Space time transmit diversity with subgroup rate control and...

Details Space time transmit diversity with subgroup rate control and... Space time transmit diversity with subgroup rate control and...

2004-04-21

2009-06-02

Kincaid, Lester (Department: 2617)

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

C370S329000, C370S334000, C370S201000, C370S204000, C370S208000, C455S101000, C455S102000, C455S103000, C455S562100, C375S260000

Reexamination Certificate

active

07542446

ABSTRACT:
A method and system transmits an input stream of data symbols in a multiple-input/multiple-output wireless communications system that includes M subgroups of transmitting antennas. A stream of data symbols is provided to a combined switch and demultiplexer. The combined switch and demultiplexer selects a subset L of the M subgroups of antennas as active, where L<M. The demultiplexer then splits the data stream into L substreams, which are fed to the L subgroups of antennas. Before transmission, each of the L substreams is adaptively modulated and coded to a maximum data rate while achieving a predetermined performance on an associated channel used to transmit the substream. Space-time transmit diversity encoding is applied to each coded substream to generate multiple output streams, one output stream for each antenna of each of the L subgroups. The selection by the switch is based on channel conditions fed back by a receiver of the output streams.

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