5G positioning with software-defined radios Palamà, Ivan; Lizarribar, Yago; Monteforte, Lorenzo Maria ...
Computer networks (Amsterdam, Netherlands : 1999),
August 2024, 2024-08-00, Letnik:
250
Journal Article
Recenzirano
Odprti dostop
Positioning is a key focus in 5G standardization, starting with 3GPP Release 16. However, most of the effort from the research community and work presented in the technical standardization has been ...limited mainly to simulation studies. This paper explores the use of software-defined radios (SDRs) platforms for 5G positioning, presenting an overview of the current state-of-the-art and available open-source platforms. Utilizing an advanced SDR-based multi-gNodeBs (gNBs) synchronized testbed, the paper conducts a series of time-based, over-the-air measurements. Results offer insights into the impact of various real-world system parameters, such as the number of gNBs, transmission bandwidth, signal processing techniques, and localization algorithms on positioning accuracy and Time to First Fix (TTFF). These findings provide a pathway for the cost-effective and efficient implementation of high-precision 5G localization systems. The paper contributes to advancing both theoretical understanding and practical applications, serving as a guide for the development of 5G positioning technology.
GDP-mannose 3,5-epimerase (GM35E, GME) belongs to the short-chain dehydrogenase/reductase (SDR) protein superfamily and catalyses the conversion of GDP-d-mannose towards GDP-l-galactose. Although the ...overall reaction seems relatively simple (a double epimerization), the enzyme needs to orchestrate a complex set of chemical reactions, with no less than 6 catalysis steps (oxidation, 2x deprotonation, 2x protonation and reduction), to perform the double epimerization of GDP-mannose to GDP-l-galactose. The enzyme is involved in the biosynthesis of vitamin C in plants and lipopolysaccharide synthesis in bacteria. In this review, we provide a clear overview of these interesting epimerases, including the latest findings such as the recently characterized bacterial and thermostable GM35E representative and its mechanism revision but also focus on their industrial potential in rare sugar synthesis and glycorandomization.
In the work a method of latency measurement in software defined radio (SDR) is proposed and validated. The test setup uses customer grade GNSS modules as reference time sources and enables relative ...delay calculation between signals received directly and those bypassed through SDR platform. The method is hardware agnostic in a sense, that it does not involve any custom software or hardware modifications. Tests that compare reported carrier-to-noise ratio and positioning errors were performed to prove functionality of such system. Additionally, authors measured several
blocks with respect to their impact on total latency introduced into signal path. All tests were performed on a bladeRF low-cost RF front-end. Minimum observed latency for the signal was below 10 ms.
The GNSS software receiver has evolved as a promising tool for researchers and developers because of its flexibility and reconfigurability. As modernized GNSS signals have been emerging day by day, ...the need to adapt the software receiver to address the upcoming challenges of GNSS navigation has become inevitable. The main aim of this work is to assess the existing Global Navigation Satellite System Software Defined Receiver (GNSS-SDR) tool for Indian Regional Navigation Satellite System (IRNSS) signals using a low-cost RTL-SDR front-end. The IRNSS software receiver chain is developed using GNSS-SDR code and framework. GNSS-SDR is an open-source tool developed by the Centre Tecnològic de Telecomunicacions de Catalunya (CTTC) of Spain. This work is useful for carrying out various GNSS-related applications using IRNSS signals in the future and paves the way for further research and development of the IRNSS system by using it as a research/academic tool.
El Sistema Global de Comunicaciones Móviles (GSM) ha tenido una gran aceptación alrededor del mundo. Para implementar estos sistemas era necesario utilizar equipos de costo elevado, sin embargo, ...gracias al desarrollo de sistemas de radios definidos por software, es posible desarrollar este tipo de redes con un costo reducido. El acceso a servicios de telecomunicaciones en comunidades rurales de Cuba es hoy en día un gran reto, propiciado principalmente, por la ubicación geográfica y el reducido número de habitantes que hacen que el despliegue de infraestructura no sea económicamente factible. Las contribuciones principales del presente trabajo son un sistema celular alternativo y software de administración de red GSM. Quedó demostrado que es posible la construcción de una red telefónica móvil usando componentes de software libre y hardware de bajo costo, que pueden ser empleados en comunidades rurales de poca población, así como en situaciones de emergencia.
The combined radio transmission monitoring of content, control commands and speech on the basis of modern digital SDR (Soft Define Radio) radio is considered.
The Global System for Mobile Communications (GSM) has been widely accepted around the world. The implementation of this system for a comunity are expensive because to use high-cost equipment, but ...thanks to the development of software-defined radio systems, it is possible to develop this type of network at a reduced cost. Access to telecommunications services in rural communities in Cuba is today a great challenge, mainly caused by the geographical location and the small number of habitants that make the deployment of infrastructure not economically feasible. The main contributions of the present work focus in an alternative cellular system and GSM network management software. It was shown that it is possible to build a mobile telephone network using free software components and low-cost hardware, which can be used in sparsely populated rural communities, as well as in emergency situations.
Compressed-SDR to HDR Video Reconstruction Wang, Hu; Ye, Mao; Zhu, Xiatian ...
IEEE transactions on pattern analysis and machine intelligence
46, Številka:
5
Journal Article
Recenzirano
The new generation of organic light emitting diode display is designed to enable the high dynamic range (HDR), going beyond the standard dynamic range (SDR) supported by the traditional display ...devices. However, a large quantity of videos are still of SDR format. Further, most pre-existing videos are compressed at varying degrees for minimizing the storage and traffic flow demands. To enable movie-going experience on new generation devices, converting the compressed SDR videos to the HDR format (i.e., compressed-SDR to HDR conversion) is in great demands. The key challenge with this new problem is how to solve the intrinsic many-to-many mapping issue. However, without constraining the solution space or simply imitating the inverse camera imaging pipeline in stages, existing SDR-to-HDR methods can not formulate the HDR video generation process explicitly. Besides, they ignore the fact that videos are often compressed. To address these challenges, in this work we propose a novel imaging knowledge-inspired parallel networks (termed as KPNet) for compressed-SDR to HDR (CSDR-to-HDR) video reconstruction. KPNet has two key designs: Knowledge-Inspired Block (KIB) and Information Fusion Module (IFM). Concretely, mathematically formulated using some priors with compressed videos, our conversion from a CSDR-to-HDR video reconstruction is conceptually divided into four synergistic parts: reducing compression artifacts, recovering missing details, adjusting imaging parameters, and reducing image noise. We approximate this process by a compact KIB. To capture richer details, we learn HDR representations with a set of KIBs connected in parallel and fused with the IFM. Extensive evaluations show that our KPNet achieves superior performance over the state-of-the-art methods.
Prototipo de red GSM basada en SDR Arévalo, Germán; Paredes Paredes, Martha Cecilia; Tipantuña Tenelema, Christian José ...
Revista de Investigación en Tecnologías de la Información,
2022, Letnik:
10, Številka:
21
Journal Article
Recenzirano
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This paper presents the implementation of a GSM (Global System for Mobile Communications) network prototype based on SDR (Software Defined Radio) using the Linux-based OpenBTS software and the USRP ...(Universal Software Radio Peripheral) hardware. GSM has been chosen because it is one of the most successful standards with the most significant impact on the mobile telephony ecosystem. It has been the key to the development of subsequent generations. By integrating GSM with SDR, it is possible to implement a prototype of an experimental GSM network, which can become a testbed for future innovations and developments in SDR dynamics that seek to provide alternative mobile infrastructures to rural populations in Ecuador and around the word that they still are part of the great digital divide. Keywords: GSM, SDR, OpenBTS, USRP.doi: https://doi.org/10.36825/RITI.10.21.004
Este artículo presenta la implementación de un prototipo de red GSM (Global System for Mobile Communications) basado en SDR (Software Defined Radio) utilizando el software OpenBTS basado en Linux y el hardware USRP (Universal Software Radio Peripheral). Se ha elegido GSM por ser uno de los estándares de mayor éxito e impacto en el ecosistema de la telefonía móvil y base para las siguientes generaciones. Al integrar GSM con SDR es posible implementar un prototipo de red GSM experimental, el cual puede llegar a convertirse en un banco de pruebas para futuras innovaciones y desarrollos en la dinámica SDR cuyo objetivo que es brindar infraestructuras móviles alternativas para poblaciones rurales en Ecuador y en el mundo que forman parte de la gran brecha digital.Palabras clave: GSM, SDR, OpenBTS, USRP.doi: https://doi.org/10.36825/RITI.10.21.004
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