Apparatus and method of canceling periodic carrier phase jitter

Details Apparatus and method of canceling periodic carrier phase jitter Apparatus and method of canceling periodic carrier phase jitter

1991-10-11

1994-05-24

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375118, 329307, 329360, H03D 100, H04L 2706, H04L 700

Patent

active

053156188

ABSTRACT:
A received analog signal applied to a data modem receiver is sampled and converted into a digital signal which is demodulated into a complex baseband signal. If the demodulated complex baseband signal is deviated in phase from a QAM signal point due to phase jitter, the phase error is detected, and a replica of the phase jitter is calculated and applied to impart phase rotation for canceling out the phase jitter that is contained in the complex baseband signal. In each sampling cycle, the phase error between the phase-rotated signal and the modem output signal is detected in order to correct equations for calculating the replica of the phase jitter in the next sampling cycle.

REFERENCES:
patent: 4253184 (1981-02-01), Gitlin et al.
patent: 4370749 (1983-01-01), Levy et al.
patent: 4683578 (1987-07-01), Betts et al.
patent: 4689804 (1987-08-01), Srinivasagopalan
patent: 4707841 (1987-11-01), Yen et al.
patent: 4777640 (1988-10-01), Turner et al.
patent: 4847864 (1989-07-01), Cupo

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