Title :
A review of the use of 16-ary QAM transmission for future satellite communications systems
Author_Institution :
Dept. of Electron. & Electr. Eng., King´´s Coll., London Univ., UK
Abstract :
Presents a comparison between 16-ary differentially encoded QAM (16-ary DEQAM) and 16-ary differentially encoded PSK (16-ary DEPSK) signallings through a typical nonlinear satellite link in the presence of additive white Gaussian noise (AWGN) and adjacent channel interference (ACI). Then, the performance of 16-ary QAM transmission with various predistortion techniques is given. The effect of replacing travelling wave tube amplifiers (TWTA) with solid-state power amplifiers (SSPA) on the 16-ary DEQAM performance is next presented. Finally, the results of recently reported field tests for 16-ary QAM transmission over satellite links are given
Keywords :
amplitude modulation; microwave amplifiers; phase shift keying; satellite relay systems; solid-state microwave devices; 16-ary DEPSK; 16-ary DEQAM; 16-ary QAM transmission; 16-ary differentially encoded PSK; 16-ary differentially encoded QAM; AWGN; additive white Gaussian noise; adjacent channel interference; nonlinear satellite link; predistortion techniques; review; satellite communications systems; signallings; solid state power amplifiers; travelling wave tube amplifiers;
Conference_Titel :
Modems and Codecs for Satellite Communications, IEE Colloquium on
Conference_Location :
London
