| Summary: | 碩士 === 國立東華大學 === 電機工程學系 === 96 === In recent years, Orthogonal Frequency Division Multiple Access (OFDMA) becomes one of the high speed data rate wireless communication systems, and is a multi-user technique derived from Orthogonal Frequency Division Multiplexing (OFDM). By different channel responses due to the propagation paths for every user, each user uses the proper modulation and allocation on sub-carriers to get higher transmission rate. Sub-carrier allocation and adaptive modulation techniques are subject to multi-user diversity and feedback channel state information. In this thesis, we propose a throughput-based sub-carrier allocation, and compare three referred algorithms with the proposed method to those without the proposed method, in different channel states. We propose two algorithms to compare with those algorithms, and the simulation results express that the proposed method achieves the better performance than that of the referred algorithms with the maximum data rate.
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