RF signal processing in multi-antenna systems
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United States of America Patent
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Jun 3, 2008
Grant Date -
Feb 3, 2005
app pub date -
Jul 29, 2003
filing date -
Jul 29, 2003
priority date (Note) -
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Abstract
A method for antenna subset selection by joint processing in RF and baseband in a multi-antenna systems. L.sub.t input data streams are generated in a transmitter for either diversity transmission or multiplexing transmission. These streams are modulated to RF signals. These signals are switched to the t branches associated with the t transmit antennas, and a phase-shift transformation is applied to the RF signals by a t.times.t matrix multiplication operator .PHI..sub.1, whose output are t.gtoreq.L.sub.t RF signals. These signals are transmitted over a channel by t antennas. The transmitted signals are received by r antennas in a receiver. A phase-shift transformation is applied to the r RF signals by a r.times.r matrix multiplication operator .PHI..sub.2. L.sub.r branches of these phase shifted streams are demodulated and further processed in baseband to recover the input data streams.
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