Patent ID: 8743857
Filing Date: 2014-06-03
Classification: H04B

Abstract:
1. A method, comprising: converting a beamforming matrix to a converted matrix having a lower left triangle of zeros by multiplying the beamforming matrix by a unitary matrix that does not change a subspace of the beamforming matrix; quantizing a first column vector having a fewest number of elements of the converted matrix using a codebook, the first column vector being represented by a first codebook index; determining a Householder matrix from the quantized column vector; multiplying the converted matrix on the left by the Householder matrix determined from the quantized first column vector; recursively repeating quantizing, determining a Householder matrix from further column vectors of the converted matrix using a codebook and representing each respective column vector by further corresponding codebook index, and multiplying the converted matrix on the left by the determined Householder matrix for each respective column vectors; and transmitting the first codebook index and further codebook indices to a remote station for use in beamforming by the remote station.