United States Patent 7,505,529
Kwak , et al. March 17, 2009
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Method and apparatus for implementing space frequency block coding in an orthogonal frequency division multiplexing wireless communication system
Abstract
The present invention is related to a method and apparatus for implementing space frequency block coding (SFBC) in an orthogonal frequency division multiplexing (OFDM) wireless communication system. The present invention is applicable to both a closed loop mode and an open loop mode. In the closed loop mode, power loading and eigen-beamforming are performed based on channel state information (CSI). A channel coded data stream is multiplexed into two or more data streams. Power loading is performed based on the CSI on each of the multiplexed data streams. SFBC encoding is performed on the data streams for each of the paired subcarriers. Then, eigen-beamforming is performed based on the CSI to distribute eigenbeams to multiple transmit antennas. The power loading may be performed on two or more SFBC encoding blocks or on each eigenmodes. Additionally, the power loading may be performed across subcarriers or subcarrier groups for weak eigenmodes.
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Inventors: Kwak; Jaeyoung (Morganville, NJ), Olesen; Robert Lind (Huntington, NY), Bultan; Aykut (Bayside, NY), Zeira; Eldad (Huntington, NY), Koo; Chang-Soo (Melville, NY), Ozluturk; Fatih (Port Washington, NY), Huang; Yuejin (Holbrook, NY), Pasad; Kalpendu R. (Hicksville, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/201,695
Filed: August 11, 2005
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
60601338 Aug., 2004
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Current U.S. Class: 375/295 ; 375/299
Current International Class: H04L 27/00 (20060101)
Field of Search: 375/260,267,347,395,295-297,299 370/208,210 455/91,101
