Energy Harvesting Relaying

The relaying concept has been used in wired and wireless communications as a repeater or bridge for decades. For mobile relaying, reward mechanisms must be in place to encourage idle nodes to take part in relaying. This chapter examines several important issues in energy harvesting relaying, including interference and multi‐hop relaying. However, relay selection in energy harvesting relaying is slightly different from that in conventional relaying. There are different types of energy harvesting relaying. One can categorize them based on the relaying protocols: energy harvesting amplify‐and‐forward relaying; and energy harvesting decode‐and forward relaying. The chapter shows a diagram of the energy harvesting system where both source and relay harvest energy from the ambient environment. When the source and the relay harvest energy from a dedicated power transmitter, the optimization is performed for the achievable rate with respect to the time allocation and other relevant parameters.