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Sum-Rate Optimal Power Policies for Energy Harvesting Transmitters in an Interference Channel  

Tutuncuoglu, Kaya (Wireless Communications and Networking Laboratory (WCAN), Electrical Engineering Department, Pennsylvania State University)
Yener, Aylin (Wireless Communications and Networking Laboratory (WCAN), Electrical Engineering Department, Pennsylvania State University)
Publication Information
Journal of Communications and Networks / v.14, no.2, 2012 , pp. 151-161 More about this Journal
Abstract
This paper considers a two-user Gaussian interference channel with energy harvesting transmitters. Different than conventional battery powered wireless nodes, energy harvesting transmitters have to adapt transmission to availability of energy at a particular instant. In this setting, the optimal power allocation problem to maximize the sum throughput with a given deadline is formulated. The convergence of the proposed iterative coordinate descent method for the problem is proved and the short-term throughput maximizing offline power allocation policy is found. Examples for interference regions with known sum capacities are given with directional water-filling interpretations. Next, stochastic data arrivals are addressed. Finally, online and/or distributed near-optimal policies are proposed. Performance of the proposed algorithms are demonstrated through simulations.
Keywords
Directional water-filling; energy harvesting networks; generalized iterative water-filling; interference channel; sum-throughput maximization;
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