A comparative study of relaying schemes with decode-and-forward over Nakagami$-m$ fading channels

George C. Alexandropoulos, Agisilaos Papadogiannis, Paschalis Sofotasios

    Research output: Contribution to journalArticleScientificpeer-review

    25 Citations (Scopus)


    Although relaying can be very beneficial for wireless systems, understanding which relaying schemes can achieve specific performance objectives under realistic fading is crucial. In this paper we present a general framework for modeling and evaluating the performance of dual-hop decode-and-forward (DF) relaying schemes over independent and not necessarily identically distributed (INID) Nakagami-m fading channels. We obtain closed-form expressions for the statistics of the instantaneous output signal-to-noise ratio of repetitive transmission with selection diversity. Furthermore, we present a unified statistical overview of other three significant relaying schemes with DF, one based on repetitive transmission with maximal-ratio diversity and the other two based on relay selection (RS). To compare the considered schemes, we present closed-form and analytical expressions for the outage probability and the average symbol error probability under various modulation methods, respectively. Importantly, it is shown that when the channel state information for RS is perfect, RS-based schemes always outperform repetitive ones. Furthermore, when the direct link between the source and the destination nodes is sufficiently strong, relaying may not result in any gains, and it should be switched off.

    Original languageEnglish
    Article number560528
    JournalJournal of Computer Networks and Communications
    Publication statusPublished - 2011
    Publication typeA1 Journal article-refereed


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