Method of measuring quality of a signal received by a receiver o

Details Method of measuring quality of a signal received by a receiver o Method of measuring quality of a signal received by a receiver o

1983-10-04

1985-09-17

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 99, 375101, 375102, 455305, 328163, 328166, H04B 112

Patent

active

045425140

ABSTRACT:
A quality measure of a signal received at a receiver of a two-dimensional linear modulation data communication system, is measured by using a phase controlled baseband signal (y.sub.k.exp(j.phi..sub.k)) obtained from the received signal and a reproduced data signal (x.sub.k) derived from the phase controlled baseband signal. That portion of the quality measure which is introduced into the received signal in a transmission channel for the received signal, is measured by estimating a data signal component (y.sub.k) which includes intercode interference, by subtracting the data signal component from the phase controlled baseband signal to produce a difference signal of a phase difference relative to the reproduced data signal, by giving the phase difference to the difference signal to produce a phase adjusted signal, and by calculating a mean square of an inphase component of the phase adjusted signal. Portions of the quality measure which are related to a carrier phase jitter component and a carrier frequency offset component, are measured also by the use of the phase controlled baseband signal and the reproduced data signal. It is possible to carry out the method by a signal processor.

REFERENCES:
patent: 3404229 (1968-10-01), Downey et al.
patent: 3753123 (1973-08-01), Carpenter et al.
patent: 3882540 (1975-05-01), Otteson
patent: 4106102 (1978-08-01), Desblache

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