Joint Scheduling and Resource Allocation in the OFDMA Downlink: Utility Maximization Under Imperfect Channel-State Information

The authors consider the problem of simultaneous user-scheduling, power-allocation, and rate-selection in an Orthogonal Frequency Division Multiple Access (OFDMA) downlink, with the goal of maximizing expected sum-utility under a sum-power constraint. In doing so, they consider a family of generic goodput-based utilities that facilitate, e.g., throughput-based pricing, quality-of-service enforcement, and/or the treatment of practical Modulation-and-Coding Schemes (MCS). Since perfect knowledge of Channel State Information (CSI) may be difficult to maintain at the base-station, especially when the number of users and/or subchannels is large, they consider scheduling and resource allocation under imperfect CSI, where the channel state is described by a generic probability distribution.

Provided by: Institute of Electrical and Electronics Engineers Topic: Mobility Date Added: Nov 2011 Format: PDF

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