Quadrature phase modulation receiver for spread spectrum...

Details Quadrature phase modulation receiver for spread spectrum... Quadrature phase modulation receiver for spread spectrum...

2005-04-19

2005-04-19

Tse, Young T. (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S141000, C375S267000, C375S329000, C375S376000

Reexamination Certificate

active

06882680

ABSTRACT:
A quadrature phase modulation receiver for a spread spectrum communications system includes a mixer for mixing a received spread spectrum signal with a heterodyne signal to convert the frequency of the received signal to an intermediate frequency. A regulated oscillators module is coupled to the receiver for producing the heterodyne signal and signal equal to the intermediate frequency signal. A frequency multiplier circuit is coupled to the mixer for receiving the intermediate frequency signal and multiplying the frequency of the signal by a predetermined multiplication factor. An oscillator control signal is produced based on the frequency multiplied signal to maintain synchronization between the receiver and the transmitter.

REFERENCES:
patent: 4829543 (1989-05-01), Borth et al.
patent: 5048057 (1991-09-01), Saleh et al.
patent: 5259007 (1993-11-01), Yamamoto
patent: RE35209 (1996-04-01), Partyka et al.
patent: 5537448 (1996-07-01), Schwarz et al.

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