14977

13481

كارشناسي ارشد

مخابرات سيستم

اصفهان : دانشگاه صنعتي اصفهان

1398

[دوازده]، 64ص.: مصور، جدول، نمودار

فروغ السادات طباطبا

علي محمد دوست حسيني

1398/06/05

كتابنامه

برق

مهندسي برق و كامپيوتر

1398/06/05

2553943

Performance Analysis of a Signal Alignment based NOMA System in Presence of Channel Estimation Errors Mohammad Ahmadian mohammad ahmadian@ec iut ac ir Month June 2019 Department of Electrical and Computer Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Assist Prof Foroogh S Tabataba fstabataba@cc iut ac ir Abstract Boost in number of wireless sensors which do not need high data rate alongside ever increasing traffic demand of theusers made a heterogeneity in network demands that is hard to fulfill by existing cellular telecommunication systems Additionally efficient usage of the system resources is another important issue of the next generation of networks Due tothe unique features of non orthogonal multiple access NOMA systems they are able to increase system spectral efficiency meanwhile they can fairly support a wide range of connectivities in order to serve the whole network users based on theirrequirements Hence NOMA is one of the notable techniques to define the framework of 5G On the other hand for thesake of mobility of users processing errors and noise it is important to consider imperfect CSI assumption to approach thepractical scenarios Thus in this thesis the effect of imperfect channel state information CSI on a downlink MIMO NOMAin presence of co channel interference resources has been investigated Inter pair interference is one of the most importantfactors that can result in system performance degradation In order to cancel this interference signal alignment technique isused by designing suitable detection vectors and precoding matrice that can remove inter pair interference from the user sreceived signal Using signal alignment and considering channel estimation error the exact and upper bound formulas for theoutage probability of the users are achieved Then closed form expression for the outage probability is derived using sometheorems Closed form expression is independent of the stochastic parameters of system and can pave the way to optimizethe other parameters in future researches Simulation results indicates the amount of channel estimation error effect on theperformance of the system users in two different conditions of with without the presence of interference resources Anotherfigure in simulation results depicts the outage probability of the system users according to different values of the powerallocation coefficients Key Words Non Orthogonal Multiple Access Imperfect CSI Signal Alignment MIMO Systems

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علي محمد دوست حسيني