Techniques utilizing adaptive codebooks for beamforming in wireless networks

摘要

An embodiment of the present invention provides a method, comprising using an adaptive codebook for beamforming for communications in wireless networks.

主权项

1. A method, comprising:
using an adaptive codebook for beamforming for communications in wireless networks, wherein phase information obtained from antenna correlation is used to transform the adaptive codebook by transforming a quantization matrix of the adaptive codebook to an expected direction of an input beamforming matrix, thereby allowing the adaptive codebook to vary with antenna correlation, wherein said adaptive codebook transformation takes the form: {tilde over (V)}i=orth(FVi), where {tilde over (V)}i is the i-th codeword of a new codebook, {tilde over (V)}i is the codeword of an original codebook, orth (X) converts the input matrix (or vector) X to an orthogonal matrix with orthonormal column(s) that span the same subspace as X's columns, and F is a Nt by Nt transformation matrix.