Nonlinear Distortions Compensation of Amplitude Phase Shift Keying Signals with Different Orders in Communication Channels

This paper is dedicated to solving the task of linearization an amplified tract in order to reduce the nonlinear distortions level of amplitude phase shift keying signals with different orders. Wiener model was used as power amplifier (PA). Digital predistortion method based on a memory polynomial model was used as a linearization method. The studies were carried out in MATLAB/Simulink visual programming environment. Evaluation of the efficiency of the realized compensation algorithm was based on the following parameters: Adjacent Channel Power Ratio (ACPR), Error Vector Magnitude (EVM), Amplitude Modulation/Amplitude Modulation (AM/AM) and Amplitude Modulation/Phase Modulation (AM/PM) characteristics, Bit Error Rate (BER) dependence on bit signal-to-noise ratio (SNR). Thanks to the inclusion of Digital Predistorter (DPD) in the channel, we were able to achieve significant improvements in all parameters for each modulation case.