On optimal relaying strategies for VANETs over double Nakagami- m fading channels
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On optimal relaying strategies for VANETs over double Nakagami-m fading channels Hassan Khayatian1 • Farzad Parvaresh1
•
Jamshid Abouei2 • S. Mohammad Saberali1
Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Vehicular ad hoc networks (VANETs) are able to facilitate data exchange among vehicles and provide diverse data services. The benefits of cooperative communications are such as to make it a proper idea to improve the achievable rate and diversity in VANETs. We investigate a dual-hop relay vehicular network with different transmit powers in vehicles on non-uniform shadowed double Nakagami-m fading channels in the presence of non-uniform co-channel interferers. In this paper, we investigate the diversity-multiplexing tradeoff (DMT) in such a network for three different schemes, namely, dynamic decode and forward (DDF), dynamic quantize map and forward and static quantize map and forward and prove that the DDF strategy has the optimal DMT. Also, the optimal listening and transmitting time of vehicles in various strategies as a function of the channel conditions in vehicles are determined. Finally, we extend our results to a general multi-hop relay vehicular network model with multiple half-duplex relay terminals and different average SNRs over links. Keywords Dynamic decode and forward Quantize map and forward Two-hop relay vehicular network Diversity-multiplexing tradeoff
1 Introduction In cooperative diversity, users relay signals for each other. This method is employed in various wireless networks like mobile ad hoc networks, cognitive radio and wireless sensor networks. Also, cooperative diversity is a practical technology for intervehicular communications in VANETs due to a lack of existing infrastructure [1]. To examine cooperative diversity methods, a powerful mathematical metric is used as diversity-multiplexing tradeoff (DMT). In & Farzad Parvaresh [email protected] Hassan Khayatian [email protected] Jamshid Abouei [email protected] S. Mohammad Saberali [email protected] 1
The Department of Electrical Engineering, University of Isfahan, Isfahan, Iran
2
The Department of Electrical Engineering, Yazd University, Yazd, Iran
fact, the DMT tool can demonstrate the conflict between the rate and the outage probability in exchanging information in these networks [2]. The vehicles share traffic information and path conditions and accidents among each other by VANETs. Intelligent transportation systems (ITSs) have employed the vehicle to vehicle (V2V) cooperative communication in VANETs to improve quality metrics in transportation systems [3]. Two benefits of reliability and data rate in VANETs can be obtained by utilizing relays with optimal relaying strategy [4]. Selecting optimal relaying strategy is one of challenge in wireless relay networks [5]. Among the various types of used schemes in the relay, amplify-and-forward (AF), nonorthogonal amplify-and-forward (NAF) and decodeand-forward (DF) are cons
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