Generalized grasman code book constitution method and feedback method based thereon
A technology of Grassmann codebook and construction method, which is applied in space transmit diversity, electrical components, digital transmission systems, etc., can solve the problems of large search space and high complexity, simplify design, reduce requirements, and solve effective feedback problems Effect
Active Publication Date: 2008-06-25
SHANGHAI RES CENT FOR WIRELESS TECH
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However, the alternating projection algorithm is often used to design isometric frame codebooks, and the complexity of this method will be very high for a large search space
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[0028] Depend on figure 1 A multi-antenna transmitter with limited feedback precoding using a codebook-based quantization method and figure 2 The shown receiver constitutes a precoded MIMO transceiver system based on the codebook feedback method, which includes N t root transmit antenna and M r Root receiving antenna.
[0029] Assume that the input bit stream is distributed to L different bit streams through serial-to-parallel conversion. Then, after each bit stream is individually encoded and modulated, the corresponding symbol stream s=[s 1 ,s 2 ,...,s L ] T , the transmit power constraint is E[s H s]≤P T . then pass N t ×L-dimensional precoding matrix F for preprocessing to obtain precoded N t Dimensional emission signal x=Fs. The function of the precoding matrix F is to add redundancy to the input symbol stream to improve the performance of the system. The precoded output signal is transmitted into the MIMO channel by the transmitting antenna. Assuming that ...
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The invention provides a generalized Grassmann codebook construction method and a feedback method based on the construction method. First, the method takes a complex Grassmann codebook as a mother codebook, and takes a real Grassmann codebook as a father codebook; then, the method uses all code characters in the father codebook to extend and transform code characters in the mother codebook to create son codebooks; finally, the mother codebook and all the son codebooks form a generalized Grassmann codebook. The method simplifies the design of the codebook, can construct a codebook with needed size flexibly, and can lower the requirement on a memorizer greatly. In addition, the invention provides an effective feedback method based on the pre-coding matrix of the generalized Grassmann codebook. Firstly, the feedback method transforms the quantification of the pre-coding matrix into the individual quantification of all column vectors in the pre-coding matrix; then, the feedback method uses the generalized Grassmann codebook to quantify all the vectors and feed the quantified vectors back to a transmitter. The feedback method solves the effective feedback problem of the pre-coding matrix, and is applicable to the quantification and feedback for the pre-coding matrixes and beams in all closed-loop multi-antenna systems to form the vectors.
Description
technical field [0001] The present invention relates to a precoding matrix (or beamforming vector) feedback method and a codebook construction method in a precoding multi-antenna communication system, and is applied to a new generation of mobile communication systems using multi-antenna technology, such as B3G (Beyond 3rd Generation) / 4G . Background technique [0002] In recent years, communication systems that use multiple antennas (MIMO) at the transmitter and receiver at the same time have received great attention, because compared with traditional single-antenna communication systems, multi-antenna communication systems can greatly improve data transmission rates and It will become a key technology in the new generation of mobile communication system. Among them, space-division multiplexing and space-time coding are two commonly used multi-antenna technologies. Among the two multi-antenna technologies, the one that does not require channel state information (channel st...
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IPC IPC(8): H04L1/06H04B7/04H04L1/00H04L25/49
Inventor 易辉跃周志刚张小东周霁婷郭海友
Owner SHANGHAI RES CENT FOR WIRELESS TECH