Patent ID: 7515655
Filing Date: 2009-04-07
Classification: H04B,H04L,H04W

Abstract:
1. A wireless communication apparatus which receives, by multiple antennas, receive signals created by spatially multiplexing multiple transmit streams subjected to power allocation, the wireless communication apparatus comprising: a channel matrix estimator which estimates a channel matrix of spatially multiplexed channels based on the received signals; a receive buffer which temporarily stores the receive signals; a spatial demultiplexer which obtains an antenna receive weight matrix from the estimated channel matrix and demultiplexes the receive signals temporarily stored in the receive buffer into multiple receive streams by multiplying the receive signals by the antenna receive weight matrix; wherein the receive signals that have been demultiplexed using the channel matrix are stored in the receive buffer; and a power estimator which estimates power allocation information as to each stream; wherein the channel matrix estimator re-estimates the channel matrix based on the power allocation information; and wherein the spatial demultiplexer re-demultiplexes the demultiplexed receive signals in the receive buffer according to the re-estimated channel matrix.