Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
2011-03-29
2011-03-29
Nguyen, Duc (Department: 2618)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S039000, C370S203000, C375S229000, C375S260000, C375S267000
Reexamination Certificate
active
07917176
ABSTRACT:
A quantized multi-rank beamforming scheme for multiple-antenna systems such as a multiple-input-multiple-output (MIMO) wireless downlink. User equipment (UE) estimates downlink channel and transmit power and determines rank and power allocations. A quantized beamforming matrix is then determined by the UE using successive beamforming. The UE also determines channel quality indices (CQI) which it feeds-back to the wireless downlink base station along with the index of the quantized beamforming matrix. The base station uses the CQI information to select a UE for scheduling of downlink transmission and the quantized beamforming matrix index received from the selected UE to beamform the downlink transmission to the UE. Base station overhead and is minimized while providing near-optimal performance given the constraints of a limited feed-back channel and computational complexity of the UE.
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Khojastepour Mohammad Ali
Madihian Mohammad
Wang Xiaodong
Brosemer, Kolefas & Associates
Kolodka Joseph
NEC Laboratories America, Inc.
Nguyen Duc
Nguyen Hai V
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