naa a22 4500 510791387 CHVBK 20180411083321.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11277-012-0832-y doi (NATIONALLICENCE)springer-10.1007/s11277-012-0832-y Ergodic Sum Rate Maximization for Underlay Spectrum Sharing with Heterogeneous Traffic [Elektronische Daten] [Mina Dashti, Paeiz Azmi, Keivan Navaie, S. Razavizadeh] A radio resource allocation framework is proposed for underlay spectrum sharing. The ergodic capacity maximization problem in orthogonal frequency division multiple access-based network on point to multi point transmission is formulated and solved. Heterogeneous traffic is also considered in which two types of traffic is assumed: streaming traffic which has strict delay requirements, and elastic traffic with flexible delay requirements. Considering the effect of channel state information (CSI) imperfection in the evaluation of the secondary users' expected rate, we further assume that the estimated CSI between the secondary users and secondary base station (secondary channel) is not perfect. Moreover three different cases are considered depending on the availability of the CSI between the secondary base station and the primary receivers (interference channel). Using simulations, we evaluate the impact of streaming traffic and imperfect CSI on the sum capacity of the secondary elastic users for different values of parameter systems. Springer Science+Business Media, LLC., 2012 Elastic traffic nationallicence Streaming traffic nationallicence Resource allocation nationallicence Underlay spectrum sharing nationallicence Cognitive radio nationallicence Dashti Mina Department of Electrical Engineering, East Tehran Branch, Islamic Azad University, Tehran, Iran aut Azmi Paeiz Electrical and Computer Engineering Department, Tarbiat Modares University, Tehran, Iran aut Navaie Keivan School of Electronic and Electrical Engineering, University of Leeds, Leeds, UK aut Razavizadeh S. Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran aut Wireless Personal Communications Springer US; http://www.springer-ny.com 71/1(2013-07-01), 589-610 0929-6212 71:1<589 2013 71 11277 https://doi.org/10.1007/s11277-012-0832-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0832-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Dashti Mina Department of Electrical Engineering, East Tehran Branch, Islamic Azad University, Tehran, Iran aut NATIONALLICENCE 700 1- Azmi Paeiz Electrical and Computer Engineering Department, Tarbiat Modares University, Tehran, Iran aut NATIONALLICENCE 700 1- Navaie Keivan School of Electronic and Electrical Engineering, University of Leeds, Leeds, UK aut NATIONALLICENCE 700 1- Razavizadeh S. Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 71/1(2013-07-01), 589-610 0929-6212 71:1<589 2013 71 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer