Heterogeneous Power-Splitting Based Two-Way DF Relaying with Non-Linear Energy Harvesting

Abstract

Simultaneous wireless information and power transfer (SWIPT) has been recognized as a promising approach to improving the performance of energy constrained networks. In this paper, we investigate a SWIPT based three-step two-way decode-and-forward (DF) relay network with a non-linear energy harvester equipped at the relay. As most existing works require instantaneous channel state information (CSI) while CSI is not fully utilized when designing power splitting (PS) schemes, there exists an opportunity for enhancement by exploiting CSI for PS design. To this end, we propose a novel heterogeneous PS scheme, where the PS ratios are dynamically changed according to instantaneous channel gains. In particular, we derive the closed-form expressions of the optimal PS ratios to maximize the capacity of the investigated network and analyze the outage probability with the optimal dynamic PS ratios based on the non-linear energy harvesting (EH) model. The results provide valuable insights into the effect of various system parameters, such as transmit power of the source, source transmission rate, and source to relay distance on the performance of the investigated network. The results show that our proposed PS scheme outperforms the existing schemes.Index Terms-Simultaneous wireless information and power transfer, two-way decode-and-forward relay, dynamic heterogeneous power splitting, non-linear energy harvesting.

Impact of Artificial Noise on Security Capability of Energy Harvesting Overlay Networks

“…This paper mainly focuses on the linear energy harvesting (LEH) model in (2). Nonetheless, our analytical results are still extended to the nonlinear energy harvesting (NLEH) models (e.g., [32,33]). Indeed, for the NLEH models, P s in ( 3) is a nonlinear function of g ps .…”

Energy Efficiency Maximization for Energy Harvesting Bidirectional Cooperative Sensor Networks with AF Mode

“…Comparing with one-way relay systems, two-way relaying has been widely used in various EH networks owing to its high spectrum efficiency. Time division broadcast (TDBC) and multiple access broadcast (MABC) are two major two-way relay protocols, which can realize that two terminals exchange information through an EH intermediate relay [17][18][19][20][21][22][23][24][25][26]. For TDBC EH protocol, the total transmission process is divided into three unequal length slots, and the relay node can harvest energy from two sources in the first two time phases [17,18].…”

“…For TDBC EH protocol, the total transmission process is divided into three unequal length slots, and the relay node can harvest energy from two sources in the first two time phases [17,18]. In [19][20][21], energy efficiency and outage performance are optimized with DF relay mode. For the MABC EH protocol, the relay node can harvest energy from two sources in the same phases [22][23][24][25][26].…”

System Outage Performance for Three-Step Two-Way Energy Harvesting DF Relaying

“…In this paper, we consider a SWIPT enabled three-step DF TWRN in which both the PS scheme and the "harvest-thenforward" strategy are employed. Please note that, unlike the SWIPT enabled three-step two-way relaying in [21]- [26], our considered network can allocate time resources to relay and terminals in unequal portions for better delivery of information. Then we investigate the system outage performance for the considered network.…”