The experienced growth in the use of digital networks has led to the need for the design of new communication networks with higher capacity. Worldwide interoperability for Microwave Access known as WiMAX is a wireless networking standard which aims for addressing interoperability across IEEE1 802.16 standard-based products. The message is to be transmitted through WiMAX system. Since interference and noise occurred in communication channel degrade the performance of any communication system. In this paper, the authors represent the Simulink model of WIMAX system. It consists of transmitter, channel and receiver.