Joint relay selection and power allocation for energy harvesting cooperative communication systems

In this paper, we consider optimal relay selection and power allocation strategy in EH cooperative communication systems, with different assumptions on the availability of CSI and ESI. With non-causal ESI/CSI. With non-causal ESI/CSI, we show that relay selection and power allocation can be formulated as a convex assignment problem and be solved by a branch-and-bound algorithm. With causal CSI/ESI, we formulate a online scheme which can serve as a performance lower bound, and propose a very simple and efficient solution. With causal CSI and non-causal/causal ESI, we formulate a dynamic programming problem and propose several very simple and efficient suboptimal solution. Simulation results show that the proposed joint optimal scheme can efficiently improve system performance with low complexity. Copyright © 2016 American Scientific Publishers All rights reserved.