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In this paper, the authors investigate statistical properties of IP optimal subcarrier assignments in the down-link of an OFDMA cell. Essentially, they show that such subcarrier assignments do have "Hidden" statistical properties which can be exploited to design an extremely simple assignment strategy. They investigate such statistical properties and the corresponding performance of the simple assignment rules regarding a specific, well-known, NP-hard assignment problem. Although their approach is "Light-weight" in complexity, the strategy provides a significant performance gain compared to static assignments. Finally, they investigate their approach also for other optimization problems in the context of multi-user OFDMA assignments.
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