Pulse or digital communications – Repeaters – Testing
Patent
1990-10-26
1992-05-05
Gregory, Bernarr E.
Pulse or digital communications
Repeaters
Testing
380 34, 375 80, 375 94, 375106, H04L 2730
Patent
active
051114798
ABSTRACT:
A carrier sense circuit for sensing a carrier component of a received signal in a spread spectrum system includes a multiplier which produces a squared signal by multiplying the received signal by itself, a filter which extracts from the squared signal a carrier component of a spread spectrum signal included in the squared signal, and a detecting circuit which detects the level of the carrier component and which outputs a carrier sense signal when the level of the carrier component is greater than a predetermined level. The filter is a band pass filter having a central frequecny of 2f.sub.c where f.sub.c is the central frequency of the spread spectrum signal. Where the spread spectrum system includes an initial synchronization circuit, and a correlation arrangement which correlates the received signal with a reference signal to produce correlation pulses, a circuit can be provided to start the initial synchronization circuit in response to simultaneous occurrence of the carrier sense signal and one of the correlation pulses.
REFERENCES:
patent: 4626789 (1986-12-01), Nakata et al.
patent: 4943975 (1990-07-01), Kurihara et al.
Clarion Co. Ltd.
Gregory Bernarr E.
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