Impact of Primary-User Interference on Multiuser Cognitive Relaying Networks

  • Diana Pamela Moya Osorio Department of Electrical Engineering, Center of Exact Sciences and Technology, Federal University of São Carlos (UFSCar) https://orcid.org/0000-0001-8858-9646
  • Edgar Eduardo Benitez Olivo São Paulo State University (UNESP), Campus of São João da Boa Vista http://orcid.org/0000-0002-2200-3101
  • Mateus Komono Tojeiro Department of Electrical Engineering, Center of Exact Sciences and Technology, Federal University of São Carlos (UFSCar)
  • Luis Filipe Vasconcelos Peres Department of Electrical and Computer Engineering, São Carlos School of Engineering, University of São Paulo (USP)
Keywords: amplify-and-forward relaying, cooperative diversity, interference, multiuser diversity, underlay spectrum sharing

Abstract

This paper investigates the impact of primary-user interference on the performance of a cognitive relaying network consisting of a source, an amplify-and-forward relay and multiple destinations. With the aim of exploiting multiuser diversity at the secondary network, two different destination-selection policies are considered, which are based on partial channel state information of the network, accounting for either the direct links or the relaying links. In the setup under investigation, the source's information signal is conveyed to the selected destination by both the direct link and the relaying link, after which a maximal-ratio combining of the signals coming from the source and relay is performed. In addition, we consider that the transmit power of the secondary nodes is constrained by key aspects of underlay spectrum sharing, i.e.,  the  interference temperature at the primary network and the maximum transmit power available at the source and relay. The system performance of the considered destination-selection schemes is analyzed in terms of the outage probability and compared to the optimal criterion. Monte Carlo simulations are provided to verify the attained analytical results.
Published
23-05-2018
How to Cite
Moya Osorio, D. P., Benitez Olivo, E. E., Komono Tojeiro, M., & Vasconcelos Peres, L. F. (2018). Impact of Primary-User Interference on Multiuser Cognitive Relaying Networks. Journal of Communication and Information Systems, 33(1). https://doi.org/10.14209/jcis.2018.14
Section
Regular Papers