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United States Patent 7,643,843
Pan , et al. January 5, 2010

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Method and system for transmit power control in a multiple-input multiple-output wireless communication system


Abstract
The present invention is related to a method and system for transmit power control in a multiple-input multiple-output (MIMO) wireless communication system. Both a transmitter and a receiver comprise multiple antennae for transmission and reception. The transmitter comprises a power allocation unit for controlling transmit power based on a feedback received from the receiver. The receiver comprises a channel estimator and a singular value decomposition (SVD) unit. The channel estimator generates a channel matrix from a signal received from the transmitter and the SVD unit decomposes the channel matrix into D, U and V matrices. The receiver sends a feedback generated based on output from the SVD unit to the transmitter for controlling the transmit power. The feedback may be one of an eigenvalue, a transmit power level or a power control bit or command. A hybrid scheme for selecting one of them based on channel condition may be implemented.


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Inventors: Pan; Jung-Lin (Selden, NY), Olesen; Robert Lind (Huntington, NY), Tsai; Yingming (Boonton, NJ)
Assignee: InterDigital Technology Corporation (Wilmington, DE)

Appl. No.: 11/152,511
Filed: June 14, 2005

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Current U.S. Class: 455/522 ; 455/126; 455/245.1; 455/69
Current International Class: H04B 7/00 (20060101)
Field of Search: 455/69,522,127.1,127.5,343.1-343.6,245.1,572-574