Coherent spread spectrum pseudonoise tracking loop

Details Coherent spread spectrum pseudonoise tracking loop Coherent spread spectrum pseudonoise tracking loop

1983-05-05

1985-08-27

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

329 50, 329122, 375 96, H03D 122

Patent

active

045382808

ABSTRACT:
A detector (20) is provided for use in a communication receiver where a received spread spectrum data signal is detected using a locally generated reference signal to decode the data signal. The detector (20) includes first (22) and second channels (24) and circuitry (90) for applying the received encoded data signal to the first (22) and second channels (24). A local generator (50) is provided for generating the reference signal wherein the reference signal has polarity transitions. A demodulator (40) is included in the first channel (22) for generating a detected recovered data signal from the received data signal in response to the reference signal. Circuitry (52) is provided for detecting the polarity transitions in the reference signal and for generating a differential PN signal. Circuitry (42) is further provided in the second channel (24) for correlating the received data signal and the differential PN signal to thereby generate a recovered error signal. The recovered data signal and the recovered error signal are correlated by circuitry (58) to generate a control signal for application to the local generator (50) for locking the reference signal to a component of the received data signal.

REFERENCES:
patent: 4313205 (1982-01-01), Rhodes
patent: 4351064 (1982-09-01), Ewanus
patent: 4470145 (1984-09-01), Williams

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