Title :
Comparison of 16-ary DEQAM and 16-ary DEPSK signallings for spectrally efficient transmission over satellite links
Author :
Cheung, S.W. ; Aghvami, A.H.
Author_Institution :
Dept. of Electron. & Electr. Eng., King´´s Coll., London, UK
Abstract :
A comparative study is presented of a 16-ary differentially encoded quadrature-amplitude-modulation (DEQAM) and 16-ary differentially encoded phase-shift keying (DEPSK) transmission through a nonlinear satellite channel in the presence of additive white Gaussian noise (AWGN) and adjacent channel interference (ACI). It is assumed that the high-power amplifier of each earth station introduces both AM/AM and AM/PM conversion effects into the transmitted signals; the satellite transponder is assumed to be linear. the results show that in the presence of AWGN and ACI, 16-ary DEQAM systems outperform 16-ary DEPSK systems over nonlinear channels
Keywords :
amplitude modulation; phase shift keying; satellite relay systems; signalling (telecommunication networks); telecommunication channels; transponders; white noise; additive white Gaussian noise; adjacent channel interference; differentially encoded phase-shift keying; differentially encoded quadrature-amplitude-modulation; nonlinear satellite channel; satellite links; satellite transponder; spectrally efficient transmission; AWGN; Additive white noise; Band pass filters; Computer simulation; Phase modulation; Phase shift keying; Quadrature phase shift keying; Satellite broadcasting; Surface acoustic waves; Testing;
Conference_Titel :
Electrotechnics, 1988. Conference Proceedings on Area Communication, EUROCON 88., 8th European Conference on
Conference_Location :
Stockholm
DOI :
10.1109/EURCON.1988.11107
