United States Patent 7,742,550
Olesen , et al. June 22, 2010
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Wireless communication apparatus using fast fourier transforms to create, optimize and incorporate a beam space antenna array in an orthogonal frequency division multiplexing receiver
Abstract
A wireless communication apparatus which uses fast Fourier transforms (FFTs) in an orthogonal frequency division multiplexing (OFDM) receiver which incorporates a beam space antenna array. The beam space antenna array may be implemented with a Butler matrix array. The beam space antenna array may be a circular array, vertical array, or a combination of both circular and vertical arrays, for providing the desired angular antenna coverage. In one embodiment, the antenna array is optimized because the FFTs are linear invariant transform operators, whereby the order of operations in the OFDM receiver can be interchanged.
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Inventors: Olesen; Robert Lind (Huntington, NY), Reznik; Alexander (Titusville, NJ), Pietraski; Philip J. (Huntington Station, NY), Yang; Rui (Greenlawn, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 12/269,271
Filed: November 12, 2008
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Application Number Filing Date Patent Number Issue Date
11586415 Nov., 2008 7453964
10991557 Jan., 2007 7164740
60523939 Nov., 2003
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Current U.S. Class: 375/347 ; 375/267
Current International Class: H04B 1/02 (20060101); H04B 7/10 (20060101)
Field of Search: 375/219,259,260,267,316,347,349 455/272,273,562,562.1,63.4 370/203,210,480
