A new band AMC scheme for military use of indoor Mobile WiMAX system

Indoor wireless communication systems have been developed to improve cell coverage and throughput with low cost in indoor environment. Among several indoor wireless communication systems such as mobile WiMAX (worldwide interoperability for microwave access) system, WPAN (wireless personal area network) and WLAN (wireless local area network), the mobile WiMAX is one of the promising next-generation wireless communication systems and considered for military use by the U.S. Army. In indoor environment, a band AMC mode which is one of subchannel allocation modes in the mobile WiMAX system is mainly used since it is appropriate to the fixed or low mobility environments. However, the conventional band AMC mode is optimized for the outdoor environment, so it will cause many problems in the indoor environment. In this paper, we propose a new band AMC operation suited for the indoor environment. The proposed band AMC operation allocates the resource flexibly in indoor environment and it is compatible with the existing mobile WiMAX standard. The numerical analysis and simulation results show that a channel utilization of the proposed band AMC mode is higher than that of the conventional band AMC mode.