Telecommunication

Permanent URI for this collectionhttps://dspace.univ-boumerdes.dz/handle/123456789/3080

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2016 - 201922020 - 20212

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Author: search.filters.author.Zitouni, A. (Supervisor)End date: 2024

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    Dispersion compensation schemes- a system perspective
    (2021) Derias, Nour El Houda; Ben cherif Ikhlef, Djelloul; Zitouni, A. (Supervisor)
    One of the main factors limiting the performance of WDM systems is dispersion. The use of dispersion compensation fiber (DCF) is the most commonly used dispersion compensation method in WDM systems. In this work, the performance WDM systems atfrequency of 193.1THz. with different dispersion compensation schemes using DCF (pre compensation, post compensation and symmetrical compensation techniques) are analysedin terms of BER and Q factor. As a first part of the simulation.In the next part, 4-Channel WDM system is designed and simulated. all channels were discussed as Q factors and eye diagrams dependent on change in different parameters, such as signal input power, bite rate, and variations of both DCF and SMF length each alone. once the simulation is presented without compensation, then DCF technique is added as dispersion compensators in different configurations. Finally, 8-Channel WDM system is designed and simulated and tested under a list of parameters signal input power, bit rate DCF and SMF lengths. The effect of all the previous parameters were studied on different channels then the obtained results are presented.
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    Study, simulation and estimation of losses of a DWDM point-to-point topology network using OTDR
    (2020) Chelihi, Nehad; Bouhadda, Fatma Zohra; Zitouni, A. (Supervisor)
    The aim of this project is to study the effect of the input power and the two different compensation techniques DCF and FBG on the performance of an eight channel Dense Wavelength Division Multiplexing (DWDM) line topology designed at wavelength 1550 nm, at three transmission speeds: 30, 60 and 90 Gbps. OptiSystem v.7.0 is used for building the overall system and carrying out simulations. The performance of the system is reported on the basis of eye diagram, Q-factor and Bit Error Rate (BER). The efficiencies of the two compensation methods, at high and low bit rates and input powers, are compared and presented in our final result discussion. In addition, a practical study have been done on the system by measuring the optical losses of the link using an optical time domain reflectometer (OTDR) at both 1310 and 1550 nm wavelengths to ensure its reliability and readiness to function well.
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    Study and imulation of the MIMO enabling technology in the LTE system
    (2016) Bammoune, Nabil; Belaid, Abdelmadjid; Zitouni, A. (Supervisor)
    Multi-antenna (MIMO) techniques are reported to improve the performance of radio communication systems in terms of their capacity and spectral efficiency. Long Term Evolution(LTE), one of the candidates for fourth generation(4G) mobile communication systems has MIMO as one of its underlying technologies and ITU defined channel models for its propagating environment. This project undertakes a comprehensive verification of the performance of spatial multiplexing MIMO in the downlink sector of LTE. The study and the analysis is done by the use of models built using MATLAB and Simulink to carry out simulations. It is deduced that spatial multiplexing improves spectral efficiency and increases data rate of the transmission. This is more pronounced if more antennas are used in the transmitter and the receiver. Furthermore, precoding operation for open loop and closed loop spatial multiplexing depends on the channel conditions.
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    Implementation of a PC-Based Phasor measurement unit using LabVIEW
    (2019) Benlakehal, Mohamed Elamine; Benlakehal, Mohamed Elamine; Benterkia, Mahdi; Zitouni, A. (Supervisor)
    In this report, we will explain the different steps to construct a Phasor Measurements Unit. These steps include, building an anti-aliasing filter using Sallen-Key topology, demonstrating the synchronization process using GPS and PLL circuit and implementing the phasor estimation based on Discrete Fourier Transform DFT algorithm and LabVIEW. The overall system has been successfully tested by connecting it to real signals and three-phase voltages amplitudes and phases are extracted then plotted on the computer screen either in time domain or as phasor-vectors.