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United States Patent
Khojastepour et al.
(io) Patent No.: (45) Date of Patent:
US 7,917,176 B2 Mar. 29, 2011
(21 (22 (65
STRUCTURED CODEBOOK AND
SUCCESSIVE BEAMFORMING FOR
Inventors: Mohammad Ali Khojastepour,
Plainsboro, NJ (US); Xiaodong Wang,
New York, NY (US); Mohammad
Madihian, Plainsboro, NJ (US)
Assignee: NEC Laboratories America, Inc.,
Princeton, NJ (US)
Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 758 days.
Filed: Feb. 13, 2007
Prior Publication Data
US 2007/0191066 Al Aug. 16, 2007
Related U.S. Application Data
Provisional application No. 60/743,290, filed on Feb. 14, 2006.
U.S. CI 455/562.1; 455/39; 370/203; 375/229;
Field of Classification Search 455/562.1
See application file for complete search history.
A quantized multi-rank beamforming scheme for multipleantenna 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.
17 Claims, 17 Drawing Sheets
U.S. PATENT DOCUMENTS
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2009/0046800 Al * 2/2009 Xuetal 375/267
2009/0097395 Al * 4/2009 Zhang et al 370/203
2009/0298424 Al * 12/2009 Liu et al 455/39
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