Optimal Resource Allocation in OFDMA Downlink Systems With Imperfect CSI

Date Added: Feb 2011
Format: PDF

In this paper, the authors address the problem of joint scheduling and resource allocation in the downlink of an Orthogonal Frequency Division Multiple Access (OFDMA)-based wireless network when the per-user SNR is known only in distribution. In particular, they consider sum-utility maximization over user schedules, powers, and code rates, subject to an instantaneous sum-power constraint. They consider both a "Continuous" scenario where, during a time-slot, each OFDMA subchannel can be time-shared among multiple users and/or code rates, and a "Discrete" scenario where no time-sharing is allowed.