Title :
A Coherent Digital Amplitude and Phase Modulation Scheme
Author :
Campopiano, C.N. ; Glazer, B.G.
Author_Institution :
Aerospace Communications and Controls Div., Radio Corporation of America, Camden, NJ, USA
fDate :
3/1/1962 12:00:00 AM
Abstract :
In this paper, we present a technique for a combination of amplitude and phase modulation for digital communication. This technique assumes phase coherence between transmitter and receiver. For purposes of analysis, we also assume baud synchronization. The technique involves the simultaneous and independent amplitude modulation of two carriers of the same frequency which are in quadrature with each other. The demodulation process consists of the separation of the in-phase and quadrature components followed by amplitude detection. This scheme appears to be easier to implement than either the system studied by C. R. Cahn or the system investigated by J. C. Hancock and R. W. Lucky. Furthermore this system is comparable in reliability to the latter scheme.
Keywords :
Amplitude modulation; Coherence; Demodulation; Digital communication; Frequency; Phase modulation; Signal analysis; Signal to noise ratio; Terminology; Transmitters;
Journal_Title :
Communications Systems, IRE Transactions on
DOI :
10.1109/TCOM.1962.1088634