Authors: Muhammad Khalil Afzal; Seung Yeob Nam; Byung-Seo Kim; Sung Won Kim
Addresses: Department of Computer Science, Comsats Institute of Information Technology, Wah 47040, Pakistan ' Department of Information and Communication Engineering, Yeungnam University, Gyeungsan, Gyeungbuk 38541, Korea ' Department of Computer and Information Communication Engineering, Hongik University, Sejong 30016, Korea ' Department of Information and Communication Engineering, Yeungnam University, Gyeungsan, Gyeungbuk 38541, Korea
Abstract: Cooperative communications aim to gain spatial diversity from stations cooperating during data transmission without requiring multiple transceiver antennas on the same station. However, performance from cooperative communications highly depends on the relay-selection method. This paper proposes and evaluates a distributed relay-selection method based on the signal-to-noise ratio of the communication links of candidate relay nodes. A node is selected as a relay node based on the signal-to-noise ratio of its communication link. Moreover, data might be delivered through a relay node that can support high transmission rate rather than through a direct link with a low transmission rate. This paper provides a detailed analysis of the collision probability in the proposed method as compared to a conventional random backoff method. Results demonstrate that the proposed relay-selection method reduces collision probability, and hence, enhances system throughput.
Keywords: cooperative communications; relay selection; collision.
International Journal of Ad Hoc and Ubiquitous Computing, 2018 Vol.28 No.1, pp.45 - 54
Received: 27 Apr 2015
Accepted: 25 Feb 2016
Published online: 08 May 2018 *