Coherent spread spectrum receiving apparatus

Details Coherent spread spectrum receiving apparatus Coherent spread spectrum receiving apparatus

1982-05-19

1984-03-06

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 97, 375115, H04B 1200

Patent

active

044358229

ABSTRACT:
In a digital data acquisition system, there is provided a coherent direct sequence spread spectrum receiving system. The coherent receiving system comprises an independent carrier tracking loop and three independent branches for detecting and locking on to a received psuedonoise data signal. The psuedonoise data signal being transmitted is provided with a time slot or discrete time portion during which no data is modulated onto the carrier. The carrier signal which is not phase modulated with digital data is tracked by the tracking loop so that the absolute phase of the carrier is never lost. The psuedonoise data signals are now recoverable in a coherent direct sequence spread spectrum receiver without the requirement of absolute phase determination or non-coherent detection.

REFERENCES:
patent: 4048563 (1977-09-01), Osborne
patent: 4203071 (1980-05-01), Bowles et al.
patent: 4301537 (1981-11-01), Roos
patent: 4361891 (1982-11-01), Lobenstein et al.

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