Method and apparatus using a base codebook structure for beamforming

摘要

Techniques for a precoding scheme for wireless communications are described. A method and apparatus may comprise a first device for a communications system to determine a beamforming structure for a closed loop transmit beamforming scheme using channel information, one or more scaling factors and one or more integers to represent a complex vector. The beamforming structure may include a codeword, a codebook and a codeword index. Other embodiments are described and claimed.

主权项

1. A method, comprising:
determining a codebook with a plurality of codewords, the codebook subject to a constraint on a ratio between two real parts of each codeword; receiving channel information over a wireless channel by a first device from a second device, wherein the channel information comprises a channel matrix; determining a codeword from the plurality of codewords in the codebook using an inner product between a vector in each codeword and a vector in the channel matrix, wherein the vector in each codeword is factorized into a scaling factor and an integer factor; selecting a codeword index from the codebook based on the determined codeword; and sending the codeword index over a wireless channel from the first device to the second device.