METHOD AND DEVICE FOR OBTAINING CHANNEL INFORMATION

摘要

The present invention discloses a method and a device for obtaining channel information, to solve the technical problem that the codebook in the prior art cannot support multiple precision of feedback. The method includes: for a sub-band, a terminal feeds the channel Rank Indicator (RI) information and at least one piece of Pre-coding Matrix Indicator (PMI) information back to a base station, wherein the PMI information includes PMI1 information; the base station finds a codeword W1 with the index number PMI1 from a four antenna codebook according to the RI information and the PMI1 information; or the base station finds a codeword W1 with the index number PMI1 from an eight antenna codebook according to the RI information and the PMI1 information; the base station obtains the sub-band channel information according to the codeword W1, a matrix W2 and a function F(W1, W2). The channel information obtaining technology provided by the present invention can provide multiple precision modes, can be flexibly applied in the channel information feedback and effectively uses the feedback overhead.