QAM modulator/demodulator

Details QAM modulator/demodulator QAM modulator/demodulator

1988-04-04

1989-11-14

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

329304, 375 39, 375 67, 375 86, H04L 2720, H04L 2722

Patent

active

048810495

ABSTRACT:
A digital signal transmission system adopting a quadrature amplitude modulation and demodulation principle and feasible for large capacity data transmission in which a number of levels are used. Each of a modulating and a demodulating device of the system is constructed to shift the phase difference between two carrier waves by a suitable angle of .DELTA..theta. radian from .pi./2 radian. The tuning phase in the demodulating device is limited to one so as to allow a bit error rate characteristic to remain constant.

REFERENCES:
patent: 4549142 (1985-10-01), Yoshida
patent: 4571549 (1986-02-01), Lods et al.
patent: 4665532 (1987-05-01), Fukuda et al.

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