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[IEEE IEEE INFOCOM 2019 - IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS) - Paris, France (2019.4.29-2019.5.2)] IEEE INFOCOM 2019 - IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS) - Real-Time Experimental Demonstration of Multi-band CAP Modulation in a VLC System with Off-the-Shelf LEDs
摘要： We demonstrate, for the ?rst time, m-CAP modulation using off-the-shelf LEDs in a VLC in real time experimental setup using ?eld programmable gate arrays based in universal software radio peripherals (USRPs). We demonstrate transmission speeds up to ～30 Mb/s can be achieved, which supports high de?nition television streaming.
关键词： real time,?eld programmable gate array,visible light communications,modulation,Digital signal processing
更新于2025-09-12 10:27:22
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Implementation of a tunable hybrid system with coupled high Q-factor resonators based on mode localization for sensing purposes
摘要： There has been a growing interest in the development of MEMS devices based on Anderson mode localization to increase the sensitivity to mass perturbation in the last decade [1–7]. Mode localization occurs within an array of weakly coupled identical resonators in which a mass or sti?ness perturbation is introduced. The main strengths of mode localization are its high sensitivity to the perturbation and the common mode rejection [8]. However, taking advantage of this phenomenon requires to have an array of perfectly identical resonators and a low coupling sti?ness, but high enough to avoid mode aliasing [9]. As a consequence, microfabrication defects are often an obstacle to the implementation of such sensitive sensors. In addition, the devices geometry and the chosen excited mode are limited by the implementation of the coupling (for instance the ?rst mode of double-ended tuning forks [4] or cantilevers [5]). Therefore, we hereby suggest an alternative with a system based on a ?rst mechanical resonator coupled to a second resonator having a di?erent physical nature that allows to tune it. Such a hybrid approach has already been investigated for MEMS characterization using electrical resonators [10] having a Q-factor of 1000 and we previously demonstrated the possibility to generate modes in a system made of an electrical resonator having a Q-factor of 20 and a digital device [11]. In this work and for the ?rst time to our knowledge, we set up a two-degree-of-freedom (DoF) coupled system made of piezoelectric resonators (QCM) with Q-factors exceeding 105. The coupling and one of the coupled resonators are replaced by their digital equivalent (based on dynamic equations) and implemented in a hardware performing real time calculations. This method enables to tune the design parameters of one resonator and the coupling coe?cient in order to reach the optimal conditions for mode localization, and to get rid of the geometric constraints imposed by the design of the coupling (thus allowing to work with a QCM for instance). Since such piezoelectric resonators are broadly used the ?eld of mass sensors for agro-food, environment, safety or health applications [12], these results pave the way to a new generation of ultrasensitive biosensors.
关键词： ?eld programmable gate array,Tunable hybrid system,weak coupling,quartz crystal microbalance,mode localization,digital resonator
更新于2025-09-12 10:27:22