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Theoretical Investigation of Electronic and Optical Properties of Si/SiGe Quantum Cascade Structures

Advances in Materials Physics and Chemistry 2013年第1期3卷 19-24页

作者： Khadidja Zellat Belabbes Soudini Salah Mohamed Ait Cheikh Applied Materials Laboratory (AML) University of Sidi Bel Abbès Sidi Bel Abbès Algeria laboratoire de dispositifs de communication conversion photovoltaique Ecole Nationale Polytechnique Algiers Algeria

This paper reviews the basic properties of the SiGe alloy, presents some new results on its electronic and optical properties, and discusses the approach that has been followed to model quantum wells containing SiGe layers for applications in quantum cascade lasers. The shape of the confining potential, the subband energies and their eigen envelope wave functions are calculated by solving a one-dimensional Schr?dinger equation. The calculations of optical parameters are used to optimize the Si/SiGe quantum cascade structures. Our results are found to be in good agreement with other calculations.

关键词： SiGe Alloy Electronic and Optical Properties Quantum Cascade Lasers (QCLs)

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Simulation of a Prototype 5G Network Integrating D2D communication and MEC Technology

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Circuits and Systems 2023年第7期14卷 29-38页

作者： Abdou Karim Farota Harouna Moussa Sanghotte Salick Diagne Babacar Niang Bouya Diop laboratoire des Sciences de l’Atmosphère et de l’Océan—Matériaux Energie et Dispositifs Université Gaston Berger de Saint-Louis Saint-Louis Senegal

In this paper, we study the coexistence of two key technologies in the same fifth-generation network, namely D2D (device-to-device) communication and MEC (Multi-Access Edge Computing) technology. These two promising technologies each have important roles to play in future telecommunications networks. D2D communication is a technology that aims to improve communication efficiency, increase overall throughput, and decrease latency. Multi-Access Edge Computing, a promising new concept, overcomes the burden of core cloud servers. This makes it possible to provide large storage, compute, and resource capacities to mobile edge nodes. With its closest deployment to users, it significantly reduces end-to-end transmission time. Our architecture consists of an access network and a central network, a base station (gNodeB), users, an MEC server and a gateway (UPF) to connect it to the RAN (Radio Access Network) of the core network. The base station controls communication by managing signaling and interference. The MEC server is placed next to the BS to provide data to the devices. It plays the role of the cloud that is located in the core network and allows you to store data and then do calculations for good communication between devices. Finally, we did a simulation using the OMNeT software. The results showed us that the data transmission passed well between the end devices, the antennas and the MEC server with very low latency and reliability.

关键词： D2D MEC Edge Computing Basic Station OMNeT

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Performances Analysis of a System of Localization by Angle of Arrival UWB Radio

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International Journal of communications, Network and System Sciences 2020年第2期13卷 15-27页

作者： Salick Diagne Thierry Val Abdou Karim Farota Bouya Diop Ognadon Assogba laboratoire des Sciences de l’Atmosphère et des Océans: Matériaux Energies et Dispositifs (LSAO-MED) Gaston Berger University Saint-Louis Senegal IRIT University of Toulouse2 Toulouse France

The increasingly widespread use of sensor and actuator networks and in general of the Internet of Things (IoT) in several areas of precision, imposes upon localization systems that can often equip them with a robust and more precise localization. It is in this sense that UWB technology has proved to be one of the most powerful communication technologies for these localization systems;thanks, in particular to the bandwidth occupied instantaneously by the signal allowing a very fine temporal resolution. Constructors have set up localization kits based on various technologies. These kits facilitate in a way the work of localization of users. In this paper, we present results on the performance study of the decawave PDoA Kit. This Kit uses the PDoA (Phase Difference of Arrival) to determine the Angle of Arrival (AoA) parameter with UWB technology. This study is in context of localization by AoA for an application to protect agricultural crops against grain-eating birds. The results of the study show overall AoA measurement errors around 10 degrees in an ideal environment.

关键词： Angle of Arrival (AoA) Localization UWB PDoA

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