Generates a code book of equally spaced circular array, how to win a code word from the code book

摘要

The present invention proposes a technical solution of the codebook design suitable for an antenna at regular intervals circular array. Have a certain remainder, each column are orthogonal to each other, each codeword in the codebook is designed to have properties nested. Based on the codebook is designed, furthermore, the present invention provides a method of determining the codewords are constructed by using the N _t antennas equally spaced circular array, at the base station in a MIMO communication system, and a determining receiving a codeword index information from the user equipment, the target code word corresponding to the codeword index information from a set of codebooks according to a codeword index information, the set of codebook, the respective ranks and a codebook of the N _t corresponding to, it is determined based on the N _t × N _t Hadamard matrix and a codebook of rank 1, the first column of the Hadamard matrix, a codebook of the N _t is 1 and all or to provide a process which is -1 all. Compared with the Rel-10 codebook existing codebook designed in accordance with the present invention, can reduce the feedback overhead and improve the spectral efficiency of the user at the edge of the cell and average spectral efficiency of the cell.