Chongqing Key Laboratory of Nonlinear Circuits and Intelligent Information Processing, Southwest University, Chongqing 400715, China
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This paper examines the outage performance of a wireless-powered relaying single-input, multiple-output system with non-linear energy harvesters over double cascaded Rayleigh fading channels. In particular, a source node with a single antenna transmits information to a destination node with multiple antennas through $N (N \ge 1)$ single-antenna wireless-powered relays. The destination node adopts maximal ratio combining in order to process the multiple signal copies. Each relay is conducted with a non-linear energy harvester, in which the harvested power is limited by a threshold. The relays employ power-splitting receivers to deal with the information receiving and energy harvesting, and broadcast the processed information using a decode-and-forward protocol. A $K$th-best relay in terms of outage probability (OP) is selected to assist with source-relay-destination transmission. An analytical expression is derived for the OP, and verified using Monte Carlo simulation results.
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