Method and apparatus for demodulating multi-level QAM signal

Details Method and apparatus for demodulating multi-level QAM signal Method and apparatus for demodulating multi-level QAM signal

1998-08-12

2000-02-22

Mis, David

Demodulators

Phase shift keying or quadrature amplitude demodulator

329310, 375324, 375340, H03D 300, H04L 2738

Patent

active

060284757

ABSTRACT:
Disclosed is a demodulating apparatus for preventing a reduction in reliability of demodulated data even if a signal point of a multi-level QAM signal is detected, because of influence from fading or noises, in a position where such a signal is not normally existent. To this end, a modulated signal modulated by a multi-level QAM modulation system is orthogonally detected, and analog signals of I and Q channels placed in an orthogonal relationship with each other are outputted. By an identification device, the analog demodulated signals are digitized and then outputted as digital demodulated signals of I and Q channels. If a signal point outside a normal signal point arrangement is detected among the outputs, a digital demodulated signal within a normal signal point arrangement is substituted for the detected signal and then original code data is reproduced.

REFERENCES:
patent: 5509031 (1996-04-01), Johnson et al.

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