Trading Wireless Information and Power Transfer: Relay Selection to Minimize the Outage Probability

TL;DR

This paper proposes relay selection schemes in wireless networks with energy harvesting relays to minimize outage probability by balancing information transfer and energy harvesting time.

Contribution

It introduces relay selection strategies considering causal and non-causal channel information to optimize outage probability in RF-powered relay networks.

Findings

Relay selection schemes effectively reduce outage probability.

Trade-off analysis between energy harvesting and information transfer.

Performance evaluated under different channel information scenarios.

Abstract

This paper studies the outage probability minimization problem for a multiple relay network with energy harvesting constraints. The relays are hybrid nodes used for simultaneous wireless information and power transfer from the source radio frequency (RF) signals. There is a trade-off associated with the amount of time a relay node is used for energy and information transfer. Large intervals of information transfer implies little time for energy harvesting from RF signals and thus, high probability of outage events. We propose relay selection schemes for a cooperative system with a fixed number of RF powered relays. We address both causal and non-causal channel state information cases at the relay--destination link and evaluate the trade-off associated with information/power transfer in the context of minimization of outage probability.