Adaptive Method of Slot and Bit Allocation for OFDMA Transmission Systems

Abstract

This paper proposes the Orthogonal Frequency Division Multiple Access (OFDMA) transmission scheme with an adaptive slot and bit allocation method which can provide the broadband wireless LAN (WLAN) systems. From the fact that the radio links between different users and a base station experience the independent multi-path fading, this paper proposes a priority-based adaptive slot and bit allocation method in conjunction with an allocation adjustment method. The proposed method can achieve the higher efficient usage of frequency resource than those for the conventional fixed slot assignment with adaptive bit allocation method and the fixed bit assignment with adaptive slot allocation method. This paper presents various computer simulation results to evaluate the proposed method and demonstrates that the proposed method can achieve the higher frequency resource utilization with less computation complexity in the severe frequency selective multi-path fading channels.