Article

A Survey on Cooperative Diversity for Wireless Networks

IEEE Communications Surveys &amp Tutorials (Impact Factor: 6.49). 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.

0 Followers
 · 
86 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: A key design issue in relay based cooperative wireless networks is the design of an appropriate metric for relay selection algorithms. In most cooperative protocols designed for IEEE 802.11 networks, the relay selection metric is based on reducing the transmission delay of relay links. The bandwidth efficiency provided by this metric is beneficial for applications communicating at high data rate, however not all applications will benefit from this simple approach. In this paper, a novel cooperative metric is proposed, which in addition to bandwidth, also considers link reliability and link stability, especially useful in mobile scenarios, and for time sensitive service applications. The proposed metric is applied to the well-known CoopMAC protocol. Simulation results indicate a strong correlation between network performance and proposed cooperative metric.
    2014 6th International Conference on New Technologies, Mobility and Security (NTMS); 03/2014
  • [Show abstract] [Hide abstract]
    ABSTRACT: In this paper, we consider a cooperative underlay cognitive radio network with K half-duplex decode-and-forward relays that are used by the source-destination pairs of both the primary network (PN) and secondary network (SN). The SN exploits buffers with size of L data elements at relays to store the incoming secondary information and retransmit it later. We propose a novel buffer-aided relay selection scheme with successive interference cancellation and optimal SN power allocation that allows to mitigate the mutual interference between PN and SN. Using extensive simulations, we investigate performance of the proposed scheme in terms of the secondary throughput and power expenditure. Our results show that the proposed policy manages the interference between PN and SN efficiently, minimizes secondary power consumption and achieves higher secondary throughput compared to the recently proposed policy.
    2014 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN); 04/2014
  • Source
    Wireless Networks 01/2015; DOI:10.1007/s11276-015-0904-5 · 1.06 Impact Factor

Full-text

Download
70 Downloads
Available from
Jun 17, 2014
Available from

Felipe Gomez Cuba