Simulation study of M-ARY QAM modulation techniques using Matlab/Simulink

Abstract

Recent theoretical studies of communication systems show much interest on high-level modulation, such as M-ary quadrature amplitude modulation (M-QAM), and most related works are based on the simulations. In this paper, a simulation model to study various M-ary QAM modulation techniques is proposed. The simulation model is implemented in Matlab/Simulink environment and BERTool in conjunction with the model is also used. Simulation for 64-QAM and 256-QAM modulation techniques is done. The effect of the phase noise on the constellation diagram for both M-QAMs is examined. The impact of changing the power of the input signal, phase noise and frequency offset on Bit Error Rate (BER) performance of 64-QAM and 256-QAM is also studied. The simulation results in terms of the constellation diagram and the BER curve under various conditions are presented and analyzed.