Article

A Survey on Cooperative Diversity for Wireless Networks

IEEE Communications Surveys & Tutorials (Impact Factor: 6.81). 01/2012; 14(99):1 - 14. DOI: 10.1109/SURV.2011.082611.00047
Source: IEEE Xplore

ABSTRACT

Diversity, i.e. transmitting multiple replicas of a signal, may mitigate fading in wireless networks. Among other diversity techniques, the space diversity of multi-antenna systems is particularly interesting since it can complement other forms of diversity. The recent cooperative diversity paradigm brings the advantages of multi-antenna space diversity to single antenna networked devices, which, through cooperation and antenna sharing, form virtual antenna arrays. However, cooperative diversity is a complex technique and research on this topic is still in its early stages. This paper aims at providing a general survey on the theoretical framework; and the physical and medium access control proposals in the literature.

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Available from: Felipe Gomez Cuba, Jun 17, 2014
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    • "Thus, the destination receives two messages with the equivalent source but through independent fading channels. By joining these signals with combination techniques like a MRC or EGC, the diversity gain can be obtained without using additional antennas, power or bandwidths, and thus cost-effective[4]. Our purpose is to quantify the advantages of using cooperative transmissions in expand the network lifetime of the energy-constrained wireless network [5]. "

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    • "Cooperative communication by exploiting spatial diversity through distributed neighbors, called relays, is emerging as one of the most promising paradigms to combat wireless fading in single-antenna networks. Among various relaying protocols for cooperative communication, the two most popular are amplify-and-forward (AnF) and decode-and-forward (DnF) [1]. In addition, a relay can operate in either halfduplex (HD) or full-duplex (FD) modes. "
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    ABSTRACT: This paper investigates single relay selection problem for secure communication in a cooperative system with multiple full-duplex decode-and-forward relays, in which an eavesdropper may overhear the source confidential message through relays' transmission. We propose an opportunistic relay selection scheme which selects the relay that maximizes the system secrecy capacity. We then evaluate performance of the proposed scheme in terms of secrecy outage probability. As a comparison, we also derive the secrecy outage probability of the conventional Max-Min relay selection scheme proposed for full-duplex relaying systems without the existence of eavesdroppers. We show that our proposed scheme outperforms the conventional counterpart. Our analytic derivations are also extensively verified by Monte-Carlo simulations.
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    • "Moreover, BS can also act as relays for the legacy network as well as for its own subscribed users. Cooperative diversity appeared as a way to combat the effects of the fading, by allowing a single antenna user to experience spatial diversity [5]. Such schemes perform even better when the relay operates in a FD fashion [6]. "
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    ABSTRACT: This work proposes an analytical framework to study how relay selection strategies perform in half- and full-duplex deployments by combining renewal theory and stochastic geometry. Specifically, we assume that the network nodes -- operating in either half- or full-duplex mode -- are scattered according to a two-dimensional homogeneous Poisson point process to compute the relay selection cost by using a semi-Markov process. Our results show: ($i$) fixed relay outperforms the reactive option in either cases, ($ii$) the performance of both reactive and fixed relay strategies depends on the self-interference attenuation in full-duplex scenarios, evincing when they outperform the half-duplex option, and ($iii$) the reactive relay selection suffers from selecting relays at hop basis, while the fixed relay selection benefits most from the full-duplex communication.
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