OFDM system performance with M-QAM under employment of generalized receiver

In our previous study we demonstrated that the employment of generalized receiver (GR) has superiority in comparison with implementation of the optimal receiver in the Neyman-Pearson sense in OFDM-BPSK wireless communication system. In this paper, we continue a discussion about the implementation of GR in OFDM wireless communication systems. We study the performance of OFDM wireless communication systems using the multilevel quadrature amplitude modulation (M-QAM) technique over the Rayleigh fading channel. We compare the performance of OFDM wireless communication systems with M-QAM technique employed the optimal receiver in the Neyman-Pearson sense and GR. Theoretical analysis and simulation demonstrate a superiority of GR implementation in OFDM wireless communication systems using M-QAM technique over the optimal receiver in the Neyman-Pearson sense.