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Pre-coding method and pre-coding system and construction method of pre-coding code book

A precoding and codebook technology, applied in the field of communication, can solve problems such as poor performance and poor performance of single-polarized antennas, and achieve the effect of small quantization error and good performance

Active Publication Date: 2010-01-20
ZTE CORP
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Problems solved by technology

[0022] When Rank=2, one of the codebooks needs to be selected for use, but codebook 1 has better performance under single-polarized antennas, but poor performance under dual-polarized antennas, and codebook 2 when Rank=2 is in Good performance with dual-polarized antennas, but poor performance with single-polarized antennas

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Embodiment Construction

[0074] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0075] For an 8-antenna multiple-input multiple-output (MIMO) system, including a transmitting end and a receiving end, the transmitting end and the receiving end jointly save the information of the precoding codebook, and the receiving end obtains the channel matrix according to the channel estimation, from the precoding code After a codeword is selected, the sequence number of the codeword is fed back to the transmitting end, and the transmitting end performs precoding on the symbol block sent to the receiving end according to the codeword found by the sequence number.

[0076] When Rank=1, the codewords matching the relevant channel in the precoding codebook information saved by the transmitting end and the receiving end should be selected from the following vector set U, and the U set is composed of n=1, 2, 3, 4 When corresponding to the ...

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Abstract

The invention discloses a pre-coding method, a pre-coding system and a construction method of a pre-coding code book. A transmitting terminal and a receiving terminal are used for storing the information of the pre-coding code book together; a code word is selected from the pre-coding code book by the receiving terminal according to an estimated channel matrix; the sequence number of the code word is fed back to the transmitting terminal; and symbol blocks transmitted to the receiving terminal are pre-coded through the code word by the transmitting terminal according to the code word found by the sequence number, wherein column vectors in at least eight code word vectors or at least eight code word matrixes in the pre-coding code book are obtained on the basis of an eight-dimensional vector selected from an eight-dimensional vector set, and the eight-dimensional vector set is obtained by computing partial or all four-dimensional vectors of u1, u2, u3, u4, u5, u6, u7, u8, s, m and n. The pre-coding method is used for the pre-coding of eight-antenna MIMO systems when the channel matrix is a singular matrix, and can enhance the pre-coding property. The four-dimensional vectors used for computing the code word can be stored only for saving storage space.

Description

technical field [0001] The present invention relates to a precoding method, a system and a precoding codebook construction method of a multiple-input multiple-output (MIMO) system in the communication field, and in particular to a precoding method when the channel matrix is ​​a low rank (Rank) in an 8-antenna MIMO system , a system and a method for constructing a precoding codebook. Background technique [0002] In wireless communication, if multiple antennas are used at both the sending end and the receiving end, we can adopt spatial multiplexing to obtain a higher rate, which can increase the transmission rate. Since the channel matrix experienced by the transmitted signal can be obtained at the receiving end through channel estimation, even if each antenna transmits different data, after the multiple transmission and multiple reception (MIMO) signal matrix, the receiving end can still solve the transmission on each antenna. data. [0003] Compared with the method of dir...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L25/03H04B7/06
CPCH04L25/03923H04L1/0029H04L1/06H04B7/0639H04B7/0417H04B7/0486
Inventor 陈艺戬郁光辉戴博杨勋
Owner ZTE CORP
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