Wireless networks evolved to be the most integral part of the present day communication, providing internet access with various devices over the entire world. Wireless communications mostly utilize the services of Wi-Fi and cellular communications. But a major snag with Wi-Fi is its mobility and with cellular communications is its limited connectivity. An emerging technology named WiMAX (Wireless interoperability for Microwave Access) can overcome these limitations and can provide high data rates to the mobile subscribers. WIMAX is given the IEEE standard 802.16. In this paper, the authors are concerned with the performance analysis of WIMAX system for various modulation schemes and it is implemented using Simulink.