Replies to post #294210 on InterDigital Inc (IDCC)

[Gamco]

United States Patent 7,778,232
Reznik , et al. August 17, 2010

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Multiuser detector for variable spreading factors


Abstract
A multiuser detector method and receiver that detects and decodes synchronous or asynchronous CDMA subchannels having different spreading factors with reduced computational complexity. The multiuser receiver is compatible with ZF-BLE, MMSE, decorrelating detectors and the like using Cholesky decomposition to minimize numeric operations. The receiver and method arranges the columns of system transmission response matrices representing the response characteristics of individual users into a total system transmission response matrix which represents a plurality of matched-filter responses for a given block of received data. The invention when used in conjunction with Cholesky decomposition reduces the number of required mathematic operations prior to parallel matched filtering.


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Inventors: Reznik; Alexander (Princeton, NJ), Lubecki; Timothy J. (Westfield, NJ), Zeira; Ariela (Huntington, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)

Appl. No.: 11/588,454
Filed: October 27, 2006

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Related U.S. Patent Documents

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Application Number Filing Date Patent Number Issue Date
10100997 Mar., 2002 7136369
PCT/US00/02621 Feb., 2000
60154985 Sep., 1999


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Current U.S. Class: 370/342 ; 370/441; 375/140
Current International Class: H04B 7/216 (20060101); H04J 1/16 (20060101)
Field of Search: 370/342,441,209 375/140