University of Oulu

E. E. Benítez Olivo, D. P. Moya Osorio, H. Alves, J. C. S. Santos Filho and M. Latva-aho, "An Adaptive Transmission Scheme for Cognitive Decode-and-Forward Relaying Networks: Half Duplex, Full Duplex, or No Cooperation," in IEEE Transactions on Wireless Communications, vol. 15, no. 8, pp. 5586-5602, Aug. 2016. doi: 10.1109/TWC.2016.2562109

An adaptive transmission scheme for cognitive decode-and-forward relaying networks : half duplex, full duplex, or no cooperation

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Author: Benítez Olivo, Edgar Eduardo1; Moya Osorio, Diana Pamela2; Alves, Hirley3;
Organizations: 1School of Telecommunications Engineering, São Paulo State University, São João da Boa Vista, Brazil
2Department of Electrical Engineering, Federal University of São Carlos, São Carlos, Brazil
3Centre for Wireless Communications, University of Oulu, Oulu, Finland
4Department of Communications, School of Electrical and Computer Engineering, University of Campinas, Campinas, Brazil
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.6 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2016
Publish Date: 2017-01-31


We propose an adaptive transmission scheme for cognitive decode-and-forward relaying networks, whereby, before each communication process, one out of three transmission modes is dynamically selected in order to maximize the instantaneous capacity of the system, namely, half-duplex (HD) relaying, full-duplex (FD) relaying, or direct transmission with no cooperation. The following key issues, relevant to underlay spectrum sharing and cooperative relaying, are considered: 1) the overall transmit power at the secondary network is constrained by both the maximum tolerable interference at the primary receiver and the maximum transmit power available at the secondary nodes; 2) under FD operation, the secondary relay is subject to residual self-interference, which is modeled as a fading channel; and 3) the signals coming from the secondary source and relay are handled at the secondary destination via maximal-ratio combining, in the HD relaying mode, and via a joint-decoding technique, in the FD relaying mode. We derive an exact analytical expression for the outage probability of the proposed scheme. Then, an approximate closed-form expression is proposed, and a corresponding asymptotic expression is derived. Monte Carlo simulations are run to validate the accuracy of the presented mathematical analysis and to showcase the tightness of the proposed approximation.

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Series: IEEE transactions on wireless communications
ISSN: 1536-1276
ISSN-E: 1558-2248
ISSN-L: 1536-1276
Volume: 15
Issue: 8
Pages: 5586 - 5602
DOI: 10.1109/TWC.2016.2562109
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported in part by the Brazilian Ministry of Educa- tion (CAPES), the Finnish Centre for International Mobility (CIMO), and the Tekes and Academy of Finland (AKA).
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