Validity decision circuit capable of correctly deciding validity

Details Validity decision circuit capable of correctly deciding validity Validity decision circuit capable of correctly deciding validity

1988-10-28

1989-08-22

Mis, David

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329109, 329135, H03D 318

Patent

active

048599565

ABSTRACT:
In a demodulator for demodulating a multilevel quadrature amplitude modulated signal specified by a plurality of output signal points arranged on an approximately octangular specific region into an in-phase baseband signal and a quadrature baseband signal and for converting the in-phase and the quadrature baseband signals into a demodulator output signal and an error signal, a validity decision circuit (40) is supplied with the in-phase and the quadrature baseband signals to decide that the error signal is valid when at least one reception signal point is outwardly of the approximately octangular specific region.

REFERENCES:
patent: 4757266 (1988-07-01), Yoshida et al.

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