Carrier and data recovery and demodulation system
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United States of America Patent
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-
Mar 19, 1991
Grant Date -
N/A
app pub date -
Feb 15, 1989
filing date -
Feb 15, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A modulated carrier is received on a node (10) and then the I- and the Q-channels extracted with a local carrier clock (16) that is free-running relative to the modulated carrier. The I- and the Q-channels are then input to a digital signal processor (26) wherein a composite phase signal is generated representing the phase difference between the modulated carrier and the local carrier clock (16). The composite phase is output from a look-up table in an EPROM (30) and then the free-running phase the local carrier clock (16) and the modulated carrier is discriminated from the composite phase. The free-running phase is then subtracted from the composite phase to yield the phase modulation on the carrier.
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