Patent ID: 7539253
Filing Date: 2009-05-26
Classification: H04B,H04L

Abstract:
1. A method performed by a wireless station in a closed loop multiple-input-multiple-output (MIMO) wireless network, the method comprising: quantizing a column of a beamforming matrix using a codebook; performing a Householder reflection on the beamforming matrix to reduce the dimensionality of the beamforming matrix; recursively repeating the quantizing and performing of Householder reflection on the previously dimensionality-reduced beamforming matrix in order to obtain a further reduction of dimensionality of the beamforming matrix; performing the preceding actions for each carrier of a subset of OFDM carriers to obtain quantized column vectors for the subset of OFDM carriers; and transmitting the quantized column vectors for the subset of OFDM carriers.