Telecommunication

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

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Author: search.filters.author.Zitouni, Abdelkader (Supervisor)

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Now showing 1 - 6 of 6
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    Optimizing the EDFA gain for WDM lightwave systems
    (2021) Kohili, Yousra; Zitouni, Abdelkader (Supervisor)
    Optical amplifiers play a vital role in Optical Fiber Communication Systems as they are used to compensate the total optical signal attenuation along the transmission path and hence permit to build optical fiber communication systems of very long distances without using repeaters and signal regenerators. However, in modern WDM (Wave Division Multiplexer) systems where several optical carriers of different wavelengths (or frequencies) may share a single fiber, the Erbium Doped Fiber based amplifier (DFA), one of the most commonly used type of amplifiers, shows non-uniform gain characteristics with respect to the carrier frequency. In addition, The default parameter values used to carry out system analysis using simulation tools do not necessarily give accurate results. The objective of this work is therefore to conduct a study and an analysis of the EDFA to show first its behavior when used in WDM systems and estimate the best frequency range (operating band) of use and, second to estimate better (optimal) parameters values that should be used with a simulator (Optisystem) to obtain more reliable analysis of WDM transmission systems rather than default ones provided by the software.
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    Performance analysis of dispersion compensation using FBG and DCF in WDM systems
    (2021) Benamrouche, Lina; Zitouni, Abdelkader (Supervisor)
    This project is about studying several factors and dispersion compensators that affect the performance parameters in WDM optical fiber transmission systems. At frequency of 193.1THz with spacing frequency of 100Ghz. In the first part of the simulation, 4-Channel WDM system is designed and simulated. Only the results of channel 1 which got discussed as Q factors and eye diagrams dependent on change in distance, transmission rates and input power values, then on FBG and DCF added as dispersion compensators in different configurations. In the next part, 8-Channel WDM system is designed and simulated for 60Km transmission distance at 5GBit/s transmission rate and input power of 10dBm. The results of channels 1, 5 and 8 are discussed for different DCF and FBG techniques. Finally, 2-Channel WDM system is designed and simulated for 120Km, at 6GBit/s for input power of 10dBm. The results of channel 1 and 2 are discussed for multistage FBG and DCF techniques. Keywords : WDM, Dispersion, FBG, DCF, Performance parameters.
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    Study and simulation of the link adaptation technology in the LTE standard
    (2016) Meziane, Mokrane; Allilat, Fetta; Zitouni, Abdelkader (Supervisor)
    The Long Term Evolution first introduced by the link adaptation system as a massive step forward in the control of the network resources. It is mainly based on measuring instantaneous Signal to Interference and Noise Ratio (SINR) which is used to investigated the influence of several parameters on the link adaptation error characteristics. Adaptive Modulation and Coding (AMC) is used to increase the network capacity or downlink data rates. Spatial multiplexing techniques for MIMO antenna configurations are also considered. This report has outlined the various scheduling techniques used in the link adaptation process to increase the throughput of the network. Three major channel state report measurements are used to perform the adaptations which are: CQI (channel quality indicator), PMI (Precoding Matrix Indicator), and RI (Rank Indicator) measurements. An analysis and a comparison of these scheduling algorithms were done through simulations executed on MATLAB software. The impact of the scheduling schemes was examined on the throughput (Average Data Rate) and the Bit Error Rate (BER), and it was compared to the case where no adaptation is done. The fairness of the results given by each scheduling scheme was investigated. The link adaptation improved the transmission robustness through minimizing the error and increased the spectral efficiency to produce a satisfactory average data.
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    Digital Filters for reducing the effects of dispersion in optical communication
    (2016) Grainat, Youcef; Mebarki, Yaser; Zitouni, Abdelkader (Supervisor)
    The aim of this project is to use digital filters to reduce the effects of dispersion in modern WDM optical communication systems at two transmission speeds, 2.5 and 5 Gbps. For this purpose two types of filters [Gaussian Filter (GF) and Cosine Roll Off Filter (CROF)] have been tested by simulation using OptiSystem and Matlab in single mode fiber links at the operating wavelength of 1550 nm. From the obtained results a comparative study with respect to the conventional Dispersion Compensating Fibers (DCF) has been carried out.
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    Analytical studies of the modernization of the IGW (Internet Gateway) platform case : optimum telecom Algérie
    (2019) Hachour, Abdelghani; Khene, Loukmane hakim; Khene, Loukmane hakim; Zitouni, Abdelkader (Supervisor); Zitouni, Abdelkader (Supervisor)
    The internet is an indispensable service within the OTA company both in terms of the smooth running of the company and the quality of service provided to customers, unfortunately this service encounters an important problem that lies in availability that can affect the service continuity of one of the internet access sites of the company, to solve this problem and offer an optimal quality of service to the customer, the unification of the OTA network may leads to guarantee access to the internet to all the services of the company. An internet gateway can cope with many challenges in ubiquitous network systems such as efficiency, scalability, availability and reliability issues. The unification consists of three methods, single homing, double homing, triple homing. In this report we exploit by use of simulation, the strategic position of such methods to offer several higher-level services the obtained results will determine which of the three methods will be optimum in accordance with the technical and economic approval criteria.
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    Study and simulation of DWDM star topology network
    (2018) Bouchafa, Safia; Khodja, Khalida; Zitouni, Abdelkader (Supervisor)
    Nowadays, optical networks employing Dense Wavelength Division Multiplexing (DWDM) are the adopted technique used in modern communication networks that can meet the everincreasing demand for bandwidth of the end users. The development of nodal elements, such as Optical Cross-Connects (OXC) for DWDM networks, has led to huge possible network architectures for the optical layer. In this project, we study the effect of the input power, transmission speed, pre- and postcompensation techniques on the performance of an eight channel DWDM star topology operating at wavelength 1550 nm and consisting of a central node to which 64 other nodes are connected. OptiSystem 7.0 is used for building the overall system and carrying out simulations. The performance analysis is based on eye diagrams, Q Factor and simulated Bit Error Rate (BER).