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