WO2011035728A1 - 协作中继系统中预编码方法、通信装置和中继装置 - Google Patents

协作中继系统中预编码方法、通信装置和中继装置 Download PDF

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Publication number
WO2011035728A1
WO2011035728A1 PCT/CN2010/077324 CN2010077324W WO2011035728A1 WO 2011035728 A1 WO2011035728 A1 WO 2011035728A1 CN 2010077324 W CN2010077324 W CN 2010077324W WO 2011035728 A1 WO2011035728 A1 WO 2011035728A1
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precoding matrix
precoding
local
relay
optimal
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PCT/CN2010/077324
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English (en)
French (fr)
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龚政委
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华为技术有限公司
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Priority to EP10818422.7A priority Critical patent/EP2485423B1/en
Publication of WO2011035728A1 publication Critical patent/WO2011035728A1/zh
Priority to US13/430,873 priority patent/US8861392B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/026—Co-operative diversity, e.g. using fixed or mobile stations as relays
    • 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
    • H04B7/0426—Power distribution
    • H04B7/043—Power distribution using best eigenmode, e.g. beam forming or beam steering
    • 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
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0634—Antenna weights or vector/matrix coefficients
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • 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
    • H04B7/0697—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 spatial multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0097—Relays

Definitions

  • Pre-coding method, communication device and relay device in cooperative relay system The application is submitted to the Chinese Patent Office on September 28, 2009, and the application number is 200910177267. 7.
  • the invention name is "pre-coding method in cooperative relay system, The priority of the Chinese Patent Application for the communication device and the relay device is incorporated herein by reference.
  • the present invention relates to the field of wireless communication technologies, and in particular, to a precoding method, a communication device, and a relay device in a cooperative relay system. Background technique
  • a cooperative relay technology is introduced.
  • one or more relay stations are arranged between the transmitting end and the receiving end.
  • each relay station cooperates with each other when transmitting data packets in parallel, and can simultaneously broadcast to multiple relay stations by using the wireless channel.
  • the characteristics, and by enabling these relay stations to cooperate reduce the power consumption when transmitting packets from the transmitting end to the receiving end, and can also significantly increase the gain of both total throughput and power efficiency.
  • the transmitting end needs to perform precoding.
  • the multi-user precoding scheme for point-to-multipoint is:
  • the transmitting end transmits multiple different data packets simultaneously through multiple antenna channels to a plurality of different receiving ends.
  • the precoding of the transmitting end causes different data packets to be transmitted in parallel on the respective single link channels.
  • the precoding information of the transmitting end is calculated by the channel information of the transmitting end known to the transmitting end to all receiving ends, and can also be obtained by feedback calculation of all receiving ends.
  • the output signals of different receivers can be expressed as: Wherein, H l and H 2 are single-link channel information from the transmitting end to different receiving ends, respectively, Pi and P 2 are optimal precoding information corresponding to different receiving ends, and are additive noise vectors on different receiving ends, The content in parentheses is The interference signal received at the receiving end.
  • the transmitting end transmits multiple different data packets simultaneously to multiple different receiving ends through multiple antenna channels.
  • the transmitting end needs to transmit the same data to multiple different receiving ends at the same time. If the transmitting end still uses the above method for precoding, each receiving end will not be able to obtain similar good transmission performance. Summary of the invention
  • Embodiments of the present invention provide a precoding method, a communication device, and a relay device in a cooperative relay system, and a transmitting end can simultaneously transmit the same information to different relay stations with similar good transmission performance.
  • a precoding method in a cooperative relay system comprising:
  • a precoding method in a cooperative relay system comprising:
  • the precoding matrix of the integrated optimal subchannel is determined by a precoding matrix of the local best subchannel of the transmitting end to each relay station.
  • a communication device comprising:
  • a first acquiring module configured to acquire a precoding matrix of the local optimal subchannel of the communication device to each relay station
  • a second acquiring module configured to obtain a precoding matrix of the integrated optimal subchannel according to the precoding matrix of each local optimal subchannel.
  • a relay device includes:
  • a receiving module configured to receive, by the transmitting end, data of the precoding matrix code of the integrated optimal subchannel, where the precoding matrix of the integrated optimal subchannel passes the local optimum of the transmitting end to each relay device The precoding matrix of the channel is determined.
  • the transmitting end is capable of acquiring the precoding matrix of the integrated optimal subchannel according to the precoding matrix of the local optimal subchannel to each relay station, and Data encoded by the precoding matrix of the integrated optimal subchannel is transmitted to each relay station.
  • the transmitting end can simultaneously transmit the data encoded by the precoding matrix of the integrated optimal subchannel to the different relay stations through the integrated optimal subchannel, thereby improving the first hop to multipoint in the cooperative relay system.
  • the transmission performance makes the performance of each relay station similar and optimal, ensures the coordinated transmission performance of the second hop, and realizes the optimal pre-processing of the transmitting end.
  • FIG. 1 is a block diagram of data transmission in point-to-multipoint in the prior art
  • FIG. 2 is a flowchart of a precoding method in a cooperative relay system according to an embodiment of the present invention
  • FIG. 3 is a block diagram of a first hop-to-multipoint data transmission in a cooperative relay system according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a precoding method in a cooperative relay system according to an embodiment of the present invention
  • FIG. 5, FIG. 6, FIG. 7, and FIG. 8 are flowcharts of a method for precoding in a cooperative relay system according to an embodiment of the present invention
  • FIG. 5a, FIG. 6a, FIG. 7a, and FIG. 8a are cooperative relays according to an embodiment of the present invention
  • Schematic diagram of the precoding method in the system
  • FIG. 9 is a schematic structural diagram of a communication apparatus according to an embodiment of the present invention.
  • FIG. 10 and FIG. 11 are schematic structural diagrams of a communication apparatus according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of a relay device according to an embodiment of the present invention. Specific lung
  • an embodiment of the present invention provides a precoding method in a cooperative relay system.
  • FIG. 3 it is a block diagram of a first hop-to-multipoint data transmission in a cooperative relay system according to an embodiment of the present invention.
  • the cooperative relay system There are a plurality of different relay stations in the system, and the transmitting end sends the same multi-stream information a to a plurality of different relay stations, and the transmitting end may be a base station or a user terminal; the multi-stream information S fi Sl and S2, S 1 And S2 are sent on different antennas respectively.
  • the transmitting end designs a corresponding precoding matrix p, and the transmitted signal vector 8 is precoded and sent to a plurality of different relay stations.
  • the precoding method in the cooperative relay system includes:
  • a single link is formed between the transmitting end and each of the relay stations, each single link includes multiple subchannels, and the local optimal subchannel is a single or multiple of multiple subchannels of a single link;
  • precoding is to map data onto an optimal single or multiple subchannels of a multi-antenna channel. Therefore, the precoding matrix of the local optimal subchannel can ensure that the data is different at the transmitting end.
  • the transmission is performed on the local optimal subchannel of the single link of the relay station; to ensure that the transmission performance on each relay station is similar and optimal, it is necessary to ensure the integrated optimal subchannel composed of the local optimal subchannel of each single link. Up-conversion, so it is necessary to obtain a pre-coding matrix of the integrated optimal subchannel.
  • the transmitting end can obtain the precoding matrix of the integrated optimal subchannel according to the precoding matrix of the local optimal subchannel of the transmitting end to each relay station.
  • the transmitting end can simultaneously transmit the data encoded by the precoding matrix of the integrated optimal subchannel to the different relay stations through the integrated optimal subchannel, thereby improving the number of the cooperative relay system.
  • the hop-to-multipoint transmission performance makes the performance of each relay station similar and optimal, ensuring the coordinated transmission performance of the second hop, and achieving optimal pre-processing at the transmitting end.
  • an embodiment of the present invention provides a precoding method in a cooperative relay system.
  • the precoding method in the cooperative relay system includes:
  • the relay station can receive the data encoded by the precoding matrix of the integrated optimal subchannel transmitted by the transmitting end, and the precoding matrix of the integrated optimal subchannel passes the transmitting end Precoding matrix determination to the local best subchannel of each relay station.
  • Different relay stations can compare with the prior art
  • the first hop-to-multipoint transmission performance in the cooperative relay system is improved by simultaneously receiving the data encoded by the precoding matrix of the integrated optimal subchannel transmitted by the transmitting end by using the integrated optimal subchannel.
  • the performance of each relay station is similar and optimal, ensuring the coordinated transmission performance of the second hop, and realizing that different relay stations receive data with similar good transmission performance.
  • an embodiment of the present invention provides a precoding method in a cooperative relay system.
  • the cooperative relay system has two relay stations RS1 and RS2, and the transmitting end respectively receives the single-link channel information ⁇ and H2 sent by the relay stations RS1 and RS2, and integrates the pre-optimal subchannel pre-
  • the coding matrix P is transmitted to the relay stations RS1 and RS2, respectively.
  • the transmitting end transmits the same multi-stream information S to two different relay stations RS1 and RS2, which may be a base station or a user terminal.
  • the number of antennas at the transmitting end is 4, the number of receiving antennas of the two relay stations RS1 and RS2 is 2, the number of information streams sent from the transmitting end to each relay station is 2, and the multi-stream information S is composed of S1 and S2.
  • S1 and S2 are transmitted on different antennas, respectively.
  • the transmitting end designs a corresponding precoding matrix P, and after transmitting the plurality of information streams S to the relay stations RS1 and RS2, the output signals of the relay stations RS1 and RS2 are as shown in the formula (1):
  • ⁇ ⁇ is the single-link channel information from the transmitting end to the relay station RS1
  • ⁇ is the additive noise vector on the relay station RS1
  • 112 is the additive on the relay station RS2 Noise vector.
  • the precoding method in the cooperative relay system includes:
  • the relay station RS1 receives transmitter transmitting end transmits to the relay station RS1 is single-link channel information ⁇ ⁇ , and the transmitter transmits to the relay station RS2 to the relay station RS2 single link channel information ⁇ 2.
  • the transmitting end performs SVD (Singular Value Decomposition) operation on the single-link channel information ⁇ ⁇ and ⁇ 2: Where U i, V i and U 2, V 2 are 4 4 4th order ⁇ matrices, ⁇ 1 and ⁇ 2 are diagonal matrices, ( ⁇ is a conjugate transpose (Ermite) operation of matrix X, Wherein X can be V i or V 2 ;
  • SVD Single Value Decomposition
  • the transmitting end acquires a precoding matrix of each local optimal subchannel.
  • the transmitting end obtains a precoding matrix ⁇ of the integrated optimal subchannel according to the SVD operation result, as shown in the formula (5):
  • the transmitting end sends the data encoded by the precoding matrix P of the integrated optimal subchannel to the relay station.
  • the transmitting end may further feed back the pre-coded information used by the transmitting end to the relay station. Therefore, the embodiment of the present invention may further include:
  • the bearer feeds the precoding matrix P of the integrated optimal subchannel to the relay stations RS1 and RS2 respectively under the bearer of the DRS (Dediated Reference Pilot).
  • the relay stations RS I and RS2 respectively perform correct decoding of the received data according to the precoding matrix P of the integrated optimal subchannel.
  • the transmitting end can obtain the precoding matrix of the integrated optimal subchannel according to the precoding matrix of the local optimal subchannel of the transmitting end to each relay station, and The data of the precoding matrix code of the optimal subchannel is sent to each relay station, which improves the transmission performance of the first hop to the multipoint in the cooperative relay system, so that the performance of each relay station is similar and optimal, and the second hop is ensured.
  • the optimal pre-processing of the transmitting end is implemented.
  • the transmitting end can feed back the precoding matrix of the integrated optimal subchannel to each relay station, so that each relay station can correctly decode and ensure the correct data in the cooperative relay system. Sending and receiving, reducing the feedback overhead of the system.
  • an embodiment of the present invention provides a precoding method in a cooperative relay system.
  • the cooperative relay system has two relay stations RS1 and RS2, and the transmitting end receives a local PMI (Pre-coding Matrix Indication) value sent by the relay stations RS1 and RS2, respectively.
  • the port "Lz" transmits the precoding matrix P of the integrated optimal subchannel to the relay stations RS1 and RS2, respectively.
  • the precoding method in the cooperative relay system includes:
  • the transmitting end receives the PMI value " ⁇ of the relay station RS1 and the PMI value sent by the relay station RS2".
  • the transmitting end acquires, according to the PMI values “1 and “M, based on the codebook C agreed with the relay station, the precoding matrices ⁇ ⁇ and A of the local optimal subchannels:
  • the transmitting end and the relay station set a codebook c in advance before the communication, the codebook
  • C contains several precoding code words.
  • Codebook based precoding can effectively reduce the feedback overhead of the channel.
  • the relay station Before transmitting information on the transmitting end, the relay station selects a pre-coded code word that is considered to be the best from the codebook c according to the current channel characteristics (in this case, if the transmitting end uses the codeword to perform pre-coding, the receiving, receiving The end will have the best performance), and the index corresponding to the codeword in the codebook is fed back to the sender.
  • the transmitting end further pre-codes the transmitted signal by selecting a codeword opposite to the index from the codebook according to the feedback information. That is to say, in codebook-based precoding, the form of the feedback information is an index corresponding to the codeword.
  • the transmitting end further precoding information used by the transmitting end may be fed back to the relay station, specifically with reference to steps 503-506, which is not Let me repeat.
  • the transmitting end can obtain the precoding matrix of the integrated optimal subchannel according to the precoding matrix of the local optimal subchannel of the transmitting end to each relay station, and The data of the precoding matrix code of the optimal subchannel is sent to each relay station, which improves the transmission performance of the first hop to the multipoint in the cooperative relay system, so that the performance of each relay station is similar and optimal, and the second hop is ensured.
  • the optimal pre-processing of the transmitting end is implemented.
  • the transmitting end can feed back the precoding matrix of the integrated optimal subchannel to each relay station, so that each relay station can correctly decode and ensure the correct data in the cooperative relay system. Sending and receiving, reducing the feedback overhead of the system.
  • an embodiment of the present invention provides a precoding method in a cooperative relay system.
  • FIG. 7a there are two relay stations RS1 and RS2 in the cooperative relay system, and the transmitting end respectively receives the local PMI values "1" and " ⁇ " transmitted by the relay stations RS1 and RS2, and integrates the optimal subchannels.
  • the optimal PMI value corresponding to the precoding matrix P is transmitted to the relay stations RS 1 and RS2.
  • the precoding method in the cooperative relay system includes:
  • the precoding matrix of each local optimal subchannel is determined by the PMI value sent by the relay station.
  • the precoding matrix P of the integrated optimal subchannel is obtained according to the obtained ⁇ .
  • the transmitting end may feed back the precoding information used by the transmitting end to the relay station, so that the relay station can implement the correct decoding. Therefore, the embodiment of the present invention may further include:
  • the transmitting end acquires an optimal PMI value corresponding to the precoding matrix P of the integrated optimal subchannel according to the precoding matrix P of the integrated optimal subchannel and the codebook C agreed with the relay station. :
  • the transmitting end sends the best PMI value "p" to the relay stations RS1 and RS2.
  • the relay stations RS1 and RS2 obtain the precoding matrix P of the integrated optimal subchannel according to the best PMI value ⁇ and the codebook C agreed with the transmitting end, respectively.
  • the relay stations RS I and RS2 respectively implement correct decoding of the received data according to the precoding matrix P of the integrated optimal subchannel.
  • the transmitting end can obtain the precoding matrix of the integrated optimal subchannel according to the precoding matrix of the local optimal subchannel of the transmitting end to each relay station, and The data of the precoding matrix code of the optimal subchannel is sent to each relay station, which improves the transmission performance of the first hop to the multipoint in the cooperative relay system, so that the performance of each relay station is similar and optimal, and the second hop is ensured.
  • the cooperative transmission performance realizes the optimal pre-processing of the transmitting end; in addition, the transmitting end can send the optimal PMI value to each relay station, and each relay station acquires the precoding matrix of the integrated optimal subchannel according to the optimal PMI value. To achieve correct decoding, indeed The correct transmission and reception of data in the cooperative relay system is guaranteed, and the feedback overhead of the system is reduced.
  • an embodiment of the present invention provides a precoding method in a cooperative relay system.
  • FIG. 8a there are two relay stations RS 1 and RS2 in the cooperative relay system, and the transmitting end respectively receives the local PMI values n and N F L M sent by the relay stations RS 1 and RS2, and mixes the PMI value n direction.
  • the relay stations RS 1 and RS2 transmit.
  • the precoding method in the cooperative relay system includes:
  • steps 601-602 determining a precoding matrix of each local optimal subchannel by using a PMI value sent by the relay station.
  • steps 503-504 refer to steps 503-504, and obtain a precoding matrix P of the integrated optimal subchannel according to the obtained sum.
  • the transmitting end may feed back the precoding information used by the transmitting end to the relay station, so that the relay station can implement the correct decoding. Therefore, the embodiment of the present invention may further include:
  • the transmitting end acquires a mixed ⁇ value ⁇ according to the PMI values AM and N P M ;
  • the transmitting end sends the hybrid threshold " ⁇ ?" to the relay stations RS1 and RS2.
  • the relay station RS 1 and RS2 are known ⁇ value of the respective local precoding corresponding to and therefore, the relay station RS 1 and RS2 ⁇ values by respective local precoding corresponding " ⁇ 7 and N M mixed with a PMI value n Perform a logical operation to obtain the PMI values M and / corresponding to the local precoding of the adjacent relay station:
  • the PMI value corresponding to the local precoding of the relay station RS I neighboring relay station "the PMI value corresponding to the local precoding of the relay station RS2 neighboring relay station;
  • the relay station RS 1 and RS2 respectively acquire respective local precoding matrix and local neighboring relay station and a precoding matrix ⁇ ⁇
  • the relay stations RS 1 and RS2 perform SVD operations on ⁇ and respectively, according to the SVD As a result of the operation, the relay stations RSI and RS2 acquire the precoding matrix P of the integrated optimal subchannel.
  • the relay stations RS1 and RS2 respectively implement correct decoding of the received data according to the precoding matrix P of the integrated optimal subchannel.
  • the relay system includes two relay stations as an example, but the method of the embodiment of the present invention is not limited to the relay system, which only includes two relay stations, and can be applied to more than two relay stations. Following the system.
  • the transmitting end can obtain the precoding matrix of the integrated optimal subchannel according to the precoding matrix of the local optimal subchannel of the transmitting end to each relay station, and The data of the precoding matrix code of the optimal subchannel is sent to each relay station, which improves the transmission performance of the first hop to the multipoint in the cooperative relay system, so that the performance of each relay station is similar and optimal, and the second hop is ensured.
  • the coordinated transmission performance realizes the optimal pre-processing of the transmitting end; in addition, the transmitting end can send the mixed PMI value to each relay station, and each relay station acquires the precoding matrix of the integrated optimal subchannel according to the mixed PMI value, thereby Achieve correct decoding, ensure the correct transmission and reception of data in the cooperative relay system, and reduce the feedback overhead of the system.
  • an embodiment of the present invention provides a communication device, where the communication device includes:
  • a first obtaining module 91 configured to acquire a precoding matrix of the local optimal subchannel of the communication device to each relay station;
  • the second obtaining module 92 is configured to obtain a precoding matrix of the integrated optimal subchannel according to the precoding matrix of each local optimal subchannel acquired by the first acquiring module 91.
  • the communication device is capable of acquiring a precoding matrix of the integrated optimal subchannel according to a precoding matrix of a local optimal subchannel to each relay station.
  • the communication device can simultaneously transmit data encoded by the precoding matrix of the integrated optimal subchannel to different relay stations through the integrated optimal subchannel, thereby improving the cooperative relay system.
  • the first hop-to-multipoint transmission performance makes the performance of each relay station similar and optimal, and ensures the coordinated transmission performance of the second hop, realizing the optimal pre-processing of the communication device.
  • an embodiment of the present invention provides a communication device, where the communication device includes: a first acquiring module 91, configured to acquire a pre-local optimal subchannel of the communication device to each relay station. Coding matrix
  • the second obtaining module 92 is configured to obtain a precoding matrix of the integrated optimal subchannel according to the precoding matrix of each local optimal subchannel acquired by the first acquiring module 91.
  • the first obtaining module 91 may include:
  • a first receiving unit 911 configured to receive a single link message sent by each relay station to each relay station Road information
  • the first obtaining unit 912 is configured to perform an SVD operation on each single-link channel information received by the first receiving unit 911, and obtain a precoding matrix of each local optimal subchannel according to the SVD operation result.
  • the second obtaining module 92 may include:
  • the second obtaining unit 921 is configured to perform an SVD operation on the pre-coding matrix of each local optimal subchannel acquired by the first acquiring unit 912, and obtain a precoding matrix of the integrated optimal subchannel according to the SVD operation result.
  • the first obtaining module 91 may further include:
  • a second receiving unit 913 configured to receive an indication value of a precoding matrix sent by each relay station
  • the third obtaining unit 914 is configured to acquire, according to the indication value of the precoding matrix received by the second receiving unit 913, a precoding matrix of each local optimal subchannel based on a codebook agreed by the communication device and the relay station.
  • the second obtaining module 92 may further include:
  • the fourth obtaining unit 922 is configured to perform a singular value decomposition operation on the precoding matrix of each local optimal subchannel acquired by the third acquiring unit 914, and obtain an integrated optimal subchannel according to the singular value decomposition operation result. Precoding matrix.
  • the communication device may further include:
  • the feedback module 93 is configured to feed back the precoding matrix of the integrated optimal subchannel to the relay stations by demodulating dedicated pilots.
  • the communication device may further include:
  • the third obtaining module 94 is configured to obtain, according to the fourth acquiring unit, the precoding matrix of the integrated optimal subchannel of the 922, and the codebook agreed with the relay station, to obtain an indication value of the optimal precoding matrix;
  • the sending module 95 is configured to send the indication value of the optimal precoding matrix to each relay station.
  • the third obtaining module 94 is further configured to obtain an indication value of the hybrid precoding matrix according to the indication value of the precoding matrix received by the second receiving unit 913;
  • the sending module 95 is further configured to send the indication value of the hybrid precoding matrix to each relay station.
  • the communication device is capable of acquiring a precoding matrix of the integrated optimal subchannel according to a precoding matrix of a local optimal subchannel to each relay station, so that the communication device can pass the synthesis
  • the precoding matrix encoded data of the optimal subchannel is simultaneously transmitted to different relay stations through the integrated optimal subchannel, thereby improving the transmission performance of the first hop to the multipoint in the cooperative relay system, so that the performance of each relay station Similar to, and optimal, ensuring coordinated transmission performance of the second hop, implementing optimal pre-processing of the communication device; further, the communication device can feed back the pre-coding matrix of the integrated optimal subchannel to each Relay station, or, will be the best PMI
  • the value or mixed PMI value is sent to each relay station, and each relay station acquires the precoding matrix of the integrated optimal subchannel according to the optimal PMI value or the mixed PMI value, so that each relay station can achieve correct decoding, thereby ensuring cooperation. Following the correct sending and receiving of data in the system, the feedback overhead of the system is reduced.
  • an embodiment of the present invention provides a relay device, where the relay device includes: a receiving module 121, configured to receive data encoded by a precoding matrix of an integrated optimal subchannel transmitted by a transmitting end;
  • the precoding matrix of the integrated optimal subchannel is determined by a precoding matrix of the local optimum subchannel of the transmitting end to each relay device.
  • the relay device can receive the data encoded by the precoding matrix of the integrated optimal subchannel transmitted by the transmitting end, and the precoding matrix of the integrated optimal subchannel passes through the transmitting end to A precoding matrix determination of a local optimum subchannel of each relay device.
  • different relay devices can simultaneously receive data encoded by the precoding matrix of the integrated optimal subchannel transmitted by the transmitting end by using the integrated optimal subchannel, thereby improving cooperative relaying.
  • the first hop-to-multipoint transmission performance in the system makes the performance of each relay device similar and optimal, ensures the coordinated transmission performance of the second hop, and realizes that different relay devices receive data with similar good transmission performance. .
  • the relay device may further include:
  • the receiving module 121 is configured to receive data encoded by the precoding matrix of the integrated optimal subchannel sent by the transmitting end;
  • the precoding matrix of the integrated optimal subchannel is determined by a precoding matrix of the local optimum subchannel of the transmitting end to each relay device.
  • the receiving module 121 is further configured to receive a precoding matrix of the integrated optimal subchannel that is sent by the transmitting end by demodulating a dedicated pilot.
  • the receiving module 121 is further configured to receive an indication value of an optimal precoding matrix sent by the transmitting end, where the relay device further includes a first acquiring module 122, configured to use the indication according to the optimal precoding matrix. And a codebook agreed with the transmitting end to obtain a precoding matrix of the integrated optimal subchannel.
  • the receiving module 121 is further configured to receive an indication value of the hybrid precoding matrix sent by the transmitting end, where the relay device further includes a second acquiring module 123, configured to precode the precoding matrix corresponding to the local precoding Performing a logical operation on the indication value of the hybrid precoding matrix to obtain an indication value of a precoding matrix of the neighboring relay device; and indicating the value of the precoding matrix corresponding to the local precoding and the adjacent relay device Determining an indication value of the precoding matrix corresponding to the local precoding, and acquiring a local precoding matrix and a local precoding matrix of the neighboring relay device; The local precoding matrix and the local precoding matrix of the neighboring relay device perform a singular value decomposition operation, and obtain a precoding matrix of the integrated optimal subchannel according to the singular value decomposition operation result.
  • the relay device can receive the data encoded by the precoding matrix of the integrated optimal subchannel transmitted by the transmitting end, and the precoding matrix of the integrated optimal subchannel passes through the transmitting end to The precoding matrix of the local optimal subchannel of each relay device is determined, thereby improving the transmission performance of the first hop to the multipoint in the cooperative relay system, so that the performance of each relay device is similar and optimal, ensuring The cooperative transmission performance of the second hop enables different relay devices to receive data with similar good transmission performance; further, the relay device can receive the precoding matrix of the integrated optimal subchannel fed back by the transmitting end, or Receiving an optimal PMI value or a mixed PMI value sent by the transmitting end, acquiring a precoding matrix of the integrated optimal subchannel according to the optimal PMI value or the mixed PMI value, thereby implementing correct decoding, and ensuring a cooperative relay system The correct transmission and reception of the data in the system reduces the feedback overhead of the system.
  • the communication device and the relay device provided by the embodiments of the present invention may implement the method embodiments provided above.
  • the method, the communication device and the relay device provided by the embodiments of the present invention can be applied to the precoding between the transmitting end and the relay station in the cooperative relay system, but are not limited thereto.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Description

协作中继系统中预编码方法、 通信装置和中继装置 本申请要求于 2009年 9月 28日提交中国专利局、 申请号为 200910177267. 7、发明 名称为 "协作中继系统中预编码方法、通信装置和中继装置"的中国专利申请的优先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及无线通信技术领域， 特别涉及一种协作中继系统中预编码方法、 通信装 置和中继装置。 背景技术
随着无线通信业务的飞速发展， 未来网络需要以最低成本的布局设计来支持盲点地 区或热点地区的通信， 提供更好的覆盖或系统吞吐率， 为此引入了中继技术。 在常规中 继网络中，数据包经由单个路径并可能通过中继站以多个连续跳跃从发射端发送到接收
W o
而为了在更大的覆盖范围内提供更高的数据传输速率， 引入了协作中继技术。 在协 作中继网络中， 发射端和接收端之间布设有一个或多个中继站， 在数据传输过程中， 各 中继站在并行发送数据包时彼此协作，利用无线信道能够同时到达多个中继站的广播特 性，并通过使这些中继站能够协作，从而减少将数据包从发射端传送到接收端时的功耗， 还能够显著提高总吞吐量和功率效率二者的增益。
在进行数据传输之前， 发射端需要进行预编码， 现有技术中针对点对多点的多用户 预编码方案为：
发射端将多个不同的数据包同时通过多天线信道传输至多个不同的接收端， 此时， 发射端的预编码使得不同的数据包在各自的单链路信道上并行传输。发射端的预编码信 息通过发射端已知的发射端至所有接收端的信道信息计算获得， 也可以通过所有接收端 的反馈计算获得。
如图 1所示， 不同接收端的输出信号可表示为：
Figure imgf000003_0001
) 其中， Hl和 H2分别为发射端至不同接收端的单链路信道信息， Pi和 P 2为不同接收 端对应的最优预编码信息， 和 为不同接收端上的加性噪声向量，括号中的内容为接 收端接收到的干扰信号。
在实现本发明的过程中， 发明人发现现有技术中至少存在如下问题：
现有针对点对多点传输场景下的预编码设计，发射端将多个不同的数据包同时通过 多天线信道传输至多个不同的接收端。 而在协作中继系统中， 发射端需要将相同的数据 同时传输至多个不同的接收端， 若发射端仍采用上述方法进行预编码， 各接收端将不能 获得相近的良好传输性能。 发明内容
本发明的实施例提供一种协作中继系统中预编码方法、 通信装置和中继装置， 发射 端能够以相近的良好传输性能将相同的信息同时传输至不同的中继站。
本发明实施例采用的技术方案为：
一种协作中继系统中预编码方法， 包括：
获取发射端至各中继站的本地最优子信道的预编码矩阵；
根据所述各本地最优子信道的预编码矩阵， 获取综合最优子信道的预编码矩阵。 一种协作中继系统中预编码方法， 包括：
接收发射端发送的经过综合最优子信道的预编码矩阵编码的数据；
所述综合最优子信道的预编码矩阵通过所述发射端至各中继站的本地最优子信道 的预编码矩阵确定。
一种通信装置， 包括：
第一获取模块， 用于获取所述通信装置至各中继站的本地最优子信道的预编码矩 阵；
第二获取模块， 用于根据所述各本地最优子信道的预编码矩阵， 获取综合最优子信 道的预编码矩阵。
一种中继装置， 包括：
接收模块， 用于接收发射端发送的经过综合最优子信道的预编码矩阵编码的数据； 所述综合最优子信道的预编码矩阵通过所述发射端至各中继装置的本地最优子信 道的预编码矩阵确定。
本发明实施例协作中继系统中预编码方法、 通信装置和中继装置， 发射端能够根据 至各中继站的本地最优子信道的预编码矩阵， 获取综合最优子信道的预编码矩阵， 并将 经过所述综合最优子信道的预编码矩阵编码的数据发送至各中继站。 与现有技术相比， 发射端能够将经过所述综合最优子信道的预编码矩阵编码的数据，通过所述综合最优子 信道同时发送至不同的中继站， 提升了协作中继系统中第一跳点对多点的传输性能， 使 得各中继站的性能相近， 且达到最优， 确保第二跳的协作传输性能， 实现了发射端的最 优预处理。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实施例或现有 技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面描述中的附图仅仅是本 发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还 可以根据这些附图获得其它的附图。
图 1为现有技术中点对多点的数据传输框图；
图 2为本发明实施例提供的协作中继系统中预编码方法流程图；
图 3为本发明实施例提供的协作中继系统中第一跳点对多点数据传输框图； 图 4为本发明实施例提供的协作中继系统中预编码方法流程图；
图 5、 图 6、 图 7、 图 8为本发明实施例提供的协作中继系统中预编码方法流程图； 图 5a、 图 6a、 图 7a、 图 8a为本发明实施例提供的协作中继系统中预编码方法示意 图；
图 9为本发明实施例提供的通信装置结构示意图；
图 10、 图 11为本发明实施例提供的通信装置结构示意图；
图 12为本发明实施例提供的中继装置结构示意图。 具体实肺式
下面将结合本发明实施例中的附图， 对本发明实施例中的技术方案进行清楚、 完整 地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是全部的实施例。 基 于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有 其它实施例， 都属于本发明保护的范围。
为使本发明技术方案的优点更加清楚， 下面结合附图和实施例对本发明作详细说 明。
如图 2所示， 本发明实施例提供一种协作中继系统中预编码方法， 如图 3所示， 为 本发明实施例中协作中继系统中第一跳点对多点数据传输框图。 其中， 所述协作中继系 统中有多个不同的中继站， 发射端将相同的多流信息 a发送至多个不同的中继站， 所述 发射端可以为基站或用户终端； 所述多流信息 S fi Sl和 S2组成， S 1和 S2分别在不同 的天线上发送。发射端设计相应的预编码矩阵 p， 将发射的信号向量 8经过预编码处理 后， 发送至多个不同的中继站。
如图 2所示， 在发射端， 所述协作中继系统中预编码方法包括：
201、 获取至各中继站的本地最优子信道的预编码矩阵；
202、 根据所述各本地最优子信道的预编码矩阵， 获取综合最优子信道的预编码矩 阵。
其中， 发射端至每个中继站之间形成一个单链路， 每个单链路包括多个子信道， 所 述本地最优子信道为某个单链路的多个子信道中的单个或多个； 根据预编码理论可知， 预编码是将数据映射到多天线信道的最优单个或多个子信道上传输， 因此， 所述本地最 优子信道的预编码矩阵， 可以保证数据分别在发射端至不同中继站的单链路的本地最优 子信道上传输； 为确保各中继站上的传输性能相似， 且达到最优， 需要保证数据在各单 链路的本地最优子信道构成的综合最优子信道上传输， 因此需要获取综合最优子信道的 预编码矩阵。
本发明实施例协作中继系统中预编码方法，发射端能够根据发射端至各中继站的本 地最优子信道的预编码矩阵， 获取综合最优子信道的预编码矩阵。 与现有技术相比， 发 射端能够将经过所述综合最优子信道的预编码矩阵编码的数据，通过所述综合最优子信 道同时发送至不同的中继站， 提升了协作中继系统中第一跳点对多点的传输性能， 使得 各中继站的性能相近， 且达到最优， 确保第二跳的协作传输性能， 实现了发射端的最优 预处理。
如图 4所示， 本发明实施例提供一种协作中继系统中预编码方法， 在中继站， 所述 协作中继系统中预编码方法包括：
401、 接收发射端发送的经过综合最优子信道的预编码矩阵编码的数据； 所述综合最优子信道的预编码矩阵通过所述发射端至各中继站的本地最优子信道 的预编码矩阵确定。
本发明实施例协作中继系统中预编码方法， 中继站能够接收发射端发送的经过综合 最优子信道的预编码矩阵编码的数据，所述综合最优子信道的预编码矩阵通过所述发射 端至各中继站的本地最优子信道的预编码矩阵确定。 与现有技术相比， 不同的中继站能 够通过所述综合最优子信道同时接收所述发射端发送的经过所述综合最优子信道的预 编码矩阵编码的数据， 提升了协作中继系统中第一跳点对多点的传输性能， 使得各中继 站的性能相近， 且达到最优， 确保第二跳的协作传输性能， 实现了不同中继站以相近的 良好传输性能接收数据。
如图 5所示， 本发明实施例提供一种协作中继系统中预编码方法。 如图 5a所示， 所述协作中继系统中有两个中继站 RS1和 RS2， 发射端分别接收中继站 RS1和 RS2发送 的单链路信道信息 Ηι和 H2， 并将综合最优子信道的预编码矩阵 P分别向中继站 RS1 和 RS2发送。 发射端将相同的多流信息 S发送至两个不同的中继站 RS1和 RS2， 所述发射端可以 为基站或用户终端。 其中， 发射端的天线数为 4， 两个中继站 RS1和 RS2的接收天线数 各为 2， 发射端到向每个中继站发送的信息流数为 2， 所述多流信息 S由 S1和 S2组成， S1和 S2分别在不同的天线上发送。 发射端设计相应的预编码矩阵 P， 将发射的多个信息流 S经过预编码处理后， 发送 至中继站 RS1和 RS2， 中继站 RS1和 RS2的输出信号如式（1)所示：
Figure imgf000007_0001
其中， ηι为发射端至中继站 RS1 的单链路信道信息， 为发射端至中继站 RS2 的单链路信道信息； ηι为中继站 RS1上的加性噪声向量， 112为中继站 RS2上的加性噪 声向量。 由式（1)可以得知， 为了获得中继站 RS1和 RS2的输出信号 和 ^， 需要获取发射 端的预编码矩阵？。 如图 5所示， 所述协作中继系统中预编码方法包括：
501、发射端接收中继站 RS1发送的发射端至中继站 RS1的单链路信道信息 Ηι， 以 及中继站 RS2发送的发射端至中继站 RS2的单链路信道信息 Η2。
502、 发射端将所述单链路信道信息 Ηι和 Η2进行 SVD ( Singular Value Decomposition, 奇异值分解） 运算：
Figure imgf000007_0002
其中， Ui、 Vi和 U2、 V2均为 4 X 4阶酉矩阵， ∑1和∑2为对角阵， （Χ 为矩阵 X 的共轭转置 （厄尔米特） 运算， 其中， X可以为 Vi或 V2 ;
根据式 (2)所述的 SVD运算结果， 发射端获取所述各本地最优子信道的预编码矩阵
Ρι和 P2如式（3)所示：
Figure imgf000008_0001
其中， （χ)1:2分别为矩阵 X的前两列构成的子矩阵， 其中， X可以为 Vi或 V2。 503、 发射端对获取得到的 Ρι和 Ρ2进行 SVD运算，
Figure imgf000008_0002
其中， U和 V均为 4 x 4阶酉矩阵， ∑为对角阵， 为矩阵 V的共轭转置 （厄尔 米特） 运算；
发射端根据所述 SVD运算结果， 获取综合最优子信道的预编码矩阵 Ρ， 如式 (5)所 示：
P = U1:2 (5) 其中， ul:2为矩阵 u的前两列构成的子矩阵。
504、 发射端将经过所述综合最优子信道的预编码矩阵 P编码的数据发送至中继站
RS 1和 RS2。
为进一步使得中继站可以实现正确译码，发射端可以进一步将发射端所采用的预编 码信息反馈给中继站， 因此， 本发明实施例可以进一步包括：
505、 在 DRS ( Dedi cated Reference S i gnal , 解调专用导频） 的承载下， 发射端将 所述综合最优子信道的预编码矩阵 P分别反馈至中继站 RS 1和 RS2。
506、 中继站 RS I和 RS2分别根据所述综合最优子信道的预编码矩阵 P， 实现对所 接收数据的正确译码。
本发明实施例协作中继系统中预编码方法，发射端能够根据发射端至各中继站的本 地最优子信道的预编码矩阵， 获取综合最优子信道的预编码矩阵， 并将经过所述综合最 优子信道的预编码矩阵编码的数据发送至各中继站，提升了协作中继系统中第一跳点对 多点的传输性能，使得各中继站的性能相近，且达到最优，确保第二跳的协作传输性能， 实现了发射端的最优预处理； 此外， 发射端能够将所述综合最优子信道的预编码矩阵反 馈至各中继站，使各中继站能够实现正确译码，确保了协作中继系统中数据的正确收发， 降低了系统的反馈开销。
如图 6所示， 本发明实施例提供一种协作中继系统中预编码方法。 如图 6a所示， 所述协作中继系统中有两个中继站 RS1和 RS2， 发射端分别接收中继站 RS1和 RS2发送 的本地 PMI (Pre-coding Matrix Indication, 预编码矩阵指示） 值"^ z禾口 "Lz， 并将 综合最优子信道的预编码矩阵 P分别向中继站 RS1和 RS2发送。
如图 6所示， 所述协作中继系统中预编码方法包括：
601、发射端接收中继站 RS1发送的 PMI值" ^，以及中继站 RS2发送的 PMI值"^。
602、 发射端根据所述 PMI 值" l 和" M， 基于与中继站约定的码本 C， 获取所述 各本地最优子信道的预编码矩阵 Ρι和 A：
Figure imgf000009_0001
在基于码本的预编码中， 发射端和中继站在通信前事先设定一个码本 c， 所述码本
C = {Ci,C2"..， c^}
C中包含若干个预编码码字 。 基于码本的预编码可以有效地降低 信道的反馈开销。
在发射端进行信息发送之前， 中继站都会根据当前的信道特性， 从该码本 c中选取 一个认为最好的预编码码字 （此时， 如果发送端采用该码字进行预编码后发送， 接收端 会有最好的性能）， 并将该码字在码本中所对应的索引反馈给发送端。 发送端再根据反 馈信息， 从码本中选取与该索引相对的码字对发送信号进行预编码。 也就是说， 在基于 码本的预编码中， 反馈信息的形式为码字所对应的索引。
603-606、 根据获得的 Ρι和 获取综合最优子信道的预编码矩阵 P， 进一步发射端 可以将发射端所采用的预编码信息反馈给中继站， 具体可以参照步骤 503-506， 在此不 再赘述。
本发明实施例协作中继系统中预编码方法，发射端能够根据发射端至各中继站的本 地最优子信道的预编码矩阵， 获取综合最优子信道的预编码矩阵， 并将经过所述综合最 优子信道的预编码矩阵编码的数据发送至各中继站，提升了协作中继系统中第一跳点对 多点的传输性能，使得各中继站的性能相近，且达到最优，确保第二跳的协作传输性能， 实现了发射端的最优预处理； 此外， 发射端能够将所述综合最优子信道的预编码矩阵反 馈至各中继站，使各中继站能够实现正确译码，确保了协作中继系统中数据的正确收发， 降低了系统的反馈开销。
如图 7所示， 本发明实施例提供一种协作中继系统中预编码方法。 如图 7a所示， 所述协作中继系统中有两个中继站 RS 1和 RS2， 发射端分别接收中继站 RS 1和 RS2发送 的本地 PMI值" l 和"^ z，并将综合最优子信道的预编码矩阵 P对应的最佳 PMI值 向 中继站 RS 1和 RS2发送。
如图 7所示， 所述协作中继系统中预编码方法包括：
701-702、可以参照步骤 601-602，通过中继站发送的 PMI值确定各本地最优子信道 的预编码矩阵。
703-704、 可以参照步骤 503-504， 根据获取得到的 Ρι和 获取综合最优子信道的 预编码矩阵 P。
进一步， 本发明实施例中发射端可以将发射端所采用的预编码信息反馈给中继站， 以便中继站实现正确译码， 因此本发明实施例还可以包括：
705、 发射端根据所述综合最优子信道的预编码矩阵 P， 以及所述与中继站约定的 码本 C， 获取所述综合最优子信道的预编码矩阵 P对应的最佳 PMI值" p ：
Ί*— C
(7)
706、 发射端将所述最佳 PMI值" p 向中继站 RS 1和 RS2发送。
707、 中继站 RS 1和 RS2分别根据所述最佳 PMI值 ^， 以及与所述发射端约定的 码本 C， 获取所述综合最优子信道的预编码矩阵 P。
708、 中继站 RS I和 RS2分别根据所述综合最优子信道的预编码矩阵 P， 实现对所 接收数据的正确译码。
本发明实施例协作中继系统中预编码方法，发射端能够根据发射端至各中继站的本 地最优子信道的预编码矩阵， 获取综合最优子信道的预编码矩阵， 并将经过所述综合最 优子信道的预编码矩阵编码的数据发送至各中继站，提升了协作中继系统中第一跳点对 多点的传输性能，使得各中继站的性能相近，且达到最优，确保第二跳的协作传输性能， 实现了发射端的最优预处理； 此外， 发射端能够将最佳 PMI值发送至各中继站， 各中继 站根据所述最佳 PMI值获取所述综合最优子信道的预编码矩阵， 从而实现正确译码， 确 保了协作中继系统中数据的正确收发， 降低了系统的反馈开销。
如图 8所示， 本发明实施例提供一种协作中继系统中预编码方法。 如图 8a所示， 所述协作中继系统中有两个中继站 RS 1和 RS2， 发射端分别接收中继站 RS 1和 RS2发送 的本地 PMI值 n 和 NFLM， 并将混合 PMI值 n 向中继站 RS 1和 RS2发送。
如图 8所示， 所述协作中继系统中预编码方法包括：
801-802、可以参照步骤 601-602，通过中继站发送的 PMI值确定各本地最优子信道 的预编码矩阵。
803-804、 可以参照步骤 503-504， 根据获取得到的 和 获取综合最优子信道的 预编码矩阵 P。
进一步， 本发明实施例中发射端可以将发射端所采用的预编码信息反馈给中继站， 以便中继站实现正确译码， 因此本发明实施例还可以包括：
805、 发射端根据所述 PMI值 AM和 N PM， 获取混合 ΡΜΙ值 η;：
NPMI = PM㊉ PM (8)
806、 发射端将所述混合 ΡΜΙ值"^？向中继站 RS 1和 RS2发送。
807、 由于中继站 RS 1和 RS2分别已知各自的本地预编码对应的 ΡΜΙ值 和 因此， 中继站 RS 1和 RS2通过各自的本地预编码对应的 ΡΜΙ值"^ 7和 N M与混合的 PMI 值 n 进行逻辑运算， 获取相邻中继站的本地预编码对应的 PMI值 M和 /：
Figure imgf000011_0001
其中， 为中继站 RS I相邻中继站的本地预编码对应的 PMI值， " 为中继站 RS2 相邻中继站的本地预编码对应的 PMI值；
808、 中继站 RS 1和 RS2分别获取各自的本地预编码矩阵和相邻中继站的本地预编 码矩阵 Ρι和
= c
P， = c
( 10)
其中， x为 1或 2。
809、如式（4)所示， 中继站 RS 1和 RS2分别对 Ρι和 进行 SVD运算， 根据所述 SVD 运算结果， 中继站 RSI和 RS2获取综合最优子信道的预编码矩阵 P。
810、 中继站 RS1和 RS2分别根据所述综合最优子信道的预编码矩阵 P， 实现对所 接收数据的正确译码。
上述本发明实施例中以中继系统中包含两个中继站为例，但本发明实施例的方法并 不限应用于中继系统仅包含两个中继站， 可应用于包含多于两个中继站的中继系统。
本发明实施例协作中继系统中预编码方法，发射端能够根据发射端至各中继站的本 地最优子信道的预编码矩阵， 获取综合最优子信道的预编码矩阵， 并将经过所述综合最 优子信道的预编码矩阵编码的数据发送至各中继站，提升了协作中继系统中第一跳点对 多点的传输性能，使得各中继站的性能相近，且达到最优，确保第二跳的协作传输性能， 实现了发射端的最优预处理； 此外， 发射端能够将混合 PMI值发送至各中继站， 各中继 站根据所述混合 PMI值获取所述综合最优子信道的预编码矩阵， 从而实现正确译码， 确 保了协作中继系统中数据的正确收发， 降低了系统的反馈开销。
如图 9所示， 本发明实施例提供一种通信装置， 所述通信装置， 包括：
第一获取模块 91，用于获取所述通信装置至各中继站的本地最优子信道的预编码矩 阵；
第二获取模块 92， 用于根据所述第一获取模块 91获取的各本地最优子信道的预编 码矩阵， 获取综合最优子信道的预编码矩阵。
本发明实施例通信装置，所述通信装置能够根据至各中继站的本地最优子信道的预 编码矩阵， 获取综合最优子信道的预编码矩阵。 与现有技术相比， 所述通信装置能够将 经过所述综合最优子信道的预编码矩阵编码的数据，通过所述综合最优子信道同时发送 至不同的中继站， 提升了协作中继系统中第一跳点对多点的传输性能， 使得各中继站的 性能相近， 且达到最优， 确保第二跳的协作传输性能， 实现了所述通信装置的最优预处 理。
如图 10、 图 11所示， 本发明实施例提供一种通信装置， 所述通信装置， 包括： 第一获取模块 91，用于获取所述通信装置至各中继站的本地最优子信道的预编码矩 阵；
第二获取模块 92， 用于根据所述第一获取模块 91获取的各本地最优子信道的预编 码矩阵， 获取综合最优子信道的预编码矩阵。
如图 10所示， 所述第一获取模块 91可以包括：
第一接收单元 911， 用于接收各中继站发送的所述通信装置至各中继站的单链路信 道信息；
第一获取单元 912，用于对所述第一接收单元 911接收的各单链路信道信息进行 SVD 运算， 根据所述 SVD运算结果， 获取所述各本地最优子信道的预编码矩阵。
所述第二获取模块 92可以包括：
第二获取单元 921， 用于对所述第一获取单元 912获取的各本地最优子信道的预编 码矩阵进行 SVD运算， 根据所述 SVD运算结果， 获取综合最优子信道的预编码矩阵。
如图 11所示， 所述第一获取模块 91还可以包括：
第二接收单元 913， 用于接收各中继站发送的预编码矩阵的指示值；
第三获取单元 914， 用于根据所述第二接收单元 913接收的预编码矩阵的指示值， 基于所述通信装置与中继站约定的码本， 获取所述各本地最优子信道的预编码矩阵； 所述第二获取模块 92还可以包括：
第四获取单元 922， 用于对所述第三获取单元 914获取的各本地最优子信道的预编 码矩阵进行奇异值分解运算， 根据所述奇异值分解运算结果， 获取综合最优子信道的预 编码矩阵。
如图 10、 图 11所示， 所述通信装置， 还可以包括：
反馈模块 93，用于通过解调专用导频将所述综合最优子信道的预编码矩阵反馈至所 述各中继站。
如图 11所示， 所述通信装置， 还可以包括：
第三获取模块 94，用于根据所述第四获取单元获取 922的综合最优子信道的预编码 矩阵， 以及所述与中继站约定的码本， 获取最佳预编码矩阵的指示值；
发送模块 95， 用于将所述最佳预编码矩阵的指示值向各中继站发送。
如图 11所示， 所述第三获取模块 94， 还用于根据所述第二接收单元 913接收的预 编码矩阵的指示值， 获取混合预编码矩阵的指示值；
所述发送模块 95， 还用于将所述混合预编码矩阵的指示值向各中继站发送。
本发明实施例通信装置，所述通信装置能够根据至各中继站的本地最优子信道的预 编码矩阵， 获取综合最优子信道的预编码矩阵， 以使所述通信装置能够将经过所述综合 最优子信道的预编码矩阵编码的数据，通过所述综合最优子信道同时发送至不同的中继 站， 提升了协作中继系统中第一跳点对多点的传输性能， 使得各中继站的性能相近， 且 达到最优， 确保第二跳的协作传输性能， 实现了所述通信装置的最优预处理； 此外， 所 述通信装置能够将所述综合最优子信道的预编码矩阵反馈至各中继站，或者，将最佳 PMI 值或混合 PMI值发送至各中继站， 由各中继站根据所述最佳 PMI值或混合 PMI值获取所 述综合最优子信道的预编码矩阵， 使各中继站能够实现正确译码， 确保了协作中继系统 中数据的正确收发， 降低了系统的反馈开销。
如图 12所示， 本发明实施例提供一种中继装置， 所述中继装置， 包括： 接收模块 121， 用于接收发射端发送的经过综合最优子信道的预编码矩阵编码的数 据；
所述综合最优子信道的预编码矩阵通过所述发射端至各中继装置的本地最优子信 道的预编码矩阵确定。
本发明实施例中继装置，所述中继装置能够接收发射端发送的经过综合最优子信道 的预编码矩阵编码的数据，所述综合最优子信道的预编码矩阵通过所述发射端至各中继 装置的本地最优子信道的预编码矩阵确定。 与现有技术相比， 不同的中继装置能够通过 所述综合最优子信道同时接收所述发射端发送的经过所述综合最优子信道的预编码矩 阵编码的数据， 提升了协作中继系统中第一跳点对多点的传输性能， 使得各中继装置的 性能相近， 且达到最优， 确保第二跳的协作传输性能， 实现了不同中继装置以相近的良 好传输性能接收数据。
如图 12所示， 所述中继装置， 还可以包括：
接收模块 121， 用于接收发射端发送的经过综合最优子信道的预编码矩阵编码的数 据；
所述综合最优子信道的预编码矩阵通过所述发射端至各中继装置的本地最优子信 道的预编码矩阵确定。
其中， 所述接收模块 121， 还用于接收所述发射端通过解调专用导频发送的所述综 合最优子信道的预编码矩阵。
其中， 所述接收模块 121， 还用于接收发射端发送的最佳预编码矩阵的指示值； 所述中继装置还包括第一获取模块 122， 用于根据所述最佳预编码矩阵的指示值， 以及与所述发射端约定的码本， 获取所述综合最优子信道的预编码矩阵。
其中，所述接收模块 121，还用于接收所述发射端发送的混合预编码矩阵的指示值; 所述中继装置还包括第二获取模块 123， 用于将本地预编码对应的预编码矩阵的指 示值与所述混合预编码矩阵的指示值进行逻辑运算，获取相邻中继装置的预编码矩阵的 指示值； 根据本地预编码对应的预编码矩阵的指示值和相邻中继装置的本地预编码对应 的预编码矩阵的指示值， 获取本地预编码矩阵和相邻中继装置的本地预编码矩阵； 对所 述本地预编码矩阵和相邻中继装置的本地预编码矩阵进行奇异值分解运算，根据所述奇 异值分解运算结果， 获取所述综合最优子信道的预编码矩阵。
本发明实施例中继装置，所述中继装置能够接收发射端发送的经过综合最优子信道 的预编码矩阵编码的数据，所述综合最优子信道的预编码矩阵通过所述发射端至各中继 装置的本地最优子信道的预编码矩阵确定，从而提升了协作中继系统中第一跳点对多点 的传输性能， 使得各中继装置的性能相近， 且达到最优， 确保第二跳的协作传输性能， 实现了不同中继装置以相近的良好传输性能接收数据； 此外， 所述中继装置能够接收发 射端反馈的所述综合最优子信道的预编码矩阵， 或者， 接收发射端发送的最佳 PMI值或 混合 PMI值，根据所述最佳 PMI值或混合 PMI值获取所述综合最优子信道的预编码矩阵， 从而实现正确译码， 确保了协作中继系统中数据的正确收发， 降低了系统的反馈开销。
本发明实施例提供的通信装置和中继装置可以实现上述提供的方法实施例。本发明 实施例提供的方法、 通信装置和中继装置可以适用于协作中继系统中， 发射端与中继站 之间的预编码， 但不仅限于此。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程， 是可以通 过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质 中， 该程序在执行时， 可包括如上述各方法的实施例的流程。 其中， 所述的存储介质可 为磁碟、 光盘、 只读存储记忆体（Read-Only Memory, ROM)或随机存储记忆体（Random Access Memory, RAM) 等。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限于此， 任何 熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易想到的变化或替换， 都 应涵盖在本发明的保护范围之内。 因此， 本发明的保护范围应该以权利要求的保护范围 为准。

Claims

权利要求
1、 一种协作中继系统中预编码方法， 其特征在于， 包括：
获取发射端至各中继站的本地最优子信道的预编码矩阵；
根据所述各本地最优子信道的预编码矩阵， 获取综合最优子信道的预编码矩阵。
2、 根据权利要求 1所述的协作中继系统中预编码方法， 其特征在于， 所述获取发 射端至各中继站的本地最优子信道的预编码矩阵包括： 接收各中继站发送的发射端至各中继站的单链路信道信息 … H" ； 对所述 — 7 ^进行奇异值分解运算， 根据所述奇异值分解运算结果， 获取所述 各本地最优子信道的预编码矩阵 Ρι… Ρ"；
所述根据所述各本地最优子信道的预编码矩阵， 获取综合最优子信道的预编码矩阵 包括： 对所述 Ρι… 进行奇异值分解运算， 根据所述奇异值分解运算结果， 获取综合最 优子信道的预编码矩阵。
3、 根据权利要求 1所述的协作中继系统中预编码方法， 其特征在于， 所述获取发 射端至各中继站的本地最优子信道的预编码矩阵包括： 接收各中继站发送的预编码矩阵的指示值 … ； 根据所述预编码矩阵的指示值" ^^…"^^， 基于与中继站约定的码本， 获取所述各 本地最优子信道的预编码矩阵 Ρι… Ρη；
所述根据所述各本地最优子信道的预编码矩阵，获取综合最优子信道的预编码矩阵 包括： 对所述 Ρι… 进行奇异值分解运算， 根据所述奇异值分解运算结果， 获取综合最 优子信道的预编码矩阵。
4、 根据权利要求 2或 3所述的协作中继系统中预编码方法， 其特征在于， 所述方 法还包括：
通过解调专用导频将所述综合最优子信道的预编码矩阵发送至所述各中继站。
5、 根据权利要求 3所述的协作中继系统中预编码方法， 其特征在于， 在所述获取 综合最优子信道的预编码矩阵之后， 还包括： 根据所述综合最优子信道的预编码矩阵， 以及所述发送端与各中继站约定的码本， 获取最佳预编码矩阵的指示值 M； 将所述最佳预编码矩阵的指示值 M向各中继站发送。
6、 根据权利要求 3所述的协作中继系统中预编码方法， 其特征在于， 在所述获取 综合最优子信道的预编码矩阵之后， 还包括： 根据所述预编码矩阵的指示值" M…"^^， 获取混合预编码矩阵的指示值" ^； 将所述混合预编码矩阵的指示值 ^向各中继站发送。
7、 一种协作中继系统中预编码方法， 其特征在于， 包括：
接收发射端发送的经过综合最优子信道的预编码矩阵编码的数据；
所述综合最优子信道的预编码矩阵由所述发射端通过所述发射端至各中继站的本 地最优子信道的预编码矩阵确定。
8、 根据权利要求 7所述的协作中继系统中预编码方法， 其特征在于， 所述方法还 包括：
接收所述发射端通过解调专用导频发送的所述综合最优子信道的预编码矩阵。
9、 根据权利要求 7所述的协作中继系统中预编码方法， 其特征在于， 所述方法还 包括：
接收所述发射端发送的最佳预编码矩阵的指示值；
根据所述最佳预编码矩阵的指示值， 以及中继站与所述发射端约定的码本， 获取所 述综合最优子信道的预编码矩阵。
10、 根据权利要求 7所述的协作中继系统中预编码方法， 其特征在于， 所述方法还 包括：
接收所述发射端发送的混合预编码矩阵的指示值；
将本地预编码对应的预编码矩阵的指示值与所述混合预编码矩阵的指示值进行逻 辑运算， 获取相邻中继站的本地预编码对应的预编码矩阵的指示值；
根据本地预编码对应的预编码矩阵的指示值和相邻中继站的本地预编码对应的预 编码矩阵的指示值， 获取本地预编码矩阵和相邻中继站的本地预编码矩阵；
对所述本地预编码矩阵和相邻中继站的本地预编码矩阵进行奇异值分解运算，根据 所述奇异值分解运算结果， 获取所述综合最优子信道的预编码矩阵。
11、 一种通信装置， 其特征在于， 包括： 第一获取模块， 用于获取所述通信装置至各中继站的本地最优子信道的预编码矩 阵；
第二获取模块， 用于根据所述第一获取模块获取的各本地最优子信道的预编码矩 阵， 获取综合最优子信道的预编码矩阵。
12、 根据权利要求 11所述的通信装置， 其特征在于， 所述第一获取模块包括： 第一接收单元，用于接收各中继站发送的所述通信装置至各中继站的单链路信道信 自 .
第一获取单元，用于对所述第一接收单元接收的各单链路信道信息进行奇异值分解 运算， 根据所述奇异值分解运算结果， 获取所述各本地最优子信道的预编码矩阵； 所述第二获取模块包括：
第二获取单元，用于对所述第一获取单元获取的各本地最优子信道的预编码矩阵进 行奇异值分解运算，根据所述奇异值分解运算结果，获取综合最优子信道的预编码矩阵。
13、 根据权利要求 11所述的通信装置， 其特征在于， 所述第一获取模块包括： 第二接收单元， 用于接收各中继站发送的预编码矩阵的指示值；
第三获取单元， 用于根据所述第二接收单元接收的预编码矩阵的指示值， 基于所述 通信装置与中继站约定的码本， 获取所述各本地最优子信道的预编码矩阵；
所述第二获取模块包括：
第四获取单元，用于对所述第三获取单元获取的各本地最优子信道的预编码矩阵进 行奇异值分解运算，根据所述奇异值分解运算结果，获取综合最优子信道的预编码矩阵。
14、 根据权利要求 12或 13所述通信装置， 其特征在于， 还包括：
反馈模块，用于通过解调专用导频将所述综合最优子信道的预编码矩阵反馈至所述 各中继站。
15、 根据权利要求 13所述的通信装置， 其特征在于， 还包括：
第三获取模块， 用于根据所述第四获取单元获取的综合最优子信道的预编码矩阵， 以及所述与中继站约定的码本， 获取最佳预编码矩阵的指示值；
发送模块， 用于将所述最佳预编码矩阵的指示值向各中继站发送。
16、 根据权利要求 14所述的通信装置， 其特征在于， 所述第三获取模块， 还用于 根据所述第二接收单元接收的预编码矩阵的指示值， 获取混合预编码矩阵的指示值； 所述发送模块， 还用于将所述混合预编码矩阵的指示值向各中继站发送。
17、 一种中继装置， 其特征在于， 包括： 接收模块， 用于接收发射端发送的经过综合最优子信道的预编码矩阵编码的数据； 所述综合最优子信道的预编码矩阵通过所述发射端至各中继装置的本地最优子信 道的预编码矩阵确定。
18、 根据权利要求 17所述的中继装置， 其特征在于， 所述接收模块， 还用于接收 所述发射端通过解调专用导频发送的所述综合最优子信道的预编码矩阵。
19、 根据权利要求 17所述的中继装置， 其特征在于， 所述接收模块， 还用于接收 发射端发送的最佳预编码矩阵的指示值；
所述中继装置还包括第一获取模块， 用于根据所述最佳预编码矩阵的指示值， 以及 与所述发射端约定的码本， 获取所述综合最优子信道的预编码矩阵。
20、 根据权利要求 17所述的中继装置， 其特征在于， 所述接收模块， 还用于接收 所述发射端发送的混合预编码矩阵的指示值；
所述中继装置还包括第二获取模块，用于将本地预编码对应的预编码矩阵的指示值 与所述混合预编码矩阵的指示值进行逻辑运算， 获取相邻中继装置的预编码矩阵的指示 值； 根据本地预编码对应的预编码矩阵的指示值和相邻中继装置的本地预编码对应的预 编码矩阵的指示值， 获取本地预编码矩阵和相邻中继装置的本地预编码矩阵； 对所述本 地预编码矩阵和相邻中继装置的本地预编码矩阵进行奇异值分解运算，根据所述奇异值 分解运算结果， 获取所述综合最优子信道的预编码矩阵。
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