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In this paper, we consider relay-assisted simultaneous wireless informationand power transfer (SWIPT) for two-hop cooperative transmission, where ahalf-duplex multi-antenna relay adopts decode-and-forward (DF) relayingstrategy for information forwarding. The relay is assumed to be energy-free andneeds to harvest energy from the source node. By embedding power splitting (PS)at each relay antenna to coordinate the received energy and information, jointproblem of determining PS ratios and power allocation at the multi-antennarelay node is formulated to maximize the end-to-end achievable rate. We showthat the multi-antenna relay is equivalent to a virtual single-antenna relay insuch a SWIPT system, and the problem is optimally solved with closed-form. Toreduce the hardware cost of the PS scheme, we further propose the antennaclustering scheme, where the multiple antennas at the relay are partitionedinto two disjoint groups which are exclusively used for information decodingand energy harvesting, respectively. Optimal clustering algorithm is firstproposed but with exponential complexity. Then a greedy clustering algorithmsis introduced with linear complexity and approaching to the optimalperformance. Several valuable insights are provided via theoretical analysisand simulation results.

Joint resource allocation in SWIPT-based multi-antenna decode-and-forward relay networks