Chy., Deepak KumarKhaliluzzaman, Md.2022-07-032022-07-032015-02-0610.11648/j.wcmc.20150301.12, www.sciencepublishinggroup.com/j/wcmc)2330-10072330-1015http://dspace.iiuc.ac.bd:8080/xmlui/handle/123456789/3393Vol. 3, No. 1, 2015, pp. 7-12With the growing demand in modern communication, it has become necessary to give better and efficient service to users by using better technique. Technique such as Amplitude Shift Keying (ASK), Frequency Shift Keying (FSK), Phase Shift Keying (PSK), Differential Phase shift Keying (DPSK) and Quadrature Amplitude Modulation (QAM) are very important parts of the implementation of modern communications systems in which DPSK is the simplest and most robust of all techniques. In this paper, evaluation of SNR in terms of constant bit error rate is performed on AWGN, Rayleigh and Rician fading channels. Among these channels, Rician is showing better performance as compared to AWGN and RayleighenDPSKSNRBERAWGNRayleighRicianArticle