Effect of Noise on BER of BPSK, QPSK, DPSK, and QAM Modulation Techniques

This paper presents the theoretical background of digital modulation and evaluates the performance of BPSK, QPSK, and QAM modulation techniques with respect to Bit Error Rate in presence of Gaussian, Rayleigh, and Rician noise. The primary objective of any communication system is to receive the data with minimum errors as the errors degrades the system performance. Bit Error Rate (BER) is an important factor that decides the performance of different modulation techniques. This paper focusses on the effect of different types of noise for the above mentioned modulation schemes under AWGN channel. The complete system is implemented in MATLAB Simulink Environment. Keywords— BER, AWGN, Gaussian, Rayleigh, Rician, MATLAB Simulink.