Pulse or digital communications – Repeaters – Testing
Patent
1995-12-27
1997-04-29
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375208, 375354, H04L 2730, H04L 700
Patent
active
056256418
ABSTRACT:
A synchronizer of a fast frequency hopping spread spectrum receiver includes a correlator and a peak detection circuit for detecting the peak of the output signal of the correlator and outputting a detection signal. A sampler has the output signal of the correlator pass therethrough when the detection signal is outputted from the synchronizer. A code discriminating circuit discriminates the code of the output signal of the sampler. M pieces of frequency synthesizers of the correlator output M pieces of sinusoidal wave signals having the same frequencies as the frequencies of M pieces of carriers, respectively. A delay line of the correlator includes a plurality of delay elements connected with one another in a cascade, and delays the input signal of the correlator by each delay element and converts the input signal into M pieces of parallel input signals having different delay time, respectively. Besides, the delay time of respective delay elements is defined as a chip period. Each of M pieces of multipliers of the correlator multiplies one of M pieces of parallel signals by one of M pieces of sinusoidal wave signals which has been made to correspond in advance to the one parallel signal. A detection circuit of the correlator detects the output signals of M pieces of multipliers, respectively. An adder of the correlator adds up the output signals of M pieces of detection circuits.
REFERENCES:
patent: 4435821 (1984-03-01), Ito et al.
patent: 5432814 (1995-07-01), Hasegawa
Chin Stephen
Matsushita Electric - Industrial Co., Ltd.
Phan Hai H.
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