Since the early days of electronics, as advances in technology was taking place, the boundaries of both local and global communication began eroding, resulting in a world that is smaller and hence more easily accessible for the sharing of knowledge and information .the pioneering work by Bell and Marconi formed the corner stone of the information age that exists today and pavel the way for the future of telecommunication. The paper deals with the implementation of physical layer simulation reference system for a mobile system for a satellite-based wireless modem. The design is targeted into three modules —the transmitter, the channel considering AWGN noise and Rician fading and a receiver module following Matched filter and Bayesian Demodulation technique for the receiver designing.