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One of the 4G broadband wireless access technologies that managed to impose, is mobile WiMAX (Worldwide Interoperability for Microwave Access) a technology developed according to the specifications of the IEEE 802.16 standard. It aims to deliver high data rates over wide areas, even in the case when the transmission takes place at vehicular speeds of up to 125 km/h. The current paper proposes to provide an optimum link adaptation of a fully compliant mobile WiMAX system operating at 2.3 GHz in a vehicular multipath fading channel (ITU-R M.1225 Veh.A). The evaluation of the system's performance was done starting from the quality of service (QoS) requirements imposed by certain types of applications. The results are expressed in terms of the most suited coding scheme, the achievable link throughput and operating range, the required receiver sensitivity as well as the adaptive modulation switching points.