Energy Efficiency Optimization for OFDM Based 5G Wireless Networks With Simultaneous Wireless Information and Power Transfer

In 5G wireless networks, the system capacity and the number of users will be significantly increased. However, the energy consumed for the communication will also be increased, which results in low system energy efficiency. Simultaneous wireless information and power transfer (SWIPT) can enable the...

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Bibliographic Details
Published in:IEEE access 2018, Vol.6, p.75937-75946
Main Authors: Lu, Weidang, Fang, Shanzhen, Hu, Su, Liu, Xin, Li, Bo, Na, Zhenyu, Gong, Yi
Format: Article
Language:English
Subjects:
5G mobile communication
Algorithms
Energy efficiency
Energy harvesting
Iterative methods
OFDM
Optimization
Orthogonal Frequency Division Multiplexing
Power transfer
Radio signals
Receivers
resource allocation
Resource management
Simultaneous wireless information and power transfer
Subcarriers
Wireless networks
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Summary:In 5G wireless networks, the system capacity and the number of users will be significantly increased. However, the energy consumed for the communication will also be increased, which results in low system energy efficiency. Simultaneous wireless information and power transfer (SWIPT) can enable the user to perform energy harvesting from the radio-frequency signals parallel with the information decoding, which can effectively improve the system energy efficiency. In this paper, we study the energy efficiency optimization problem for the orthogonal frequency-division multiplexing-based 5G wireless networks with SWIPT, in which the subcarrier and power allocation are jointly optimized to maximize the system energy efficiency for single user and multiple user cases. For those two cases, through mathematical transforming, we use the Dinkelbach iterative method and the Lagrange dual method to solve the non-convex energy efficiency optimization problem. Simulation results show that compared with other algorithms, our proposed algorithm can achieve higher energy efficiency.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2018.2883555