System for generation of multiple pointed QAM signal spaces by u

Details System for generation of multiple pointed QAM signal spaces by u System for generation of multiple pointed QAM signal spaces by u

1981-09-08

1984-08-07

Safourek, Benedict V.

Pulse or digital communications

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Testing

375 39, 375 42, 370 20, 370118, H03D 500

Patent

active

044647670

ABSTRACT:
A system for the generation of many-pointed QAM signal spaces by use of multiple, synchronous QAM transmitters is provided. Three individual relatively low BPS data rate transmitters have their outputs connected to different weighting multipliers. The outputs of the weighting multipliers in turn are connected to a summer which produces a composite signal. The input to the individual transmitters comprises a binary data input, the bits of which have been steered to individual ones of low BPS data rate transmitters. The composite output of the summer generates a signal space sufficient for 14,400 BPS transmission utilizing 4800 BPS transmitters.

REFERENCES:
patent: 2485886 (1949-10-01), Johnstone et al.
patent: 3261919 (1966-07-01), Aaron et al.
patent: 3378771 (1968-04-01), Gerwen et al.
patent: 3821481 (1974-06-01), Melvin
patent: 3955141 (1976-05-01), Lyon et al.
Digital Communications: Published by RCA Institutes, 1968, p. 1.7-Linear addition multiplexing.

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