Received path timing detecting circuit at DS-CDMA system

Details Received path timing detecting circuit at DS-CDMA system Received path timing detecting circuit at DS-CDMA system

2006-11-28

2006-11-28

Burd, Kevin (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S343000

Reexamination Certificate

active

07142587

ABSTRACT:
A received path timing detecting circuit in a receiver used in a DS-CDMA system, which can detect received path timing in multi path propagation channels even under surroundings in which noise and interference electric power are very large, is provided. A received path timing detecting circuit calculates cross correlation coefficients {RN,M} between a received signal and a reference signal in a predetermined cycle, a differential detector obtains real parts of products of complex conjugate numbers of respective elements of the cross correlation coefficients {RN−1,M} calculated at the N−1st cycle (N is an integer) and respective elements of the cross correlation coefficients {RN,M} calculated at the Nth cycle, and outputs the real parts as differential detection cross correlation coefficients {PN,M}, an averager for averaging the differential detection cross correlation coefficients outputted from the differential detector by a predetermined time, and a peak detector that detects one or plural peak values from the averaged cross correlation coefficients {PAN,M} and outputs the detected one or plural peak values as the received path timing.

REFERENCES:
patent: 5060515 (1991-10-01), Kanda et al.
patent: 6490010 (2002-12-01), Shibuya et al.
patent: 2001/0005176 (2001-06-01), Hofmann
patent: 2003/0031195 (2003-02-01), Okawa et al.
patent: 8-181634 (1996-07-01), None
patent: 10-32523 (1998-02-01), None
patent: 2751959 (1998-02-01), None
patent: 10-256942 (1998-09-01), None
patent: 11-8568 (1999-01-01), None
patent: 11-17652 (1999-01-01), None
patent: 2911117 (1999-04-01), None
patent: 2000-78110 (2000-03-01), None
patent: 2000-269860 (2000-09-01), None
patent: 2001-168767 (2001-06-01), None
patent: WO9914914 (1999-03-01), None
patent: WO 99/59254 (1999-11-01), None
patent: WO0001099 (2000-01-01), None
patent: WO 00/36761 (2000-06-01), None
A. Viterbi, “Principles of Spread Spectrum Communication”, Addison-Wesley Wireless Communication Series, Apr. 1995, pp. 52-67.
3rdGeneration Partnership Project; Technical Specification Group Radio Access Network; “Spreading and Modulation”, 3G TS 25.213 Version 3.1.1, (Dec. 1999), pp. 1-27.

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