naa a22 4500 510795862 CHVBK 20180411083336.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11277-011-0497-y doi (NATIONALLICENCE)springer-10.1007/s11277-011-0497-y Performance Analysis of Cognitive Radio Multiple-Access Channels Over Dynamic Fading Environments [Elektronische Daten] [Khalid Qaraqe, Sabit Ekin, Tarun Agarwal, Erchin Serpedin] In dynamically changing environments, the spectrum-sharing method is a promising method to address the spectrum underutilization problem for cognitive radio (CR) systems. This paper investigates the capacity of cognitive radio multiple-access channel (CR-MAC) over a dynamic fading environment. Multiple secondary users (SUs) transmit to the secondary base station under the transmit power (TP) and interference temperature (IT) at the primary base station constraints. In order to perform a general analysis, a theoretical dynamic fading model termed hyper-fading model, which is suitable to the dynamic nature of cognitive radio channel, is considered. The optimal power allocation method is employed to maximize the capacity of CR-MAC for hyper-fading channel with TP and IT constraints and full channel side information. Through the numerical simulations, the capacity of the hyper-fading channels are compared with that of other channel fading models such as Rayleigh, Nakagami-2, and with an additive white Gaussian noise channel. Additionally, the impacts of the number of SUs on capacity is investigated. Springer Science+Business Media, LLC., 2011 Cognitive radio nationallicence Capacity nationallicence Spectrum-sharing system nationallicence Hyper-fading nationallicence Dynamic fading nationallicence Mixture model nationallicence Multiple access channel nationallicence Qaraqe Khalid Department of Electrical and Computer Engineering, Texas A&M University at Qatar, Education City, Doha, Qatar aut Ekin Sabit Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA aut Agarwal Tarun Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA aut Serpedin Erchin Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA aut Wireless Personal Communications Springer US; http://www.springer-ny.com 68/3(2013-02-01), 1031-1045 0929-6212 68:3<1031 2013 68 11277 https://doi.org/10.1007/s11277-011-0497-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-011-0497-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Qaraqe Khalid Department of Electrical and Computer Engineering, Texas A&M University at Qatar, Education City, Doha, Qatar aut NATIONALLICENCE 700 1- Ekin Sabit Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA aut NATIONALLICENCE 700 1- Agarwal Tarun Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA aut NATIONALLICENCE 700 1- Serpedin Erchin Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX, USA aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 68/3(2013-02-01), 1031-1045 0929-6212 68:3<1031 2013 68 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer