Multilevel modulator capable of producing a multilevel quadratur

Details Multilevel modulator capable of producing a multilevel quadratur Multilevel modulator capable of producing a multilevel quadratur

1986-11-20

1988-01-26

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 48, 375 39, H03C 500

Patent

active

047219289

ABSTRACT:
In a multilevel modulator for use in modulating a main data signal of n bits and a subdata signal of a single bit into a multilevel quadrature amplitude modulated signal, the main data and the subdata signals have a first bit rate f.sub.1 and a second bit rate f.sub.1 /m, respectively, where m is a positive integer which is not less than two. A converting circuit converts the main data signal according to the subdata signal into a binary intermediate signal. The binary intermediate signal is processed by a digital-to-analog converter and a modulator into the multilevel quadrature amplitude modulated signal having output signal points of (2.sup.n +.alpha.) where .alpha. represents an integer which is not less than zero and is not greater than 2.sup.n /m. A multilevel demodulator carries out an inverse operation to reproduce the modulated signal into the main data signal and the subdata signal.

REFERENCES:
patent: 4675619 (1987-06-01), Uchibori et al.

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