Relay Selection for Simultaneous Information Transmission and Wireless Energy Transfer: A Tradeoff Perspective
In certain applications, relay terminals can be employed to simultaneously deliver information and energy to a designated receiver and a Radio Frequency (RF) energy harvester, respectively. In such scenarios, the relay that is preferable for information transmission does not necessarily coincide with the relay with the strongest channel to the energy harvester, since the corresponding channels fade independently. Relay selection thus entails a tradeoff between the efficiency of the information transfer to the receiver and the amount of energy transferred to the energy harvester. The study of this tradeoff is the subject on which this paper mainly focuses.