Modeling and simulation of amplifier nonlinearities for single 8-ary PSK modulated signal input

The performance of band limited M-ary PSK communication systems is impacted by amplifier nonlinearities. It is critical to precisely model high-power amplifiers (HPAs) to ascertain the bit error rate (BER) performance of M-ary PSK communication systems, which are band limited. State-of-the-art simulation techniques can be employed to exactly ascertain intersymbol interference (ISI) and its degradation on the BER in a computationally efficient approach. Simulation results are demonstrated in this paper, in a parameterized form with the HPA back-off level varied over a range of several dB. The HPA input is composed of a single 8-ary PSK modulated signal employing raised cosine filter shaping to band limit the signal structure. The effect of the shaping factor used in raised cosine filtering is determined in detail. The results for the simulation encompass the spectral distortion outside the signal band and the probability of bit error. Eye diagrams, constellation figures, cross correlation plots, and timing diagrams are employed in illustrating the results