Patent ID: 7542446
Filing Date: 2009-06-02
Classification: H04B,H04L

Abstract:
1. A method for transmitting an input stream of symbols in a multiple-input/multiple-output wireless communications system including M subgroups of transmitting antennas, comprising: selecting, according to channel conditions of the multiple-input/multiple-output wireless communications system, L subgroups of the M subgroups of antennas, where L<M and each of the L subgroups of antennas includes a set of at least two antennas; demultiplexing, the input stream into L substreams, there being one substream for each one of the L selected subgroups of at least two antennas; adaptively modulating and coding each of the L sub streams to a maximum data rate while achieving a predetermined performance on an associated channel used to transmit the substream; space-time transmit diversity encoding each of the L coded substreams into a set of at least two output streams, there being one output stream for each antenna in the set of at least two antennas of each one of the L subgroups of antennas, wherein the selecting is performed before the adaptively modulating and coding and the space-time transmit diversity encoding; and transmitting the set of at least two output streams using the L subgroups of at least two antennas.