Method for cell search under effect of high clock offset

Details Method for cell search under effect of high clock offset Method for cell search under effect of high clock offset

2007-02-06

2007-02-06

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S149000

Reexamination Certificate

active

10318450

ABSTRACT:
The present invention discloses a cell search method for a CDMA system, using a three-stage cell search. The method comprises matching an incoming signal from the base station, wherein the frequency of the incoming signal having an uncertain range; over-sampling the incoming signal N times against a chip rate and outputting the N over-samples; down-sampling the incoming signal and outputting N over-samples to a first stage, a second stage and a third stage. The first stage further comprises selecting a first group of slot boundaries as a first group of candidates after pre-selection, and the first group of candidates transmitting to a deciding selection stage of the first stage and the second stage to be continuously processed. The cell search method of the present invention can be used to reduce the effect of clock offset on the performance of cell search and to accomplish fast cell search.

REFERENCES:
patent: 6038250 (2000-03-01), Shou et al.
patent: 6728203 (2004-04-01), Wang
patent: 6831929 (2004-12-01), Sriram et al.
patent: 6965586 (2005-11-01), Maruyama
Shenn, “Cell search for 3GPP W-CDMA/FDD with chip clock shift and non-ideal sampling” Vehicular Technology Conference, 2001. VTC 2001 Fall, IEEE VTS 54th vol. 4, Oct. 7-11, 2001, pp. 2369-2373 vol. 4.
Wang, “Cell search algorithms and optimization in W-CDMA”. Vehicular Technology Conference Proceedings, 2000, VTC 2000-Spring Tokyo. 2000 IEEE 51st vol. 1, May 15-18, 2000 pp. 81-86 vol. 1.
Wang, “Cell search in W-CDMA”, IEEE Journal on Selected Areas in Communications, vol. 18, Issue 8, Aug. 2000 pp. 1470-1482.

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