Abstract
Algorithms for joint subcarrier pairing and power allocation are investigated in order to maximize the worst-case energy efficiency (EE) in dual-hop decode-and-forward (DF) relay networks in the presence of an active eavesdropper. Accordingly, we study the impact of number of subcarriers on the trade-off in performance between the EE and the spectrum efficiency (SE). The formulated EE optimization problem is the ratio of the secure SE over the entire power consumption in the network, subject to the constraints of total transmit power and subcarrier pairing. A near-optimal iterative algorithm is proposed to perform the subcarrier pairing and power allocation for achieving the maximum EE in the networks. Furthermore, a suboptimal algorithm is proposed with two-step resource allocation. By considering the subcarrier channel quality of the source-to-relay and relay-to-destination links, the subcarrier pairing is first performed, followed by an energy-efficient iterative power allocation scheme to maximize the EE. Numerical results validate the effectiveness and correctness of the proposed algorithms.
Highlights
The enormous growth of energy consumption in wireless communication networks has recently drawn significant attention from both academics and industry
Considering the aforementioned discussions, in this paper we jointly investigate both secure transmission and EE maximization issues for a dual-hop DF relay network, which consists of one source node, one destination node, and one relay node with an eavesdropper between the relay node and the destination node
We resort to the joint design of subcarrier pairing and power allocation to improve the EE of the DF relay network in the presence of an active eavesdropper
Summary
The enormous growth of energy consumption in wireless communication networks has recently drawn significant attention from both academics and industry. In this paper, through a joint optimization of the subcarrier pairing and transmit power allocation, we will maximize the EE of a dual-hop DF relay network in the presence of an eavesdropper. The authors in [9,10] studied the optimization problems for joint subcarrier pairing and power allocation with a total network power constraint or with individual power constraints for the source and the relay nodes. To overcome the interference problem, the authors in [10] performed a joint optimization of relay selection, power allocation, and subcarrier assignment In these existing works [7,8,9,10,11], the throughput maximization was the main design goal.
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