Synchronism acquisition method and apparatus for correlation dem

Details Synchronism acquisition method and apparatus for correlation dem Synchronism acquisition method and apparatus for correlation dem

1997-03-21

1999-11-30

Pham, Chi H.

Pulse or digital communications

Repeaters

Testing

375206, 375326, 370515, H04B 1500, H04K 100, H04L 2730

Patent

active

059955376

ABSTRACT:
A method for synchronism acquisition between a spread code sequence at a transmission side and a despread code sequence at a reception side in spread spectrum (SS) communication such as a direct sequence (DS). The method includes steps of (a) calculating correlation values for the despread code at different chip phases with successively displacing the chip phases of the despread code at intervals of 1/N chip over a full search range for the synchronism acquisition, N being an integer equal to or larger than 2, (b) selecting, as candidates, a plurality of chip phases which correspond to comparatively high values from among the correlation values, (c) adding, for each of the candidates, correlation values of chip phases adjacent the candidate to the correlation value of the candidate, and (d) determining one of the candidates which exhibits a highest result of addition as a chip phase having acquired synchronism.

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