WO2007004490A1 - 送信装置、受信装置及び通信方法 - Google Patents
送信装置、受信装置及び通信方法 Download PDFInfo
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- WO2007004490A1 WO2007004490A1 PCT/JP2006/312916 JP2006312916W WO2007004490A1 WO 2007004490 A1 WO2007004490 A1 WO 2007004490A1 JP 2006312916 W JP2006312916 W JP 2006312916W WO 2007004490 A1 WO2007004490 A1 WO 2007004490A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
Definitions
- the present invention is used in a radio communication system using MIMO (Multiple Input Multiple Output) technology in which radio signals transmitted from a plurality of antenna elements are received by the plurality of antenna elements to perform radio communication.
- MIMO Multiple Input Multiple Output
- the present invention relates to a transmission device, a reception device, and a communication method. Background art
- SDM Space Division Multiplexing
- SDM can achieve a transmission capacity that is “number of transmit antennas” times that of SISO (Single Input Single Output) system.
- Signal separation processing on the receiving side includes spatial filtering such as Zero Forcing and MMSE (Minimum Mean Square Error), and further MLD (Maximum Likelihood Detection) processing (for example, Patent Documents). 1). When these signal separation algorithms are compared, the reception characteristics of MLD processing are the best.
- spatial filtering such as Zero Forcing and MMSE (Minimum Mean Square Error), and further MLD (Maximum Likelihood Detection) processing (for example, Patent Documents).
- Patent Document 1 Japanese Translation of Special Publication 2003-516036
- Non-patent literature 1 A. van Zelst, "bpace Division Multiplexing Algorithms, 10th Mediter ranean Electro technical Conf. (MELECON) 2000, Cyprus, May 2000, Vol. 3, pp. 12 18-1221.
- the SDM scheme has a problem that the number of signals that can be multiplexed on the transmission side depends on the number of transmission antennas, and multiplexing exceeding the number of transmission antennas cannot be performed.
- a 2 X 2 MIMO system as shown in Fig. 1 has two transmitting antennas, so two different signals X and X are multiplexed on the transmitting side, and signal separation processing is performed on the receiving side.
- the signal can be taken out.
- An object of the present invention is to provide a transmission device, a reception device, and a communication method that can improve a data rate in a MIMO system.
- the transmission apparatus of the present invention combines a plurality of transmission antennas and a first transmission signal with a second transmission signal and a third transmission signal different from the first transmission signal, respectively.
- a configuration is provided comprising: a multiplexing unit that multiplexes transmission signals with a multiplexing number equal to or greater than the number of transmission antennas; and a transmission unit that transmits the multiplexed transmission signals from the plurality of transmission antennas.
- the receiving apparatus of the present invention separates the reception signals received by the plurality of reception antennas and the plurality of reception antennas, whereby the first transmission signal and the first transmission signal are different from each other.
- Separating means for extracting a reception composite signal obtained by combining the transmission signal and the third transmission signal, respectively, and canceling out the first transmission signal, and converting the second and third transmission signals into the reception composite signal
- detecting means for recovering the canceled first transmission signal using the detected second and third transmission signals.
- FIG. 1 A diagram showing a schematic configuration of a general 2 X 2 MIMO system.
- FIG. 2 is a block diagram showing a schematic configuration of a transmission / reception system according to Embodiment 1 of the present invention.
- FIG. 3 Sequence diagram showing the communication procedure of the transmission / reception system shown in FIG.
- FIG. 4 is a block diagram showing the configuration of the base station shown in FIG.
- FIG. 5A Diagram showing signal point arrangement of composite signal X
- FIG. 6 is a block diagram showing the configuration of the mobile station shown in FIG.
- FIG. 7 is a diagram for explaining a specific example of a multiplexing number determination method in the multiplexing number determination unit shown in FIG.
- FIG. 10 is a block diagram showing the internal configuration of the multiple signal detector shown in FIG.
- FIG. 11 Flow chart showing how to determine the MLD evaluation formula in the received signal level judgment unit shown in FIG.
- a diagram showing a correspondence relationship between a received signal level determination result and maximum likelihood estimation control information [13] A block diagram showing a configuration of a base station according to Embodiment 2 of the present invention
- FIG. 15 is a diagram for explaining a specific example of a multiplexing number determining method in the multiplexing number determining unit shown in FIG.
- FIG. 17 is a block diagram showing the internal configuration of the multiple signal detector shown in FIG.
- FIG. 18 is a flowchart showing how to determine the MLD evaluation formula in the received signal level judgment unit shown in FIG.
- ⁇ 19 A diagram showing the correspondence between received signal level determination result and maximum likelihood estimation control information.
- ⁇ 20 A block diagram showing the configuration of the mobile station according to Embodiment 3 of the present invention.
- FIG. 24 is a block diagram showing the internal configuration of the multiple signal detector shown in FIG.
- FIG. 2 is a block diagram showing a schematic configuration of the transmission / reception system according to Embodiment 1 of the present invention.
- the transmission signal generation unit 101 on the transmission side combines one signal X of the three signals with the remaining two signals X and X to generate two combined signals X + x and X + x.
- the generated composite signal is transmitted from each of the transmission antennas 102 and 103.
- X is transmitted with multiple antenna forces.
- the effect of X can be offset.
- the two composite signals transmitted pass through the propagation path.
- the signals are received in a mixed state at the receiving antennas 104 and 105 on the receiving side.
- the received signals at the receiving antennas 104 and 105 are represented as r and r.
- the signal separation processing unit 106 on the reception side separates the received signals r 1 and r 2 into two signals y 1 and y by signal separation processing such as ZF (Zero Forcing).
- ZF Zero Forcing
- the cancel processing unit 108 also detects the detected X 1, X as y and y force.
- step (hereinafter abbreviated as “ST”) 111 when starting communication, a pilot signal is also transmitted to the mobile station with the base station power. At this time, information on the number of antennas indicating the number of transmission antennas of the base station (hereinafter referred to as “number of base station antennas”) is also notified to the mobile station.
- number of base station antennas information on the number of antennas indicating the number of transmission antennas of the base station
- the mobile station receives a pilot signal from the base station, and receives the received pilot signal. Is measured by the mobile station.
- the number of multiplexed signals (transmission signals) transmitted by the base station is determined by the mobile station based on the measurement result of the reception quality and the base station antenna number information. For example, when the reception quality is very good, the multiplexing number is determined so as to perform multiplexing exceeding the number of base station antennas. In other cases, the multiplexing number is determined so as to perform multiplexing below the number of base station antennas. Is done.
- MCS Modulation and Coding Scheme
- the base station receives the multiplex number control information and the MCS information from the mobile station, and a transmission signal is generated by the base station based on the multiplex number information and the MCS information.
- the multiplexing number control information indicates the multiplexing number 3 for two base station antennas
- two combined signals are obtained by combining one of the three transmission signals with the other two signals. Is generated.
- the generated composite signal is transmitted as a data signal from the base station to the mobile station together with the pilot signal.
- the mobile station receives a signal transmitted from the base station, extracts a pilot signal from the received signal, and performs channel estimation.
- the received signal is separated based on the estimated channel information.
- FIG. 4 is a block diagram showing a configuration of base station 130 shown in FIG.
- a multiplex number control unit 131 acquires multiplex number control information transmitted from a mobile station, and controls the SZP conversion unit 132 based on the acquired multiplex number control information.
- SZP conversion section 132 converts transmission data into two sequences or under the control of multiplexing number control section 131. Convert to 3 series parallel data. When converted to two series of parallel data, the two series of parallel data are output to modulation sections 133 and 135, respectively, and when converted to three series of parallel data, the three series of parallel data are modulated. Output to parts 133 to 135 respectively.
- Modulation sections 133 to 135 acquire MCS information in which the mobile station power is also transmitted, and perform modulation processing on the signal output from SZP conversion section 132 based on the acquired MCS information.
- the signal modulated by modulator 133 is output to adder 136
- the signal modulated by modulator 134 is output to adders 136 and 137
- the signal modulated by modulator 135 is output to adder 137. Is done. Note that the modulation unit 134 does not operate if no signal is output from the SZP conversion unit 132.
- adder 136 When the modulation signal is output from modulation section 134, adder 136 combines the modulation signal output from modulation section 134 and the modulation signal output from modulation section 133, and transmits the combined signal RF Output to part 138. Further, when the modulation signal is not output from modulation section 134, adder 136 outputs the signal output from modulation section 133 to transmission RF section 138.
- adder 137 When a modulation signal is output from modulation section 134, adder 137 combines the modulation signal output from modulation section 134 and the modulation signal output from modulation section 135, and transmits the combined signal RF Output to part 139. Further, adder 137 outputs the signal output from modulation section 135 to transmission RF section 139 if no modulation signal is output from modulation section 134.
- Transmission RF section 138 performs predetermined transmission processing such as up-conversion on the signal output from adder 136, and transmits the signal subjected to transmission processing from antenna 140.
- transmission RF section 139 performs predetermined transmission processing such as up-conversion on the signal output from adder 137, and transmits the signal subjected to transmission processing from antenna 141.
- Reception RF sections 142 and 143 perform predetermined reception processing such as down-conversion on signals (reception signals) received by antennas 140 and 141, and output the received signals to signal separation section 145 . Also, by performing reception processing, a pilot signal is extracted from the received signal, and the extracted pilot signal is output to channel estimation section 144.
- Channel estimation section 144 performs channel estimation based on the pilot signals output from reception RF sections 142 and 143, and outputs the estimated value to signal separation section 145 as channel estimation information.
- the signal separation unit 145 Based on the channel estimation information output from the channel estimation unit 144, the signal separation unit 145 separates the signals output from the reception RF units 142 and 143 using Zero Forcing, MMSE, and the like. These signals are output to demodulation sections 146 and 147, respectively.
- the signal output from the signal separation unit 145 is demodulated in the demodulation units 146 and 147, and the demodulated signal is converted into serial data in the PZS conversion unit 148 and output as reception data.
- the base station 130 starts communication with the mobile station, first, the pilot signal is converted into parallel data by the SZP converter 132, and the converted parallel data is modulated by the modulators 133 and 135, respectively.
- the signals are up-converted by the transmission RF units 138 and 139 and transmitted from the two antennas 140 and 141 to the mobile station.
- the base station antenna number information is also sent to the mobile station.
- the base station 130 acquires multiplex number control information and MCS information from the mobile station.
- the 2 ⁇ 2 MIMO system is assumed to have a multiplexing number of 3! /, So the multiplexing number control information acquired from the mobile station indicates the multiplexing number of 3.
- the transmission data is converted into three series of parallel data by the S / P conversion unit 132.
- the data is output to the modulation units 133 to 135, respectively.
- the modulation unit 134 operates by outputting the transmission data from the SZP conversion unit 132.
- Each modulation section 133 to 135 modulates transmission data based on the MCS information acquired by the mobile station power. Then, the modulation signal output from the modulation units 133 and 135 and the modulation signal output from the modulation unit 134 are combined in adders 136 and 137, respectively, and two combined signals X and X are generated. The two combined signals are transmitted at each transmit RF section 138, 139.
- the modulation scheme of x is QPSK
- the modulation scheme of x is QPSK
- the modulation scheme of x is BPSK
- FIG. 6 is a block diagram showing a configuration of mobile station 150 shown in FIG.
- reception RF sections 153 and 154 perform predetermined reception processing such as down-conversion on signals (reception signals) received by antennas 151 and 152, and output the received signals to signal separation section 157. Also, by performing reception processing, a pilot signal is extracted from the received signal, and the extracted pilot signal is output to channel estimation section 156 and reception quality measurement section 158.
- Channel estimation section 156 performs channel estimation based on the pilot signals output from reception RF sections 153 and 154, and outputs the estimated value to signal separation section 157 as channel estimation information.
- signal separation section 157 Based on the channel estimation information output from channel estimation section 156, signal separation section 157 separates the signals output from reception RF sections 153 and 154 using Zero Forcing, MMSE, etc. The signal is output to the multiple signal detector 161.
- Reception quality measuring section 158 measures the average value, minimum value, etc. of the received power of the pilot signals output from reception RF sections 153, 154, and provides the measurement results (hereinafter referred to as "reception quality information"). Output to the multiple determination unit 159 and the MCS selection unit 160.
- pilot reception SNR Signal to Noise Ratio
- pilot reception SIR Signal to Interference Ratio
- Pilot reception SINR Signal to Interference and noise ratio
- Multiplex number determination section 159 acquires base station antenna number information transmitted from base station 130, and based on the acquired base station antenna number information and reception quality information output from reception quality measurement section 158 Thus, the number of multiplexed signals transmitted by the base station 130 is determined.
- the received quality information is the pilot received power
- the base station antenna number information is 2.
- the multiplexing number determination unit 159 determines the multiplexing number as 3 when the received power level is equal to or higher than a certain threshold, and determines the multiplexing number as 2 when the received power level is less than the threshold.
- the received power level is equal to or higher than a threshold value and the multiplexing number 3 is determined.
- Multiplex number control information indicating the determined multiplexing number is output to the MCS selector 160 and transmitted to the base station 130.
- MCS selection section 160 is suitable for base station 130. Select the MCS table power that has the modulation method and code rate used in advance. In the following, to simplify the explanation, only the modulation method will be considered except for the coding rate.
- MCS selection section 160 selects MCS from the MCS table as shown in FIG. Therefore, when the multiplexing number is 3, the MCS table force MCS as shown in Fig. 9 is selected. As shown in Fig. 8 and Fig. 9, the number of multiplex 3 transmission bits can be set more carefully than the number of multiplex 2 transmission bits as in 7-bit transmission. In addition, the number of transmission bits that cannot be achieved with the multiplexing number 2 can be realized. In addition, the modulation level of the transmission signal can be lowered while maintaining the data rate by increasing the number of multiplexing, thereby improving the reception quality.
- MSC selection section 160 outputs an indicator corresponding to the selected MCS (modulation scheme) as MCS information to multiplexed signal detection section 161 and demodulation sections 162 to 164, and transmits it to base station 130.
- Multiplex signal detection section 161 selects an MLD evaluation formula based on the received signal level of the signal output from signal separation section 157, and selects the selected MLD evaluation formula and MCS information output from MCS selection section 160. Are used to detect the synthesized signal synthesized at the base station 130, and the signal before synthesis is acquired as a detection signal. The acquired detection signal is output to the demodulation units 162 to 164. Details of the multiple signal detector 161 will be described later.
- Demodulation sections 162 to 164 are based on MCS information output from MCS selection section 160, and Demodulate the signal output from the double signal detector 161 and output the demodulated signal to the PZS converter 165.
- the multiplexing number is 2, one of the demodulation units 162 to 164 does not operate.
- PZS conversion section 165 converts the signals output from demodulation sections 162 to 164 into serial data, and outputs the received data.
- transmission data is converted into parallel data by the SZP conversion unit 166, modulated by the modulation units 167 and 168, and predetermined by the transmission RF units 169 and 170 such as up-conversion.
- the signals are transmitted from the antennas 151 and 152 to the mobile station 150.
- FIG. 10 is a block diagram showing an internal configuration of multiplexed signal detection section 161 shown in FIG.
- the signal output from the signal separation unit 157 is defined as a reception composite signal y, y, and each reception antenna is received.
- the noise power at NA is ⁇ , n, the received composite signal y, y is the transmitted signal and noise power.
- the MLD evaluation formula in the maximum likelihood estimation processing unit 172 is determined according to the above, and maximum likelihood estimation control information indicating the determined evaluation formula is generated.
- the generated maximum likelihood estimation control information is output to the maximum likelihood estimation processing unit 172.
- FIG. 11 is a flowchart showing a method for determining an MLD evaluation formula in reception signal level determination section 171.
- ST181 it is determined whether or not the received composite signal y is greater than or equal to the noise level. If it is determined that the received composite signal y is greater than or equal to the noise level (Yes), the process proceeds to ST 182 and the noise level is increased. If it is determined that it is less than (No), the process proceeds to ST185.
- the MLD evaluation formula including X and x is determined.
- the received composite signal is determined.
- the reason why the received combined signal cannot be detected is that the two transmitted signals are combined (X + x, X + x)
- the transmission signal is the same modulation method and is synthesized in the opposite phase, even if the reception SNR is good, the signal power may drop significantly, and the reception synthesis signal may be below the noise level. Further, even when all three transmission signals are of the same modulation system, the received composite signals y and y may be below the noise level. In this case, the received composite signal is detected.
- the received signal level determination unit 171 determines that both the received composite signals y and y are noise levels.
- the maximum likelihood estimation control information indicating the MLD evaluation formula is output to the maximum likelihood estimation processing unit 172.
- Maximum likelihood estimation processing section 172 receives received composite signals y, y, MCS information, received signal level determination
- maximum likelihood estimation (MLD) processing is performed to detect a transmission signal.
- the detected signal is output to the cancel unit 173 and also output from the multiple signal detector 161.
- MLD maximum likelihood estimation
- the maximum likelihood estimation control information is 1, that is, the case where the MLD evaluation formula including X and X is determined in the received signal level determination unit 171 will be described. in this case,
- Equation (2) Since the received composite signals y and y are both above the noise level, X is eliminated from Equation (2) and X , x generates an MLD evaluation formula for x. At this time, the MLD evaluation formula can be expressed as follows.
- Maximum likelihood estimation processing section 172 identifies the modulation scheme from the MCS information, and in (x x)
- the received composite signal y Since the received signal level of the received composite signal y is lower than the noise level, the received composite signal y
- the MLD evaluation formula can be expressed as follows.
- Maximum likelihood estimation processing section 172 specifies a modulation scheme from MCS information, and in (x + x)
- the maximum likelihood estimation control information is 3, that is, a case where the MLD evaluation formula including X and X is determined in the received signal level determination unit 171 will be described.
- the received signal level of the received composite signal y is lower than the noise level, the received composite signal y
- the MLD evaluation formula can be expressed as follows.
- Maximum likelihood estimation processing section 172 identifies the modulation scheme from the MCS information, and in (x + x)
- the generated replicated power is compared with the received composite signal y, and the combination of x 'and ⁇ ' that minimizes the difference between y and ( ⁇ '+ ⁇ ')
- 1 2 2 can be used to derive X.
- Canceling section 173 detects a signal canceled by maximum likelihood estimation processing section 172 using the received composite signal and the detection signal output from maximum likelihood estimation processing section 172.
- the processing of the cancel unit 173 in the case of maximum likelihood estimation control information 1 will be described.
- Demodulation sections 162 to 164 demodulate the signal detected by multiple signal detection section 161 based on the MCS information. Received data is obtained by converting the demodulated signal into serial data in PZS conversion section 165.
- the first modulated signal and the second and third modulated signals are combined, and the two combined signals are transmitted from the two transmission antennas.
- the maximum likelihood estimation processing with the reduced number of multiplexing can be performed by canceling the first modulated signal, so that the amount of reception processing can be reduced, and the second likelihood detected by the maximum likelihood estimation processing can be reduced. Since the canceled signal can be recovered by canceling the signal using the third modulation signal, a multiplexed signal exceeding the number of transmission antennas can be demodulated. Thereby, the data rate can be improved.
- data transmission from base station 130 to mobile station 150 is assumed, but data transmission from mobile station 150 to base station 130 can be similarly performed.
- the same method is applied even to a MIMO system with a power of 3 X 3 or more, which describes the case where multiplexing of "the number of transmission antennas + 1" is realized. Can realize multiplexing of “number of transmitting antennas + 1”. For example, when transmitting four transmission signals X, X, X, and X in a 3 X 3MIM O system,
- the generation signals X 1, X 2, X are formed.
- the method for realizing the multiplexing of “the number of transmitting antennas + 1” has been described.
- FIG. 13 is a block diagram showing a configuration of base station 190 according to Embodiment 2 of the present invention.
- the multiplexing number control unit 191 acquires the multiplexing number control information transmitted from the mobile station, and controls the SZP conversion unit 132 based on the acquired multiplexing number control information.
- the multiplex number control information is 2
- the transmission data is converted into two series of parallel data.
- the multiplex number control information is 3
- the transmission data is converted into three series of parallel data.
- the multiplex number control information is 4, the transmission data is changed.
- the SZP converter 132 is controlled so that it is converted into four series of parallel data.
- the SZP conversion unit 132 converts the transmission data into any one of 2 to 4 sequences of parallel data under the control of the multiplexing number control unit 191.
- the two series of parallel data are output to modulation sections 133 and 135, respectively, and when converted to three series of parallel data, the three series of parallel data are output to the modulation section.
- the four series of parallel data are output to modulation sections 133, 135, 192, and 193, respectively.
- Modulation sections 133, 135, 192, and 193 acquire the MCS information transmitted by the mobile station, and perform modulation processing on the signal output from SZP conversion section 132 based on the acquired MCS information.
- the signal modulated by modulator 133 is output to adder 194, the signals modulated by modulators 192 and 193 are output to adders 194 and 195, respectively, and the signal modulated by modulator 135 is added. Is output to device 195.
- the modulation units 192 and 193 do not operate when no signal is output from the S / P conversion unit 132.
- the signals modulated by the modulators 133, 135, 192, and 193 are respectively represented as ⁇ 1, x 1, x 2, and x 1, the combined signals X 1 and X can be expressed as follows:
- FIG. 14 is a block diagram showing a configuration of mobile station 200 according to Embodiment 2 of the present invention.
- the multiplexing number determining unit 201 acquires the base station antenna number information transmitted from the base station 190, and the acquired base station antenna number information and the received quality information output from the received quality measuring unit 158. Based on this, the number of multiplexed signals transmitted by the base station 190 is determined.
- the received quality information is the pilot received power
- the base station antenna number information is 2.
- the multiplexing number determination unit 201 has two different thresholds, and determines the multiplexing number according to the threshold determination result of the threshold 1 and the threshold 2 lower than the threshold 1 and the received power level. Specifically, the multiplexing number is determined to be 4 when the received power level is equal to or higher than the threshold 1, and the multiplexing number is determined to be 3 when the received power level is less than the threshold 1 and threshold 2 or higher. decide.
- the received power level is equal to or higher than the threshold 1 and the multiplexing number 4 is determined in the 2 ⁇ 2 MIMO system.
- Multiplex number control information indicating the determined multiplexing number is output to the MCS selection unit 202 and transmitted to the base station 190.
- MCS selection section 202 is suitable for base station 190. Select the MCS table power that has the modulation method and code rate used in advance. In the following, to simplify the explanation, only the modulation method will be considered except for the coding rate.
- MCS selection section 202 selects MCS from the MCS table as shown in FIG. become.
- the MSC selection unit 202 outputs an indicator corresponding to the selected MCS (modulation method) as MCS information to the multiple signal detection unit 203 and the demodulation units 162 to 164, 204 and transmits it to the base station 190.
- Multiplex signal detection section 203 selects an MLD evaluation formula based on the received signal level of the signal output from signal separation section 157, and selects the selected MLD evaluation formula and MCS information output from MCS selection section 202.
- the multiplexed signal detection unit 203 performs the maximum likelihood estimation process twice.
- the acquired detection signal is output to demodulation sections 162 to 164, 204.
- FIG. 17 is a block diagram showing an internal configuration of multiplexed signal detection section 203 shown in FIG.
- the signals output from the signal separation unit 157 are defined as reception composite signals y and y, and each reception amplifier is received.
- the noise power at the tenor is ⁇ , n, the received composite signal y, y
- received signal level determining section 205 receives received levels of received composite signals y 1 and y.
- the MLD evaluation formulas in the maximum likelihood estimation processing units 206 and 208 are determined according to, and maximum likelihood estimation control information indicating the determined evaluation formulas is generated.
- the generated maximum likelihood estimation control information is output to maximum likelihood estimation processing sections 206 and 208.
- FIG. 18 is a flowchart showing a method for determining an MLD evaluation formula in received signal level determination section 205. However, parts that are the same as those in FIG. 11 are given the same reference numerals as those in FIG. 11, and detailed descriptions thereof are omitted. In Fig. 18, ST211 uses the MLD evaluation formula including X and X.
- ⁇ is included in the MLD evaluation formula.
- the received signal level determination unit 205 receives the received composite signal y, y ⁇
- the maximum likelihood estimation control information indicating the MLD evaluation formula is output to the maximum likelihood estimation processing units 206 and 208 and the cancellation unit 207.
- three signals are combined (X + x + x, X + x + x),
- Embodiment 1 Compared to Embodiment 1, there is a low possibility that the signal power will drop significantly. Therefore, when the received SNR is good, it is unlikely that the received composite signal is undetectable.
- Maximum likelihood estimation processing section 206 receives received composite signals y, y, MCS information, received signal level determination
- maximum likelihood estimation (MLD) processing is performed to detect a transmission signal.
- the detected signal is output to the cancel unit 207 and also output from the multiple signal detection unit 203.
- MLD processing corresponding to the maximum likelihood estimation control information 1 to 3 shown in FIG. 19 will be described.
- the maximum likelihood estimation control information is 1, that is, the case where the MLD evaluation formula including X and X is determined in the received signal level determination unit 205 will be described. in this case,
- Maximum likelihood estimation processing section 206 identifies the modulation scheme from the MCS information, and in (x x)
- a combination of X ′ and X ′ is a detection signal.
- MLD processing is performed using only the received composite signal y.
- the MLD evaluation formula can be expressed as follows.
- Maximum likelihood estimation processing section 206 identifies the modulation scheme from the MCS information and sets (x + x + x) to
- the combination of X, X is the detection signal.
- the MLD evaluation formula can be expressed as follows.
- Maximum likelihood estimation processing section 206 identifies the modulation scheme from the MCS information and sets (x + x + x).
- FIG. 17 shows that when the maximum likelihood estimation control information is 1, the maximum likelihood estimation processing unit 206 detects two signals. In this case, the maximum likelihood estimation processing unit 206 detects three signals, and the maximum likelihood estimation processing unit 208 does not detect signals.
- any of the above-described maximum likelihood estimation control information 13 when the received composite signal in the MLD evaluation formula is the same modulation method, the detection error of the transmission signal is caused by the combination of signal point arrangements overlapping. Although this may occur, this possibility can be reduced by applying power control and phase rotation on the transmitting side.
- Canceling section 207 detects a signal canceled by maximum likelihood estimation processing section 206 using the received composite signal and the detection signal output from maximum likelihood estimation processing section 206. However, the cancel cell unit 207 does not operate when the maximum likelihood estimation control information output from the received signal level determination unit 205 is other than 1.
- the processing of the cancel unit 207 in the case of maximum likelihood estimation control information 1 will be described.
- the detected combined signal is output to maximum likelihood estimation processing section 208 with gain obtained as described below.
- the maximum likelihood estimation processing unit 208 is based on the combined signal, MCS information, and the maximum likelihood estimation control information output from the received signal level determination unit 205 indicated by the above equation (15) output from the cancellation unit 207. Maximum likelihood estimation processing is performed to detect a transmission signal. At this time, the MLD evaluation formula can be expressed as follows. However, the maximum likelihood estimation processing unit 208 does not operate when the maximum likelihood estimation control information is other than 1, like the cancellation unit 207.
- Maximum likelihood estimation processing section 208 calculates X and x modulation methods from MCS information as shown in equation (16). Identify the formula and use replica ( ⁇ '+ for all combinations of constellation in (X + X)
- a combination of X 'and X' is detected signal.
- the maximum likelihood estimation processing unit 208 may cause a detection error of a transmission signal due to the combination of signal point arrangements. However, power control is performed on the transmission side. This possibility can be reduced by applying or phase rotation.
- a signal multiplexed by “the number of transmission antennas + 2” or more is performed on the reception side by performing maximum likelihood estimation processing and cancellation processing according to the number of multiplexing. Therefore, the data rate can be further improved. Also, by synthesizing more signals, it is possible to avoid a significant drop in signal level on the receiving side and improve reception characteristics.
- data transmission from mobile station 200 to base station 190 can be performed in the same manner assuming data transmission from base station 190 to mobile station 200.
- FIG. 20 is a block diagram showing a configuration of mobile station 220 according to Embodiment 3 of the present invention.
- combined signal determination sections 221 and 222 determine the signal point of the received combined signal output from signal separation section 157 based on the MCS information output from MCS selection section 160.
- the detection accuracy in the multiple signal detection unit 161 may be affected. Therefore, it is possible to improve the detection accuracy in the multiplex signal detector 161 by determining the signal point of the received combined signal and specifying the combination of signals.
- the received combined signals y 1 and y separated in the signal separation unit 157 can be expressed by the above equation (2).
- the X modulation method is QPSK
- the X modulation method is QPSK
- the X modulation method is BPSK
- the received composite signal output from the signal separation unit 157 is the force observed at a position where the signal point of the original composite signal is also separated due to the effects of noise and interference (circle shown as spread due to noise in the figure). By discriminating such received composite signals using decision boundaries, the force that was the signal point is identified. The identified received composite signal is output to the multiple signal detector 161.
- the signal point of the combined signal is determined even when the received SNR of the combined signal is low, or even when the signal separation is incomplete and the interference component remains.
- the combined signal from which noise and interference have been removed can be identified, so that the detection accuracy of the transmission signal in the maximum likelihood estimation process can be improved and the reception quality can be improved.
- FIG. 22 is a block diagram showing a configuration of base station 230 according to Embodiment 4 of the present invention.
- Transmit beamforming section 231 acquires channel estimation information transmitted (feedback) from the mobile station, generates a transmission weight based on the acquired channel estimation information, and multiplies the synthesized signal by the generated transmission weight.
- the transmission weight matrix W is obtained by eigenvalue decomposition of the correlation matrix H H H of the channel estimation information H.
- the eigenvalue decomposition is shown below.
- H H H EDE H ⁇ ⁇ -(1 8)
- H Hermitian conjugate.
- E is a matrix that also has eigenvector forces
- D is a diagonal matrix that also has eigenvalues and ⁇ forces
- D diag [, ⁇ ].
- the transmission weight matrix W E.
- the combined signal X,, X, weight multiplied by the signal beamforming unit 231 is
- FIG. 23 is a block diagram showing a configuration of mobile station 240 according to Embodiment 4 of the present invention.
- a channel estimation unit 156 performs channel estimation based on the pilot signals output from the reception RF units 153 and 154, and outputs the estimated value to the reception beamforming unit 241 as channel estimation information. Also, it is transmitted to the base station 230.
- Reception beamforming section 241 generates reception weights based on the channel estimation information output from channel estimation section 156, and uses the generated reception weights to receive reception outputs from reception RF sections 153 and 154. Separate the signal.
- reception beam forming section 241 calculation processing in reception beam forming section 241 will be described.
- the eigenvalue decomposition is performed on the correlation matrix H H H of the channel estimation information H to obtain a vertical matrix E composed of eigenvectors.
- the reception weight matrix V can be expressed as follows using the channel estimation information H and the binary matrix E.
- V (HEf (2 0)
- Reception beam forming section 241 multiplies the reception signal by reception weight matrix V obtained by the above equation (20), thereby separating the signal and detecting the reception composite signal.
- the received signal at each antenna is r, r, each element of the received weight matrix V is v to v,
- FIG. 24 is a block diagram showing an internal configuration of multiplexed signal detection section 242 shown in FIG.
- the maximum likelihood estimation processing unit 243 receives received composite signals y and y, eigenvalue information, MCS
- a maximum likelihood estimation process is performed to detect a transmission signal.
- the maximum likelihood estimation control information is the same as shown in FIG.
- the detected signal is output to the cancel unit 244 and output from the multiple signal detection unit 242.
- the MLD process corresponding to the maximum likelihood estimation control information 1 to 3 shown in FIG. 12 will be described.
- the MLD evaluation formula can be expressed as follows.
- Maximum likelihood estimation processing section 243 identifies the modulation scheme from the MCS information, and in (X -X)
- the received signal level of the received combined signal y is the noise level.
- MLD processing is performed using only the received composite signal y.
- the MLD evaluation formula can be expressed as follows.
- Maximum likelihood estimation processing section 243 identifies the modulation scheme from the MCS information, and uses ( ⁇ + ⁇ )
- the evaluation formula can be expressed as follows.
- Cancellation section 244 detects the signal canceled by maximum likelihood estimation processing section 243 using the received combined signal and the detection signal output from maximum likelihood estimation processing section 243.
- the processing of the cancellation unit 244 in the case of maximum likelihood estimation control information 1 will be described.
- Equation (21) X can be expressed as follows.
- (+) 3 ⁇ 4 2 (t + 2 ) — () + 3 ) ⁇ '(2 6)
- the fourth embodiment by performing transmission / reception beam forming, the combined signal is apparently received without any interference, so that the detection accuracy of the transmission signal in the maximum likelihood estimation process is improved.
- the signal canceled in the maximum likelihood estimation process can be detected by further improving the gain of the signal, the reception quality can be improved.
- the transmission apparatus, reception apparatus, and communication method according to the present invention are not limited to the above-described embodiments, and can be implemented with various modifications. For example, each embodiment can be implemented in combination as appropriate.
- the transmission device and the reception device according to the present invention can be mounted on a communication terminal device and a base station device in a mobile communication system, and thereby a communication terminal device having the same effects as described above, A base station apparatus and a mobile communication system can be provided.
- the present invention can be implemented with software. For example, by describing the algorithm of the communication method according to the present invention in a programming language, storing the program in a memory, and causing the information processing means to execute the function, the same functions as those of the transmission device and the reception device according to the present invention Can be realized.
- Each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include some or all of them.
- IC system LSI
- SI system LSI
- Unorare LSI etc.
- the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general-purpose processors is also possible. It is also possible to use a field programmable gate array (FPGA) that can be programmed after LSI manufacturing, or a reconfigurable processor that can reconfigure the connection or setting of circuit cells inside the LSI.
- FPGA field programmable gate array
- the transmission device, reception device, and communication method according to the present invention have the effect of improving the data rate in a system, and can be applied to communication terminal devices, base station devices, and the like.
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Abstract
Description
Claims
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JP2007523981A JPWO2007004490A1 (ja) | 2005-06-30 | 2006-06-28 | 送信装置、受信装置及び通信方法 |
EP06767533A EP1898545A1 (en) | 2005-06-30 | 2006-06-28 | Transmitter, receiver, and communication method |
US11/994,112 US20090116571A1 (en) | 2005-06-30 | 2006-06-28 | Transmitter, receiver, and communication method |
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EP (1) | EP1898545A1 (ja) |
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CN101213778A (zh) | 2008-07-02 |
US20090116571A1 (en) | 2009-05-07 |
JPWO2007004490A1 (ja) | 2009-01-29 |
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