Cooperative diversity for intervehicular communication: Performance analysis and optimization

Haci Ilhan*, Murat Uysal, Ibrahim Altunbaş

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

135 Citations (Scopus)


Although there has been a growing literature on cooperative diversity, the current literature is mainly limited to the Rayleigh fading channel model, which typically assumes a wireless communication scenario with a stationary base station antenna above rooftop level and a mobile station at street level. In this paper, we investigate cooperative diversity for intervehicular communication based on cascaded Nakagami fading. This channel model provides a realistic description of an intervehicular channel where two or more independent Nakagami fading processes are assumed to be generated by independent groups of scatterers around the two mobile terminals. We investigate the performance of amplify-and-forward relaying for an intervehicular cooperative scheme assisted by either a roadside access point or another vehicle that acts as a relay. Our diversity analysis reveals that the cooperative scheme is able to extract the full distributed spatial diversity. We further formulate a power-allocation problem for the considered scheme to optimize the power allocated to the broadcasting and relaying phases. Performance gains up to 3 dB are obtained through optimum power allocation, depending on the relay location.

Original languageEnglish
Pages (from-to)3301-3310
Number of pages10
JournalIEEE Transactions on Vehicular Technology
Issue number7
Publication statusPublished - 2009


Manuscript received May 5, 2008; revised November 5, 2008. First published February 6, 2009; current version published August 14, 2009. This paper was presented in part at the IEEE Vehicular Technology Conference (VTC-Spring) [24], Singapore, May 2008, and the IEEE Vehicular Technology Conference (VTC-Fall) [25], Calgary, AB, Canada, September 2008. The work of H. ˙lhan and ˙. Altunbas¸ was supported by the Scientific and Technological Research Council of Turkey under Project 107E022. The work of M. Uysal was supported in part by the Natural Sciences and Engineering Research Council under Collaborative Research and Development Grant CRDPJ348999-06. The review of this paper was coordinated by Prof. W. Su.

FundersFunder number
Natural Sciences and Engineering Research Council of CanadaCRDPJ348999-06
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu107E022


    • Cooperative diversity
    • Fading channels
    • Intervehicular communication
    • Relay-assisted transmission


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