| 摘要 |
A pre-coding method and system and a method for constructing pre-coding codebook are disclosed, including: a transmitting end and a receiving end storing information of a pre-coding codebook together, the receiving end selecting a codeword from the pre-coding codebook according to an estimated channel matrix and feeding back a serial number of the codeword to the transmitting end, and the transmitting end finding out the codeword according to the serial number and pre-coding, by using the codeword, a symbol block sent to the receiving end; wherein, at least eight codeword vectors or column vectors in at least eight codeword matrixes in the pre-coding codebook are obtained based on 8-dimensional vectors selected from a 8-dimensional vector set, and this 8-dimensional vector set is obtained by calculating from the part or all of 4-dimensional vectors in u 1 ,u 2 ,u 3 ,u 4 ,u 5 ,u 6 ,u 7 ,u 8 ,s,m,n. The present invention is applied to the pre-coding in a MIMO system with 8 antennas when the rank of a channel matrix is low rank, so as to improve the pre-coding performance. Moreover, the 4-dimensional vectors used for calculating the codewords can be only stored, thus saving the storage space. |
