Adaptive noise suppression for digital modems

Details Adaptive noise suppression for digital modems Adaptive noise suppression for digital modems

1985-03-08

1986-12-30

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

375103, 375118, H03D 104, H04B 110, H04L 700

Patent

active

046334858

ABSTRACT:
This invention provides a receiver for a QAM modem with a phase tracking loop for eliminating phase errors due to phase jitter and frequency offset. The instantaneous phase error of the received signal is monitored and if it is below a certain preselected value, indicating the presence of white noise, the gain of the phase tracking loop is reduced.

REFERENCES:
patent: 4320526 (1982-03-01), Gitlin
patent: 4514855 (1985-04-01), Lang et al.
patent: 4532640 (1985-07-01), Bremer et al.
patent: 4534036 (1985-08-01), Betts et al.

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