Telecommunication

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

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    Adaptive co-existence of OFDM and OTFS for Multi-Mobility scenarios in wireless communications
    (Université M’Hamed Bougara de Boumerdes : Institut de génie electrique et electronique (IGEE), 2024) Zegrar, Hadj Mebarek; Smaili, Nesrine (Supervisor)
    The rapid evolution of technology necessitates the development of new waveforms capable of handling the increasing demands of high-mobility scenarios. Orthogonal Frequency Di-vision Multiplexing (OFDM), although extensively used in current wireless communication systems, experiences significant performance degradation in highmobility environments due to large Doppler shifts and Doppler spread effects .To address these challenges, a novel waveform called Orthogonal Time Frequency Space (OTFS) has been developed, offer ingsuperior performance in highmobility scenarios by exploiting delay-Doppler diversity. However, OTFS introduces high processing complexity and does not exhibit obvious performance advantages for low-mobility users, where OFDM remains efficient and effective. There fore, there is a critical need to develop a co-existence method that leverages the strengths of both waveforms. we proposed a method to check the user’s velocity and dynamically switch between OFDM and OTFS based on user mobility. By doing so, the communication system can achieve optimal performance of Bit Error Rate (BER) versus Signal-to-Noise Ratio (SNR), maintaining robust and efficient data transmission across diverse mobility conditions.
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    Study of plus slotted microstrip antenna for wireless applications
    (2016) Bencharef, Fatma Zohra; Haouchine, Leila; Azrar, Arab (Supervisor)
    This project deals with the design and simulation of a New Microstrip Patch Antenna using IE3D software. The designed antenna was given a name of "Plus Antenna for Wireless Applications". A rectangular antenna with an operating frequency of 2.4 GHz has been studied at the beginning. Later, the rectangular shape is modified to Plus Shaped Antenna and its study has shown two frequencies. The analysis is then extended to Plus Shaped Antenna loaded by two slots. The obtained results show that the antenna can operate at to 1.72 GHz that can be used in third generation 3G application and 2.98GHz useful in WiMax applications. In addition, the reduction in the operating frequency from 2.4 GHz to 1.72 GHz has allowed size reduction of the structure of about 52%.
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    Comparative study of unencoded MIMO systems.
    (2016) Khezzane, Yacine; Seridi, Mohammed Fekhreddine; Dahimene, Abdelhakim