PERFORMANCE ANALYSIS OF 16-ary-OFFSET QAM SIGNALS THROUGH SATELLITE NONLINEAR CHANNELS | ||
International Conference on Aerospace Sciences and Aviation Technology | ||
Article 46, Volume 2, A.S.A.T. CONFERENCE 21-23 April 1987 , CAIRO, April 1987, Pages 1083-1095 PDF (2.11 M) | ||
Document Type: Original Article | ||
DOI: 10.21608/asat.1987.26205 | ||
Authors | ||
R. H. EL ZANFALLY1; S. MAHROUS2; A. EL MOGAZY3; F. ELMANSY3; N. A. RASLAN1 | ||
1Elect. Eng. Dept., Military Technical College, Cairo, Egypt. | ||
2Computer & Electronics Dept., Ain - Shams Unversity, Cairo, Egypt. | ||
3Communication Dept., M.T.C. Cairo, Egypt. | ||
Abstract | ||
An expression is derived for numerical computation of the symbol error probability of 16-ary offset quadrature amplitude modulation with sinusoidal shaping (16-ary offset-QAM). The channel considered here is a nonlinear satellite channel with additive Gaussian noise (AGN) in both up-link and down-link. The main source of the nonlinear distortion in two-link satellite channels is the travelling wave tube (TWT) power amplifier on-board of the satellite. The transponder nonlinearity considered in this paper is of the band-pass type (BPNL), which introduces a nonlinear input-ampliutde to output-amplitude (AM-to-AM) distortion and nonlinear input-amplitude to output-phase (AM-to-PM) distortion . Finally, a comparative study of 16-ary QAM and 16-ary offset QAM with sinusoidal shaping is performed with the BPNL operated at various levels of back-off from saturation. | ||
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