BER Performance Evaluation of Different Phase Shift Keying Modulation Schemes

Digital modulation technique plays an important role in transmission of signals from transmitter to receiver in all communication systems and the performance of digital modulation systems is of the most important key factors to achieve the best results of the communication process. The most important digital modulation schemes are binary and multilevel carrier digital modulations such as Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), Phase Shift Keying (PSK), Differential Phase shift Keying (DPSK) and Quadrature Amplitude Modulation (QAM), Quadrature Phase Shift Keying (QPSK), Offset Quadrature Phase Shift Keying (OQPSK) and Differential Quadrature Phase Shift Keying (DQPSK). These schemes of modulation are important parts of the implementation of modern communications systems. In this work, studying the principle of the QPSK, OQPSK and DQPSK modulation are presented and implemented using Matlab with SIMULINK.V.2017 to investigate and compare the performance of QPSK, OQPSK and DQPSK in terms of the Bit Error Rate (BER) over AWGN, Rayleigh and Rician fading channels.