1,720,993 research outputs found
Street lighting in smart cities: A simulation tool for the design of systems based on narrowband PLC
No full textExcessive or improper street lighting is currently responsible for a significant waste of electrical energy in many cities worldwide. In order to improve energy efficiency, the traditional light posts are expected to be gradually replaced by smart systems able to adapt the features of the emitted light to different environmental, traffic, or crowdedness conditions. Power Line Communication (PLC) is the natural choice to support smart light control, since no additional communication infrastructure is needed. However, at the moment not so many simulation tools exist to guide the design and the deployment of smart lighting systems based on PLC. In this paper, we partially address this issue by presenting suitable circuit models that can be used to analyze (through simulations at the physical layer) the behavior of narrowband PLC (NB-PLC) signals transmitted over low-voltage (LV) lines for street light control. The proposed approach is quite simple from the computational point of view, and it is scalable enough to evaluate the quality of PLC signals in large networks with different topologies. The results of several simulations, with signals in the frequency range 95-148.5 kHz, have been compared with the outcomes of some laboratory experiments over a test line
Performance Analysis of PC-based Development Systems with Onboard ADCs/DACs for Digital Signal Processing Applications
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Caratterizzazione di un modello di propagazione di segnali radio per applicazioni di localizzazione indoor basate su reti wireless
No full textLa localizzazione tramite sistemi wireless è un tema molto interessante, in quanto fattore abilitante per varie applicazioni indoor, come l'automazione, la domotica, ed i servizi di tipo AAL (Ambient Assisted Living). L'accuratezza di sistemi di misurazione della distanza basati su tecniche di trasmissione wireless a corto raggio è tuttavia limitata dai fenomeni di multipath causati dagli oggetti e dalle superfici presenti nell’ambiente considerato. L'attività di ricerca descritta in questa memoria è stata incentrata sulla modellazione di tali fenomeni per trasmissioni indoor OQPSK (Offset Quadrature Shift Keying), compatibili con lo standard IEEE 802.15.4. Il modello sviluppato è stato validato sperimentalmente attraverso misurazioni in camera anecoica, e verrà ulteriormente sviluppato in futuro per migliorare l'accuratezza di sistemi di localizzazione indoor basati su trasmissioni wireless
A Servo-Clock Model for Chains of Transparent Clocks Affected by Synchronization Period Jitter
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