Method and apparatus for fast acquisition and multipath search i

Details Method and apparatus for fast acquisition and multipath search i Method and apparatus for fast acquisition and multipath search i

1997-08-01

2000-04-25

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375142, 708813, 708422, H04B 1500

Patent

active

060552646

ABSTRACT:
Early and on-time signals are generated from a received CDMA signal for each PN code phase being searched, and the early and on-time signals are each divided into a number of subdwells sequentially in time. A correlation is then performed for each PN code phase search, on subdwells of the early and on-time signals for that PN code phase in a staggered manner in time, by alternating the correlation between the early and on-time signals during each sequential subdwell correlation. A detection statistic for the PN code phase is then generated from the correlation result. In an embodiment of the invention, two PN code phases are searched simultaneously by staggering the subdwell correlations in an alternate fashion between the early and on-time signals, so that each PN code phase uses a different set of subdwell correlations. In an alternative embodiment, a single PN code phase is searched by alternating the correlation between the early and on-time signals during each sequential subdwell correlation.

REFERENCES:
patent: 5440597 (1995-08-01), Chung et al.
patent: 5491718 (1996-02-01), Gould et al.
patent: 5596571 (1997-01-01), Gould et al.
patent: 5642377 (1997-06-01), Chung et al.
patent: 5654980 (1997-08-01), Latva-aho et al.

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