Title: Network-coding-based hybrid-ARQ for bi-directional regenerative relaying

Authors: Xiaoye Shi; Jianhua Ge; Jing Li; Yancheng Ji

Addresses: State Key Laboratory of Integrated Service Networks, Xidian University, No. 2 Taibai South Road, Xi'an, Shaanxi 710071, China ' State Key Laboratory of Integrated Service Networks, Xidian University, No. 2 Taibai South Road, Xi'an, Shaanxi 710071, China ' State Key Laboratory of Integrated Service Networks, Xidian University, No. 2 Taibai South Road, Xi'an, Shaanxi 710071, China ' School of Electronics and Information, Nantong University, No. 19 Qixiu Road, Nantong, Jiangsu 226001, China

Abstract: Network coding is a promising technique to improve the throughput performance of wireless networks. In this paper, we propose a novel network-coding-based hybrid retransmission request protocol for two-way relaying system. The proposed protocol can retransmit more information in a given time interval by introducing network coding in the retransmission process, thus improving the throughput. Furthermore, we derive the frame error rate and delay performance using the L-ary pulse amplitude modulation by solving Markov state transition equations. Applying these results, the closed-form approximate solution of the throughput is acquired. Numerical results have validated our analytical results, and demonstrated that the proposed protocol outperforms the traditional hybrid retransmission request protocol for two-way relaying system by a throughput gain of about 9% when the relay lies close to the midpoint of the two users.

Keywords: relay communications; hybrid automatic repeat request; two-way relaying; network coding; frame error rate; FER; throughput performance; wireless networks; hybrid ARQ; automatic retransmission request; HARQ; delay performance.

DOI: 10.1504/IJES.2013.057083

International Journal of Embedded Systems, 2013 Vol.5 No.3, pp.150 - 157

Received: 09 Nov 2012
Accepted: 26 May 2013
Published online: 19 Jul 2014 *

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