WO2006022372A1 - 無線送信機および無線受信機 - Google Patents
無線送信機および無線受信機 Download PDFInfo
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- WO2006022372A1 WO2006022372A1 PCT/JP2005/015540 JP2005015540W WO2006022372A1 WO 2006022372 A1 WO2006022372 A1 WO 2006022372A1 JP 2005015540 W JP2005015540 W JP 2005015540W WO 2006022372 A1 WO2006022372 A1 WO 2006022372A1
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- Prior art keywords
- transmission
- antennas
- selection
- selection index
- combination
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Classifications
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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
- H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
- H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit 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
- H04B7/0413—MIMO systems
Definitions
- the present invention is a wireless transmitter for simultaneously transmitting information from a plurality of transmission antennas using a plurality of transmission antennas, wherein a combination of at least one transmission antenna is combined from the plurality of transmission antennas.
- the present invention relates to a radio transmitter that selects and transmits information using the selected transmission antenna, and a radio receiver that receives a transmission signal transmitted from the radio transmitter.
- the present invention relates to a wireless transmitter and a wireless receiver that perform a carrier communication such as OFDM (Orthogonal Frequency Division Multiplexing).
- MIMO multi-input multi-output
- SINR Signal to Interference plus Noise Ratio
- Patent Document 1 Japanese Patent Laid-Open No. 11-205205
- Patent Document 2 Japanese Patent Laid-Open No. 2000-209145
- Patent Document 3 Japanese Patent Laid-Open No. 2003-249882
- Non-Patent Document 1 Akira Taira, Yoshitaka Hara, Fumio Ishiri, Koji Murakami, Kenji Sudo, Tomoaki Otsuki, "MIMO-OFDM system transmission characteristics when selecting transmission channel", IEICE Technical Report RCS2003- 263 p 115—120, 2003
- Non-Patent Document 2 Kenji Sudo, Yoshitaka Hara, Tomoaki Ohtsuki, “Throughput Maximized Transmission Control Method in MIMO Systems”, 2003 IEICE Communication Society B— 5— 12 p. 389
- Non-Patent Document 3 Tokitsu, Tetsushi Abe, Shigeru Sato, Hiroto Suda, “Transmission antenna selection type MIMO channel transmission system for optimal power allocation”, 2003 IEICE General Conference B-5- 163 p. 622
- Non-Patent Document 4 Kenji Sudo, Yoshitaka Hara, Tomoaki Ohtsuki “Throughput Maximized Transmission Control Method in MIMO Systems”, IEICE Technical Report RCS2003—209 p. 133—138, 2003
- the error rate may not be improved by simply reducing the number of inter-division multiplexing and simply reducing the number of transmit antennas used. If a combination of transmit antennas that forms a propagation channel due to an increase in errors is selected from multiple transmit antennas, the correlation of the propagation channels remains high and the error rate is improved. Not.
- the wireless transmitter includes a plurality of transmission antennas and communication is not started using all the transmission antennas, but communication is started using some of the transmission antennas. It is possible to improve the error rate by selecting a combination of transmission antennas having a smaller correlation between propagation channels formed by, and performing communication using space division multiplexing and transmission diversity.
- the conventional technology does not assume power mainly as a single carrier system, and does not sufficiently support a multicarrier system such as OFDM using a plurality of carriers.
- the optimum transmission antenna may differ from subcarrier to subcarrier because the propagation channel conditions received and the reception conditions vary from subcarrier to subcarrier.
- the effect of frequency selective fading increases and the difference in propagation path conditions between subcarriers increases.
- the difference in transmission path conditions between subcarriers with different frequency positions increases.
- an object of the present invention is to provide a radio transmitter capable of realizing good radio communication and a radio receiver that receives a transmission signal transmitted from the radio transmitter.
- the wireless transmitter acquires propagation path response information indicating a propagation path response formed by a plurality of transmission antennas that can transmit a radio signal, and each of the transmission antennas and a receiving antenna of a communication partner.
- a selection index value serving as a reference for selecting the transmission antenna combination from the acquired propagation path response information and selecting the transmission antenna combination based on the selection index value
- a selection control unit for transmitting a radio signal by a combination of the selected transmission antennas.
- a combination of transmission antennas is selected based on the selection index value, a combination of transmission antennas is selected according to the correlation of the propagation channel in the transmission antenna, the state of the propagation path, and the like. You can choose. As a result, a situation in which the error rate of the received signal increases can be avoided, and the transmission capacity can be increased. Note that acquisition of channel response information may be performed by receiving a radio signal, or other methods may be used.
- the selection control unit based on the acquired channel response information, correlates between channel responses formed by the transmission antennas. And a selection index value representing the above-described transmission index, and a combination of the transmission antennas is selected based on the selection index value.
- any one of the plurality of transmission antennas is selected based on the selection index value representing the correlation between the propagation path responses, the error rate of the received signal is increased due to the high correlation of the propagation channel in the transmission antenna. Can be avoided, and the transmission capacity can be increased.
- the radio transmitter according to the present invention further includes a known signal output unit that outputs a known signal, and all the transmission antennas transmit the known signal to a communication partner,
- the acquisition unit acquires propagation path response information from the communication partner based on the known signal! It is characterized by doing.
- the known signal output unit outputs the known signal at the start of communication, and all the transmission antennas communicate the known signal at the start of communication. It is characterized by sending to the other party!
- the known signal output unit outputs the known signal at a constant period, and all the transmitting antennas perform the known signal at a constant period. It is characterized by sending a signal to a communication partner!
- the acquisition unit acquires the propagation path response information or error frequency information of a signal transmitted from the communication partner
- the known signal output unit determines the output timing of the known signal based on the acquired propagation path response information or error frequency information, and all the transmission antennas have the output timing of the known signal.
- the known signal is transmitted together.
- the output timing of the known signal is determined based on the propagation path response information or the error frequency information, and the known signal is transmitted in accordance with the output timing of all the transmitting antenna power known signals.
- the transmission antenna can be changed only when there is a high possibility that the error rate can be reduced by changing the combination of transmission antennas to be selected.
- efficient communication can be realized.
- the selection control unit performs propagation using the propagation path response as an element based on the acquired propagation path response information.
- a channel response vector generator for generating a path response vector for each transmission antenna, a selection index value calculation unit for calculating the selection index value from each channel response vector, and the selection index values are compared.
- a comparison unit that generates specific information that identifies a combination of transmission antennas, and a transmission antenna selection unit that selects only the combination of transmission antennas based on the identification information. It is characterized by providing.
- the selection index value is calculated from the channel response vector having the channel response as an element, it is possible to determine the combination of transmission antennas to be selected by a simple method. Further, since the selection index values are compared with each other and the combination of the transmission antennas having the lowest selection index value is selected, the error rate can be reduced.
- the selection index value calculating unit is The propagation path response vector generated based on the propagation path response formed by the transmitting antenna and the receiving antenna of the communication partner, and the other V or the other transmitting antenna and the receiving antenna of the communication partner.
- the selection index is obtained by multiplying the vector obtained by conjugate transposition of the channel response vector generated based on the channel response formed and dividing the multiplied value by the absolute value of each channel response vector. It is characterized by calculating the value.
- the selection index value calculation unit is any one A propagation path response vector generated based on a propagation path response formed by one of the transmission antennas and the receiving antenna of the communication partner, and V, a difference between the other transmitting antenna and the communication partner. Multiplying the channel response vector generated based on the channel response formed by the receiving antenna with the conjugate transposed vector, and the multiplied value is multiplied by each channel. The operation of dividing by the absolute value of the response vector is performed for all combinations of the transmission antennas, and the operation values corresponding to the combinations of transmit antennas that can be selected are extracted and added from the obtained operation values. The selection index value is calculated.
- the selection control unit compares the selection index value with a predetermined threshold value and selects the transmission according to the comparison result. It is characterized by determining the number of antennas.
- the selection index value is compared with a predetermined threshold value, and the number of transmission antennas to be selected is determined according to the comparison result.
- the selection index value is larger than the threshold value, By reducing the number of transmission antennas to be selected, the error rate can be reduced.
- the selection index value is smaller than the threshold value, the transmission capacity can be increased by increasing the number of transmission antennas to be selected.
- the selection control unit based on the acquired channel response information, correlates between channel responses formed by the transmission antennas.
- a selection index value representing a signal-to-noise ratio of each transmission antenna is calculated for each subcarrier, and a combination of the transmission antennas is selected for each subcarrier based on the selection index value.
- the transmission antenna of each of the transmission antennas As described above, based on the selection index value representing the correlation between the transmission antennas or the selection index value representing the signal-to-noise ratio (SNR, SINR) of each transmission antenna, the transmission antenna of each of the transmission antennas. Since the combination is selected, the optimal transmission antenna combination can be selected for each subcarrier, and the error rate on the receiving side can be improved.
- SNR signal-to-noise ratio
- the selection control unit is configured by combining a plurality of subcarriers into one based on a selection index value calculated for each of the subcarriers.
- the combination of the transmission antennas is selected for each block.
- the selection control unit may combine the transmission antennas for each block according to a calculation result using a selection index value calculated for each subcarrier. It is characterized by selecting.
- the combination of transmission antennas for each block is selected according to the calculation result using the selection index value calculated for each subcarrier, the selection index value calculated for each subcarrier is reflected.
- a combination of transmit antennas for each block can be selected.
- an optimal combination of transmission antennas can be selected for each block, and the error rate on the receiving side can be improved.
- the selection control unit may determine whether the selection index value calculated for each subcarrier is the lowest for each block according to the total number of subcarriers selected. The combination of the transmission antennas is selected.
- the combination of transmission antennas for each block is selected according to the total number of subcarriers selected when the selection index value calculated for each subcarrier is the lowest, the selection index calculated for each subcarrier is selected.
- the optimal combination of transmit antennas can be selected for each block according to the value, and the error rate on the receiving side can be improved.
- the selection control unit sets a point in the ranking ranked according to the selection index value calculated for each subcarrier, and The combination of the transmitting antennas for each block is selected according to the total points obtained by adding the points.
- the selection control unit uses a selection index value calculated for each subcarrier to select a selection index in a block for each combination of the transmission antennas. A value obtained by averaging values is obtained, and a combination of the transmission antennas for each block is selected according to the averaged value.
- the selection control unit uses a selection index value calculated for each subcarrier to select a selection index in a block for each combination of the transmission antennas.
- a value obtained by weighted averaging of values is obtained, and the combination of the transmission antennas for each block is selected according to the weighted average value.
- the selection control unit weights a value obtained by averaging selection index values in the block or a selection index value in the block. It is characterized by changing the number of subcarriers composing one block according to the average value.
- the selection control unit weights a value obtained by averaging selection index values in the block, or a selection index value in the block. Averaged value power If the value is lower than a predetermined threshold, the number of subcarriers constituting one block is increased.
- the selection control unit weights a value obtained by averaging the selection index values in the block or the selection index value in the block. Averaged value power If the value is higher than a predetermined threshold, the number of subcarriers constituting one block is reduced.
- the selection control unit sets an upper limit value or a lower limit value of the number of subcarriers constituting one block. It is.
- the selection control unit determines the number of subcarriers constituting one block according to the selection index value calculated for each subcarrier. It is characterized by changing.
- the number of subcarriers constituting one block is changed according to the selection index value calculated for each subcarrier, so that the processing quality is suppressed while maintaining the reception quality. can do.
- the selection control unit includes the subcarrier.
- the selection index value calculated for each rear is compared with a predetermined threshold value.
- the number of subcarriers constituting one block is changed according to the comparison result between the selection index value calculated for each subcarrier and a predetermined threshold value, and therefore, according to the predetermined threshold value.
- the predetermined threshold value it is possible to suppress the processing from becoming complicated while maintaining the reception quality.
- the selection control unit includes subcarriers constituting one block according to the error frequency information of the signal transmitted by the communication partner destination. It is characterized by changing the number of
- the number of subcarriers constituting one block is changed according to the error frequency information of the signal transmitted from the communication partner, so that the reception quality is maintained while reflecting the error frequency, It is possible to suppress the processing from becoming complicated.
- the wireless receiver includes a plurality of receiving antennas that receive a radio signal, and each of the receiving antennas based on a known signal that the plurality of receiving antennas have received by a communication partner. And a channel response information generating unit that generates channel response information indicating a channel response formed by the transmission antenna of the communication partner, and the communication partner transmits the transmission from the generated channel response information.
- a selection index value serving as a reference for selecting a combination of antennas is calculated, and a selection information generation unit that generates selection information based on the selection index value, and the generated selection information to the communication partner And a notification section for notification.
- a selection index value serving as a reference when the communication partner selects the combination of transmission antennas is calculated, and a combination of transmission antennas at the communication partner is calculated from the selection index value. Since the selection information for selecting is generated and this selection information is notified to the communication partner, the amount of information notified from the wireless receiver to the communication partner should be reduced compared to the case of notifying the transmission path response information. Can do. As a result, the overhead can be reduced.
- the selection information generation unit is configured to transmit a propagation path formed by each transmission antenna of the communication partner from the generated propagation path response information. Calculate a selection index value that represents the correlation between responses, and based on this selection index value, The communication partner generates selection information for selecting a combination of the transmission antennas.
- a selection index value representing a correlation between channel responses formed by each transmission antenna of the communication partner is calculated from the channel response information, and the selection index value is calculated from this selection index value. Since the selection information for selecting any of the plurality of transmission antennas at the communication partner is generated and this selection information is notified to the communication partner, the amount of information notified from the wireless receiver to the communication partner is determined by the channel response information. It can be reduced compared with the notification. As a result, overhead can be reduced.
- the selection information generation unit is configured to determine the propagation path response as an element based on the generated propagation path response information.
- a channel response vector generating unit that generates a channel response vector for each transmission antenna of the communication partner, a selection index value calculating unit that calculates the selection index value from each channel response vector, and
- a comparison unit that compares the selection index values and generates selection information for the transmission destination to select a combination of transmission antennas having the lowest selection index value.
- the selection index value is calculated from the channel response vector having the channel response as an element, it is possible to determine the combination of transmission antennas to be selected at the communication partner by a simple method. Can do.
- the selection index values are compared with each other, and the combination of transmission antennas having the lowest selection index value is selected, so that the error rate can be reduced.
- the propagation path response information generation unit generates a known signal received by the plurality of receiving antennas from the communication partner at a constant cycle. Based on this, the comparison unit generates the channel response information only when the selection index value is calculated by the selection index value calculation unit, which is lower than the immediately preceding selection index value. It is characterized by generating selection information for selecting a combination of transmitting antennas corresponding to the index value.
- the radio receiver according to the present invention further includes a detection unit that detects an error frequency of a signal received from the communication partner, and the notification unit is configured to respond to the detected error frequency. And making a transmission request for a known signal to the communication partner.
- the selection index value calculation unit includes: , A channel response vector generated based on a channel response formed by one of the receiving antennas and the transmitting antenna of the communication partner, V, and a communication with the other one of the receiving antennas. Multiplying the vector obtained by conjugate transposition of the channel response vector generated based on the channel response formed with the transmission antenna of the other party, and dividing this multiplied value by the absolute value of each channel response vector. In this way, the selection index value is calculated.
- the radio receiver calculates the selection index value when selecting! /, Or more than three transmission antennas, from a plurality of transmission antennas at the communication partner. Is based on a propagation path response formed by any one of the receiving antennas and the transmission antenna of the communication partner, and V, a deviation, or another one Based on the propagation path response formed by the receiving antenna and the transmission antenna of the communication partner, a vector obtained by conjugate transposing the propagation path response vector generated based on V is multiplied, and the multiplied value is multiplied by each propagation path. The division by the absolute value of the path response vector is performed for all combinations of transmission antennas at the communication partner, and each of the combinations of transmission antennas that can be selected from the respective calculated values is supported. The selection index value is calculated by extracting and adding operation values to be calculated.
- a selection index value for determining a combination of transmission antennas to be selected can be calculated. Therefore, the amount of calculation is reduced, and a high-speed process for selecting a transmission antenna is achieved. Is possible.
- the selection information generation unit compares the selection index value with a predetermined threshold value, and according to the comparison result. The number of transmitting antennas to be selected is determined.
- the selection index value is compared with a predetermined threshold value, and the number of transmission antennas to be selected is determined according to the comparison result.
- the selection index value is larger than the threshold value, By reducing the number of transmission antennas to be selected, the error rate can be reduced.
- the selection index value is smaller than the threshold value, the transmission capacity can be increased by increasing the number of transmission antennas to be selected.
- the radio transmitter according to the present invention is notified from a plurality of transmission antennas capable of transmitting radio signals and the radio receiver according to any one of claims 26 to 32.
- a selection control unit that selects a combination of the transmission antennas based on the selection information, and transmitting a radio signal by the selected combination of transmission antennas.
- the selection index value is calculated in the radio receiver of the communication partner, and selection information for selecting a combination of transmission antennas in the wireless transmitter is generated from the selection index value. Since this selection information is notified to this wireless transmitter, the amount of information that is also notified to the wireless transmitter of the wireless receiver power of the communication partner is more than that when notifying the channel response information. Can be reduced. As a result, overhead can be reduced. [0078] (34) In the radio receiver according to the present invention, the selection information generation unit is formed from each of the transmission antennas of the communication counterpart from the generated propagation path response information.
- a selection index value representing a correlation between transmission path responses or a signal-to-noise ratio of each transmission antenna is calculated for each subcarrier, and based on this selection index value, the communication partner transmits the transmission for each subcarrier. It is characterized by generating selection information for selecting a combination of antennas.
- a selection index that represents the correlation between channel responses formed by each transmitting antenna of the communication partner or the signal-to-noise ratio of each transmitting antenna.
- a value is calculated for each subcarrier, selection information for selecting a combination of transmission antennas for each subcarrier in the communication partner is generated from this selection index value, and this selection information is notified to the communication partner.
- the amount of information notified from the wireless receiver to the communication partner can be reduced as compared with the case of notifying the channel response information. As a result, overhead can be reduced.
- the radio transmitter according to the present invention is based on a plurality of transmission antennas capable of transmitting radio signals and the selection information notified from the radio receiver according to claim 34.
- a selection control unit that selects a combination of the transmission antennas for each carrier, and transmits a radio signal by the combination of the transmission antennas selected above.
- the selection index value is calculated for each subcarrier, and the selection index value is generated. Selection information for selecting the combination of transmission antennas in this radio transmitter is generated. Since this selection information is notified to the wireless transmitter, the amount of information notified to the wireless transmitter from the wireless receiver of the communication partner is reduced compared to the case of notifying the channel response information. Can be made. As a result, overhead can be reduced.
- a base station apparatus includes the radio transmitter according to any one of claims 1 to 24, 33, or 35! /
- the combination of transmission antennas is selected based on the selection index value, so that the correlation of the propagation channel in the transmission antenna and the state of the propagation path are selected.
- a combination of transmission antennas can be selected according to the situation. As a result, it is possible to avoid an increase in the error rate of the received signal and to increase the transmission capacity.
- acquisition of propagation path response information may be performed by receiving a radio signal, or other methods may be used.
- the mobile station apparatus is characterized by including the radio receiver according to any one of claims 25 to 32 or claim 34.
- the mobile station apparatus calculates a selection index value that serves as a reference when a communication partner such as a base station apparatus selects the combination of transmission antennas. Index value power Selection information for selecting the combination of transmission antennas at the communication partner is generated and this selection information is notified to the communication partner. The amount of information to be notified from the wireless receiver to the communication partner This can be reduced compared to when information is notified. As a result, overhead can be reduced.
- the transmission antenna is selected according to the correlation of the propagation channel in the transmission antenna, the state of the propagation path, and the like. A combination can be selected. As a result, an increase in the error rate of the received signal can be avoided and the transmission capacity can be increased.
- the wireless transmitter includes a plurality of transmission antennas, and calculates a selection index related to spatial correlation based on propagation path response information notified from a receiving-side wireless communication device that is a communication partner. Then, the combination of the transmission antennas with the lowest selection index is selected, and information is spatially multiplexed using the selected transmission antennas for radio transmission. As a result, it is possible to reduce the deterioration of the error rate in the receiving-side radio communication device that is the communication partner.
- FIG. 1 is a block diagram showing a schematic configuration of a wireless communication device to which the wireless transmitter according to the first embodiment is applied.
- This wireless communication device can be applied to, for example, a base station device in a cellular system.
- the wireless communication device 1 is a wireless transmitter. All transmitters 2, receivers 3 as wireless receivers, transmission / reception controller 4 for controlling each unit, duplexer 5, multiple antennas 6-l to 6-n, and communication with other communication devices by wire Consists of interface 7!
- FIG. 2 is a block diagram illustrating a schematic configuration of the transmission unit 2 of the wireless communication device 1.
- the transmission unit 2 has a function of performing space division multiplexing transmission using a plurality of transmission antennas Txl to TxN, and performs space division multiplexing transmission according to a plurality of space division multiplexing numbers.
- the transmission control unit 21 transfers the information data transferred from the upper layer to the lower layer while performing overall control related to the transmission of the transmission unit 2 as a radio transmitter.
- the channel response information formed by each transmitting antenna notified from the communication partner of the wireless communication device 1 is output to the channel response vector generation unit 22.
- the modulation unit 23 modulates the information data input from the transmission control unit 21 based on the modulation scheme, coding rate, and the like notified from the transmission control unit 21 to generate modulation data.
- the space division multiplexing unit 24 performs space division multiplexing processing on the modulation data input from the modulation unit 23 based on the number of space division multiplexing notified from the transmission control unit 21 to generate transmission data. Generate.
- the pilot signal generation unit 25 generates a known signal for synchronization and propagation path response estimation based on the number of spatial division multiplexing notified from the transmission control unit 21.
- the propagation path response vector generation unit 22 generates a propagation path response vector based on the propagation path response information input from the transmission control unit 21.
- Figure 3 (a) shows a schematic diagram of the propagation path response formed by a wireless transmitter that transmits using three transmitting antennas and a wireless receiver that receives signals using three receiving antennas.
- Txl, ⁇ 2, and ⁇ 3 indicate transmitting antennas
- Rxl, Rx2, and Rx3 indicate receiving antennas, respectively.
- H is the propagation path formed between the transmitting antenna and the receiving antenna
- the propagation path response information also has the information power of these propagation path responses.
- Fig. 3 (a) nine channel responses are formed.
- the propagation path response formed by Txl is the receiving antenna Rxl, Rx 2 and Rx3 are h 1, h 2, and h 2, respectively.
- a vector having these propagation path responses as elements is defined as a propagation path response of each transmitting antenna: vector.
- the propagation path response vector of each transmission antenna is expressed by Equation (1).
- a selection index calculation unit 26 calculates a correlation between two transmission antennas based on the channel response vector input from the channel response vector generation unit 22.
- Vector multiplication of the channel response vector formed by one transmitting antenna and the channel response vector formed by the other transmitting antenna is performed by conjugate transposition, and each channel response vector is calculated from the multiplied value.
- the wireless transmitter selects two transmitting antennas from a plurality of transmitting antennas, this value is used as a selection index (hereinafter, the selection index value is simply referred to as “selection index”).
- Equation (2) The correlation value p between the antennas is expressed by Equation (2). Where A and B are
- p indicates the correlation between the propagation path response vector formed by the transmission antenna Txl and the propagation path response vector formed by the transmission antenna Tx2.
- the selection index comparison unit 27 compares the selection indexes based on the selection index input from the selection index calculation unit 26, selects the transmission antenna combination with the lowest selection index, and generates transmission antenna selection information. To do.
- transmission antenna selection processing when three or more transmission antennas are selected from among a plurality of transmission antennas will be described.
- the processing of the selection index calculation unit 26 is significantly different from the case where two transmission antennas are selected from the plurality of transmission antennas described above.
- the propagation path response vector generation unit 22 generates a propagation path response vector based on the propagation path response information input from the transmission control unit 21.
- Figure 3 (b) shows a schematic diagram of the propagation path response formed by a wireless transmitter that transmits using four transmitting antennas and a wireless receiver that receives signals using three receiving antennas. In the case of Fig. 3 (b), 12 propagation path responses are formed.
- the propagation path response vector of each transmission antenna is expressed by Equation (3).
- the selection index calculation unit 26 first calculates the correlation value between the two transmission antennas based on the channel response vector input from the channel response vector generation unit 22.
- Vector multiplication of the conjugate response of the channel response vector formed by one transmitting antenna and the channel response vector formed by the other transmitting antenna is performed, and the absolute value of each channel response vector is calculated from the multiplied value.
- TxATxB is a formula (
- a selection index is defined based on the correlation value between the two transmit antennas derived as described above.
- the wireless transmitter selects three or more transmit antennas from multiple transmit antennas, the sum total of all possible correlation values between the two transmit antennas is used as the selection index according to the number of transmit antennas used. .
- the correlation value for each combination of transmission antennas when the wireless transmitter selects three transmission antennas from four transmission antennas is expressed by Equation (5). For example, p
- TxATxBTxC Tx is the channel response vector formed by the transmit antenna Txl and the transmit antenna ⁇
- the correlation between the channel response vector formed by x2 and the channel response vector formed by transmit antenna Tx3 is shown.
- the selection index comparison unit 27 compares the selection indexes based on the selection index input from the selection index calculation unit 26, selects the transmission antenna combination with the lowest selection index, and generates transmission antenna selection information. To do.
- the transmitting antennas Txl to T ⁇ transmit up-converted transmission signals.
- FIG. 4 is a block diagram showing a schematic configuration of a wireless communication device to which the wireless receiver according to the first embodiment is applied.
- This wireless communication device can be applied to, for example, a mobile station device such as an automobile phone or a cellular phone in a cellular system.
- the wireless communication device 11 includes a transmission unit 12 as a wireless transmitter, a reception unit 13 as a wireless receiver, a transmission / reception control unit 14 for controlling each unit, a duplexer 15, and a plurality of antennas 16-1.
- FIG. 5 is a block diagram showing a schematic configuration of the receiving unit 13 of the wireless communication device 11.
- the receiving unit 13 as a wireless receiver has a plurality of transmitting antennas in the wireless communication device of the communication partner. It has a function of receiving a transmission signal transmitted using space division multiplexing and performing signal separation and detection.
- Reception antennas Rxl to RxM receive transmission signals that have undergone propagation path fluctuations.
- the reception RF units 40-1 to 40-M down-convert the reception signals input from the reception antennas Rxl to RxM and output them.
- the propagation path response estimation unit 41 estimates the propagation path response formed by each transmission antenna shown in FIG. 3 based on the known signal section of the reception signal input from the reception RF units 40-1 to 40-M. . Then, the estimated propagation path response is output to the signal separation detection unit 42, and information related to the propagation path response is notified from the transmission unit 12 of the wireless communication device 11 to the wireless communication device that is the communication partner.
- the signal separation detection unit 42 Based on the channel response input from the channel response estimation unit 41, the signal separation detection unit 42 performs the following operation on the data section of the received signal input from the reception RF units 40-1 to 40-M. Spatial division multiplexed signals are separated and detected, and received signals corresponding to the signals transmitted by each transmitting antenna are detected.
- the demodulator 43 demodulates the received signal input from the signal separation detector 42 based on the modulation scheme, coding rate, etc. notified from the reception controller 44 to generate demodulated data.
- Reception control unit 44 performs overall control related to reception by reception unit 13, and transfers the demodulated data from demodulation unit 43 transferred from the lower layer to the upper layer as information data.
- the communication with the transmission control unit of the transmitter 12 in the radio communication device 11 is performed to notify the channel response information. Control.
- FIG. 6 is an explanatory diagram of a process related to selection of a transmission antenna in a communication system including the wireless transmitter and the wireless receiver according to the first embodiment.
- the wireless communication apparatus having the wireless transmitter according to the first embodiment is a base station
- the wireless communication apparatus having the wireless receiver according to the first embodiment is a mobile station. The selection of the transmission antenna of the base station in the downlink will be described.
- step A1 when the base station transmits a known signal (step A1), for example, The station estimates the channel response between each transmitting and receiving antenna based on the signal received by the base station (step A2). Next, the mobile station transmits information on the estimated channel response to the base station (step A3). Next, the base station receives the channel response information transmitted from the mobile station (step A4). Then, the base station searches for a combination of transmission antennas having the lowest selection index based on the received channel response information (step A5). Here, the method described above is used as a method of searching for a combination of transmitting antennas having the lowest selection index. Next, the base station selects a transmission antenna based on the searched combination of transmission antennas (step A6). Thereafter, until the transmission antenna is changed, the base station performs radio transmission using the selected transmission antenna.
- FIG. 7 is an explanatory diagram showing an example of a transmission frame transmitted from each transmission antenna of the radio transmitter of the base station according to the first embodiment.
- Fig. 7 shows the case where the number of transmission antennas used is reduced by one and communication is performed using two transmission antennas during communication using three transmission antennas.
- P is a known signal for synchronization and propagation path estimation
- D is a transmission data signal.
- DL indicates the downlink from the base station to the mobile station
- UL indicates the uplink to the mobile station power base station.
- the radio having the radio transmitter according to the first embodiment is used. The selection of the transmission antenna of the base station in the downlink will be described using the communication device as a base station and the wireless communication device having the wireless receiver according to the first embodiment as a mobile station.
- FIG. 8 shows an example of a known signal that can estimate the propagation path response of each transmission antenna.
- Fig. 8 (a) shows an orthogonal pilot signal in which the sequence for each transmitting antenna is orthogonal
- Fig. 8 (b) shows a known signal using the principle of space-time coding
- Fig. 8 (c) Shows a configuration in which a known signal is transmitted from only one transmission antenna at the same time.
- “arrow t” indicates the passage of time.
- the mobile station estimates the channel response of each transmit antenna from the known signals transmitted from each of the three transmit antennas of the base station, and notifies the base station of the channel response information via the uplink.
- the base station selects the combination of transmission antennas with the lowest selection index based on the propagation path response information notified from the mobile station.
- Fig. 7 shows the case where the combination power selection index of the transmission antennas of Txl and Tx2 is the lowest, and Txl and ⁇ ⁇ ⁇ ⁇ ⁇ 2 in the downlink after the exchange of information regarding the change of the transmission antenna is completed between the base station and the mobile station Use to communicate.
- the radio transmitter of the base station according to the first embodiment communicates with a plurality of transmission antennas V and reduces the number of transmission antennas to be used during the communication. Power described for selection
- the present invention is not limited to this. Also, here, a description has been given using a transmission frame in which a known signal is placed in the front part and subsequently a transmission data signal, but in a transmission frame in which a known signal is placed in the rear part of the transmission frame or in the center of the transmission frame. Even transmission frames with known signals.
- Step Pl the propagation path response between the transmit antenna of the radio transmitter of the base station and the receive antenna of the radio receiver of the mobile station is estimated.
- Step Pl it is determined whether or not the propagation path response has been estimated for all the transmission antennas with one receiving antenna (step ⁇ 2), and the propagation path responses have not been estimated for all the transmission antennas. If so, go to Step P1.
- the propagation path responses have been estimated for all the transmitting antennas, it is determined whether or not the propagation response has been estimated by all the receiving antennas (step ⁇ 3). If the antenna estimation is complete, go to step P1.
- the radio receiver of the mobile station notifies the radio channel response information to the radio transmitter of the base station that is the communication partner, and The transmitter generates a channel response vector for each transmission antenna based on the notified channel response information (step P4).
- step P6 correlation values between the transmission antennas are calculated.
- the correlation value between the transmitting antennas is defined as a selection index.
- it is determined whether the force has been calculated for all two combinations of transmit antennas step P7, and if the correlation value has not been calculated for all two combinations, Move on to step P6.
- the selection index that is the correlation value is compared, and the combination of transmitting antennas with the lowest selection index is selected.
- FIG. 10 shows the flowchart for selecting three or more transmit antennas from multiple transmit antennas.
- step Rl the propagation path response between the transmit antenna of the base station radio transmitter and the receive antenna of the mobile station radio receiver is estimated.
- step R2 it is determined whether or not the power of one transmission antenna has been estimated for all transmission antennas, and the propagation path response has not been estimated for all transmission antennas. If so, go to Step R1.
- step R3 it is determined whether the estimation of the propagation path response has been completed for all the receiving antennas. If estimation has not been completed with the receiving antenna, proceed to Step R1.
- the radio receiver of the mobile station notifies the radio transmission response information to the radio transmitter of the base station that is the communication partner, and The transmitter generates a propagation path response vector for each transmission antenna based on the notified propagation path response information (step R4).
- it is determined whether or not the force has been generated for all the transmission antennas step R5. If the propagation path response vector has been generated, the process proceeds to step R4.
- the correlation value between the transmission antennas is calculated (step R6).
- step R7 it is determined whether or not the force has been calculated for all two combinations of transmitting antennas (step R7), and the correlation values have not been calculated for all two combinations. Moves on to step R6.
- step R8 The total sum of the correlation values between the two transmit antennas that can be taken according to the number of transmit antennas used is calculated (step R8).
- step R9 it is determined whether or not the sum of correlation values has been calculated for all combinations of transmit antennas (step R9), and if the sum of correlation values has not been calculated for all combinations, proceed to step R8. To do.
- the selection indices are compared, and the combination with the lowest selection index is selected.
- the present invention is not limited to this case.
- the power of multiple transmitting antennas is less than that, and it can be easily applied even when multiple transmitting antennas are selected.
- the present invention is applied when a wireless transmitter has five transmission antennas, four transmission antennas are narrowed down in advance, and three transmission antennas are selected from the narrowed four transmission antennas. it can.
- the present invention is not limited to a maximum ratio combining transmission diversity, such as a space-time code transmission diversity.
- the present invention can be applied to a configuration in which transmission is performed using a transmission antenna. That is, instead of the space division multiplexing unit 24 shown in FIG. 2, a transmission weighting synthesis unit for performing transmission weighting or a space-time code unit for performing space-time code transmission is provided. With such a configuration, the transmission antenna selection processing of the present invention can be performed. Further, instead of the signal separation detection unit 42 shown in FIG. 5, a radio receiver provided with a reception synthesis unit is configured. It can also be made.
- the transmission antenna selection process of the present invention can be applied.
- This reception combining unit performs maximum ratio combining and space-time code decoding processing according to the transmission method on the transmitting side.
- the transmission antenna selection processing of the present invention can be applied to a configuration using both space division multiplexing and transmission diversity.
- the combination of transmission antennas that can be used when communication is performed using a plurality of transmission antennas is selected. Therefore, a combination of transmission antennas with low correlation can be selected, and the error rate on the receiving side can be reduced.
- FIG. 11 is a block diagram illustrating a schematic configuration of a wireless transmitter according to the second embodiment.
- This wireless transmitter corresponds to the transmitter 2 of the wireless communication device 1 according to the first embodiment shown in FIG.
- FIG. 12 is a block diagram showing a schematic configuration of the radio receiver according to the second embodiment.
- This wireless receiver corresponds to the receiving unit 13 of the wireless communication device 11 according to the first embodiment shown in FIG.
- the difference from the first embodiment is that the receiving unit 13 of the radio communication device 11 as the mobile station performs the selection process of the transmission antenna, and the transmission antenna 2 transmits the selection information of the transmission antenna as the base station.
- the transmission unit 2 of the wireless communication device 1 serving as a base station performs transmission antenna selection based on the notified transmission antenna selection information.
- the radio transmitter in the base station according to the second embodiment shown in FIG. 11 will be described with respect to the differences from the radio transmitter according to the first embodiment.
- the channel response vector generation unit 22, the selection index calculation unit 26, and the selection index comparison unit 27 in FIG. 2 are configured in the reception unit 13 of the wireless communication device 11 as a mobile station that is a communication partner. Transmission antenna selection information is notified from the reception unit 13 of the wireless communication device 11.
- the transmission control unit 50 controls the processing of the transmission antenna selection unit 51 based on the notified transmission antenna selection information.
- the transmission antenna selection unit 51 transmits a known signal input from the pilot signal generation unit 52 and a transmission input from the space division multiplexing unit 53 based on the control signal related to selection of the transmission antenna input from the transmission control unit 50. Data signals are output to each antenna system.
- the reception unit 13 in the mobile station according to the second embodiment is configured with a propagation path response beta generation unit 60, a selection index calculation unit 61, and a selection index comparison unit 62. .
- the processing of each unit is the same as that configured in the transmission unit 2 of the wireless communication device 1 in the base station according to the first embodiment.
- the reception control unit 44 uses the transmission unit selection information of the transmission antenna output from the selection index comparison unit 62 to the radio transmitter 1 of the base station that is the communication partner, using the transmission unit 12 of the mobile station radio communication device 11. Then, information on transmission antenna selection is notified.
- FIG. 13 is an explanatory diagram of a process related to selection of a transmission antenna of a communication system including a radio transmitter in a base station and a radio receiver in a mobile station according to the second embodiment.
- the wireless communication apparatus having the wireless transmitter according to the first embodiment is used as a base station, and the wireless communication apparatus having the wireless receiver according to the first embodiment is moved. As a station, the selection of the transmission antenna of the base station in the downlink will be described.
- the mobile station when the base station transmits a known signal to the mobile station (step B1), the mobile station estimates the channel response between the transmitting and receiving antennas based on the signal received from the base station (step B1). B2). Next, the mobile station searches for a combination of transmission antennas having the lowest selection index based on the estimated channel response (step B3).
- the method described above is used as a method of searching for a combination of transmission antennas having the lowest selection index.
- the mobile station transmits transmission antenna selection information indicating the combination of transmission antennas having the lowest selected selection index to the base station (step B4).
- the base station receives transmission antenna selection information (step B5). Next, the base station selects a transmission antenna based on the received transmission antenna selection information (step B6). Thereafter, radio transmission is performed using the selected transmission antenna.
- a flowchart showing the operations of the radio transmitter in the base station and the radio receiver in the mobile station according to the second embodiment is a flowchart showing the operations of the radio transmitter and the radio receiver according to the first embodiment. Is almost the same.
- steps P4 to P8 are performed by the radio transmitter of the base station, but in the second embodiment, steps P4 to P8 are performed by the radio receiver of the mobile station.
- steps R4 to R10 are performed by the radio transmitter of the base station in the first embodiment, but steps R4 to R10 are performed by the radio receiver of the mobile station in the second embodiment.
- the information notified from the mobile station radio receiver to the base station radio transmitter is not the channel response information but the transmission antenna selection information.
- the amount of information to be notified can be reduced, and overhead can be reduced.
- the radio transmitter in the base station and the radio receiver in the mobile station according to the third embodiment select several transmission antennas from a plurality of transmission antennas at the start of communication.
- the radio transmitter in the base station according to the third embodiment can adopt the same configuration as the radio transmitter according to the first or second embodiment, but the operations of the pilot signal generation unit and the transmission antenna selection unit Is different.
- the pilot signal generation unit generates a known signal corresponding to every transmission antenna at the start of communication.
- the transmission antenna selection unit outputs the known signal output from the pilot signal generation unit to all antenna systems at the start of communication.
- the radio receiver in the mobile station receives a known signal transmitted from the radio transmitter in the base station at the start of communication, and estimates the channel response formed by each transmission antenna. To do. Thereafter, the transmission antenna is selected by the same processing as in the first or second embodiment, and the radio transmitter in the base station transmits the known signal and the transmission data signal using the selected transmission antenna.
- FIG. 14 is a schematic explanatory diagram of a process related to selection of a transmission antenna of a communication system including a radio transmitter in a base station and a radio receiver in a mobile station according to the third embodiment.
- the wireless communication apparatus having the wireless transmitter according to the third embodiment is a base station
- the wireless communication apparatus having the wireless receiver according to the third embodiment is a mobile station.
- the downlink Selection of the transmission antenna of the base station will be described.
- the description will be based on the radio transmitter and the radio receiver according to the first embodiment, the third embodiment can be applied based on the second embodiment.
- the base station in which the information data is generated notifies the mobile station that communication is started (step Cl).
- communication parameters, transmission method, number of transmission antennas, and known signal information are notified.
- the mobile station that has received the communication start notification notifies the base station of a response to the communication start notification (step C2).
- the base station to which the response is notified from the mobile station transmits known signals from all the transmitting antennas (step C3).
- the mobile station receives a known signal (step C4) and estimates the channel response formed by each transmitting antenna (step C5).
- the mobile station transmits information on the estimated channel response to the base station (step C6).
- the base station that has received the propagation path response information searches for a combination of transmission antennas having the lowest selection index based on the propagation path response information (step C8).
- the base station selects a transmission antenna based on the searched combination of transmission antennas (step C9). Thereafter, the base station performs radio transmission using the selected transmission antenna.
- FIG. 15 is an explanatory diagram showing an example of a transmission frame transmitted from each transmission antenna of the wireless transmitter according to the third embodiment.
- FIG. 15 shows a case where a wireless transmitter having three transmitting antennas starts data communication using two transmitting antennas.
- the base station transmits a known signal on the downlink from all the antennas Txl, ⁇ 2, and ⁇ 3.
- Txl transmits a transmission data signal composed of, for example, a communication parameter, a transmission method, the number of transmission antennas, and known signal information following the known signal.
- the mobile station estimates the propagation path response of each transmission antenna with the known signal power with which each of the three transmission antenna powers of the base station is transmitted, and notifies the base station of the propagation path response information through the uplink.
- the base station selects a combination of transmission antennas having the lowest selection index based on the channel response information notified from the mobile station.
- Figure 15 shows the case where the combination of Txl and Tx2 transmit antennas has the lowest selection index.
- the present invention is not limited to this case. .
- the present invention can be easily applied to a case where a plurality of transmission antennas are selected with a smaller number of transmission antennas in order to reduce processing.
- the present invention is applied when a wireless transmitter has five transmission antennas, four transmission antennas are narrowed down in advance, and three transmission antennas are selected from the narrowed four transmission antennas. it can.
- the wireless transmitter transmits known signals from the four transmitting antennas at the start of communication.
- the radio transmitter according to the fourth embodiment periodically transmits all signals with known transmit antenna power.
- FIG. 16 is an explanatory diagram showing an example of a transmission frame transmitted from each transmission antenna of the wireless transmitter according to the fourth embodiment.
- FIG. 16 shows a case where a radio transmitter having three transmitting antennas periodically transmits a known signal from all transmitting antennas while communicating using two transmitting antennas.
- the base station communicates information data using Txl and Tx2, and periodically transmits known signals using ⁇ 3.
- the base station shows a case where all signals with known transmit antenna power are transmitted every three transmission frames.
- the timing for periodically transmitting a known signal is not limited to fixed every three transmission frames, and the timing is controlled according to the error frequency on the receiving side and the radio propagation environment.
- the radio receiver of the mobile station transmits the channel response information to the radio transmitter of the base station that is the communication partner.
- the propagation path response is estimated from known signals periodically transmitted, the estimated propagation path response information is transmitted to the base station radio transmitter, and the base station radio transmitter receives the received signal. Deed
- the transmission antenna is selected based on the carrying path response information.
- the transmission antenna selection information when configuring the fourth embodiment, that is, for the radio receiver of the base station with which the radio receiver of the mobile station is the communication partner, the transmission antenna selection information .
- the propagation path response is estimated from the known signals transmitted periodically, the combination of transmission antennas with the lowest selection index is searched, and the transmission antenna selection information is periodically transmitted to the base station via radio transmission.
- the base station radio transmitter selects the transmission antenna based on the received transmission antenna selection information.
- the overhead due to the notification of the transmission antenna selection information can be reduced by not transmitting the transmission antenna selection information to the base station radio transmitter.
- FIG. 17 is a diagram illustrating a transmission antenna of a communication system including a base station radio transmitter and a mobile station radio receiver when the fourth embodiment is configured based on the second embodiment. It is a schematic explanatory drawing about the process regarding selection.
- the base station periodically transmits a known signal for all transmitting antenna forces (transmits at a constant cycle) (step D1).
- the mobile station receives a known signal (step D2), and estimates the propagation path response formed by each transmission antenna (step D3).
- the mobile station searches for a combination of transmitting antennas having the lowest selection index based on the estimated channel response (step D4).
- the mobile station determines whether or not the searched combination of transmission antennas is the same as the combination of transmission antennas currently in use (step D5). If the combination is the same, the mobile station does not notify the base station of transmission antenna selection information. When the next known signal is transmitted, the transmission antenna selection process is started.
- step D5 if the searched combination of transmission antennas is not the same as the combination of transmission antennas currently used, transmission antenna change information is transmitted to the base station (step D6).
- the base station receives the transmission antenna change information (step D7), and changes the transmission antenna based on the received transmission antenna change information (step D8).
- FIG. 18 is an explanatory diagram showing an example of a transmission frame in which each transmission antenna force of the radio transmitter of the base station according to the fourth embodiment is also transmitted.
- change the number of transmit antennas to be used. The case where it does not change is demonstrated.
- the base station transmits information data using Txl and Tx2, and ⁇ 3 transmits only known signals.
- the mobile station estimates the propagation path response formed by each transmission antenna from the received known signal, and when searching for a combination of transmission antennas having the lowest selection index for the estimated propagation path response power, Txl and Tx3 It detects that the combination power selection index is the lowest and the combination of transmission antennas, and notifies the base station by transmitting the selection information of the transmission antennas.
- the base station changes the combination of transmission antennas based on the transmission antenna selection information. Thereafter, the base station transmits information data using Txl and ⁇ 3.
- FIG. 19 is an explanatory diagram showing an example of a transmission frame transmitted from each transmission antenna cable of the radio transmitter of the base station according to the fourth embodiment.
- the base station transmits information data using Txl and ⁇ 2, and ⁇ 3 and ⁇ 4 transmit only known signals.
- the mobile station estimates the propagation path response formed by each transmission antenna from the received known signal, and searches for a combination of transmission antennas with the lowest estimated propagation path response power selection index.
- the case of changing from two transmit antennas to communication using three transmit antennas is shown.
- the correlation value of the combination of three transmit antennas is obtained, and the four transmit antenna force selection Search for the combination of the three transmit antennas with the lowest index.
- the combination power selection index of the transmitting antennas of Txl, ⁇ 2, and ⁇ 3 is the lowest.
- the mobile station notifies the searched transmission antenna selection information to the base station.
- the base station changes the combination of transmission antennas based on the transmission antenna selection information notified of the mobile station power. Thereafter, the base station transmits information data using Txl, ⁇ 2 and V ⁇ 3.
- the selection of the transmission antenna in the radio transmitter of the base station has been described for the case where all the transmission antennas also select a plurality of transmission antennas.
- the present invention is not limited to this case. Absent. For example, to reduce processing, from multiple transmit antennas to less! / ⁇ For selecting multiple transmit antennas! It can easily be applied.
- a wireless transmitter is equipped with 5 transmit antennas, from which 4 transmit antennas are narrowed down in advance, and 3 transmit antennas are selected from 4 filtered transmit antennas. In this case, the present invention can be applied. In other words, at the start of communication, the wireless transmitter periodically transmits known signals from the four transmitting antennas.
- the radio transmitter since the radio transmitter periodically transmits a known signal from all the transmission antennas to select the transmission antenna, all the transmission antennas are communicated. It is possible to change to a combination of transmitting antennas with the lowest selection index, and to reduce the error rate. In addition, without changing the number of transmission antennas, it is possible to select a transmission antenna in the case, and to select a transmission antenna when the number of transmission antennas is increased, thereby expanding the application range of the transmission antenna selection process of the present invention. .
- the radio transmitter in the base station and the radio receiver in the mobile station according to the fifth embodiment are all the transmission antennas of the radio transmitter in the base station according to the error of the radio receiver in the mobile station on the receiving side. Transmits a known signal from, and performs transmission antenna selection processing.
- the radio transmitter of the base station since the radio transmitter of the base station periodically transmits known signals from all the transmission antennas, the combination of the transmission antennas having the lowest selection index is selected periodically. Communication, but processing becomes complicated and power consumption increases. Therefore, the radio transmitter of the base station according to the fifth embodiment is a radio transmitter that transmits known signals from all transmission antennas at irregular intervals during communication, and there is no mobile station on the receiving side. All transmission antenna power according to the reception error of the line receiver When the timing for transmitting a known signal is determined and the reception error of the radio receiver of the mobile station is increased tl, the radio transmitter of the base station Transmits known signals from all transmit antennas and performs transmit antenna selection processing.
- a mobile station radio receiver when a reception error increases, transmits a known signal from all transmission antennas to a base station radio transmitter.
- the base station radio transmitter that requested transmission transmits all transmit antenna power known signals, and the base station radio transmitter and mobile station radio receiver transmit the transmission antenna.
- the selection process is performed.
- the mobile station radio receiver notifies the reception error result, and the base station radio transmitter notifies all the transmission antenna caps based on the received error result.
- it is determined whether or not to transmit a known signal If it is determined to transmit, a known signal is transmitted from all transmitting antennas, and a transmitting antenna selection process is performed.
- the reception error result is, for example, the number of errors and a NACK signal.
- the radio transmitter of the base station transmits known signals from all the transmission antennas according to the error of the radio receiver of the mobile station on the receiving side. Therefore, only when there is a high possibility that the error rate can be reduced by changing the transmission antenna, the selection process of the transmission antenna can be performed, and efficient communication can be performed.
- the radio transmitter in the base station and the radio receiver in the mobile station select the transmission antenna by further reducing the number of transmission antennas to be selected if the selection index is larger than the threshold value M.
- the device configurations of the radio transmitter in the base station and the radio receiver in the mobile station are the same as those in the other embodiments described above.
- Figure 20 shows a flowchart when two transmission antennas are selected.
- the lowest selection index is smaller than the threshold M. If it is not smaller than the threshold M, reduce the number of transmit antennas to be used and select one transmit antenna. If the lowest selection index is smaller than the threshold M, the combination of transmitting antennas with the lowest selection index is selected.
- the reception power at the reception side the reception SNR (Signal to Noise power Ratio) is large, and the transmission antenna is selected.
- step S2 the propagation path response is estimated for each transmission antenna (step SDo, and it is determined whether the propagation response estimation is completed for all transmission antennas (step S2). If not, the process moves to step S1.On the other hand, if the estimation of the propagation path response is completed for all the transmitting antennas in step S2. Determines whether the estimation of the propagation path response has been completed for all receiving antennas (step S3). If estimation of the propagation path response has not been completed for all the receiving antennas, the process proceeds to step S1, and if completed, a propagation path response vector is generated (step S4). Next, it is determined whether or not the generation of propagation path response vectors has been completed for all transmission antennas (step S5). If not completed, the process proceeds to step S4. On the other hand, when the generation of the propagation path response vector is completed for all the transmission antennas, the correlation value is calculated (step S6).
- step S7 it is determined whether or not the calculation of the correlation value has been completed for all the combinations of two transmitting antennas. If not completed, the process proceeds to step S6. On the other hand, when the calculation of correlation values for all combinations of two transmitting antennas is completed, it is determined whether or not the lowest selection index is smaller than the threshold value M (step S8). If the lowest selection index is not smaller than the threshold M, the number of transmitting antennas is set to one (step S9). On the other hand, if the lowest selection index is smaller than the threshold value M, the selection index is the lowest and a combination of transmission antennas is selected (step S10), and the process ends.
- Figure 21 shows a flowchart for selecting three or more transmit antennas.
- the threshold value M If the lowest selection index is not smaller than the threshold M, perform the calculation again when selecting two transmitting antennas by reducing the number of transmitting antennas used.
- the correlation value calculated for all two combinations is newly used as a selection index, and the combination of transmit antennas with the lowest selection index is selected.
- the lowest selection index is smaller than the threshold M, the transmission antenna combination with the lowest selection index is selected.
- the channel response is estimated for each transmitting antenna (step T D o ). Then, it is determined whether or not the propagation path response estimation has been completed for all transmitting antennas (step ⁇ 2). If not completed, the process proceeds to step T1. On the other hand, if the estimation of the propagation path response is completed for all the transmitting antennas in step ⁇ 2, it is determined whether the estimation of the propagation path response is completed for all the receiving antennas (step ⁇ 3). If channel response estimation has not been completed for all receiving antennas, the process proceeds to step T1, and if completed, a channel response vector is generated (step ⁇ 4). Next, it is determined whether or not the generation of propagation path response vectors has been completed for all transmission antennas (step ⁇ 5). If not completed, the process proceeds to step ⁇ 4. On the other hand, when generation of the propagation path response vector is completed for all transmission antennas, the correlation value is calculated (step ⁇ 6).
- step ⁇ 7 it is determined whether or not the calculation of the correlation value is completed for all the combinations of two transmitting antennas. If not completed, the process proceeds to step ⁇ 6. On the other hand, when the calculation of correlation values for all combinations of two transmitting antennas is completed, the sum of all correlation values is calculated according to the number of transmitting antennas used (step ⁇ 8). Next, it is determined whether or not the calculation of the sum of correlation values has been completed for all combinations (step ⁇ 9), and if not completed, the process proceeds to step ⁇ 8. On the other hand, when the calculation of the sum of correlation values is completed for all combinations, it is determined whether or not the lowest selection index is smaller than the threshold value ⁇ ⁇ ⁇ ⁇ (step T10).
- step T11 the number of transmitting antennas is decreased (step T11), and the process proceeds to step ⁇ 8.
- the selection index is the lowest and the transmission antenna combination is selected (step T12), and the process ends.
- a transmission antenna can be selected flexibly according to the correlation of the propagation channels, and good communication quality can be maintained.
- the selection index is smaller than the threshold value N, the number of transmission antennas to be selected is further increased to select transmission antennas.
- the device configurations of the radio transmitter in the base station and the radio receiver in the mobile station are the same as those in the other embodiments described above.
- Figure 22 shows a flowchart for selecting three or more transmitting antennas.
- the lowest selection index is a force greater than the threshold N. If the lowest selection index is not greater than the threshold N, repeat the calculation when selecting the number of transmit antennas by increasing the number of transmit antennas used. The sum of correlation values is calculated according to the four transmit antennas used, and the same selection process as above is performed. It is also possible to increase the number of transmission antennas to be selected by increasing the number by two or more according to the predetermined N value in the first threshold judgment. If the lowest selection index is greater than the threshold N, select the transmit antenna combination with the lowest selection index.
- step QD o the propagation path response is estimated for each transmission antenna (step QD o and it is determined whether the propagation response estimation is completed for all transmission antennas (step Q2), If not, the process moves to step Q1.On the other hand, if the estimation of the propagation path response is completed for all the transmitting antennas in step Q2, the estimation of the propagation path response is completed for all the receiving antennas. (Step Q3) If channel response estimation has not been completed for all receiving antennas, the process proceeds to Step Q1, and if completed, a channel response vector is generated. (Step Q4) Next, it is determined whether or not the generation of propagation path response vectors has been completed for all transmit antennas (Step Q5). . On the other hand, if the generation of the channel response vectors for all transmit antennas has been completed, correlation Calculate the value (step Q6).
- step Q7 it is determined whether or not the calculation of the correlation value has been completed for all the combinations of two transmitting antennas. If not, the process proceeds to step Q6. On the other hand, when the calculation of correlation values for all two transmission antenna combinations is completed, the sum of all correlation values is calculated according to the number of transmission antennas used (step Q8). Next, it is determined whether or not the calculation of the sum of correlation values has been completed for all the combinations (step Q9). If not, the process proceeds to step Q8. On the other hand, when the calculation of the sum of correlation values is completed for all combinations, it is determined whether or not the lowest selection index is greater than the threshold N (step Q10).
- step Q11 If the lowest selection index is not greater than the threshold N, increase the number of transmit antennas (step Q11) and proceed to step Q8. On the other hand, if the lowest selection index is greater than the threshold value N in step Q10, the selection index is the lowest and the combination of transmitting antennas is selected (step Q12), and the process ends.
- a transmission antenna can be selected flexibly according to the correlation of the propagation channel, and further communication can be achieved by increasing the number of transmission antennas used for transmission diversity.
- the transmission capacity can be further increased by improving the quality or increasing the number of transmission antennas used for spatial multiplexing.
- the selection index can be calculated easily and quickly by the selection index calculation method described above, it is possible to calculate the selection index by other calculation methods and apply it to the present invention. It is.
- the radio transmitter of the base station according to the eighth embodiment includes a plurality of transmission antennas, calculates a transmission antenna selection index for each subcarrier, and has the best selection index for each subcarrier. And wirelessly transmit information using the selected transmit antenna for each subcarrier. This improves the error rate at the mobile station on the receiving side.
- FIG. 23 is a block diagram showing a schematic configuration of the radio transmitter of the base station according to the eighth embodiment.
- This radio transmitter corresponds to the transmitter 2 of the radio communication device 1 shown in FIG. 8th
- the transmission unit 2 performs space division multiplex transmission using a plurality of transmission antennas Txl to TxN.
- Transmission control section 221 performs overall control related to transmission by transmission section 2 as a wireless transmitter, and transfers information data transferred from the upper layer to the lower layer.
- the channel response information formed by each transmission antenna notified from the radio receiver of the mobile station that is the communication partner is output to selection index calculation section 222.
- the selection index calculation unit 222 generates a channel response vector based on the channel response information input from the transmission control unit 221. Based on the generated channel response vector, a selection index for selecting a transmission antenna combination is calculated for each subcarrier. For example, as a selection index, a correlation value between transmission antennas, SNR for each transmission antenna, and SINR are used. The selection index calculation unit 222 calculates selection indexes for all combinations of transmission antennas that can be selected for each subcarrier, and then outputs the result to the transmission antenna allocation detection unit 223.
- the transmission antenna allocation detection unit 223 compares the selection indexes based on the selection index results input from the selection index calculation unit 222, and determines the combination of transmission antennas having the best selection index for each subcarrier. To detect.
- the best selection index means the lowest when the selection index is a correlation value, and the highest when the selection index is SNR or SINR.
- Transmit antenna assignment detection section 223 outputs the assignment result of the combination of transmit antennas for each subcarrier to subcarrier data assignment section 224 and pilot signal generation section 225.
- FIG. 3 (a) is a diagram showing an outline of a propagation path response formed by a wireless transmitter that performs transmission using three transmitting antennas and a wireless receiver that performs reception using three receiving antennas.
- Txl, ⁇ 2, and ⁇ 3 indicate transmission antennas
- Rxl, Rx2, and Rx3 indicate reception antennas, respectively.
- H is send
- the channel response formed between the lm antenna and the receiving antenna is shown.
- “h” indicates the number of the transmitting antenna
- “m” indicates the number of the receiving antenna.
- Tx and Rx are omitted from the suffix “h”.
- the propagation path response information also has the information power of these propagation path responses.
- Fig. 3 (a) nine channel responses are formed.
- the propagation path response formed by Txl is h, h, h for the receiving antennas Rxl, Rx2, and Rx3, respectively.
- a tuttle is defined as a channel response vector of each transmitting antenna.
- the propagation path response vector of each transmission antenna is expressed by the above equation (1).
- Selection index calculation section 222 calculates the correlation between the two transmission antennas based on the generated propagation path response vector.
- a vector is obtained by conjugate multiplication of the channel response vector formed by one transmitting antenna and the channel response vector formed by the other transmitting antenna. Divide the absolute value of the propagation path response vector.
- selection index value is simply referred to as “selection index”).
- the transmission antenna allocation detection unit 223 compares the selection indexes based on the selection index input from the selection index calculation unit 222, selects the combination of transmission antennas having the lowest selection index, and selects the transmission antenna Generate combination allocation information. After generating transmission antenna combination assignment information for all subcarriers, Is output to the subcarrier data allocation unit 224 as a result of allocation of combinations of the transmission antennas.
- the selection index calculation unit 222 generates a channel response vector based on the channel response information input from the transmission control unit 221.
- FIG. 3 (b) is a diagram showing an outline of a propagation path response formed by a wireless transmitter that performs transmission using four transmitting antennas and a wireless receiver that performs reception using three receiving antennas. In the case of Fig. 3 (b), 12 propagation path responses are formed. The propagation path response vector of each transmission antenna is expressed by the above equation (3).
- Selection index calculation section 222 first calculates a correlation value between two transmission antennas based on the generated propagation path response vector. A vector multiplication of the conjugate response of the channel response vector formed by one transmitting antenna and the channel response vector formed by the other transmitting antenna is performed 1 ⁇ , and each value is calculated from the multiplied values. Divide the absolute value of the channel response vector. The correlation value p between the antennas is expressed by the above equation (4).
- a selection index is defined based on the correlation value between the two transmission antennas derived as described above.
- the wireless transmitter selects three or more transmit antennas from multiple transmit antennas, the sum total of all possible correlation values between the two transmit antennas is used as the selection index according to the number of transmit antennas used. .
- the correlation value for each combination of transmission antennas when the wireless transmitter selects three transmission antennas from the four transmission antennas is expressed by Equation (5) above.
- p is the channel response vector formed by the transmitting antenna Txl and the transmitter
- the transmission antenna allocation detection unit 223 compares the selection indexes based on the selection index input from the selection index calculation unit 222, selects the combination of transmission antennas with the lowest selection index, and sets the transmission antennas. Generate combination allocation information. All sub-carriers If the transmission antenna combination allocation information is generated for the carrier, it is output to the subcarrier data allocation unit 224 as the transmission antenna combination allocation result for each subcarrier.
- Subcarrier data allocation section 224 transmits each piece of information data input from transmission control section 222 based on the allocation result of the combination of transmission antennas for each subcarrier input from transmission antenna allocation detection section 223. Assigned to the modulation part 226-1 to 226-N of the antenna system and output. Modulation sections 26-1 to 226-N modulate the information data input from subcarrier data allocation section 224 and output a modulated data signal.
- pilot signal generation section 225 Based on the assignment result of the combination of transmission antennas for each subcarrier input from transmission antenna assignment detection section 223, pilot signal generation section 225 generates a pilot signal in which pilot data is assigned only to the subcarrier used for transmission. Output to the spatial multiplexing processing units 27-1 to 227-N of each transmission antenna system. Spatial multiplex processing units 227-1 to 227 -N perform transmission by performing space division multiplex transmission from the modulated data signal input from modulation units 226-1 to 226 -N and the pilot signal input from pilot signal generation unit 225. Generate and output a signal.
- IFFT228-1 to 228-N performs inverse Fourier transform on the transmission signal input from spatial multiplexing processing units 227-1 to 227-N, converts it to a transmission signal in the time domain, and outputs it.
- Frequency converters 229-1 to 229-N up-convert the transmission signals input from IFFT228-1 to 228-N to radio frequencies and output them. Transmit antennas Txl to TxN transmit upconverted transmission signals.
- FIG. 24 is a block diagram showing a schematic configuration of the radio receiver of the mobile station according to the eighth embodiment.
- This wireless receiver corresponds to the receiving unit 13 of the wireless communication device 11 shown in FIG.
- the receiving unit 13 has a function of receiving a transmission signal transmitted by space division multiplexing using a plurality of transmission antennas and separating / detecting the signal from a radio transmitter of a base station on the transmission side. ing.
- the receiving antennas Rxl to RxM receive transmission signals that have undergone propagation path fluctuations.
- Frequency change ⁇ 241— 1 to 241—M down-converts the received signal input from receiving antennas Rxl to RxM and outputs it.
- the symbol timing playback unit 242 has an FFT window type Ming is detected and output. For example, the timing indicating the peak of the correlation value is detected as the FFT window timing by the correlation calculation of the known signal sequence and the received signal sequence or the correlation calculation of the data interval and the guard interval interval.
- FFT 243-1 to 243- M performs Fourier transform of the down-converted received signal based on the FFT window timing input from symbol timing reproduction unit 242 and converts the received signal into the frequency domain. Output.
- the propagation path response estimation unit 244 estimates and outputs the propagation path response based on the pilot signal section of the received signal input from the FFTs 243-1 to 243-M.
- the signal separation detection section 245 Based on the propagation path response input from the propagation path response estimation section 244, the signal separation detection section 245 performs spatial division on the data section of the received signal input from the FFTs 243-1 to 243-M. The multiplexed signal is separated and detected, and the signal transmitted from each transmitting antenna is detected.
- the demodulating units 246-1 to 246-M demodulate the received signal input from the signal separation detecting unit 245 based on the modulation method and coding rate used in the modulation unit of each corresponding transmitting antenna system, Generate demodulated data.
- the reception control unit 247 performs overall control related to reception of the reception unit 13 as a radio receiver in the mobile station, and the demodulated data from the demodulation units 246-1 to 246-M transferred from the lower layer Is transferred to the upper layer as information data.
- the transmission control unit of the radio transmitter of the radio communication device having the radio receiver that estimated the channel response The communication of the channel response input from the channel response estimation unit 244 is controlled.
- Figure 25 shows an example of a known signal that can estimate the channel response of each transmit antenna.
- Fig. 25 (a) shows an orthogonal pilot signal in which the sequence for each transmitting antenna is orthogonal
- Fig. 25 (b) shows a known signal using the principle of space-time coding
- Fig. 25 (c) Shows a configuration in which a known signal is transmitted from only one transmission antenna at the same time.
- “arrow t” indicates the passage of time.
- FIG. 26 is a flowchart for selecting a combination of transmission antennas according to the eighth embodiment. A chart is shown.
- a selection index is calculated for each subcarrier from the channel response information notified from the radio receiver in the radio transmitter (step PP1).
- the selection indices are compared, and the combination of transmission antennas with the best selection indices is selected (step PP3).
- the selection index is the smallest, the combination of transmission antennas is selected as the best combination of transmission antennas, and the selection is performed when SNR or SINR is used as the selection index.
- the index is the largest, and the combination of transmission antennas is selected as the best combination of transmission antennas.
- step PP4 it is determined whether or not transmission antenna combinations have been selected for all subcarriers. If transmission antenna combinations have not been selected for all subcarriers, step PP1 Migrate to On the other hand, when transmission antenna combinations have been selected for all subcarriers, data allocation for each subcarrier is performed for each transmission antenna system (step PP5).
- the selection of the combination of transmission antennas for each subcarrier in the flowchart described above is a power that describes the case where a plurality of transmission antennas are selected from all the transmission antennas of the wireless transmitter. It is not limited to.
- the present invention can be easily applied to a case where a plurality of transmitting antennas are selected with a smaller number of transmitting antennas in order to reduce processing. For example, when a wireless transmitter has five transmitting antennas, and the four transmitting antennas are narrowed in advance, and the three transmitting antennas are selected from the four transmitting antennas that have been narrowed down, the present invention Applicable.
- the present invention is not limited to multiple ratios such as maximum ratio combining transmission diversity and space-time code transmission transmission diversity.
- the present invention can be applied to a configuration in which transmission is performed using a transmission antenna.
- a transmission weighting synthesis unit that performs transmission weighting or a space-time code key unit that performs space-time code keying is provided. is there. With such a configuration, the transmission antenna combination selection processing of the present invention can be performed.
- a radio receiver provided with a reception synthesis unit can be configured.
- the transmission antenna combination selection processing of the present invention can be applied.
- This reception combining unit performs maximum ratio combining and space-time code decoding processing according to the transmission method on the transmission side.
- the transmission antenna combination selection processing of the present invention can be applied even in a configuration using both space division multiplexing and transmission diversity.
- a modulation unit 226-1 to 226 -N and a demodulation unit 246-1 to 246 -M are provided for each transmission / reception antenna system.
- the present invention can also be applied to a configuration in which a single modulation unit 226 and demodulation unit 246 are provided in common.
- the modulation unit 226 may be provided before the subcarrier data allocation unit 224.
- the present invention can also be applied to a configuration in which modulation units 226 1 to 226-N and demodulation units 246-1 to 246-M are provided for each group of transmission / reception antenna systems.
- the channel response estimated by the wireless receiver that is the receiver 3 of the wireless communication device 1 shown in FIG. It is also possible to calculate the selection index of the combination of transmission antennas of the wireless transmitter that is the transmitter 2 of the same wireless communication device 1 shown in FIG.
- the present invention is limited to the case where the propagation path response force selection index is calculated. Then, it can be applied to the case of calculating other information power selection indicators.
- a combination of transmission antennas that can be used when communication is performed using a plurality of transmission antennas is selected. Since it is selected for each subcarrier, the optimal combination of transmission antennas can be selected for each subcarrier, and the error rate on the receiving side can be improved.
- the selection index is calculated by the radio receiver of the mobile station that is the receiving side, and the selection information of the combination of transmitting antennas is transmitted to the radio transmitter of the base station that is the transmitting side.
- the base station radio transmitter selects the combination of transmit antennas for each subcarrier based on the notified information.
- FIG. 27 is a diagram showing a configuration of the transmission unit 2 as a radio transmitter in the base station according to the ninth embodiment.
- FIG. 28 is a diagram showing a configuration of the receiving unit 3 as a radio receiver in the mobile station according to the ninth embodiment.
- the difference from the eighth embodiment is that the radio receiver of the mobile station performs the selection process of the combination of transmission antennas, and notifies the base station radio transmitter of selection information regarding the combination of transmission antennas.
- the base station radio transmitter selects the combination of transmission antennas based on the notified selection information regarding the combination of transmission antennas.
- the selection index calculation unit 222 and the transmission antenna allocation detection unit 223 in FIG. 23 are configured in the radio receiver (reception unit) of the mobile station of the communication partner, and selection information regarding the combination of transmission antennas is transmitted from the mobile station to the base station. The station is notified.
- transmission control section 221 controls processing of subcarrier data allocation section 224 and pilot signal generation section 225 based on the selection information regarding the notified combination of transmission antennas.
- the subcarrier data allocation unit 224 receives the information data input from the transmission control unit 221 on the basis of the control signal regarding selection of the transmission antenna combination for each subcarrier input from the transmission control unit 221. Assigned to the modulation sections 226-1 to 226-N of the system and output.
- the pilot signal generation unit 225 transmits each pilot signal in which pilot data is allocated only to the subcarriers used for transmission, based on the control signal regarding selection of the transmission antenna combination for each subcarrier input from the transmission control unit 221. Output to 227-1 to 227-N of spatial multiplexing processor of antenna system.
- FIG. 28 Eighth embodiment of the radio receiver of the mobile station according to the ninth embodiment shown in Fig. 28 A different part from the radio receiver according to FIG.
- a selection index calculation unit 250 and a transmission antenna allocation detection unit 251 are newly configured.
- the processing of each unit is the same as that configured by the wireless transmitter according to the eighth embodiment.
- Reception control section 247 notifies the selection information regarding the combination of transmission antennas for each subcarrier output from transmission antenna allocation detection section 251 to the base station on the transmission side using transmission section 12 of the mobile station.
- steps PP1 to PP4 are performed by the radio transmitter of the base station in the eighth embodiment, but steps PP1 to PP4 are performed by the radio receiver of the mobile station in the ninth embodiment.
- the selection index calculation unit 250 is configured as a radio receiver, and the transmission antenna allocation detection unit 251 includes a transmission antenna allocation detection unit 223 as illustrated in FIG. It can also take the form comprised by the radio transmitter of a base station.
- the information notified from the mobile station radio receiver to the base station radio transmitter is selection index information of a combination of transmission antennas.
- the radio transmitter of the base station compares the selection indices based on the notified transmission antenna combination selection index information, and selects the best transmission antenna combination.
- the information notified from the radio receiver of the mobile station to the radio transmitter of the base station is the selection information regarding the combination of transmission antennas that is not the propagation path response information. Therefore, the amount of feedback information to be notified can be reduced, and the overhead can be reduced.
- the radio transmitter of the base station collects a plurality of subcarriers into one block and selects a combination of transmission antennas.
- FIG. 29 is a diagram illustrating a configuration of a radio transmitter of the base station according to the tenth embodiment.
- the difference from the radio transmitter according to the eighth embodiment is that a block calculation unit 260 is newly configured.
- the block calculation unit 260 processes all subcarriers as one block, and determines which transmission antenna combination is good for each block. A new block selection index is calculated.
- specific processing for selecting a combination of transmission antennas for each block in the block calculator 260 will be described.
- the block calculation unit 260 determines the combination of transmission antennas having the best selection index for each subcarrier, and calculates the total number of subcarrier determination results in the block for all possible combinations of transmission antennas. Calculate and output as block selection index.
- FIG. 30 (a) An example of selecting a combination of transmitting antennas in the case of performing the above processing will be shown.
- Fig. 30 (a) this is shown when a radio transmitter that performs transmission using three transmitting antennas is selected from two transmitting antennas. .
- one block is composed of six subcarriers as shown in FIG. 30 (b) is shown.
- Tx represents the transmitting antenna
- the number following ⁇ represents the transmitting antenna number.
- sub represents a subcarrier
- the number following sub represents a subcarrier number.
- the block calculation unit 260 outputs these values to the transmission antenna allocation detection unit 223 as block selection indices.
- the transmission antenna allocation detection unit 223 compares the block selection indices and selects the most Txl & Tx2 combination. Then, it notifies the subcarrier data allocation section 224 and the pilot signal generation section 225 that the subcarriers in this block allocate data to the antenna system of Txl & Tx2.
- the highest ranking is assigned to the combination of transmission antennas for each subcarrier, and the higher ranking is performed.
- the total points are calculated for each transmission antenna combination in the block, and the transmission antenna combination is selected for each block using the calculated total points.
- the block calculator 260 ranks the highest rank from the best combination of transmission antennas based on the selection index in each subcarrier. Next, the total points in the block of points set in advance according to the rank are calculated for each combination of transmitting antennas and output as a block selection index.
- the total points for the combination of transmission antennas for each subcarrier indicate the result of FIG. That is, subl shows 3 points for the combination of Txl & ⁇ 2, 2 points for the combination of xl ⁇ 2 & ⁇ 3, and 1 point for the combination of Tx3 & Txl. Similarly, the points shown in the figure for sub2 to sub6 Is shown. In this case, the ranking of the combination of transmission antennas for each subcarrier is performed, and the total points are calculated. 12
- the block calculation unit 260 outputs these values as a block selection index to the transmission antenna allocation detection unit 223, and the transmission antenna allocation detection unit 223 compares the input block selection indexes to calculate the total points. Select the combination of Txl & Tx2 with the largest number. Then, the subcarrier data allocation unit 224 and the pilot signal generation unit 225 are notified that the subcarrier of this block allocates data to the antenna system of Txl & Tx2.
- the points for each rank set here are values used for ease of explanation, and the present invention can be applied by setting the points arbitrarily. If the total points are equal, The subcarrier alone has the best selection index, the subcarrier count is the highest in the block, the means to select the combination of transmission antennas, the subcarrier alone has the worst selection index, and the subcarrier count is the smallest in the block This can be dealt with by finding a way to select the combination of antennas.
- the block calculation unit 260 calculates a block selection by calculating an average value in the block for every combination of transmission antennas to be taken using the selection index for each subcarrier input from the selection index calculation unit 222. Output as an indicator.
- X indicates a selection index for each subcarrier
- the subscript on the left side of X indicates a subcarrier number
- the code on the right side indicates a combination number of transmission antennas.
- the combination number of the transmission antenna of Txl & Tx2 is 1
- the combination number of the transmission antenna of ⁇ 2 & ⁇ 3 is 2
- the combination number of the transmission antenna of Tx3 & Txl is 3.
- the average values of the selection indices in the block calculated by the block calculation unit 260 are X, ⁇ 2 & ⁇ 3 force, and Tx3 & Txl force.
- the block calculator 260
- the transmission antenna allocation detection unit 223 compares the block selection indexes and selects, for example, the combination of Txl & Tx2 as the best combination. Then, it notifies the subcarrier data allocation section 224 and the pilot signal generation section 225 that the subcarriers of this block allocate data to the antenna system of Txl & ⁇ 2. Note that the block selection index is the best when the selection index is a correlation value, and the highest when the selection index is SNR or SINR.
- the number of subcarriers with the best selection index for each subcarrier alone is the largest in the block, and means for selecting a combination of transmission antennas, This can be dealt with by selecting means for selecting the combination of transmitting antennas that have the worst selection index and the smallest number of subcarriers in the block.
- the present invention can also be applied to a form in which the total value is not used as the block selection index but the average value of the selection indices for each subcarrier in the block.
- the present invention can also be applied to a mode in which a weighted average that is not a simple average is used as the block selection index in the averaging process of the selection index for each subcarrier in the block. For example, in the region where the correlation value between the propagation channels is lower than a certain value, the increase in the signal error on the receiving side as the correlation value increases shows a gradual trend. In the meantime, the increase in signal errors on the receiving side as the correlation value increases shows a sharp tendency. Predetermined weights can be set for each correlation value area, and the values weighted according to the correlation values can be averaged in the block and used as a block selection index.
- required SNR and SINR for achieving a certain error rate in a certain modulation scheme and code rate are obtained by a predetermined calculation. Unless an abrupt change in communication status or an abnormal situation is assumed, SNR and SINR higher than the required SNR and SINR will be redundant. In order to avoid the redundant processing becoming dominant in the averaging process, the maximum value is set for the selection index, and it is averaged within the block and used as a block selection index.
- the force shown for selecting two transmitting antennas from all three transmitting antennas is four or more transmitting antennas, and there are three antennas to select.
- the present invention can be applied even when there are more than this.
- FIG. 34 shows a flowchart for selecting a combination of transmitting antennas according to the eighth embodiment in the tenth embodiment.
- the block selection index the total number of the total selection results or the total points of the points ranked according to the selection results is used.
- the subkey is determined from the propagation path response information notified from the wireless receiver.
- a selection index is calculated for each carrier (step QQ1).
- comparison of selection indices is performed, and a combination of transmission antennas having the best selection index is selected (step QQ3).
- the combination of the transmission antennas with the smallest selection index is the best, and the combination of the transmission antennas.
- the selection index is Biggest! The combination of the transmitting antennas is the best, and the stringing of the transmitting antennas is the best.
- step QQ4 it is determined whether or not transmission antenna combinations have been selected for all subcarriers (step QQ4), and transmission antenna combinations have been selected for all subcarriers. Move on to step QQ1.
- step QQ5 when transmission antenna combinations have been selected for all subcarriers, block selection indices are calculated for each transmission antenna combination (step QQ5), block selection indices are compared, and block selection is performed. Select the combination of transmitting antennas with the best index (step QQ6). Here, it is determined whether or not the transmission antenna combination has been selected for all the blocks (step QQ7), and if the transmission antenna combination has been selected for all the blocks, step QQ5.
- step QQ8 when the combination of transmission antennas has been selected for all blocks.
- FIG. 35 shows a flowchart for selecting a combination of transmitting antennas according to the ninth embodiment in the tenth embodiment.
- the average value or the total value of the selection indices is used as the block selection index.
- a selection index is calculated for each subcarrier from the propagation path response information notified from the wireless receiver to the wireless transmitter (step RR1).
- the process proceeds to step RR1.
- the selection indices for all transmission antenna combinations have been calculated, it is determined whether or not the selection index for transmission antenna combinations has been calculated for all subcarriers (step RR3), and all subcarriers are calculated.
- step RR3 the selection index for transmission antenna combinations has been calculated for all subcarriers
- step RR4 when the selection index of the transmission antenna combination is calculated for all subcarriers, the block selection index is calculated for each transmission antenna combination (step RR4), and the block selection index is compared. To select the combination of transmit antennas with the best block selection index (step RR5). Here, for all the blocks, it is determined whether or not the power of selecting the combination of transmission antennas has been completed (step R R6). If the combination of transmission antennas has not been selected for all blocks, step RR4 Migrate to On the other hand, when transmission antenna combinations have been selected for all blocks, subcarrier data allocation for each block is performed for each transmission antenna system (step RR7).
- the radio transmitter compares a block selection index with a threshold, changes the block size according to the comparison result, and selects a combination of transmitting antennas.
- FIG. 36 is a diagram illustrating the configuration of the radio transmitter of the base station according to the eleventh embodiment.
- the difference from the radio transmitter according to the tenth embodiment is that a block parameter detector 270 is newly configured.
- the block parameter detection unit 270 compares the block selection index input from the block calculation unit 260 with a threshold value, and outputs a block size change control signal to the block calculation unit 260 and the transmission antenna allocation detection unit 223 according to the comparison result. To do. If the block calculation unit 260 is notified to greatly change the block size based on the block size change control signal input from the block parameter detection unit 270, the block selection unit 260 selects a block with an increased number of subcarriers.
- the block selection index is again calculated and output for the block with the reduced number of target subcarriers, and the block size is not changed. If so, the calculation of the block selection index is continued with the block as it is.
- FIG. 37 is a flowchart in the case where processing for reducing the block size of the radio communication device of the base station according to the eleventh embodiment is provided.
- the combination of transmit antennas is selected for each block using the average value of the selection indices calculated for each subcarrier as the block selection index! I will explain in a moment.
- a selection index is calculated for each subcarrier from the propagation path response information notified from the wireless receiver to the wireless transmitter (step SS1).
- the selection indices for all transmission antenna combinations have been calculated, it is determined whether or not the selection index for transmission antenna combinations has been calculated for all subcarriers (step SS3), and all subcarriers are calculated. Then, finish calculating the selection index for the combination of transmit antennas. If not, go to step SSI.
- the block selection index for each combination of transmission antennas is calculated (step SS4).
- the calculation of the block selection index is started again from the first block.
- the block selection index is better than the threshold W, the block selection index is compared, and the combination of transmitting antennas with the best block selection index is selected (step SS7).
- a good block selection index means that the correlation value is smaller than the threshold W when it is used as the selection index, and it is larger than the threshold W when SNR or SINR is used.
- step SS8 it is determined whether or not the combination of transmission antennas has been selected for all blocks. If the combination of transmission antennas has not been selected for all blocks, the process proceeds to step SS4. To do. On the other hand, when the combination of transmission antennas has been selected for all blocks, subcarrier data allocation for each block is performed for each transmission antenna system (step SS9).
- FIG. 38 is a flowchart in the case where processing for increasing the block size of the radio communication device of the base station according to the eleventh embodiment is provided.
- the combination of transmit antennas is selected for each block using the average value of the selection indices calculated for each subcarrier as the block selection index! I will explain in a moment.
- a selection index is calculated for each subcarrier from the channel response information notified from the wireless receiver to the wireless transmitter (step TT1).
- the selection indices for all transmission antenna combinations have been calculated, it is determined whether or not the selection index for transmission antenna combinations has been calculated for all subcarriers (step ⁇ 3), and all subcarriers are calculated. Then, finish calculating the selection index for the combination of transmit antennas. If not, go to step TT1.
- the block selection index for each combination of transmission antennas is calculated (step TT4).
- the block selection index is worse than the threshold value ⁇ , the block selection index is compared, and the combination of transmitting antennas with the best block selection index is selected (step ⁇ 7).
- a bad block selection index means that the correlation value is larger than the threshold value ⁇ ⁇ when the selection index is used, and it is smaller than the threshold value Y when SNR or SINR is used.
- step TT8 it is determined whether transmission antenna combinations have been selected for all blocks. If transmission antenna combinations have not been selected for all blocks, the process proceeds to step TT4. To do. On the other hand, when the combination of transmission antennas has been selected for all blocks, subcarrier data allocation for each block is performed for each transmission antenna system (step TT9).
- step TT5 the flowchart of FIG. 37
- step TT6 the process of step TT5 of the flowchart of FIG. This can be accommodated by extending step TT6.
- FIG. 39 shows the block size changed according to the selection index of the radio transmitter of the base station according to the eleventh embodiment. It is a figure which shows the structure in the case of changing.
- selection index calculation section 222 outputs the calculated selection index together with block calculation section 260 to block parameter detection section 270.
- the block parameter detection unit 270 compares the thresholds based on the selection index input from the selection index calculation unit 222, controls the block size, and transmits the control signal to the block calculation unit 260 and the transmission antenna allocation detection unit 23. Output to.
- FIG. 40 is a diagram showing a configuration when the block size is changed according to the error frequency of the received data of the radio transmitter of the base station according to the eleventh embodiment.
- Block parameter detection section 270 controls the block size based on the error frequency of the received data input from transmission control section 221 and outputs a control signal to block calculation section 260 and transmission antenna allocation detection section 223.
- the block parameter detection unit 270 performs control so as to decrease the block size when the error frequency of the received data increases, and increases the block size when the error frequency of the received data decreases.
- the block parameter detection unit 270 may be configured to change the block size by combining the block selection index, the selection index, and the error frequency of the received data.
- the block size is changed according to the block selection index, the selection index, or the error frequency of the received data, so that the reception quality is maintained, Complexity can be reduced.
- Complexity can be reduced.
- FIG. 1 is a block diagram showing a schematic configuration of a wireless communication device according to a first embodiment.
- FIG. 2 is a block diagram showing a schematic configuration of a wireless transmitter according to the first embodiment.
- FIG. 3 (a) is a diagram showing a channel response formed by a radio transmitter having three transmitting antennas and a radio receiver having three receiving antennas. (B) is a diagram showing a channel response formed by a wireless transmitter having four transmitting antennas and a wireless receiver having four receiving antennas.
- FIG. 4 is a block diagram showing a schematic configuration of a wireless communication device according to the first embodiment.
- FIG. 5 is a block diagram showing a schematic configuration of a radio receiver according to the first embodiment.
- FIG. 6 is a diagram showing a selection process of transmission antennas of a radio transmitter of a base station and a radio receiver of a mobile station according to the first embodiment.
- FIG. 7 is a diagram showing a transmission frame of the radio transmitter of the base station according to the first embodiment.
- FIG. 8 (a) is a diagram showing a configuration of a known signal, and an orthogonal pilot signal in which a sequence for each transmission antenna is orthogonal. (B) is a diagram showing the structure of a known signal using the principle of space-time coding. (C) is a figure which shows the structure of a known signal in the case of transmitting a known signal only for one transmitting antenna force at the same time.
- FIG. 9 is a flowchart showing operations of the radio transmitter of the base station and the radio receiver of the mobile station according to the first embodiment.
- FIG. 10 is a flowchart showing the operation of the radio transmitter of the base station and the radio receiver of the mobile station according to the first embodiment.
- FIG. 11 is a block diagram showing a schematic configuration of a radio transmitter of a base station according to a second embodiment.
- FIG. 12 is a block diagram showing a schematic configuration of a radio receiver of a mobile station according to the second embodiment.
- FIG. 13 is a diagram showing a selection process of transmission antennas of the radio transmitter of the base station and the radio receiver of the mobile station according to the second embodiment.
- FIG. 14 shows a radio transmitter in a base station and a mobile station in a base station according to the third embodiment. It is a schematic explanatory drawing about the process regarding selection of the transmission antenna of the communication system comprised from a line receiver.
- FIG. 16 is an explanatory diagram showing an example of a transmission frame transmitted from each transmission antenna cable of the wireless transmitter according to the fourth embodiment.
- FIG. 18 is an explanatory diagram showing an example of a transmission frame transmitted from each transmission antenna of the radio transmitter of the base station according to the fourth embodiment.
- FIG. 19 is an explanatory diagram showing an example of a transmission frame transmitted from each transmission antenna of the radio transmitter of the base station according to the fourth embodiment.
- FIG. 20 is a flowchart showing the operation of the radio transmitter of the base station and the radio receiver of the mobile station according to the sixth embodiment.
- FIG. 23 is a block diagram showing a schematic configuration of the wireless transmitter according to the eighth embodiment.
- FIG. 24 is a block diagram showing a schematic configuration of the wireless receiver according to the eighth embodiment.
- FIG. 25 (a) is a diagram showing an orthogonal pilot signal having a known signal configuration and a sequence for each transmission antenna having an orthogonal relationship. (B) is a diagram showing the structure of a known signal using the principle of space-time coding. (C) is a figure which shows the structure of a known signal in the case of transmitting a known signal only for one transmitting antenna force at the same time.
- FIG. 27 is a block diagram showing a schematic configuration of the wireless transmitter according to the ninth embodiment.
- FIG. 28 is a block diagram showing a schematic configuration of a wireless receiver according to a ninth embodiment.
- FIG. 29 is a block diagram showing a schematic configuration of a wireless transmitter according to a tenth embodiment.
- FIG. 30 (a) is a schematic diagram of a wireless transmitter for explaining a block selection index.
- (b) is a diagram showing a subcarrier constituting one block by a wireless transmitter for explaining a block selection index.
- FIG. 31 is an explanatory diagram showing a block selection index.
- FIG. 32 is an explanatory diagram showing a block selection index.
- FIG. 33 is an explanatory diagram showing a block selection index.
- FIG. 34 is a flowchart showing the operations of the wireless transmitter and the wireless receiver according to the tenth embodiment.
- FIG. 35 is a flowchart showing the operations of the wireless transmitter and the wireless receiver according to the tenth embodiment.
- FIG. 36 is a block diagram showing a schematic configuration of a wireless transmitter according to an eleventh embodiment.
- FIG. 37 is a flowchart showing the operations of the wireless transmitter and the wireless receiver according to the eleventh embodiment.
- FIG. 38 is a flowchart showing the operations of the wireless transmitter and the wireless receiver according to the eleventh embodiment.
- FIG. 39 is a block diagram showing a schematic configuration of a wireless transmitter according to an eleventh embodiment.
- FIG. 40 is a block diagram showing a schematic configuration of a wireless transmitter according to an eleventh embodiment. Explanation of symbols
- Transmitter antenna allocation detection unit Subcarrier data allocation unit Pilot signal generation unit — 1 to 226- N modulation unit — 1 to 227- N Spatial division multiplexing unit — 1 to 228— N IFFT — 1 to 229-N Frequency converter — 1 ⁇ 241— M frequency variation ⁇ Symbol timing recovery unit — 1 to 243— M FFT channel response estimation unit
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Applications Claiming Priority (4)
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JP2008546314A (ja) * | 2005-05-31 | 2008-12-18 | クゥアルコム・インコーポレイテッド | Harqを使用するmimoscw(単一符号語)設計のためのランクの段階的低下 |
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JP2008546314A (ja) * | 2005-05-31 | 2008-12-18 | クゥアルコム・インコーポレイテッド | Harqを使用するmimoscw(単一符号語)設計のためのランクの段階的低下 |
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