Digital modulating/demodulating apparatus and a digital demodula

Details Digital modulating/demodulating apparatus and a digital demodula Digital modulating/demodulating apparatus and a digital demodula

1994-06-02

1996-07-09

Chin, Stephen

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

375340, H04L 512

Patent

active

055352448

ABSTRACT:
A digital modulating/demodulating apparatus includes a demodulator for demodulating a modulated signal into a demodulated positional signal in response to a receipt of the modulated signal, a decoder for decoding the demodulated positional signal into a digital signal of N bits. A previous signal point on the constellation plane is defined by a previous demodulated positional signal and a current signal point on the constellation plane is defined by a current demodulated positional signal. The decoder outputs a digital signal of N bits, based on en amplitude and a phase of the previous signal point and the amplitude and the phase of the current signal point.

REFERENCES:
patent: 4346472 (1982-08-01), Ohkoshi
patent: 4489418 (1984-12-01), Mazo
patent: 4771438 (1988-09-01), Nash
patent: 5258987 (1993-11-01), Wei
Proakis, "Digital Communications," Second Edition, 1989, pp. 265-272 and 304-322.

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