Fraunhofer Institute For Integrierte Schaltungen
Fraunhofer Institute For Integrierte Schaltungen
Ulbricht G.,Fraunhofer Institute For Integrierte Schaltungen |
Kneissl J.,Fraunhofer Institute For Integrierte Schaltungen |
Kelm C.,Fraunhofer Institute For Integrierte Schaltungen |
Kilian G.,Fraunhofer Institute For Integrierte Schaltungen
Journal of Signal Processing Systems | Year: 2017
Nowadays, most radio implementations are based on software-defined radio (SDR) technologies. The capabilities of digital signal processing enable new applications like low power wide area networks (LPWAN), which are expected to play a decisive role in the upcoming Internet of Things. Centralized gateways, usually realized in an SDR architecture, are used to connect many thousands of objects to the internet. Due to the high variance of the received signal level, a high dynamic range is required for the SDR receiver front-end. In current receiver architectures, the dynamic range is mainly limited by the analog-to-digital converter (ADC). Several techniques have been proposed to extend the dynamic range by stacking multiple ADCs and driving them with different gain factors. Correlation of quantization noise was identified as key parameter to determine the dynamic range enhancement. This paper compares the proposed techniques and extends existing analysis tools for the use of arbitrary gain factors. Additionally, the influence of further noise sources like thermal noise and jitter are taken into account. The theoretical considerations are supported by simulations and measurements using a real LPWAN SDR implementation. © 2017 Springer Science+Business Media New York
Bischl H.,German Aerospace Center |
Brandt H.,German Aerospace Center |
De Cola T.,German Aerospace Center |
De Gaudenzi R.,European Space Agency |
And 9 more authors.
International Journal of Satellite Communications and Networking | Year: 2010
This paper presents the detailed design and the key system performance results of a comprehensive laboratory demonstrator for a broadband Ka-band multi-beam satellite system exploiting the new DVB-S2 standard with adaptive coding and modulation (ACM). This complete demonstrator allows in-depth verification and optimization of the ACM techniques applied to large satellite broadband networks, as well as complementing and confirming the more theoretical or simulation-based findings published so far. It is demonstrated that few ACM configurations (in terms of modulation and coding) are able to efficiently cope with a typical Ka-band multi-beam satellite system with negligible capacity loss. It is also demonstrated that the exploitation of ACM thresholds with hysteresis represents the most reliable way to adapt the physical layer configuration to the spatial and time variability of the channel conditions while avoiding too many physical layer configuration changes. Simple ACM adaptation techniques, readily implementable over large-scale networks, are shown to perform very well, fulfilling the target packet-error rate requirements even in the presence of deep fading conditions. The impact of carrier phase noise and satellite nonlinearity has also been measured. Copyright © 2009 John Wiley & Sons, Ltd.
Celidonio M.,Fondazione Ugo Bordoni |
Di Zenobio D.,Fondazione Ugo Bordoni |
Fionda E.,Fondazione Ugo Bordoni |
Grau Panea G.,Indra |
And 6 more authors.
IEEE Vehicular Technology Conference | Year: 2012
SafeTRIP is a project in progress partially financed by the Seventh Framework Programme's (FP7) European research and development activities in the subtheme of Sustainable Surface Transportation. SafeTRIP intends to implement a demonstrator of an integrated system, from data collection to service provision, that aims at optimising the use of road transport infrastructures. In this paper a general overview of the SafeTRIP architecture is presented. A detailed analysis and description of the functionalities characterizing the main elements of the system and a brief description of infomobility services such as alerting, disaster recovery and dynamic traffic data is given. A relevant part of this architecture is the Satellite Communication System which operates through the W2A Geostationary Satellite. To have an idea of the potentialities of the proposed system, a summary of functional requirements and performances relating to different types of services implemented is reported. © 2012 IEEE.
Scholtelburg C.,VDE Verband der Elektrotechnik Elektronik Informationstechnik E.V. |
Feussner H.,TU Munich |
Meining A.,TU Munich |
Meyer J.-U.,Fa. mt2it |
And 2 more authors.
Endoskopie Heute | Year: 2011
The topic "Theragnostics in the Operating Theatre Closed-Loop Diagnostics and Surgery" was discussed based on 15 scientific lectures held at the 7.Symposium "Hospital of the Future" on March16th, 2011, in Munich. The symposium was organized by the DGBMT - German Society for Biomedical Engineering, the Fraunhofer Society and the SMIT - Society for Medical Innovation and Technology. The symposium was completed by a multi disciplinary panel discussion that focussed on chances and limitations of closed-loop-systems in operating theatres. In summary the discussion showed, that there is a significant potential for using closed-loop-systems in operating theatres and the technological possibilities have not been completely utilized yet. However, the surgeon as the human part of the control circuit will not be substituted in near future. An important requirement for the successful implementation of closed-loop-concepts in the operating theatre is the generation of adequate multi-disciplinary competence in both fields, technological development and clinical application. © Georg Thieme Verlag KG Stuttgart · New York.
Ebensperger T.,Fraunhofer Institute For Integrierte Schaltungen |
Ebensperger T.,University of Würzburg |
Nachtrab F.,Fraunhofer Institute For Integrierte Schaltungen |
Nachtrab F.,Friedrich - Alexander - University, Erlangen - Nuremberg |
And 4 more authors.
Proceedings - IVNC 2011: 2011 24th International Vacuum Nanoelectronics Conference | Year: 2011
In recent years X-ray tomography has made progressive steps towards spatial resolution in the sub-micron range. A limiting factor is the finite focal spot size of state-of-the-art microfocus tubes. In this contribution we present a radiography setup with an X-ray source capable of generation focal spot sizes down to 80 nm, thanks to special targets designed using Monte Carlo simulations. Together with a high geometric magnification and a low-noise photon-counting detector this makes the setup ideal for material characterisation at the nanoscale.
Franz M.,Fraunhofer Institute For Integrierte Schaltungen |
Kasperl S.,Fraunhofer Institute For Integrierte Schaltungen |
Stamminger M.,Friedrich - Alexander - University, Erlangen - Nuremberg
Technisches Messen | Year: 2010
Computed tomography (CT) can be used for dimensional measurement. Reliable results require an effective artefact correction. In two earlier papers a Synchronous Artefact Correction (German: Einsatzsynchrone Artefakt-Reduktion EAR) was introduced. In this paper some further developments of EAR are given though the key concept isn't altered. It is still two-staged with a separation in fine and coarse registration, the latter is subdivided into translation and rotation. For the coarse rotation the idea of the Overall Cachment Area is applied. In-depth tests favoured "Normalized Mutual Information" that was only second-best in the prime research. Another topic is the analysis of the accuracy of the registration result concerning the applied similarity measure. In this test "Normalized Mutual Information" was figured out to be the measure with the highest accuracy. © Oldenbourg Wissenschaftsverlag.
Worrall D.,Fraunhofer Institute For Integrierte Schaltungen
Organised Sound | Year: 2014
Parameter mapping sonification is the most widely used technique for representing multi-dimensional data in sound. However, it is known to be unreliable when used for detecting information in some types of data. This is generally thought to be the result of the co-dependency of the psychoacoustic dimensions used in the mapping. Positing its perceptual basis in a theory of embodied cognition, the most common approach to overcoming this limitation involves techniques that afford the interactive exploration of the data using gross body gestures. In some circumstances, such exploration is not possible and, even when it is, it may be neither necessary nor sufficient. This article explores some other possible reasons for the unreliability of parameter mapping sonification and, drawing from the experience of expressive musical performance, suggests that the problem lies not in the parametric approach per se, nor in the lack of interactivity, but in the extent to which the parameters employed contribute to coherent gestalts. A method for how this might be achieved that relies on the use of micro-gestural information is proposed. While this is speculative, the use of such gestural inflections is well known in music performance, is supported by findings in neuroscience and lends itself to empirical testing. © 2014 Cambridge University Press.
PubMed | Fraunhofer Institute For Integrierte Schaltungen
Type: | Journal: Studies in health technology and informatics | Year: 2012
Due to the changing demographics and cost problems in health systems, an ever increasing portion of the ageing population is ready to use personalized technology for health applications as well as for assistance and care in order to remain in their familiar environment as long as possible. Despite their resulting market potential, Personal Health and AAL (Ambient Assisted Living) solutions are still waiting for broad application. In addition to a lack of viable business models broadly accepted as a main obstacle to market success, further shortfalls of dominating insulated available Personal Health and AAL products are identified. To overcome these, the ongoing European universAAL project and related community building activities of the AALOA Association aim at a broadly accepted unified interoperable open AAL platform that incorporates existing AAL platform concepts and particularly includes the already established ISO/IEEE 11073 standards-based Continua Personal Health ecosystem.