Digital modem having a monitor for signal-to-noise ratio

Details Digital modem having a monitor for signal-to-noise ratio Digital modem having a monitor for signal-to-noise ratio

1983-06-30

1985-11-26

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 10, 328165, H03C 500

Patent

active

045557900

ABSTRACT:
The present invention pertains to a digital modem utilizing QAM-type modulation having a signal-to-noise monitor which utilizes some of the components of a standard modem without interfering with its normal operation. The monitor averages the absolute value of the difference between the signal received by the modem and the ideal signal as represented on a typical signal constellation. In order to minimize the effect of phase and amplitude errors the monitor only handles the innermost signals of the constellation and ignores all the other signals.

REFERENCES:
patent: 3693100 (1972-09-01), Brown et al.
patent: 3889108 (1975-06-01), Cantrell
patent: 3978407 (1976-08-01), Forney, Jr. et al.
patent: 4311963 (1982-01-01), Watanabe et al.
patent: 4447910 (1984-05-01), Smith et al.
patent: 4458355 (1984-07-01), Motley et al.

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