WIMAX uses OFDM to divide the available bandwidth into multiple narrowband subcarriers to combat multipath fading and intersymbol interference. It employs techniques like cyclic prefixing, coding and interleaving. Simulations show that frequency selective fading degrades performance more than flat fading, and that transmit diversity using two antennas improves performance over a single antenna. The WIMAX standard has been effectively implemented, but future work could analyze performance for different modulation modes to further evaluate its adaptability and scalability.