Constant amplitude carrier communications system

Details Constant amplitude carrier communications system Constant amplitude carrier communications system

1970-07-13

1978-09-05

Birmiel, Howard A.

325 40, 325 47, 325 65, 325142, H04K 100

Patent

active

041123689

ABSTRACT:
A communication system comprising one or more communication units (transceivers) in which the transmitter includes means for modulating the carrier wave in such manner that the carrier amplitude is not varied by signal information but nevertheless signal information content can be extracted by conventional amplitude-modulation detection at the receiver. The signal power spectrum is varied along the frequency axis due to angle or phase modulation. The main components of each unit includes a transceiver, antenna and a phase-reversal modulator-correlator module between the antenna and the transceiver. The modulator-correlator module is bidirectional in operation and therefore it further modulates a spectrum of any signals from the transceiver which are radiated from the antenna and likewise modulates the spectrum of any electromagnetic wave signals received by the antenna. The modulation performed in the receive mode is of such a form that the signal is transformed into conventional amplitude modulated carrier which can be demodulated by a normal narrow band receiver. The modulation performed at the receiver is a correlation process so that an intended receiver can be discretely addressed through a coding process.

REFERENCES:
patent: 3350644 (1967-10-01), McNair
patent: 3366882 (1968-01-01), Briley
patent: 3406343 (1968-10-01), Mehlman
patent: 3478268 (1969-11-01), Coviello
A.R.R.L., Radio Amateur's Handbook (31st ed. 1954), p. 101.

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