Downlink Scheduling and Resource Allocation for OFDM Systems
Huang, Jianwei and Subramanian, Vijay G. and Agrawal, Rajeev and Berry, Randall A. (2009) Downlink Scheduling and Resource Allocation for OFDM Systems. IEEE Transactions on Wireless Communications, 8 (1). pp. 288-296. ISSN 1536-1276
Abstract—We consider scheduling and resource allocation for the downlink of a cellular OFDM system, with various practical considerations including integer tone allocations, different subchannelization schemes, maximum SNR constraint per tone, and "self-noise" due to channel estimation errors and phase noise. During each time-slot a subset of users must be scheduled, and the available tones and transmission power must be allocated among them. Employing a gradient-based scheduling scheme presented in earlier papers reduces this to an optimization problem to be solved in each time-slot. Using a dual formulation, we give an optimal algorithm for this problem when multiple users can time-share each tone. We then give several low complexity heuristics that enforce integer tone allocations. Simulations are used to compare the performance of different algorithms.
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