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Thèse Année : 2023

Contribution to the development of autonaumous wake-up radios for the efficient energy in wireless devices

Contribution au développement de radios wake-ups autonomes pour une utilisation efficace de l'énergie dans les dispositifs sans fil

Achille Fumtchum
Florin Doru Hutu

Résumé

The work carried out in this thesis focused on the optimization of the energy consumption of connected devices and specifically on their radiofrequency (RF) part. The main objective is to propose standby modes with zero energy consumption. More precisely, it is to propose standby modes which are independent on the main energy souce (battery). The work focused amongst others in energy saving mechanisms such as wake-up radio on the one hand, and on the other hand in radio frequency energy harvesting circuits designed to make them autonomous.To achieve this objective, an exhaustive state of the art of wake-up radio receivers is provided, highlighting their operating frequencies, modulation types, power consumption together with their RF architectures and an assessment of the relationships between these parameters. It is then highlighted some applications ranging from aeronautics to human body communication, including agriculture, security, smart metering, wildlife monitoring, localization and tracking, etc...A new wake-up radio that was developed at the CITI Laboratory of INSA Lyon is introduced, then by using the block by block analysis technique of a system, we contributed to the improvement of the existing circuit, by changing the matching network with rectifier; thereby increased the gain by about 11 % for all cases of identifiers considered. This gain then allows an improvement in the communication range of the system by about 13 meters for the 2.45 GHz frequency. In other places, the radio frequency energy harvesting circuits was investigated as a solution to bring the wake up radio circuit independent on the connected object’s main energy source. It is firstly considered the analysis of the main diodes used in these circuits. This diodes include the HSMS 2850, HSMS 2860 and SMS 7630. Here also there is the consideration of all the topologies of the harvesting circuits, and the efficiency domains of each circuit through parametric simulation and determination of the best performing circuits is investigated. This allowed us to establish with precision the circuit that corresponds to our specific application. This was followed by a comparative analysis using classical analysis tools to determine the influence of the frequency on energy harvesting; with the conclusion that the higher the frequency, the less energy is harvested. Finally, an implementation of the energy harvesting circuit was made and we obtained for the input powers 0 dBm and 15 dBm, respectively 8.3 µW and 138.68 µW. These power levels are more than enough to supply any type of WuRx.
Les travaux réalisés dans le cadre de cette thèse ont porté sur l'optimisation de la consommation d'énergie des appareils connectés et plus particulièrement sur leur partie radiofréquence (RF). L'objectif principal est de proposer des modes de veille avec une consommation d'énergie nulle. Plus précisément, il s'agit de proposer des modes de veille indépendants de la source d'énergie principale (batterie).
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tel-04201610 , version 1 (11-09-2023)

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  • HAL Id : tel-04201610 , version 1

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Achille Fumtchum, Florin Doru Hutu. Contribution to the development of autonaumous wake-up radios for the efficient energy in wireless devices. Computer Science [cs]. University of Buea, 2023. English. ⟨NNT : ⟩. ⟨tel-04201610⟩

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