Correlation and demodulation circuit for a receiver for...

Details Correlation and demodulation circuit for a receiver for... Correlation and demodulation circuit for a receiver for...

2006-04-04

2006-04-04

Corrielus, Jean B. (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S142000, C375S224000

Reexamination Certificate

active

07023905

ABSTRACT:
The correlation and demodulation circuit (6) in particular for a pseudo-random code radio-frequency signal receiver (1) includes a correlation stage (7) connected to a microprocessor (12) in particular for configuring the correlation stage in normal operating mode or in test mode. In normal operation the stage receives intermediate signals (IF) corresponding to the radio-frequency signals shaped in means (3) for receiving the modulated signals from the receiver. The intermediate signals are correlated in a correlator control loop (8) of said correlation stage (7) with a replica of the first code supplied by a code generator (25). The code generator (25) is adapted via a microprocessor (12) to generate a replica of a pseudo-random code of shorter repetition length than the pseudo-random code of the radio-frequency signals. Intermediate test signals (IFtest) with a reduced pseudo-random code are supplied to the correlation stage (7) so as to perform a test representative of the correlation stage in closed loop operation more quickly than with conventional intermediate signals.

REFERENCES:
patent: 4100531 (1978-07-01), Kobayashi
patent: 4910525 (1990-03-01), Stulken
patent: 5093800 (1992-03-01), Ifune
patent: 5117232 (1992-05-01), Cantwell
patent: 6493378 (2002-12-01), Zhodzishsky et al.
patent: 2003/0040852 (2003-02-01), Green et al.

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