Utility Maximization Over Ergodic Capacity Regions of Fading OFDMA Broadcast Channels

This paper considers the jointly optimal rate and power allocation that maximizes a utility function of average rates in fading OFDMA broadcast channels. Derived under the assumption that superposition coding is allowed per subcarrier, the proposed low-complexity (yet capacity-achieving) resource allocation scheme can yield higher achievable rates than the existing approaches based on exclusive subcarrier assignment. In addition, relying on the stochastic optimization tools, the authors develop a class of stochastic gradient iterations that are capable of converging to the optimal benchmarks without the knowledge of fading channel statistics a priori.

Provided by: Institute of Electrical & Electronic Engineers Topic: Mobility Date Added: Aug 2012 Format: PDF

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