Correlation and demodulation circuit for a receiver for signals modulated by a specific code
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United States of America Patent
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Apr 4, 2006
Grant Date -
Jun 20, 2002
app pub date -
Nov 28, 2001
filing date -
Dec 18, 2000
priority date (Note) -
Expired
status (Latency Note)
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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.
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