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The performance of a mobile radio system based on OFDMA is determined by the type of mapping of logical sub-channels, which are allocated for data transmissions, onto the frequency channel. The mapping scheme affects the diversity both within and between the OFDMA sub-channels. This paper provides a performance comparison of different sub-channel mappings from MAC point of view by means of stochastic event-driven simulations. The tradeoff between the effects of mapping sub-channels onto distributed and adjacent subcarrier sets are investigated in detail. The effects are robust SNR estimation and possible throughput gains due to frequency adaptive scheduling, respectively.
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