Journal
IEEE SIGNAL PROCESSING LETTERS
Volume 22, Issue 10, Pages 1728-1732Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LSP.2015.2428812
Keywords
Beamforming; dual-hop relaying; WPC
Categories
Funding
- National Key Basic Research Program of China [2012CB316104]
- National Natural Science Foundation of China [61201229]
- Zhejiang Science and Technology Department Public Project [2014C31051]
- Zhejiang Provincial Natural Science Foundation of China [LR15F010001]
- European Social Fund - ESF
- Greek national funds through the Operational Program Education and Lifelong Learning of the National Strategic Reference Framework (NSRF) - Research Funding Program: THALES-NTUA MIMOSA
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This letter maximizes the achievable throughput of a relay-assisted wirelessly powered communications system, where an energy constrained source, assisted by an energy constrained relay and both powered by a dedicated power beacon (PB), communicates with a destination. Considering the time splitting approach, the source and relay first harvest energy from the PB, which is equipped with multiple antennas, and then transmits the information to destination. Simple closed-form expressions are derived for the optimal PB energy beamforming vector and time split for energy harvesting and information transmission. Numerical results and simulations demonstrate the superior performance compared with some intuitive benchmark beamforming scheme. Also, it is found that placing the relay at the middle of the source-destination path is no longer optimal.
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