Codebook storage and information sending and receiving method and device using the codebook

Abstract

The invention discloses codebook storage and an information transceiving method and device using a codebook. The method comprises the following steps of: determining the codebook which has the following structure, wherein phi r expresses a 2*r-dimensional matrix, Wnr expresses an NT / 2*r-dimensional matrix, NT is the number of transmitting antennas, n is code word number and r is Rank number, the operational character o is the formula, wherein A (:, n) expresses the nth column of a matrix A, X in O expresses the direct product of the matrix, and if the A (:, n) is an M*1-dimensional vector, the codebook is stored. The codebook provided by the invention can be matched with the channel distribution property of a bipolarized antenna and the performance loss caused by minimum codebook quantity so as to effectively improve the performance of a precoding system.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a codebook storage and information sending and receiving method and device using the codebook. Background technique [0002] The MIMO (Multiple-Input Multiple-Output) system uses multiple transmitting and receiving antennas to obtain rate, diversity and array gain by joint processing of signals in the space, time and frequency domains. In a MIMO system, if the transmitter can know the channel information in a certain way, the transmitted signal can be optimized according to the channel characteristics, so as to improve the receiving quality and reduce the complexity requirement of the receiver. In an actual system, the feedback mode of quantized channel information is generally adopted to reduce feedback overhead and feedback delay. The quantization of the channel information can be aimed at the channel matrix and its statistics, and can also be the preprocessing parameters r...

AI Technical Summary

Problems solved by technology

[0013] Codebook 1 inherits most of the features of the Rel-8LTE4 antenna codebook: constant modulus, unitary, and nested features, and only uses 8PSK elements. Since codebook 1 is in 4 7 The codebook is searched in a space composed of 8×8 complex matrices with 8PSK elements as elements, and no special optimization is carried out for the channel characteristics of the dual-polarization multi-antenna system during the search process, resulting in the codebook being in the dual-polarization multi-antenna system performance loss in the system;

[0014] Codebook 2 inherits most of the characteristics of the Rel-8LTE4 antenna codebook: constant modulus, unitary, and nested characteristics, and only uses 8PSK elements, but the two sets of 4×4 matrices that constitute the 8-antenna codebook do not fully consider the characteristics of the channel. Especially in Rank3 and Rank4, there is a big loss in performance

[0015] Codebook 3 constitutes an 8-antenna codebook through the combination of four 8×8 matrices and the selection of column vectors. Since each Rank uses a different combination of matrices, Codebook 3 as a whole does not have the size of the Rel-8LTE4 antenna codebook. Some characteristics, and under Rank3, due to the lack of unitary characteristics, the performance has obvious loss

[0016] Codebook 4 inherits some of the features of the Rel-8LTE8 antenna codebook: constant modulus, unitary, and nested features, but uses 16PSK elements, which will increase the complexity of precoding calculations. If it cannot obtain significant performance compared to other codebooks gain, the increased complexity of precoding calculations will become an additional burden;

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