Rasoul Ebrahimzadehchari présente son projet de thèse

INF9009-Projet de these

Enhancing 5G and 6G Wireless Communications Through
Orbital Angular Momentum (OAM) Beams

by
Rasoul Ebrahimzadehchari

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URL de réunion : https://uqo.zoom.us/j/81649252799?pwd=nKyhbaQ2KG272bVElcIozV5qFFJdTd.1

Nº de réunion : 816 4925 2799

Mot de passe : 228880

Abstract:
With the advent of 5G wireless communication and networking technologies, the demand for enhanced channel capacity, isolation, connection reliability, and spectrum efficiency has significantly increased. To address these challenges, several methods have been explored to improve wireless connection efficiency, including dual-polarized configurations, Multi-Input Multi-Output (MIMO) systems, and frequency, amplitude, and phase modulation techniques. All these methods have been implemented using the linear momentum of electromagnetic (EM) waves. Our proposal, however, deals with a new approach to further enhance wireless link capabilities by exploring the orbital angular momentum (OAM) properties of EM waves, which provide an additional degree of freedom for controlling the waves properties.
The key distinction between OAM waves and plane waves is that OAM waves exhibit a spiral phase factor on their wavefronts, expressed as exp(jlϕ), where l is the mode of the generated OAM beam, and ϕ is the azimuthal angle. This unique feature of OAM offers both advantages and challenges, which are discussed in detail. For instance, due to the orthogonality of OAM beam modes, it becomes possible to transmit unlimited data streams at a single frequency. On the other hand, the beam divergence of OAM waves over long distances poses a significant challenge for this type of communication link. As a result, various methods for mitigating these drawbacks have been evaluated and compared.
Several approaches have been explored, including the generation of dual OAM beams using a bilayer transmissive Huygens metasurface with independent phase control for orthogonal polarizations, a scalable, densely packed configuration for continuous OAM beam steering utilizing a uniform circular filtering antenna array, and the exploration of polarization, frequency, pattern, and mode diversity in OAM beams using a dual-band and dual-polarized metasurface.

Président de jury: Prof. Michael L. Korwin-Pawlowski, UQO
Membre externe : Prof. Serioja Tatu, INRS-ÉMT
Membre interne : Prof. Tinko Eftimov, UQO
Directeur de recherche : Prof. Larbi Talbi, UQO
Codirecteur de recherche : Dr. Khelifa Hettak, CRC