Patent ID: 7218681
Filing Date: 2007-05-15
Classification: H04L

Abstract:
1. Method for reducing cross-talk in a communication system comprising a plurality of transmitters for transmitting encoded data signals via respective communications channels to a plurality of receivers and receiving back matrix updating information, said method comprising the steps of: processing training data signals in a transmitter utilizing an initial pre-coding matrix to produce a first pre-coded training signal; transmitting said first pre-coded training signal on a first communication channel; receiving from the first communication channel the matrix updating information computed at a first receiver on the other end of the first communication channel, the matrix updating information having been computed utilizing the transmitted first pre-coded training signal and a second pre-coding matrix located at the first receiver, the second pre-coding matrix responsive to a second pre-coded training signal from at least a second receiver; and updating said initial pre-coding matrix based on said matrix updating information, whereby said updating tends to offset channel impairments within said first communication channel.