1,720,970 research outputs found
Application of Superconducting Receivers to Advanced Satellite and Space Communications Systems
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Impact of mobility on geographic routing
No full textA new location-based reactive multi-hop protocol, namely the e-GPSR algorithm, is tested for the use in UWB sensor networks for logistic applications. Specifically, the impact of location information errors on the algorithm's performance is investigated when a Manhattan mobility model is assumed and a suitable position prediction model is introduced. The performance improvement produced by the combination of the e-GPSR algorithm with the prediction model is measured in terms of increased success delivery rate and reduced failures obtained by means of extensive system simulations. © 2008 IEEE
Cross-Layer Design of a LDR-L/T UWB Sensor Network
No full textLow data rate location/tracking UWB sensors have both location/tracking and communication capabilities, calling for novel routing and MAC strategies, in order to efficiently manage ranging and data transfer. In this paper, a particular configuration is adopted for routing and MAC, that are strongly correlated, because both are tied to the ranging module. Hence, a cross-layer design approach appears as the most appropriate. The routing algorithm, the e-GPSR, is a novel energy-aware version of a geographic reactive multi-hop protocol, namely the Greedy Perimeter Stateless Routing (GPSR). The MAC scheme is a modified hybrid slotted-aloha time-hopping code division multiple access. Performance of the e-GPSR are evaluated as a function of design parameters of MAC and ranging module. Optimal values are provided for different degrees of network’s mobility such that MAC and ranging are optimally designed to provide best performance of routing
Impact of Mobility on Geographic Routing
No full textA new location-based reactive multi-hop protocol, namely the e-GPSR algorithm, is tested for the use in UWB sensor networks for logistic applications. Specifically, the impact of location information errors on the algorithmpsilas performance is investigated when a Manhattan mobility model is assumed and a suitable position prediction model is introduced. The performance improvement produced by the combination of the e-GPSR algorithm with the prediction model is measured in terms of increased success delivery rate and reduced failures obtained by means of extensive system simulations
e-GPSR for LDR-L/T UWB Sensor Networks
No full textRouting performance is evaluated for a network of low data rate location/tracking UWB sensors that implement the energy-aware greedy perimeter stateless routing (e-GPSR). Sensors have both location/tracking and communication capabilities, that allow the use of a geographic reactive multi-hop routing protocol, like the e-GPSR. In order to efficiently manage the tasks of ranging and data transfer, a particular MAC scheme is adopted. Different degrees of connectivity and different densities of anchors and mobile nodes are considered in the analysis. A performance improvement is given by an increase of the number of anchors, especially in situations of scarce connectivity
The Italian solution for the cadastre of technological infrastructures
No full textThis paper aims at showing the implementation of the Italian cadastre of technological infrastructures, its maintenance and updating. SINFI (National Infrastructure Federated Information System) is the identified platform devoted to the coordination and management of national infrastructures in the framework of the broadband and ultra-broadband Italian strategy. Among its functions, it facilitates sharing of infrastructures, thanks to coordinated management of the under- and over-ground technological networks and related interventions; it also offers a single dashboard that efficiently manages and monitors all interventions. Previously, the need for such a platform was put in relation to the rational use of the underground and the implications onto the management of public land: consequently, even on the mobility infrastructures and transportation systems, as well as risks for people and manufactured goods, but also to prevent potential economic damages from accidental breakage of pipes and ducts. The increased awareness in terms of safety and civil protection has further expanded its importance, linking, for example, its availability to environmental issues (such as hydrogeological instability) to the context of critical infrastructure management (see Directive 2008/114 / EC) Last but not least, the availability of such a register is necessary to publicly check choices on sustainable development, according with the UN 2030 Agenda for Sustainable Development, signed in September 2015 by the Governments of 193 UN Member Countries, specifically with respect to the themes of Strategic Development Goals 9 (“Build Resilient infrastructure, promote inclusive and sustainable industrialization and foster innovation”) and 11 (“Make cities and human settlements inclusive, safe, resilient and sustainable”). The paper aims at providing solid answers to a multiplicity of operators / stakeholders in this respect / application framework, thanks to the availability of a national information system specifically dedicated to the over- and under-ground network infrastructures - the SINFI1
Integration of broadband wireless technologies and PMR systems for professional communication
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