Title: Joint relay selection and power allocation protocol for two-way relaying system

Authors: Hui Zhi; Jun Zhu; Yanjun Hu

Addresses: Key Lab of Intelligent Computing and Signal Processing (Ministry of Education), Anhui University, Hefei 230601, Anhui, China ' Key Lab of Intelligent Computing and Signal Processing (Ministry of Education), Anhui University, Hefei 230601, Anhui, China ' Key Lab of Intelligent Computing and Signal Processing (Ministry of Education), Anhui University, Hefei 230601, Anhui, China

Abstract: The Joint Relay Selection and Power Allocation (JRSPA) for Amplify-and-Forward (AF) relaying (JRSPA-AF) combines Power Allocation (PA) and Relay Selection (RS) very well in Two-Way Relaying (TWR) system. In order to explore the system performance of JRSPA-AF protocol, the outage probability and Diversity-Multiplexing Trade-off (DMT) of JRSPA-AF protocol are analysed. One upper bound, two lower bounds and approximate expressions of outage probability along with the DMT are derived. Based on this, the idea of JRSPA is introduced into Decode-and-Forward (DF) relaying TWR system, and the JRSPA-DF protocol is proposed. Moreover, the exact expressions of outage probability and DMT for JRSPA-DF are derived. Simulations are developed to validate the analytical results, the results show that the approximation outage probability of JRSPA-AF can be used well to evaluate system outage probability over the entire transmission SNR region, and the analysis results of outage probability of JRSPA-DF are consistent with its simulation results. In addition, the simulation results indicate that JRSPA-DF can achieve lower outage probability than JRSPA-AF and other protocols.

Keywords: joint relay selection and power allocation; two-way relaying; outage probability; diversity-multiplexing trade-off.

DOI: 10.1504/IJWMC.2019.103112

International Journal of Wireless and Mobile Computing, 2019 Vol.17 No.4, pp.349 - 360

Accepted: 16 May 2019
Published online: 30 Sep 2019 *

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