CDMA synchronous acquisition circuit

Details CDMA synchronous acquisition circuit CDMA synchronous acquisition circuit

1997-08-04

2000-05-16

Pham, Chi H.

Pulse or digital communications

Spread spectrum

Direct sequence

375142, 375150, H04L 2730

Patent

active

060646888

ABSTRACT:
A CDMA synchronous acquisition circuit for receiving a CDMA signal and performing synchronous acquisition on the CDMA signal, comprises a receiving unit for receiving a signal and decoding the received signal to a reception base band signal which is spread-modulated in a CDMA mode, a correlation circuit for calculating a correlation value for the received base band signal every timing within one chip of a spread code by a correlator, and means for detecting the maximum value of the correlation value to estimate the spread code generation timing of a spread-modulated transmission base band signal within a precision of one chip of the spread code, wherein the correlator includes offset removing means for removing a DC offset component due to unbalance of the code balance of the spread code.

REFERENCES:
patent: 4438530 (1984-03-01), Steinberger
patent: 5548244 (1996-08-01), Clewer
patent: 5640416 (1997-06-01), Chalmers
patent: 5748623 (1998-05-01), Sawahashi et al.
patent: 5862139 (1999-01-01), Yanagi
patent: 5982763 (1999-11-01), Sato

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