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
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Electrotechnics, 1988. Conference Proceedings on Area Communication, EUROCON 88., 8th European Conference on
Date of Conference: 13-17 Jun 1988