Abstract
Owing to its high spectrum efficiency (SE), two-way relaying has aroused tremendous research interests. In this paper, the spectrum-energy efficiency (SE-EE) trade-off in decode-and-forward (DF) two-way multi-relay networks is studied by considering non-ideal power amplifiers and non-negligible circuit. Firstly, we consider the scenario of several relay nodes. To achieve better performance, the relay node with the highest energy efficiency (EE) is selected as the optimal one. Secondly, we design the optimal power allocation method to allocate each node with the optimal transmission power to enhance EE and SE. Finally, we evaluate the performance of our method and additionally analyze how the change of relay nodes’ relative position influences the EE and SE. Simulation results show that: 1) the proposed method can achieve higher SE than optimal relay equal power allocation, random relay equal power allocation, and optimal power allocation only; 2) the proposed method can achieve higher EE than optimal relay equal power allocation, random relay equal power allocation, and optimal power allocation only; and 3) EE and SE increase at first and then decrease when relay nodes move from the middle of the source node and destination node to both ends.
Highlights
With the increase of energy consumption in wireless communication networks due to the proliferation of mobile devices in recent years, the research on green energy-saving communication has attracted much attention [1], [2]
SIMULATION RESULTS AND ANALYSIS we evaluate the performance of our proposed joint optimization method of relay selection and power allocation and compare it with several existing optimization methods consisting of optimal relay equal power allocation, random relay equal power allocation, and optimal power allocation only
Relay nodes for transmission are selected randomly in S − D link and D − S link, respectively
Summary
With the increase of energy consumption in wireless communication networks due to the proliferation of mobile devices in recent years, the research on green energy-saving communication has attracted much attention [1], [2]. In [7], an optimal power allocation scheme is studied to enhance EE of a DF full-duplex (FD) relay channel, considering the extra circuit power consumption. The maximization problem of the minimum EE in multi-user and multi-relay networks using DF and AF protocols is investigated by optimizing relay distribution and transmission power [26]. We propose the method of joint optimization of relay selection and power allocation in DF multi-relay networks, which achieves the trade-off between EE and SE. An optimal relay selection method is proposed to enhance EE in DF two-way multi-relay networks.
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