Multi-phase and multi-amplitude level modulator and modulation a

Details Multi-phase and multi-amplitude level modulator and modulation a Multi-phase and multi-amplitude level modulator and modulation a

1975-02-28

1976-09-28

Griffin, Robert L.

Telegraphy

Systems

Printing

325 38A, 325163, 325320, 178 67, 332 17, 329135, H04L 2720

Patent

active

039834859

ABSTRACT:
A multi-phase, multi-amplitude level modulation method, and modulator, is provided which produces a three-level, ten-phase modulated carrier. The carrier is modulated in three amplitude levels, viz., off, intermediate and high and in ten phase positions, to produce sixteen signal states, one state corresponding to the carrier being off, five intermediate amplitude level states having five equally spaced phase positions, and ten high amplitude level states having ten equally spaced phase positions. A number of different four digit binary coding schemes for the sixteen signal states are disclosed together with other different coding and modulation techniques.

REFERENCES:
patent: 3369229 (1968-02-01), Dorros
patent: 3392238 (1968-07-01), Lender
patent: 3706945 (1972-12-01), Yanagidaira et al.
patent: 3753114 (1973-08-01), Burley
patent: 3806807 (1974-04-01), Nakamura
patent: 3887768 (1975-06-01), Forney et al.

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