Multilevel modulator capable of producing a composite modulated

Details Multilevel modulator capable of producing a composite modulated Multilevel modulator capable of producing a composite modulated

1987-02-09

1988-06-14

Wan, Gene

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 16R, 332 17, 329 50, 329109, 329110, 329135, 375 39, H03C 300, H03K 710

Patent

active

047514787

ABSTRACT:
Responsive to a first and a second main data signal and a subdata signal, a multilevel modulator produces a composite modulated signal which comprises a quadrature amplitude modulated component modulated by the first and the second main data signals and represented by a radius on a phase plane and a phase modulated component modulated by the subdata signal are represented by a clockwise and a counterclockwise shift on the phase plane. A multilevel demodulator carries out an inverse operation to reproduce the composite modulated signal into first and second reproduced main data signal and a reproduced subdata signal.

REFERENCES:
patent: 4498050 (1985-02-01), Yoshida
patent: 4574246 (1986-03-01), Yoshida
patent: 4675619 (1987-06-01), Uchibori et al.

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