Outage Analysis and Optimization of SWIPT in Network-Coded Two-Way Relay Networks

Abstract

This paper investigates the outage performance of simultaneous wireless information and power transfer (SWIPT) in network-coded two-way relay systems, where a relay first harvests energy from the signals transmitted by two sources and then uses the harvested energy to forward the received information to the two sources. We consider two transmission protocols, power splitting two-way relay (PS-TWR) and time switching two-way relay (TS-TWR) protocols. We present two explicit expressions for the system outage probability of the two protocols and further derive approximate expressions for them in high and low SNR cases. To explore the system performance limits, two optimization problems are formulated to minimize the system outage probability. Since the problems are nonconvex and have no known solution methods, a genetic algorithm- (GA-) based algorithm is designed. Numerical and simulation results validate our theoretical analysis. It is shown that, by jointly optimizing the time assignment and SWIPT receiver parameters, a great performance gain can be achieved for both PS-TWR and TS-TWR. Moreover, the optimized PS-TWR always outperforms the optimized TS-TWR in terms of outage performance. Additionally, the effects of parameters including relay location and transmit powers are also discussed, which provide some insights for the SWIPT-enabled two-way relay networks.

Performance analysis of energy-harvesting-aware multi-relay networks in Nakagami-m fading

“…Outage probability, as one of the most commonly used performance metric in wireless cooperative system over the fading channel, has attracted considerable research interests in the past decades [15,16]. In [17], an opportunistic relaying with the AF strategy was presented and the outage probability was discussed under Rayleigh fading channels.…”

Outage probability of power splitting SWIPT two-way relay networks in Nakagami-m fading

“…Very recently, simultaneous wireless information and power transfer (SWIPT) has been an exciting new way *Correspondence: rfli@vip.sina.cn 1 College of Computer Science and Electronic Engineering and the Key Laboratory for Embedded and Network Computing, Hunan University, 410082 Changsha, People's Republic of China Full list of author information is available at the end of the article to provide stale energy to wireless communication where the receiver is able to harvest energy and decode information from the received signals [5][6][7][8][9][10][11]. In [5], the authors described the basic idea about the wireless information and power transfer from information theoretical perspective, and in [6], the authors proposed a general receiver architecture with separated information decoding and energy harvesting receiver for SWIPT for practical applications.…”

On the Use of Tunable Power Splitter for Simultaneous Wireless Information and Power Transfer Receivers

“…The idea of transmitting an energy and information signal simultaneously was proposed for the first time in [1], where the assumption that a (smart) receiver would be able to harvest energy and decode the information signal simultaneously was made. The assumption did not have practical applications because energy harvesting circuits did not have the capability of decoding an information signal; therefore, two core solutions, namely, time switching and power splitting, were proposed and studied in detail in the following years [2]. The main difference between time switching and power splitting is that with time switching, the receiver performs either energy harvesting (EH) or information decoding (ID) depending upon the precoder timeslot allocation.…”