Pulse or digital communications – Repeaters – Testing
Patent
1997-02-25
1999-05-11
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375200, 375201, 375362, H04B15/00
Patent
active
059035935
ABSTRACT:
In a spread spectrum signal receiver, a frequency divider circuit divides the frequency of the output signal of a VCO having a phase synchronized with that of the output signal of first multiplier. A first spreading code generating circuit generates a spreading code in response to the output signal of the frequency divider circuit. A second spreading code generating circuit generates first through third spreading codes in response to the spreading code. A selection circuit selects one of the first through third spreading codes. A second multiplier despreads the spectrum using the spreading code output from the selection circuit. A correlation detector circuit detects correlation from the output signal of the second multiplier and a control signal generates a delay or advance control signal in response to the detected correlation. The frequency dividing ratio of the frequency divider circuit is switched according to the delay or advance control signal. The timing of generating a spreading code can be regulated by changing the frequency dividing ratio, and then the timing of the spreading code of the transmitter side and that of the receiver side coincide.
REFERENCES:
patent: 5140610 (1992-08-01), Holliday et al.
patent: 5241562 (1993-08-01), Partyka et al.
patent: 5301206 (1994-04-01), Ishigaki et al.
patent: 5420850 (1995-05-01), Umeda et al.
Ishiguro Kazuhisa
Takahashi Yoshiaki
Yoshida Hiroyasu
Chin Stephen
Liu Shuwang
Sanyo Electric Co,. Ltd.
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