Survey of Spectrum Sharing for Inter-Technology Coexistence

Increasing capacity demands in emerging wireless technologies are expected to be met by network densification and spectrum bands open to multiple technologies. These will, in turn, increase the level of interference and also result in more complex inter-technology interactions, which will need to be managed through spectrum sharing mechanisms. Consequently, novel spectrum sharing mechanisms should be designed to allow spectrum access for multiple technologies, while efficiently utilizing the spectrum resources overall. Importantly, it is not trivial to design such efficient mechanisms, not only due to technical aspects, but also due to regulatory and business model constraints. In this survey we address spectrum sharing mechanisms for wireless inter-technology coexistence by means of a technology circle that incorporates in a unified, system-level view the technical and non-technical aspects. We thus systematically explore the spectrum sharing design space consisting of parameters at different layers. Using this framework, we present a literature review on inter-technology coexistence with a focus on wireless technologies with equal spectrum access rights, i.e. (i) primary/primary, (ii) secondary/secondary, and (iii) technologies operating in a spectrum commons. Moreover, we reflect on our literature review to identify possible spectrum sharing design solutions and performance evaluation approaches useful for future coexistence cases. Finally, we discuss spectrum sharing design challenges and suggest future research directions

Design and implementation of a low-cost classroom response system for a future classroom in the developing world

Economic considerations and lack of adequate infrastructure impose unique design constraints on future classrooms of the developing world. Thus, future classrooms in underprivileged nations may differ significantly from their counterparts in the developed world. Classroom response systems (CRS) are an emerging technology for the future classroom. CRS are wireless, hand-held devices that help students provide immediate feedback to questions posed by a teacher. In their present form, due to their relatively high cost and high infrastructural requirements, such systems are not sustainable in most developing countries. This paper presents the design and implementation of a CRS based on an open-source, low-cost, and easily manufactured hardware. The CRS design is based on a hybrid wireless/wired platform using Bluetooth with the 1-Wire networking technology. This design significantly reduces the cost, and is consistent with existing conditions in a typical developing country

THE METAVERSE: A VIRTUAL WORLD IN THE PALM OF YOUR HAND

This paper explores the actual and future impact of the Metaverse as a virtual space. Thus, it focuses the probe on the technical challenges that face this everlasting emerging technology. Today, the Metaverse presents a digital environment to build collective architecture and historical heritage in a virtual space. In this digital world, the modeling and design methodology is based on individual archetypes that can puzzle new elements. Currently, traditional methods require change and adaptation in both the education and work market, especially due to the remote-work integration in the last few years. For example, many components are required to build a Virtual Reality (VR) laboratory or a VR museum. Virtual environments present us with novel opportunities to bring together the real world with a virtual extension or duplication. This technology will remove physical boundaries and design constraints and consequently will open a gate to a metaphysical world. Imagine a world with limitless space where gravity doesn’t exist, and water can float upward. There is no limit for art and architecture but even this magic has its limitation related to computer technology. Therefore, this paper surveys the state-of-the-art computational technologies and the ecosystems of the Metaverse. The paper covers the fields of Computer Vision, Human-Computer Interaction, Artificial Intelligence, Robotics, Internet of Things (IoT), Cloud Computing, and future mobile networks. In application, the Metaverse will allow users to have a fantastic experience being part of worldwide entertainment and socio-economic network

Rapid Prototyping of Embedded Vision Systems: Embedding Computer Vision Applications into Low-Power Heterogeneous Architectures

Embedded vision is a disruptive new technology in the vision industry. It is a revolutionary concept with far reaching implications, and it is opening up new applications and shaping the future of entire industries. It is applied in self-driving cars, autonomous vehicles in agriculture, digital dermascopes that help specialists make more accurate diagnoses, among many other unique and cutting-edge applications. The design of such systems gives rise to new challenges for embedded Software developers. Embedded vision applications are characterized by stringent performance constraints to guarantee real-time behaviours and, at the same time, energy constraints to save battery on the mobile platforms. In this paper, we address such challenges by proposing an overall view of the problem and by analysing current solutions. We present our last results on embedded vision design automation over two main aspects: the adoption of the model-based paradigm for the embedded vision rapid prototyping, and the application of heterogeneous programming languages to improve the system performance. The paper presents our recent results on the design of a localization and mapping application combined with image recognition based on deep learning optimized for an NVIDIA Jetson TX2