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In this paper, BPSK and GMSK communication system model using AWGN channel and different coding and decoding is analyzed. In the paper performance of BPSK using Convolutional coding and viterbi decoding is compared to GMSK uncoded and GMSK employing Reed Solomon coding. The simulation shows that GMSK using Reed Solomon encoding and decoding techniques gives improvement in BER performance than uncoded BPSK/GMSK System. Computer Aided Design Tool MATLAB is employed for the simulation.