United States Patent 7,643,584
Kwak , et al. January 5, 2010
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Efficient joint detection
Abstract
Data signals are received over a shared spectrum in a code division multiple access communication format as a combined signal. The combined signal is sampled as a plurality of received vector versions. A plurality of system matrices and an associated covariance matrix using codes and estimated impulse responses of the data signals is produced. Each system matrix corresponds to a received vector version. The system and covariance matrices are extended and approximated as block circulant matrices. A diagonal matrix of each of the extended and approximated system and covariance matrices are determined by prime factor algorithm-fast Fourier transform (PFA-FFT)without division of the matrix. The received vector versions are extended. A product of the diagonal matrices and the extended received vector versions is taken. An inverse block discrete Fourier transform is performed by a PFA-FFT a on a result of the product to produce the estimated data.
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Inventors: Kwak; Jaeyoung (Morganville, NJ), Haim; John W. (Baldwin, NY), Zeira; Ariela (Huntington, NY), Pan; Jung-Lin (Smithtown, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 12/358,739
Filed: January 23, 2009
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
11926534 Oct., 2007 7483475
10644361 Oct., 2007 7289552
60404561 Aug., 2002
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Current U.S. Class: 375/340
Current International Class: H04L 27/06 (20060101)
Field of Search: 375/130,140,147,150,316,343,340,346,347,348 370/320,335,342,441 708/403,402,400,404,405,821,820
