Effect of amplifier non-linearity on the performance of CDMA communication systems in a Rayleigh fading environment
Jameel Syed · ResearchSpace (University of KwaZulu-Natal) · 2010
The effect of amplifier non-linearity on the performance of a CDMA communications system is investigated in the presence of Additive White Gaussian and Rayleigh fading channels.Amplifier models and characteristics are presented to facilitate expansion of the system performance models to other types of amplifiers.Linearisation techniques are investigated as a mechanism to improve performance and the results of a practical investigation of the pre-distortion method are presented.It is shown that the bit error rate performance of a CDMA downlink may be analytically evaluated in terms of a scale factor that depends on the amplifier type and back-off level.A systematic methodology is presented and verified by simulation.Simulation results show that the downlink system performance depends on the amplifier back-off level and the number of users.