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Title: Energy-efficient cooperative transmission for simultaneous wireless information and power transfer in clustered wireless sensor networks
Authors: Guo, S
Wang, F
Yang, Y
Xiao, B 
Keywords: Power allocation
Cooperative relaying
Wireless information and power transfer
Clustered wireless sensor networks
Issue Date: 2015
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on communications, 2015, v. 63, no. 11, p. 4405-4417 How to cite?
Journal: IEEE transactions on communications 
Abstract: This paper considers applying simultaneous wireless information and power transfer (SWIPT) technique to cooperative clustered wireless sensor networks, where energy-constrained relay nodes harvest the ambient radio-frequency (RF) signal and use the harvested energy to forward the packets from sources to destinations. To this end, we first formulate the energy-efficient cooperative transmission (eCotrans) problem for SWIPT in clustered wireless sensor networks as a non-convex constrained optimization problem. Then, by exploiting fractional programming and dual decomposition, we develop a distributed iteration algorithm for power allocation, power splitting and relay selection to solve the non-convex optimization problem. We find that power splitting ratio plays an imperative role in relay selection. Our simulation results illustrate that the proposed algorithm can converge within a few iterations and the numerical analysis provides practical insights into the effect of various system parameters, such as the number of relay nodes, the inter-cluster distance and the maximum transmission power allowance, on energy efficiency and average harvested power.
ISSN: 0090-6778
EISSN: 1558-0857
DOI: 10.1109/TCOMM.2015.2478782
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