Coherent spread spectrum receiving apparatus
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United States of America Patent
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-
Mar 6, 1984
Grant Date -
N/A
app pub date -
May 19, 1982
filing date -
May 19, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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