Spread spectrum signal demodulation circuit

Details Spread spectrum signal demodulation circuit Spread spectrum signal demodulation circuit

1990-05-16

1991-07-09

Tarcza, Thomas H.

Pulse or digital communications

Repeaters

Testing

380 46, 375115, H04K 100

Patent

active

050311913

ABSTRACT:
A spread spectrum signal demodulation circuit includes a multiplier which multiplies an input spread spectrum signal by a demodulation PN code, and a demodulation PN code generator generates the demodulation PN code by utilizing an oscillation signal from a VCO as a clock signal thereof. An output of the multiplier is given to a bandpass filter and an output of which is integrated by an integration circuit. A first integrated value for a first time is compared with a second integrated value for a second time later than the first time and, in accordance with a comparison result, a frequency of the oscillation signal of the VCO is changed so that the demodulation PN code is synchronized with a modulation PN code included in the input spread spectrum signal.

REFERENCES:
patent: 4903279 (1990-02-01), Murikami et al.
patent: 4924188 (1990-05-01), Akazawa et al.
patent: 4943975 (1990-07-01), Kurihara et al.

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