Title :
Performance evaluation of high level coded modulation over satellite channels
Author :
Fines, P. ; Aghvami, A.H.
Author_Institution :
Dept. of Electr. & Electron. Eng., King´´s Coll., London, UK
Abstract :
The performance of various coded and uncoded bandwidth efficient modulation schemes capable of providing bandwidth efficiency of 2 b/s/Hz over satellite links, is studied. The schemes are: Gray-coded 8-PSK (phase-shift keying), uncoded 8-AMPM, uncoded π/2 8-AMPM, trellis-coded modulation (TCM) 16-QAM (quadrature-amplitude modulation), π/4 TCM 16-QAM, and TCM 16-PSK, all bandlimited with roll-off factor α=0.5. The satellite high-power traveling wave tube amplifier (TWTA) is assumed to incorporate a soft-limiter-type linearizer in order to obtain the best possible bit error rate (BER) and minimum out of band emission (OBE). Performance, obtained by computer simulation, is expressed as the total carrier-to-noise (CNR) loss for a given BER, which is the sum of the CNR degradation due to the nonlinearities and high-power amplifier backoff. The performances of the various schemes are compared
Keywords :
amplitude modulation; phase modulation; phase shift keying; satellite relay systems; telecommunication channels; trellis codes; π/4 TCM 16-QAM; 16-QAM; BER; Gray-coded 8-PSK; TCM; TCM 16-PSK; TWTA; bandwidth efficiency; bit error rate; carrier-to-noise; coded modulation; computer simulation; high power amplifier; high-power amplifier backoff; nonlinearities; out of band emission; performance evaluation; phase-shift keying; quadrature-amplitude modulation; roll-off factor; satellite channels; satellite links; traveling wave tube amplifier; trellis-coded modulation; uncoded π/2 8-AMPM; uncoded 8-AMPM; Bandwidth; Bit error rate; Computer simulation; Degradation; High power amplifiers; Modulation coding; Performance loss; Phase modulation; Phase shift keying; Satellites;
Conference_Titel :
Global Telecommunications Conference, 1992. Conference Record., GLOBECOM '92. Communication for Global Users., IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-0608-2
DOI :
10.1109/GLOCOM.1992.276539
