Patent ID: 7680203
Filing Date: 2010-03-16
Classification: H04L

Abstract:
1. A wireless communication apparatus for receiving spatially multiplexed signals via respective antennas, comprising: a channel matrix estimator for estimating a channel matrix for spatially multiplexed channels; a spatial decoder for decoding the received spatially multiplexed signals into respective individual stream signals by obtaining an antenna weight matrix from the estimated channel matrix, and multiplying the received spatially multiplexed signals by the antenna weight matrix; a likelihood information estimator for estimating, for each decoded stream signal, likelihood information according to the following equations: where {circumflex over (N)} l is the noise power of the decoded stream signal, Ŝ l is the signal power of the decoded stream signal, Î l is the interference power of the decoded stream signal, {dot over (h)} l is a channel vector for the decoded stream signal from the estimated channel matrix, {dot over (w)} l is an antenna weight vector for the decoded stream signal from the antenna weight matrix, and σ r 2 is an estimated noise power of a respective spatially multiplexed signal; and a soft decision decoder for performing soft decision decoding on each stream signal based on the respective estimated likelihood information.