Energy Efficient Precoding Design for SWIPT in MIMO Two-Way Relay Networks

Abstract

This paper deals with the energy efficiency (EE) maximization problem in multiple-input multiple-output (MIMO) two-way relay networks with simultaneous wireless information and power transfer (SWIPT). The network consists of a multiple-antenna amplify-and-forward relay node which provides bidirectional communications between two multiple-antenna transceiver nodes.In addition, one of the transceivers is considered battery limited and has the capability of energy harvesting from the received signals. Assuming the network EE as the objective function, we design power splitting factor and optimum precoding matrices at the relay node and two transceivers. The constraints are transmit power of the nodes, harvested energy and quality of service of two transceivers. The resulting non-convex optimization problem is divided into three sub-problems which are then solved via an alternation approach. In addition, sufficient conditions for optimality are derived and the computational complexity of the proposed algorithm is analyzed. Simulation results are provided to evaluate the performance and confirm the efficiency of the proposed scheme as well as its convergence.

Design and Optimization for Uav-enabled Two-way Relaying System With Swipt

“…3 − i is used to denote the desire signal of paired user. As stated in [23], the selfinterference term G i W R H i W i x i can be integrally canceled. Therefore, the received signal at UE i can be further obtained as…”

Energy-Efficient Joint Design of Fronthaul and Edge Links for Cache-Aided C-RAN Systems with Wireless Fronthaul

“…As illustrated in Section 1, our goal is to address the energy-efficient design for the described cache-aided C-RAN system with wireless fronthaul link. The EE metric, denoted by Θ, is defined as the data rate R that can be supported per unit power [31][32][33][34]. Mathematically, we write Θ as…”

“…Additionally, the two fronthauling strategies-the soft-and hard-transfer schemes-are compared in terms of EE.Entropy 2019, 21, 860 2 of 23 delivery phase for a fixed pre-fetching strategy and leave the joint design of co-operative caching and delivery strategies as an interesting future research direction.All of the techniques discussed above, such as C-RAN and edge caching, come at the cost of increased energy consumption [30,31], which causes increases both in the resulting carbon footprint and system costs. In order to address this issue, it is important to design systems by adopting energy efficiency (EE), instead of spectral efficiency, as the performance metric (as in, e.g., [28,[30][31][32][33][34]). The energy-efficient design of C-RAN systems with wired fronthaul links has been addressed in [31,34], and [28] extended such design to the case with edge caching and imperfect channel state information (CSI).…”

Energy Efficiency Maximization for SWIPT Enabled Two-Way DF Relaying

“…To the best of our knowledge, there has been no open work on the EE maximization for SWIPT enabled two-way DF relaying. In this paper, we focus on the EE maximization for SWIPT enabled two-way DF relay networks under a practical nonlinear EH model instead of the linear one adopted in [10]- [13]. The optimization problem is formulated by jointly optimizing the transmit powers for the two source nodes, the PS ratios at the relay, and the time used for the source-relay transmission.…”