Low complexity multiuser detector

Details Low complexity multiuser detector Low complexity multiuser detector

2006-05-09

2006-05-09

Chin, Stephen (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S136000, C375S361000, C370S342000, C370S335000

Reexamination Certificate

active

07042926

ABSTRACT:
A multi-user detector for use in a CDMA receiver system includes a channel tap interpolator to generate interpolated channel taps for users of interest. The interpolated channel taps occur at integer multiples of a chip period from a sampling reference point. The channel tap interpolation allows detection processing to proceed in the chip domain, rather than in the sample domain, thus reducing the complexity of the multi-user solution significantly. In at least one approach, a number of low dimensionality “virtual” users are defined based on the recursive property of the spreading sequences. Solutions may then be developed for the virtual users using conventional detection (e.g., MMSE) techniques.

REFERENCES:
patent: 6034986 (2000-03-01), Yellin
patent: 6289041 (2001-09-01), Krasner
patent: 1117185 (2001-07-01), None
Multiple access interference resistant channel acquisition for wideband CDMA signals, Tripathi; Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st, vol.: 2, May 15-18, 2000 p. 956-960 vol. 2.
Ghauri, Irfan , et al., “Blind Channel Identification and Projection Receiver Determination For Multicode And Multirate Situations in DS-CDMA Systems”, 2001 IEEE, XP-002233922, 2197-2200.
Tripathi, Vinayak , et al., “Multiple Access Interference Resistant Channel Acquisition for Wideband CDMA Signals”, 2000 IEEE, 956-960.

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