Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
2011-04-05
2011-04-05
Afshar, Kamran (Department: 2617)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S310000, C370S328000, C370S334000, C455S115100, C455S063100
Reexamination Certificate
active
07920533
ABSTRACT:
A method and apparatus for calibration and channel state feedback to support transmit beamforming in a multiple-input multiple-output (MIMO) system are disclosed. For radio frequency (RF) calibration, a first station (STA) sends a calibration request to a second STA, and the second STA sends a sounding packet to the first STA. The first STA receives the sounding packet, performs at least one channel measurement and performs calibration based on the channel measurement. For channel state feedback, the first STA sends a channel state feedback request to the second STA. The second STA sends a sounding packet to the first STA. The first STA receives the sounding packet and performs at least one channel measurement with the sounding packet. The first STA then calculates a steering matrix for transmit beamforming based on the channel measurement.
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Chandra Arty
Koo Chang-Soo
Olesen Robert Lind
Voltz Peter J.
Wang Jin
Afshar Kamran
InterDigital Technology Corporation
Volpe and Koenig PC
Wang-Hurst Kathy
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