Authors:Staniša Perić, Nina Vukić, Dragan Antić, Marko Milojković, Anđela Đorđević Pages: 001 - 013 Abstract: This paper presents an application of convolutional neural networks (CNN) in autonomous driving system, which represents the capacity of a vehicle to operate mostly or entirely autonomously, with or without human assistance. After basic introduction of CNN, we design and apply CNN-based algorithm in road type classification problem. The performed simulations show that satisfactory results can be achieved even with little data available. PubDate: 2023-07-29 DOI: 10.22190/FUACR230123001P Issue No:Vol. 22, No. 1 (2023)
Authors:Aleksandar Dimitrijević Pages: 015 - 028 Abstract: The enormous volumes of geospatial data and the need to process and distribute them cry out for a unified framework that enables their efficient storage, analysis, and a high degree of interoperability. Discrete global grid systems provide such a framework by hierarchically tessellating cells to seamlessly partition and address the globe. Since they are usually based on a regular polyhedron, they partition the entire world into as many discrete data sets as the given polyhedron has sides. In this paper, we try to reduce the number of partitions to two, which is a minimum if we want to obtain spatially convex partitions without interruptions. Two approaches are presented, based on an adjusted spherical cube and an equidistant cylindrical projection. The distortions resulting from the application of these projections are compared and guidelines are presented to improve the quality of their implementation by reducing the distortion of the continental plates and making a better mapping to the WGS84 ellipsoid. PubDate: 2023-07-29 DOI: 10.22190/FUACR230322002D Issue No:Vol. 22, No. 1 (2023)
Authors:Aleksandra Panajotović, Jelena Anastasov, Dejan Milić, Daniela Milović, Nikola Sekulović Pages: 029 - 038 Abstract: This paper analyzes a performance of uplink power-domain non-orthogonal multiple access (NOMA) system with 2K users in which a resource allocation is taken into consideration. Since the power allocation and user pairing are tightly intertwined, they are considered as a hybrid issue. Accordingly, High-High/High-Low user pairing process precedes date rate-based power allocation. Derived closed-form expressions for the outage probabilities and the sum data rate for uplink power-domain NOMA system over a composite Fisher-Snedecor (F) fading channel are used for an extensive performance evaluation. The impact of different fading/shadowing channel conditions, various users’ positions and their number on the performance metrics is examined. Presented results have high level of generality since the F fading model provides accurate characterization of the multipath/shadowing conditions in numerous communication scenarios of interest. PubDate: 2023-07-29 DOI: 10.22190/FUACR230324003P Issue No:Vol. 22, No. 1 (2023)
Authors:Goran Stančić, Ivan Krstić, Saša S. Nikolić, Ivana Kostić Pages: 039 - 055 Abstract: In this paper a new method for design of the first order differentiator is presented. The proposed differentiator consists of two parallel branches, i.e. direct path and IIR all-pass filter. The described design method allows one to obtain solution with minimum mean relative error at the desired region by controlling the ratio of phase response extremes. A small relative magnitude error, as well as a low phase error, at low frequencies is condition for good time domain behaviour. The obtained differentiator can be realized by means of only two multipliers, hence being a good choice for real time applications. The proposed solution provides a lower magnitude error than several known differentiators with similar phase error. PubDate: 2023-07-29 DOI: 10.22190/FUACR230324004S Issue No:Vol. 22, No. 1 (2023)
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