units 112-2 to 112-N, an adding unit 24, And a demodulator 25.
- the delay amount control unit 111 controls the delay amount of each delay unit.
- the delay units 112-2 to 112-N perform delay processing on the received signal.
- the length of the guard interval or guard time is G_len, and the arrival time of the leading wave that arrives at any of the reception antennas 21-1 to 21-N earliest in all transmission paths and the latest in all transmission paths.
- the delay amount control unit 101 sets “G_len ⁇ D_len + D (MN ⁇ 1)”. D is determined to satisfy Further, the delay units 102-2 to 102-M give D (i ⁇ 1) in the delay unit 102-i (2 ⁇ i ⁇ M) as an example of an appropriate delay amount for realizing the diversity effect.
- the calculation of these delay amounts can be realized, for example, by estimating the transmission path by means of transmission path estimation using pilot symbols in the receiving apparatus and acquiring the delay profile by a method such as notifying the transmitting apparatus. is there.
- the delay amount control unit 111 determines the delay amount by the same method as the delay amount control unit 101. Further, the delay units 112-2 to 112-N give DM (j ⁇ 1) in the delay unit 112-j (2 ⁇ j ⁇ N) as an example of an appropriate delay amount for realizing the diversity effect.
- the signals processed by the delay units 102-2 to 102-M and 1122-2 to 112-N are not limited to analog signals or digital signals.
- the delay amount described in the embodiment and a considerable amount of delay processing are possible.
- the transmission apparatus gives a delay so that the transmission signal does not interfere with the intersymbol at the reception antenna.
- the receiving apparatus delays signals received by a plurality of receiving antennas so as not to cause intersymbol interference at the time of addition. Thereby, the effect similar to Embodiment 1 can be acquired.
- Embodiment 7 FIG. In the present embodiment, a delay amount considering intersymbol interference is given in the transmission device and the reception device. A different part from Embodiment 6 is demonstrated.
- FIG. 16 is a diagram illustrating a configuration example of a transmission device.
- the transmission apparatus includes a modulation unit 11, signal lines 12-1 to 12-M, a delay amount control unit 121, delay units 122-2 to 122-M, gain applying units 14-1 to 14-M, Transmitting antennas 15-1 to 15-M.
- the delay amount control unit 121 controls the delay amount of each delay unit.
- the delay units 122-2 to 122-M perform delay processing on the transmission signal.
- FIG. 17 is a diagram illustrating a configuration example of a receiving device.
- the receiving apparatus includes receiving antennas 21-1 to 21-N, gain applying units 22-1 to 22-N, a delay amount control unit 131, delay units 132-2 to 132-N, an adding unit 24, And a demodulator 25.
- the delay amount control unit 131 controls the delay amount of each delay unit.
- the delay units 132-2 to 132-N perform delay processing on the received signal.
- the delay amount of the wave that reaches the receiving antennas 21-1 to 21-N latest Is D i .
- the length of the guard interval or guard time is G_len
- the receiving apparatus estimates the transmission path using pilot symbols and the like, Delay profile It can be achieved by obtaining the Le.
- the delay units 122-2 to 122-M have the delay amount control unit 121 in the delay unit 122-i (2 ⁇ i ⁇ M) as an example of an appropriate delay amount for realizing the diversity effect.
- a delay amount expressed by the above equation (2) is given.
- the gain applying units 14-1 to 14-M receive the transmission signal from the signal line 12-1 and the delayed transmission signals from the delay units 122-2 to 122-M, and apply a complex gain to each of them.
- the delay units 132-2 to 132-N are expressed by the above equation (3) in the delay unit 132-j (2 ⁇ j ⁇ N) as an example of an appropriate delay amount for realizing the diversity effect. Give the amount of delay.
- the signals processed by the delay units 122-2 to 122-M and 132-2 to 132-N are not limited to analog signals or digital signals.
- the delay amount described in the embodiment and a considerable amount of delay processing are possible.
- the transmitting apparatus and the receiving apparatus give a delay so that a signal exceeding a predetermined reception power does not interfere with the intersymbol, so that the reception apparatus mainly exceeds the predetermined reception power. It was decided that signals could be added without overlapping in time. Thereby, the effect similar to Embodiment 1 can be acquired.
- Embodiment 8 FIG. In this embodiment, an antenna that performs delay processing is selected in the transmission device and the reception device. A different part from Embodiment 1 is demonstrated.
- FIG. 18 is a diagram illustrating a configuration example of a transmission device.
- the transmission apparatus includes a modulation unit 11, signal lines 12-1, 18-1 to 18-M, a transmission antenna selection unit 17, delay units 141-2 to 141-M, and gain applying units 14-1 to 14-14. -M and transmitting antennas 15-1 to 15-M.
- the transmission antenna selection unit 17 selects an antenna to be actually transmitted from antenna candidates 15-2 to 15-M for transmitting a signal after delay processing.
- the delay units 141-2 to 141-M perform delay processing on the transmission signal.
- FIG. 19 is a diagram illustrating a configuration example of a receiving device.
- the receiving apparatus includes receiving antennas 21-1 to 21-N, gain applying units 22-1 to 22-N, delay units 142-2 to 142-N, a receiving antenna selecting unit 27, an adding unit 24, And a demodulator 25.
- the reception antenna selection unit 27 selects an antenna that is actually combined with the signal received by the reception antenna 21-1 from the reception antenna candidates 21-2 to 21-N.
- the delay units 142-2 to 142-N perform delay processing on the received signal.
- the transmission signal generated by the modulation unit 11 is branched to the signal lines 12-1 and 18-1.
- the signal branched to the signal line 12-1 is processed in the same manner as in the first embodiment and transmitted from the transmission antenna 15-1.
- the signal branched to the signal line 18-1 is input to the transmission antenna selection unit 17.
- the transmission antenna selection unit 17 selects an antenna from the transmission antennas 15-2 to 15-M, and connects to a signal line corresponding to the selected antenna.
- selecting an antenna having the highest transmission path gain can be cited.
- the transmission channel gain can be calculated by the transmission antenna selection unit 17 switching the transmission antenna and estimating the transmission channel in a transmission channel estimation period using pilot symbols.
- the transmission antenna selection unit 17 first selects the transmission antenna 15-2, performs transmission channel estimation in the reception device, obtains transmission channel gain, and feeds back to the transmission device.
- the transmission antenna 15-3 is selected, the transmission apparatus estimates the transmission path at the reception apparatus 17 and the transmission path gain is obtained and fed back to the transmission apparatus.
- the delay unit 141-i gives a delay to the signal input from the signal line 18-i.
- the amount of delay given here is determined by any one of the first to seventh embodiments.
- the gain applying units 14-1 and 14-i the transmission signal from the signal line 12-1 and the delayed transmission signal from the delay unit 141-i are input, and a complex gain is applied to each of them.
- the reception antenna selection unit 27 selects an antenna from the reception antennas 21-2 to 21-N, and connects the signal line corresponding to the selected antenna and the addition unit 24.
- the criteria for selecting the antenna include selecting the antenna having the highest transmission line gain, as in the selection criteria in the transmission antenna selection unit 17. For example, in the transmission channel estimation period, the reception antenna selection unit 27 first selects the reception antenna 21-2 to perform transmission channel estimation to obtain a transmission channel gain, and the reception antenna selection unit 27 then receives the reception antenna 21- 3 is selected to estimate the transmission line gain. By performing the above procedure for the receiving antennas 21-2 to 21-N, the transmission path gain can be obtained for all combinations of the receiving antennas.
- the delay unit 142-j gives a delay to the signal input from the gain applying unit 22-j.
- the amount of delay given here is determined by any one of the first to seventh embodiments.
- the adder 24 combines the received signal from the gain applying unit 22-1 and the delayed received signal from the delay unit 142-j.
- the transmission apparatus selects a transmission antenna that performs delay processing
- the reception apparatus selects a reception antenna that performs delay processing.
- Embodiment 9 FIG. In the present embodiment, an antenna used for transmission and reception is selected in the transmission device and the reception device. A different part from Embodiment 8 is demonstrated.
- FIG. 20 is a diagram illustrating a configuration example of a transmission device.
- the transmission apparatus includes a modulation unit 11, a selection branching unit 19, signal lines 151-1 to 151-M, delay units 161-1 to 161-M, gain applying units 14-1 to 14-M, transmission Antennas 15-1 to 15-M.
- the selection branching unit 19 selects an antenna to be actually transmitted from the antenna candidates 15-1 to 15-M for transmitting signals.
- the delay units 161-1 to 161-M perform delay processing on the transmission signal.
- FIG. 21 is a diagram illustrating a configuration example of a receiving device.
- the receiving apparatus selects receiving antennas 21-1 to 21-N, gain applying units 22-1 to 22-N, delay units 162-1 to 162-N, and signal lines 152-1 to 152-N.
- a combining unit 29 and a demodulating unit 25 are provided.
- the selection combining unit 29 selects an antenna to be combined from the receiving antenna candidates 21-1 to 21-N.
- Delay units 162-1 to 162-N perform delay processing on the received signal.
- the transmission signal generated by the modulation unit 11 is branched by the selection branching unit 19.
- the selection / branching unit 19 selects one or more antennas from the transmission antennas 15-1 to 15-M.
- the transmission path gain at each antenna selection is determined and ranked, and antennas with higher transmission path gains under the condition of the specified number of antennas or less are selected in order from the top of the ranking, or the specified total
- antennas are selected in order from the top of the ranking under the condition that satisfies the transmission line gain, and the number of antennas is suppressed to the minimum.
- the selected transmission antennas are assumed to be 15-i, 15-j, 15-k (1 ⁇ i, j, k ⁇ M, i ⁇ j, j ⁇ k, k ⁇ i).
- the selection branching unit 19 branches the signal to the signal lines 151-i, 151-j, 151-k.
- the delay units 161-i, 161-j, 161-k give a delay to the input signal. The amount of delay given here is determined by any one of the embodiments 1 to 7, but in order to keep the total amount of delay to a minimum amount, no delay is given to one of the selected antennas. A relative delay amount may be set for other antennas.
- the gain assigning units 14-i, 14-j, and 14-k receive the delayed transmission signals from the delay units 161-i, 161-j, and 161-k, and assign complex gains to them.
- the selection / combination unit 29 selects an antenna from the reception antennas 21-1 to 21 -N, adds the reception signals from the signal line corresponding to the selected antenna, and outputs the result to the demodulation unit 25.
- the criterion for selecting the antenna is the same as the selection criterion in the selective branching unit 19.
- the selection / combination unit 29 combines the reception signals from the delay units 162-l and 162-m.
- the transmitting apparatus selects the transmitting antenna to be branched, and the receiving apparatus selects the receiving antenna that combines the signals.
- communication performance can be improved efficiently by selecting an antenna having a high transmission line gain.
- the number of antennas actually used and the related circuits can be reduced to the minimum number, and the power consumption of the unused antennas and related circuits can be reduced.
- Embodiment 10 FIG.
- the number of transmission antennas of the transmission device is LK
- the number of outputs of the modulation unit is L
- the number of reception antennas of the reception device is PQ
- the number of inputs of the demodulation unit is P
- the modulation unit and the demodulation unit A wireless communication system that performs MIMO spatial multiplexing transmission will be described. A different part from Embodiment 3 is demonstrated.
- FIG. 22 is a diagram illustrating a configuration example of a transmission device.
- the transmission apparatus includes a modulation unit 61, selective branching units 69-1 to 69-L, signal lines 171-1 to 171-LK, delay units 181-1 to 181-LK, and gain applying units 64-1 to 64-1. 64-LK and transmission antennas 65-1 to 65-LK.
- the selection branching unit 69-l (1 ⁇ l ⁇ L) selects an antenna to be actually transmitted from the antenna candidates for transmitting signals 65- (l ⁇ 1) K + 1 to 65-lK, and the signal line 171- (l -1) Connect to the signal line corresponding to the selected antenna from K + 1 to 171-1K.
- the delay units 181-1 to 181-LK perform delay processing on the transmission signal.
- FIG. 23 is a diagram illustrating a configuration example of a receiving device.
- the receiving apparatus selects receiving antennas 71-1 to 71-PQ, gain applying units 72-1 to 72-PQ, delay units 182-1 to 182-PQ, and signal lines 172-1 to 172-PQ. Combining units 79-1 to 79-P and a demodulating unit 75 are provided. Delay units 182-1 to 182-PQ perform delay processing on the received signal.
- the selection combining unit 79-p (1 ⁇ p ⁇ P) selects the antenna to be actually combined from the antenna candidates 71- (p ⁇ 1) Q + 1 to 71-pQ for combining signals, and the signal line 172- (p -1) From Q + 1 to 171-pQ, connect to the signal line corresponding to the selected antenna.
- L signal sequences are generated by the modulation unit 61.
- the l-th (1 ⁇ l ⁇ L) signal sequence will be described. The following description is common to all L transmission blocks, and operates independently for L transmission blocks.
- the l-th signal series is input to the selection branching unit 69-l.
- the processing of the selection branching unit 69-l is the same as that in the ninth embodiment.
- the spatial correlation with the antennas selected by other selective branching units 69-1 to 69-1-1 and 69-l + 1 to 69-L is low. And selecting an antenna that increases the transmission path capacity.
- the spatial correlation and the transmission path capacity can be calculated by the transmission selection branching unit 69-1 switching the transmission antenna and estimating the transmission path in a transmission path estimation period using pilot symbols.
- the selected transmitting antenna is 65- (l-1) K + i, 65- (l-1) K + j, 65- (l-1) K + k (1 ⁇ i, j, k ⁇ K, i ⁇ j, j ⁇ k , K ⁇ i).
- the selection branching unit 69-l branches the signal to the signal lines 171 ⁇ (l ⁇ 1) K + i, 171 ⁇ (l ⁇ 1) K + j, and 171 ⁇ (l ⁇ 1) K + k.
- the delay units 181- (l ⁇ 1) K + i, 181 ⁇ (l ⁇ 1) K + j, and 181 ⁇ (l ⁇ 1) K + k give a delay to the input signal.
- the amount of delay given here is determined by any one of the embodiments 1 to 7, but in order to keep the total amount of delay to a minimum amount, no delay is given to one of the selected antennas.
- a relative delay amount may be set for other antennas.
- P received signal sequences are input to the demodulator 75.
- the p-th (1 ⁇ p ⁇ P) signal sequence will be described. The following description is common to all P received blocks and operates independently of P.
- the selection / combination unit 79-p (1 ⁇ p ⁇ P) selects the antenna from the reception antennas 71- (p ⁇ 1) Q + 1 to 71-pQ, and adds the reception signals from the signal lines corresponding to the selected antennas.
- the criterion for selecting the antenna is the same as the selection criterion in the selection branching unit 69-1 (1 ⁇ l ⁇ L).
- the selected reception antenna is 71 ⁇ (p ⁇ 1) Q + 1, 71 ⁇ (p ⁇ 1) Q + m (1 ⁇ l, m ⁇ Q, l ⁇ m).
- the signal lines 172- (p ⁇ 1) Q + 1 and 172 ⁇ (p ⁇ 1) Q + m are connected to the selection combining unit 79-p.
- the delay units 182- (p-1) Q + 1 and 182- (p-1) Q + m give a delay to the signals input from the gain applying units 72- (p-1) Q + 1 and 72- (p-1) Q + m.
- the amount of delay given here is determined by any one of the embodiments 1 to 7, but in order to keep the total amount of delay to a minimum amount, no delay is given to one of the selected antennas.
- a relative delay amount may be set for other antennas.
- the selection combining unit 79-p combines the reception signals from the delay units 182- (p-1) Q + 1 and 182- (p-1) Q + m.
- the same processing as in the ninth embodiment is performed for each transmission block of the transmission device and each reception block of the reception device.
- the antenna selection criterion described in this embodiment acts to reduce the spatial correlation between the transmission and reception branches or increase the transmission path capacity, it improves the reception separation performance of the spatial multiplexing signal during spatial multiplexing transmission. Can do.
- the wireless communication system according to the present invention is useful for communication using a plurality of antennas, and is particularly suitable when a plurality of antennas are used for transmission and reception.
- Delay unit 24 Addition unit 25 Demodulation unit 27 Reception antenna selection unit 29 Selective combination unit 31-1,..., 31-M Modulation unit 41-2, ..., 41-M Delay unit 51-2, ..., 51-N 61-modulator 62-1,..., 62-LK signal line 63-2,..., 63-K, ..., 63- (L-1) K + 2, ..., 63-LK delay unit 64-1,.
Abstract
Description
本実施の形態では、送信装置の送信アンテナ数をM本、空間多重数を1とし、受信装置の受信アンテナ数をN本、空間多重数を1として、変調部および復調部ではマルチパス伝送対策を行っている無線通信システムについて説明する。
本実施の形態では、送信装置および受信装置において、実施の形態1と異なる遅延量を付与する。実施の形態1と異なる部分について説明する。
本実施の形態では、送信装置の送信アンテナ数をLK本、変調部の出力数をLとし、受信装置の受信アンテナ数をPQ本、復調部の入力数をPとして、変調部および復調部ではMIMO(Multiple Input Multiple Output)空間多重伝送を行い、受信装置では周波数領域での復調処理を行う無線通信システムについて説明する。実施の形態1と異なる部分について説明する。
本実施の形態では、送信装置および受信装置において、マルチパス伝送路における信号の遅延を考慮した遅延量を付与する。実施の形態1と異なる部分について説明する。
本実施の形態では、送信装置および受信装置において、マルチパス伝送路における信号の遅延を考慮した遅延量を付与する。実施の形態4と異なる部分について説明する。
本実施の形態では、送信装置および受信装置において、符号間干渉を考慮した遅延量を付与する。ここでは、伝送路の遅延波による符号間干渉に対応するため、変調シンボルの先頭には、OFDM(Orthogonal Frequency Division Multiplexing)等のマルチキャリア通信で広く用いられる、ガードインターバルまたはガードタイムが付加されることを想定している。実施の形態1と異なる部分について説明する。
本実施の形態では、送信装置および受信装置において、符号間干渉を考慮した遅延量を付与する。実施の形態6と異なる部分について説明する。
本実施の形態では、送信装置および受信装置において、遅延処理を行うアンテナを選択する。実施の形態1と異なる部分について説明する。
本実施の形態では、送信装置および受信装置において、送信および受信に使用するアンテナを選択する。実施の形態8と異なる部分について説明する。
本実施の形態では、送信装置の送信アンテナ数をLK本、変調部の出力数をLとし、受信装置の受信アンテナ数をPQ本、復調部の入力数をPとして、変調部および復調部ではMIMO空間多重伝送を行う無線通信システムについて説明する。実施の形態3と異なる部分について説明する。
12-1、…、12-M 信号線
13-2、…、13-M 遅延部
14-1、…、14-M 利得付与部
15-1、…、15-M 送信アンテナ
17 送信アンテナ選択部
18-1、…、18-M 信号線
19 選択分岐部
21-1、…、21-N 受信アンテナ
22-1、…、22-N 利得付与部
23-2、…、23-N 遅延部
24 加算部
25 復調部
27 受信アンテナ選択部
29 選択合成部
31-1、…、31-M 変調部
41-2、…、41-M 遅延部
51-2、…、51-N 遅延部
61 変調部
62-1、…、62-LK 信号線
63-2、…、63-K、…、63-(L-1)K+2、…、63-LK 遅延部
64-1、…、64-LK 利得付与部
65-1、…、65-LK 送信アンテナ
69-1、…、69-L 選択分岐部
71-1、…、71-PQ 受信アンテナ
72-1、…、72-PQ 利得付与部
73-2、…、73-Q、…、73-(P-1)Q+2、…、73-PQ 遅延部
74-1、…、74-P 加算部
75 復調部
79-1、…、79-P 選択合成部
81-2、…、81-M 遅延部
91-2、…、91-N 遅延部
101 遅延量制御部
102-2、…、102-M 遅延部
111 遅延量制御部
112-2、…、112-N 遅延部
121 遅延量制御部
122-2、…、122-M 遅延部
131 遅延量制御部
132-2、…、132-N 遅延部
141-2、…、141-M 遅延部
142-2、…、142-N 遅延部
151-1、…、151-M 信号線
152-1、…、152-N 信号線
161-1、…、161-M 遅延部
162-1、…、162-N 遅延部
171-1、…、171-LK 信号線
172-1、…、172-PQ 信号線
181-1、…、181-LK 遅延部
182-1、…、182-PQ 遅延部
Claims (28)
- 複数の送信アンテナを備える送信装置と、複数の受信アンテナを備える受信装置と、から構成される無線通信システムであって、
前記送信装置は、
信号を複数の前記送信アンテナに対応した複数の信号路を通る複数の送信信号に分岐する分岐手段と、
前記信号路の少なくとも1つに設けられ送信信号に遅延を付加する送信遅延手段と、
を備え、
前記分岐手段により分岐された送信信号が前記送信遅延手段により遅延を付加された場合は該遅延を付加された送信信号を送信信号とし、前記各送信信号を前記複数の送信アンテナを介して前記受信装置へ送信し、
前記受信装置は、
前記複数の受信アンテナで受信した複数の受信信号を通す複数の信号路の少なくとも1つに設けられ受信信号に遅延を付加する受信遅延手段と、
前記受信信号が前記受信遅延手段により遅延を付加された場合は該遅延を付加された受信信号を受信信号とし、前記各受信信号を加算する加算手段と、
を備える
ことを特徴とする無線通信システム。 - 前記送信遅延手段が複数ある場合、前記送信遅延手段のうちの少なくとも2つが送信信号に付加する遅延量は異なる
ことを特徴とする請求項1に記載の無線通信システム。 - 前記受信遅延手段が複数ある場合、前記受信遅延手段のうちの少なくとも2つが受信信号に付加する遅延量は異なる
ことを特徴とする請求項1に記載の無線通信システム。 - 前記複数の送信アンテナの一部は選択された場合に送信信号を送信する選択送信アンテナであり、前記選択送信アンテナから送信信号の送信に使用する送信アンテナを選択し、前記分岐手段により分岐された送信信号を前記選択された送信アンテナに対応する信号路に出力する送信アンテナ選択手段を備える
ことを特徴とする請求項1に記載の無線通信システム。 - 前記複数の受信アンテナの一部は選択された場合に受信信号を受信する被選択受信アンテナであり、前記被選択受信アンテナから受信信号の受信に使用する受信アンテナを選択し、前記選択された受信アンテナで受信した受信信号を前記加算手段に出力する受信アンテナ選択手段を備える
ことを特徴とする請求項1に記載の無線通信システム。 - 前記分岐手段は、前記複数の送信アンテナの中から送信信号の送信に使用する送信アンテナを選択し、前記選択された送信アンテナに対応する信号路に対して送信信号を分岐する
ことを特徴とする請求項1に記載の無線通信システム。 - 前記加算手段は、前記複数の受信アンテナから受信信号の受信に使用する受信アンテナを選択し、前記選択された受信アンテナで受信された受信信号を加算する
ことを特徴とする請求項1に記載の無線通信システム。 - 複数の送信アンテナを備える送信装置と、複数の受信アンテナを備える受信装置と、から構成される無線通信システムであって、
前記送信装置は、
前記送信アンテナの数よりも小さい複数の系列の信号を出力する信号生成手段と、
前記信号生成手段から出力された各系列の信号に対応し1以上の送信アンテナを含む複数の送信ブロックからなり、
1の前記送信ブロックは、
当該ブロックに対応する系列の信号を、当該ブロックが備える送信アンテナに対応した複数の信号路を通る複数の送信信号に分岐する分岐手段と、
前記信号路の少なくとも1つに設けられ送信信号に遅延を付加する送信遅延手段と、
を備え、
前記分岐手段により分岐された送信信号が前記送信遅延手段により遅延を付加された場合は該遅延を付加された送信信号を送信信号とし、前記各送信信号を当該送信ブロックが備える送信アンテナを介して前記受信装置へ送信し、
前記受信装置は、
1以上の受信アンテナを含む複数の受信ブロックからなり、
前記受信ブロックにそれぞれ対応する入力端子を備え、前記各入力端子から入力された受信信号を復調する復調手段、
を備え、
1の前記受信ブロックは、
当該受信ブロックが備える受信アンテナで受信した受信信号を通す信号路の少なくとも1つに設けられ受信信号に遅延を付加する受信遅延手段と、
前記受信信号が前記受信遅延手段により遅延を付加された場合は該遅延を付加された受信信号を受信信号とし、前記受信信号を加算して前記復調手段へ出力する加算手段と、
を備える
ことを特徴とする無線通信システム。 - 1の前記送信ブロック内に前記送信遅延手段が複数ある場合、前記送信遅延手段のうちの少なくとも2つが送信信号に付加する遅延量は異なる
ことを特徴とする請求項8に記載の無線通信システム。 - 1の前記受信ブロック内に前記受信遅延手段が複数ある場合、前記受信遅延手段のうちの少なくとも2つが受信信号に付加する遅延量は異なる
ことを特徴とする請求項8に記載の無線通信システム。 - 前記1の送信ブロックの分岐手段は、当該送信ブロックに含まれる送信アンテナの中から送信信号の送信に使用する送信アンテナを選択し、前記選択された送信アンテナに対応する信号路に対して送信信号を分岐する
ことを特徴とする請求項8に記載の無線通信システム。 - 前記1の受信ブロックの加算手段は、当該受信ブロックに含まれる受信アンテナの中から受信信号の受信に使用する受信アンテナを選択し、前記選択された受信アンテナに対応する受信信号を加算する
ことを特徴とする請求項8に記載の無線通信システム。 - 前記送信遅延手段が前記送信信号に付加する遅延量と、前記受信遅延手段が前記受信信号に付加する遅延量は、前記送信装置と受信装置の間の伝送遅延量に基づいて決定される
ことを特徴とする請求項1または請求項8に記載の無線通信システム。 - 前記送信遅延手段が前記送信信号に付加する遅延量と、前記受信遅延手段が前記受信信号に付加する遅延量は、前記送信装置と受信装置の間の伝送遅延量と前記受信装置における受信電力に基づいて決定される
ことを特徴とする請求項1または請求項8に記載の無線通信システム。 - 複数の受信アンテナを備える受信装置と無線通信システムを構成する、複数の送信アンテナを備える送信装置であって、
前記送信アンテナの数よりも小さい複数の系列の信号を出力する信号生成手段と、
前記信号生成手段から出力された各系列の信号に対応し1以上の送信アンテナを含む複数の送信ブロックからなり、
1の前記送信ブロックは、
当該ブロックに対応する系列の信号を、当該ブロックが備える送信アンテナに対応した複数の信号路を通る複数の送信信号に分岐する分岐手段と、
前記信号路の少なくとも1つに設けられ送信信号に遅延を付加する送信遅延手段と、
を備え、
前記分岐手段により分岐された送信信号が前記送信遅延手段により遅延を付加された場合は該遅延を付加された送信信号を送信信号とし、前記各送信信号を当該送信ブロックが備える送信アンテナを介して前記受信装置へ送信する
ことを特徴とする送信装置。 - 1の前記送信ブロック内に前記送信遅延手段が複数ある場合、前記送信遅延手段のうちの少なくとも2つが送信信号に付加する遅延量は異なる
ことを特徴とする請求項15に記載の送信装置。 - 前記1の送信ブロックの分岐手段は、当該送信ブロックに含まれる送信アンテナの中から送信信号の送信に使用する送信アンテナを選択し、前記選択された送信アンテナに対応する信号路に対して送信信号を分岐する
ことを特徴とする請求項15に記載の送信装置。 - 前記送信遅延手段は、前記送信信号に付加する遅延量を、自装置と前記受信装置の間の伝送遅延量に基づいて決定する
ことを特徴とする請求項15に記載の送信装置。 - 前記送信遅延手段は、前記送信信号に付加する遅延量を、自装置と前記受信装置の間の伝送遅延量、および当該受信装置における受信電力に基づいて決定する
ことを特徴とする請求項15に記載の送信装置。 - 複数の送信アンテナを備える送信装置と無線通信システムを構成する、複数の受信アンテナを備える受信装置であって、
前記複数の受信アンテナで受信した複数の受信信号を通す複数の信号路の少なくとも1つに設けられ受信信号に遅延を付加する受信遅延手段と、
前記受信信号が前記受信遅延手段により遅延を付加された場合は該遅延を付加された受信信号を受信信号とし、前記各受信信号を加算する加算手段と、
を備えることを特徴とする受信装置。 - 前記受信遅延手段が複数ある場合、前記受信遅延手段のうちの少なくとも2つが受信信号に付加する遅延量は異なる
ことを特徴とする請求項20に記載の受信装置。 - 前記複数の受信アンテナの一部は選択された場合に受信信号を受信する被選択受信アンテナであり、前記被選択受信アンテナから受信信号の受信に使用する受信アンテナを選択し、前記選択された受信アンテナで受信した受信信号を前記加算手段に出力する受信アンテナ選択手段を備える
ことを特徴とする請求項20に記載の受信装置。 - 前記加算手段は、前記複数の受信アンテナから受信信号の受信に使用する受信アンテナを選択し、前記選択された受信アンテナで受信された受信信号を加算する
ことを特徴とする請求項20に記載の受信装置。 - 複数の送信アンテナを備える送信装置と無線通信システムを構成する、複数の受信アンテナを備える受信装置であって、
1以上の受信アンテナを含む複数の受信ブロックからなり、
前記受信ブロックにそれぞれ対応する入力端子を備え、前記各入力端子から入力された受信信号を復調する復調手段、
を備え、
1の前記受信ブロックは、
当該受信ブロックが備える受信アンテナで受信した受信信号を通す信号路の少なくとも1つに設けられ受信信号に遅延を付加する受信遅延手段と、
前記受信信号が前記受信遅延手段により遅延を付加された場合は該遅延を付加された受信信号を受信信号とし、前記受信信号を加算して前記復調手段へ出力する加算手段と、
を備える
ことを特徴とする受信装置。 - 1の前記受信ブロック内に前記受信遅延手段が複数ある場合、前記受信遅延手段のうちの少なくとも2つが受信信号に付加する遅延量は異なる
ことを特徴とする請求項24に記載の受信装置。 - 前記1の受信ブロックの加算手段は、当該受信ブロックに含まれる受信アンテナの中から受信信号の受信に使用する受信アンテナを選択し、前記選択された受信アンテナに対応する受信信号を加算する
ことを特徴とする請求項24に記載の受信装置。 - 前記受信遅延手段は、前記受信信号に付加する遅延量を、前記送信装置と自装置の間の伝送遅延量に基づいて決定する
ことを特徴とする請求項24に記載の受信装置。 - 前記受信遅延手段は、前記受信信号に付加する遅延量を、前記送信装置と自装置の間の伝送遅延量、および自装置における受信電力に基づいて決定する
ことを特徴とする請求項24に記載の受信装置。
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JPWO2015053110A1 (ja) * | 2013-10-10 | 2017-03-09 | ソニー株式会社 | 受信装置、受信方法、並びにプログラム |
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US8824446B2 (en) | 2014-09-02 |
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