Multiuser detector for variable spreading factors

Details Multiuser detector for variable spreading factors Multiuser detector for variable spreading factors

2006-11-14

2006-11-14

Pezzlo, John (Department: 2616)

Multiplex communications

Communication over free space

Combining or distributing information via code word channels...

C370S441000, C375S140000

Reexamination Certificate

active

07136369

ABSTRACT:
A multiuser detector that detects and decodes synchronous or asynchronous CDMA subchannels having different spreading factors with reduced computational complexity. The multiuser detector is compatible with ZF-BLE, MMSE, decorrelating detectors and the like using Cholesky decomposition to minimize numeric operations. The system 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 in conjunction with Cholesky decomposition reduces the number of required mathematic operations prior to parallel matched filtering.

REFERENCES:
patent: 6775260 (2004-08-01), Dabak et al.
patent: 2003/0043893 (2003-03-01), Jard et al.
A. Klein et al., “Zero Forcing and Minimum Mean-Square-Error Equalization for Multiuser Detection in Code-Division Multiple-Access Channels,” IEEE Transactions on Vehicular Technology, US, IEEE Inc. New York, vol. 45, No. 2, May 1, 1996 pp. 276-287.
H. R. Karimi et al., “A Novel and Efficient Solution to Block-Based Joint-Detection Using Approximate Cholesky Factorization,” IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, vol. 3, 1998, pp. 1340-1345.
J. Mayer et al., “Realtime Feasibility of Joint Detection CDMA,” EPMCC, European Personal Mobile Communications Conference Together with Kommunikation, vol. 145, No. 145, 1997, pp. 245-25.
M. Vollmer et al., “Comparative Study of Joint-Detection Techniques for TD-CDMA Based Mobile Radio Systems,” IEEE Journal On Selected Areas In Communications, vol. 19, No. 8, Aug. 2001, pp. 1461-1475.

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