پديد آورنده :
جنتيان، نفيسه
عنوان :
طيف سنجي و تخصيص منابع در شبكه هاي راديو شناختگر
محل تحصيل :
اصفهان:دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر
صفحه شمار :
دوازده، 160ص.: مصور، جدول، نمودار
استاد راهنما :
محمود مدرس هاشمي
استاد مشاور :
علي محمد دوست حسيني
توصيفگر ها :
طيف سنجي همكارانه , تخصيص بهينه ي منابع , بهره وري انرژي
تاريخ نمايه سازي :
1394/04/16
استاد داور :
محمد جواد اميدي، فروغ السادات طباطبا، احسان يزديان
دانشكده :
مهندسي برق و كامپيوتر
كد ايرانداك :
ID759 دكتري
چكيده فارسي :
به فارسي و انگليسي
چكيده انگليسي :
Spectrum Sensing and Resource Allocation in Cognitive Radio Networks Nafiseh Janatian n janatian@ec iut ac ir Date of submission 12 3 2015 Department of Electrical and Computer Engineering Isfahan University of Technology 84156 83111 Isfahan Iran Supervisor Dr M Modarres Hashemi modarres@cc iut ac ir Advisor Dr A Doost Hosseini Department Graduate Program Coordinator Dr M Khosravifard Department of Electrical and Computer Engineering Isfahan University of Technology 84156 83111 Isfahan Iran Abstract One of the main requirements of cognitive radio CR systems is the ability to reliably detect the presence of li censed primary users After determining the availability of the licensed spectrum bands CR users must select appropriate transmission parameters to better utilize these bands and avoid possible interference to the licensed users This dissertation focuses on two main objectives First we address the temporal centralized cooperative spectrum sensing under correlated lognormal shadowing Formulating the spectrum sensing problem as a Gauss Gauss hypothesis test we derive the optimal detector under Bayesian criterion We calculate the upper and lower Bhattacharyya bounds and in this way we investigate the effect of the number of CR users and their correlation on the error performance of spectrum sensing Second we address the problem of joint sensing and resource al location with the goal of energy consumption minimization in code division multiple access CDMA based and orthogonal frequency division multiple access OFDMA based CR networks In addition we study the separate optimization problem in which the sensing parameters are determined regardless of the allocated resources The comparison between the joint and separate optimization shows more clearly the benefits of the joint optimization method for energy saving Key Words Cognitive Radio Cooperative spectrum sensing Resource Allocation Energy Efficiency Introduction The limited available spectrum and the inefficiency in the spectrum usage has led to the idea of dynamic spectrum access recentely One of the models for implementing this idea is the hierarchical model in which unlicensed secondary users SUs are allowed to utilize licensed spectrum bands as long as they do not cause unacceptable interference with the licensed pri mary users PUs Cognitive radio CR is the key technology that enables the network to use such a dynamic model CR is defined as an intelligent wireless communication system that is aware of its surrounding environment and is able to change its transmitter parameters based on interaction with the environment in which it operates There are three different operation models for CRs Underlay Overlay and Interweave In the underlay paradigm the secondary transmitter overlaps in frequency with the PU after making sure that its interference level is be low a given threshold The overlay paradigm uses the SU s knowledge of the PU s transmission scheme and the channel to choose a transmission scheme that causes an acceptable amount of interference In the interweave paradigm which is based on opportunistic spectrum access the
استاد راهنما :
محمود مدرس هاشمي
استاد مشاور :
علي محمد دوست حسيني
استاد داور :
محمد جواد اميدي، فروغ السادات طباطبا، احسان يزديان
