Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2006-09-27
2011-12-06
Edouard, Patrick (Department: 2617)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S101000, C455S103000, C455S063400, C370S334000, C375S267000, C375S260000
Reexamination Certificate
active
08073486
ABSTRACT:
A system and method for opportunistically designing collaborative beamforming vectors is disclosed for a wireless multiple input, multiple output (MIMO) space division multiple access (SDMA) communication system by sequentially designing beamforming vectors for ranked channels in order to exploit the instantaneous channel conditions to improve per user average SNR performance. Each subscriber station independently transmits information to a base station that allows the base station to determine beamforming vectors for each subscriber station by ranking the subscriber stations by channel strength. Using sequential nullspace methods, the ranked channel matrices are then used to select the channel matrix Hifor the best subscriber station, to design the wi, vifor the best subscriber station as the left and right singular vectors of the MIMO channel matrix Hi, to transform the remaining channels and to continue the process until beamforming vectors are designed for all channels.
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Kotecha Jayesh H.
Mundarath Jayakrishnan C.
Apple Inc.
Casca Fred
Edouard Patrick
Gazdzinski & Associates, PC
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