Paper Info
Title
User-Centric Energy Efficiency Optimization for MISO Wireless Powered Communications
Abstract
We consider a multiple-input single-output wireless powered communication network (WPCN), where the single-antenna users harvest energy from a multi-antenna access point (AP) and then transmit information back to the AP. With multiple antennas, the AP can perform energy beamforming in the downlink and exploit multiplexing- or (receive) beamforming-gain in the uplink. We consider maximizing the sum of the users’ energy efficiencies (EEs) by jointly optimizing the energy beamforming of the AP, transmit powers of the users, and time allocation. We formulate EE maximization problems for both TDMA-based WPCN (T-WPCN) and SDMA-based WPCN (S-WPCN), which are non-convex because they have the sum-of-ratios objective functions. We optimally solve the former by reformulating it into an equivalent parametric problem, whose solution can be obtained by iteratively solving convex problems, while the latter is optimally solved by convexifying it using the so-called feasible set reduction scheme. We show that the T-WPCN outperforms S-WPCN when there is no minimum throughput requirement, while we can observe that the S-WPCN outperforms T-WPCN when minimum throughput requirement is high. The simulation results verify our theoretical findings and demonstrate the effectiveness of our proposed schemes.
Year
DOI
Venue
2019
10.1109/TWC.2018.2886015
IEEE Transactions on Wireless Communications
Keywords
Field
DocType
Array signal processing,MISO communication,Throughput,Wireless communication,Resource management,MIMO communication,Wireless sensor networks
Beamforming,Mathematical optimization,Wireless,Efficient energy use,Computer network,Feasible region,Throughput,Time division multiple access,Multiplexing,Mathematics,Telecommunications link
Journal
Volume
Issue
ISSN
18
2
1536-1276
Citations 
PageRank 
References 
1
0.35
0
Authors
2
Name
Order
Citations
PageRank
Hunwoo Lim111.02
Taewon Hwang239931.78