Method and apparatus for acquiring a precoding matrix indicator and a precoding matrix

摘要

In the field of communication technologies, a method and an apparatus for acquiring a Precoding Matrix Indicator (PMI) and a Precoding Matrix (PM) are provided. The method includes: acquiring a reference PMI and a differential PMI according to a first non-differential codebook and a first diagonal differential codebook, where codewords included in the first diagonal differential codebook form a diagonal matrix. The apparatus includes a PMI acquiring module. Acquiring a reference PMI and a differential PMI according to a non-differential codebook and a diagonal differential codebook can reduce the feedback overhead or improve the feedback precision; and the fact that codewords included in the diagonal differential codebook form a diagonal matrix can maintain amplitude characteristics (for example, a constant modulus characteristic, and a finite character set constraint characteristic) of elements of the non-differential codebook or facilitate power distribution among antennas.

主权项

1. A method for acquiring a Precoding Matrix Indicator (PMI), comprising:
obtaining a first PMI and a second PMI, wherein the combination of the first PMI and the second PMI indicates a precoding matrix {circumflex over (V)}1 or {circumflex over (V)}2, the precoding matrix is used for generating data to be sent by a data sending end; and sending the first PMI and the second PMI to the data sending end; wherein the precoding matrixes {circumflex over (V)}1 and {circumflex over (V)}2 satisfy {circumflex over (V)}2=Ck2(Ck1)−1{circumflex over (V)}1, {circumflex over (V)}1 is a precoding matrix corresponding to a combination of a first PMI n and a second PMI k1, {circumflex over (V)}2 is a precoding matrix corresponding to a combination of the first PMI n and a second PMI k2, Ck1 is a codeword corresponding to the second PMI k1, Ck2 is a codeword corresponding to the second PMI k2, and each of the codeword Ck1 and Ck2 is a diagonal matrix.