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Worldwide Interoperability for Microwave Access (WiMAX) is an emerging broadband wireless technology that promises high-speed data services. Mobile WiMAX is a broadband wireless solution that enables convergence of mobile and fixed broadband networks through a common wide area broadband radio access technology and flexible network architecture. Mobile WiMAX is based on orthogonal frequency division multiplexing/ orthogonal frequency division multiplexing Access (OFDM/OFDMA) technology. It supports Adaptive Modulation and Coding in both downlink and uplink with variable packet size. This paper presents a new form of Adaptive Modulation (AM), which has the ability to enhance the data rate of Mobile WiMAX OFDMA system especially at low SNR values.
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