پديد آورنده :
حجتيان، حامد
عنوان :
بررسي عملكرد سيستم هاي چند آنتني انبوه مبتني بر OFDM در حضور خطاي همزمان سازي
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر
صفحه شمار :
يازده، 87ص.: مصور، جدول، نمودار
يادداشت :
ص. ع. به فارسي و انگليسي
استاد راهنما :
محمد جواد اميدي
توصيفگر ها :
سيستم هاي چند آنتني انبوه مبتني بر OFDM , انحراف فركانسي حامل ها , تخمين انحراف فركانسي و كانال , سيگنال راهنما , همزمان سازي , تصحيح انحراف فركانسي , همسان سازي كانال
استاد داور :
علي محمد دوست حسيني، محمد صادق فاضل
تاريخ ورود اطلاعات :
1396/04/20
رشته تحصيلي :
برق و كامپيوتر
دانشكده :
مهندسي برق و كامپيوتر
چكيده انگليسي :
Performance Analysis of OFDM Based Massive MIMO Systems in Presence of Synchronization Error Hamed Hojatian Hamed Hojatian@ec iut ac ir 2017 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Prof Mohammad Javad Omidi omidi@cc iut ac ir Advisor Prof Hamid Saeidi saeedi@yazd ac ir Abstract In the recent decade multi carrier modulation is considered by wireless system designers due to its high data rate andresistance against multipath fading effects Orthogonal frequency division multiplexing OFDM is widely known and is themost commonly used multi carrier modulation scheme in many communication standards MIMO technology has been useddue to the increase of the request for higher data rate quality of transmission and transmission energy limitation Wirelesscellular communication system is one of the most popular application of multi user MIMO Thus by combining of MIMOand OFDM MIMO OFDM is introduced In the recent years many research work have been devoted to the proposal of newtechniques for the 5G cellular system Multi user MIMO with high number of antennas is widely considered and this hasbeen the first assumption of many researches Synchronization error is one of the most challenging problems in an OFDMsystem and carrier frequency offset is the reason for synchronization error CFO can degrade the system performance Therefore synchronization is one of the most important aspects of these communication systems Synchronization is donein two steps first estimation and second correction or compensation CFO estimation in multi user system uplink is achallenging task because the values of CFO for each user is different In this thesis CFO and channel estimation will beperformed jointly with low computational complexity by using CAZAC sequence which has attractive properties such asconstant amplitude and zero autocorrelation In addition by introducing an iterative scheme the performance of estimationis improved Then the performance of estimation is deliberated by CRLB calculation Also CFO compensation is done byintroducing a new algorithm for uplink This algorithm is improved by applying windowing and iterative schemes Finallythe simulation results will be shown the performance analysis Keywords Massive MIMO system based on OFDM Massive MIMO MIMO OFDM CFOestimation Channel estimation Intercarrier interference Carrier frequency offset Pilot CFOcompensation Channel equalization
استاد راهنما :
محمد جواد اميدي
استاد داور :
علي محمد دوست حسيني، محمد صادق فاضل
