4QAM-CDMA transmission over satellite mobile channels in the presence of nonlinear distortions and Rayleigh fading

This paper presents a theoretical analysis, for 4QAM code division multiple access (CDMA) system with nonlinear distortion, in terms of average bit error rate (BER) performance. The study considers slowly Rayleigh fading frequency selective satellite channel equipped with a nonlinear amplifier. In this investigation, a simple correlator-type receiver structure is considered. Here, the influence of the output back-off (OBO) of the nonlinear amplifier and the number of users in the system are investigated.