Abstract
In this paper, we consider a three-point relay system, in which the relay has no fixed energy supplies and thus needs to replenish energy from RF signals transmitted by the source via wireless energy transfer (WET). We propose optimal selection relaying scheme when the source knows partial channel state information (CSI). To maximize the ergodic throughput under the peak/total power constraints of source and energy causality constraint of relay, the joint optimization of power control and information/energy transfer scheduling is formulated as a non-convex optimization of functional. By introducing new variables and constraints into the problem, the problem is solved by combining the fractional programming, convex optimization and linear search. Our results provide useful guidelines for the efficient design of relay systems with relay powered by WET.
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