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This paper investigates a three-node amplify-and-forward (AF) multiple-inputmultiple-output (MIMO) relay network, where an autonomous relay harvests powerfrom the source information flow and is further helped by an energy flow in theform of a wireless power transfer (WPT) at the destination. Anenergy-flow-assisted two-phase relaying scheme is proposed, where a source andrelay joint optimization is formulated to maximize the rate. By diagonalizingthe channel, the problem is simplified to a power optimization, where a relaychannel pairing problem is solved by an ordering operation. The proposedalgorithm, which iteratively optimizes the relay and source power, is shown toconverge. Closed-form solutions can be obtained for the separate relay andsource optimizations. Besides, a two-phase relaying without energy flow is alsostudied. Simulation results show that the energy-flow-assisted scheme isbeneficial to the rate enhancement, if the transmit power of the energy flow isadequately larger than that of the information flow. Otherwise, the schemewithout energy flow would be preferable.

Joint Wireless Information and Power Transfer in a Three-Node Autonomous MIMO Relay Network