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Erschienen in:
2019 | OriginalPaper | Buchkapitel
Energy Efficiency Optimization Based SWIPT in OFDM Relaying Systems
verfasst von : Dan Huang, Weidang Lu, Mengshu Hou
Erschienen in: Artificial Intelligence for Communications and Networks
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Abstract
The rapid development of the information and communication industry has brought huge energy consumption, which also reduces the energy efficiency. In this article, we integrate the cooperative relaying technology into a SWIPT-OFDM system, and focus on the system energy efficiency maximization problem. More specifically, the relay node uses the DF protocol to forward information from the base station to the user. The objective function is to maximize the energy efficiency of the system, in which the system fixed circuit power consumption, target rate, and total system power limit are all considered. At first we derive a non-convex fractional expression, after a complex mathematical transformation, a new objective function is obtained, and then we propose an efficient policy to optimize the subcarrier and power allocation for obtaining the optimal energy efficiency. Simulation results show that the proposed algorithm can not only converge after several iterations, but also achieve higher energy efficiency.