PERFORMANCE ANALYSIS OF 49-QPRS THROUGH NONLINEAR SATELLITE CHANNELS IN THE PRESENCE OF GAUSSIAN NOISE AND COCHANNEL INTERFERENCE | ||||
| The International Conference on Electrical Engineering | ||||
| Article 48, Volume 1, 1st International Conference on Electrical Engineering ICEENG 1998, March 1998, Page 489-497 PDF (1.79 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/iceeng.1998.61107 | ||||
 View on SCiNiTO | ||||
| Author | ||||
| Mohamed Ibrahim M. Bdr1, 2 | ||||
| 1Dr. Eng., Egyptian Armed Forces.+ | ||||
| 2Author received the B.S from M.T.0 " Electrical Communication Engineering Department in 1975 ; the M.S. Degree from M.T.0 in 1985 and Ph.D. from Mansura University in 1996 - Egypt . | ||||
| Abstract | ||||
| This paper is concerned with the analytical performance analysis and evaluation of 49-ary Quadrature Partial Response Signaling when transmitted through nonlinear satellite channel in the presence of Additive White Gaussian Noise and Co-channel Interference ; in both uplink and downlink channels . The main source of the nonlinearities is the Traveling Wave Tube Amplifier on-board of the satellite. The transponder nonlinearities considered in this paper are due to : input amplitude -to-output amplitude conversion and input amplitude-to-output phase conversion . The cochannel interference results from interferers in the passband of the coherent ,receiver . The results in terms of the dependence of the average symbol error probability upon the uplink and downlink , signal-to-noise ratio's and Signal -to cochannel interference signal ratio's at different values of Back-Off from saturation operation of the Traveling Wave Tube Amplifier on-board of the satellite are illustrated . The results showed that the Back-Off value is the dominant factor in determining the system performance .The appropriate values of the threshold levels ; d"s and compensation phases ; θ's at the receiver are highly correlated and can only be arrived at by minimizing the average symbol error probability . | ||||
| Keywords | ||||
| Quadrature Partial Response Signaling , QPRS - Additive White Gaussian Noise; AWGN Co-channel Interference; CCI - Traveling 'Nave Tube Amplifier; TWTA - Input amplitude -to-output amplitude conversion; AM/AM -Input amplitude-to-output phase conversion; AM/PM -The average symbol error probability; P. - Signal-to-noise ratio's; pnu and pnd - Signal -to - cochannel interference signal ratio's , pun and pod - Back-Off from saturation operation of the TWTA , BO - Threshold levels; d". -compensation phases; θ"s at the receiver and Average symbol error probability; PE | ||||
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