Carrier and data recovery and demodulation system

Details Carrier and data recovery and demodulation system Carrier and data recovery and demodulation system

1989-02-15

1991-03-19

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

329306, 455214, H04L 2718

Patent

active

050017276

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.

REFERENCES:
patent: 3806815 (1974-04-01), Fletcher et al.
patent: 4317210 (1982-02-01), Dekker et al.
patent: 4361894 (1982-11-01), Kurihara et al.
patent: 4466108 (1984-08-01), Rhodes
patent: 4527278 (1985-07-01), Deconche et al.
patent: 4560941 (1985-12-01), Welles, II et al.
patent: 4577157 (1986-03-01), Reed
patent: 4591797 (1986-05-01), Tanimoto et al.
patent: 4794623 (1988-12-01), Levesque et al.

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