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

Benítez Olivo, Edgar Eduardo; Moya Osorio, Diana Pamela; Alves, Hirley; Silveira Santos Filho, José Cândido; Latva-aho, Matti (2016-05-03)

 
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https://doi.org/10.1109/TWC.2016.2562109

Benítez Olivo, Edgar Eduardo
Moya Osorio, Diana Pamela
Alves, Hirley
Silveira Santos Filho, José Cândido
Latva-aho, Matti
Institute of Electrical and Electronics Engineers
03.05.2016

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

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(c) 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
https://rightsstatements.org/vocab/InC/1.0/
doi:https://doi.org/10.1109/TWC.2016.2562109
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https://urn.fi/URN:NBN:fi-fe201701311390
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Abstract

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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