3b238e271973795cd62-7355 20250603230004178 funda:funda fundamentalJournals@gmail.com WEB-FORM International Journal of Fundamental Physical Sciences IJFPS 22318186 03 2011 1 1 Electrical and Electronic Department, American International University-Bangladesh (AIUB) Mohammed Safiqul Islam Gouri Rani Barai Electrical and Electronic Department, American International University-Bangladesh (AIUB) Atiq Mahmood Electrical and Electronic Department, American International University-Bangladesh (AIUB) This paper deals with the communication system that uses M-ary Phase-Shift-Keying (M-PSK) and M-ary Quadrature Amplitude Modulation (M-QAM) to transmit information using OFDM technique over Rayleigh communication channel. In terms of Symbol Error Rate (SER), the performance of different modulation schemes using OFDM techniques in Rayleigh channel is analyzed. For different types of modulation schemes (QPSK, 16-QAM, 16-PSK, 64-QAM, 64-PSK) gray coded bit mapping has been used with OFDM techniques. So, better performance is shown in different modulation scheme by using gray coded bit mapping. Here in this paper, it is our goal to show the way through which the SNR result varies between M-PSK and M-QAM. 03 2011 22 27 10.14331/ijfps.2011.330006 https://www.fundamentaljournals.com/index.php/ijfps/article/view/7