Compensation techniques for group delay effects in transmit beamforming radio communication
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United States of America Patent
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Dec 11, 2007
Grant Date -
Nov 16, 2006
app pub date -
Jul 14, 2006
filing date -
Jun 9, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a wireless communication device, transmit weights are iteratively processed to compensate for any group delay caused by receive synchronization in the receive device. A transmit matrix of weights is computed from signals transmitted by a second communication device and received at a plurality of antennas of the first communication device. The transmit matrix processing includes normalizing a transmit weight vector with respect to a mode of the transmit weight associated with one of the plurality of antennas. The processed transmit matrix is then applied to a transmit signal to produce a plurality of transmit signals to be simultaneously transmitted from corresponding ones of the plurality of antennas of the first communication device. A plurality of eigenmodes is transmitted accordingly between the two devices in a converging iteration.
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