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In this paper, we consider simultaneous wireless information and powertransfer (SWIPT) in multi-relay assisted two-hop relay system, where multiplerelay nodes simultaneously assist the transmission from source to destinationusing the concept of distributed space-time coding. Each relay applies powersplitting protocol to coordinate the received signal energy for informationdecoding and energy harvesting. The optimization problems of power splittingratios at the relays are formulated for both decode-and-forward (DF) andamplify-and-forward (AF) relaying protocols. Efficient algorithms are proposedto find the optimal solutions. Simulations verify the effectiveness of theproposed schemes.

Wireless Information and Power Transfer for Multi-Relay Assisted Cooperative Communication