  This paper is a study of non-linear effects of RF Amplifiers on Communication
Systems Performance. High speed data communication is made possible by
Multilevel Modulation schemes. This paper presents a study of these non linear
effects on multilevel Modulation schemes like MPSK and MQAM. We make use of Bit
Error Ratio (BER) as performance measure. BER vs SNR (Signal-to-Noise Ratio)
curves provide comparison between the non linear effects caused by Gain
Compression in particular.
