Optimizing multi-user detection

a multi-user detection and optimization technology, applied in the field of wireless communication, can solve the problems of increasing system delay, wasting computation power, and delay in the received signal path, and achieve the effect of eliminating redundant calculations
US20060146763A1Inactive Publication Date: 2006-07-06INTERDIGITAL TECH CORP
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
INTERDIGITAL TECH CORP
Publication Date
2006-07-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

Multi-user detection (MUD) performance is optimized to eliminate redundant use of power during processing. An overbuilt A-matrix, i.e., a system response matrix, is provided. The overbuilt A-matrix uses all possible codes, e.g., all codes identified in a candidate code list (CCL) provided by blind code detection (BCD). The overbuilt A-matrix is passed to the MUD which extracts only those rows or columns required for codes that have actually been received, thus eliminating the need to recompute whitening matched filter (WMF) outputs that do not correspond to the actually received code.
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Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation of U.S. patent application Ser. No. 10 / 725,808 filed Dec. 2, 2003, which claims the benefit of U.S. Patent Application No. 60 / 452,162, filed Mar. 3, 2003, which are incorporated by reference as if fully set forth.FIELD OF INVENTION

[0002] This invention generally relates to wireless communications, and more particularly, to joint detection in such systems. BACKGROUND

[0003] Joint detectors, such as multi-user detectors (MUD), reduce the effect of multiple access interference, and hence increase the system capacity. A MUD cancels intra-cell interference and the system capacity is determined by the efficiency of the MUD algorithm and the intercell interference. In addition to capacity improvement, MUD alleviates the near / far problem typical to direct sequence—code division multiple access (DS-CDMA) systems.

[0004] Conventional MUD algorithms extract all codes from a system response matrix (i.e., the A-ma...

Claims

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