{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"id":[{"id":"https:\/\/ror.org\/03mb6wj31","id-type":"ROR","asserted-by":"publisher"},{"id":"https:\/\/www.isni.org\/000000041937028X","id-type":"ISNI","asserted-by":"publisher"},{"id":"https:\/\/www.wikidata.org\/entity\/Q1640731","id-type":"wikidata","asserted-by":"publisher"}],"name":"Universitat Polit\u00e8cnica de Catalunya","acronym":["UPC"]}],"indexed":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T11:20:05Z","timestamp":1773919205510,"version":"3.50.1"},"reference-count":0,"publisher":"Universitat Polit\u00e8cnica de Catalunya","license":[{"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-sa\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"abstract":"<jats:p>Powering wireless sensors has become a key challenge to enable the Internet of Things vision. A common approach to achieve this is to use Energy Harvesting. By means of this technology, sensors have access to an unlimited source of energy, which can extend their operation lifetime.\r\nUnfortunately, typically the energy that is available surrounding the sensors is neither controllable nor predictable, showing significant variations in the expected harvested energy in terms of both space and time. This can cause the temporal disconnection of parts of the wireless network. \r\nThe objective of this thesis is to mitigate the undesirable effects of the spatio-temporal variations of the surrounding energy, by following a two-fold approach: first, to provide a high level understanding of the involved trade-offs in the design of a wireless sensor and the interconnecting network. Then, to synthesize an energy field to guarantee the required amount of ambient energy at the surrounding of the considered nodes.\r\nThe first part of the thesis starts by presenting a formal description of the environment. The derived energy model is first used to answer fundamental questions on throughput scaling and, then, to provide design guidelines for energy harvesting sensors. It is found that energy harvesting is a scalable solution to power and recharge IoT sensors, which require additional circuit design to guarantee their operation in energy scarce scenarios.\r\nOn the second part of this work, wireless RF power transmission from controllable Energy Transmitters (ETs) is considered as a feasible approach to synthesize an energy field to power sensors at-a-distance, hence tackling the lack of available ambient energy in spatial regions, at the cost of occupying the available wireless spectrum. Due to the limited transmission range of this approach, the use of multiple ETs to cover entire areas is required. We first discuss on the feasibility of synthesizing energy fields with multiple ETs. We show that powering those sensors with multiple ETs stands as a scalable approach, which presents a trade-off between the channel conditions and the energy multiplexing design complexity. We, then, present an opportunistic scheme to leverage the generated interferences of multiple ETs. Finally, we propose a joint energy and communication method to circumvent the imposed trade-offs of in-band multi-ET wireless RF power transmission. \r\nOverall, we find that the analysis and design of wireless networked sensing systems, enabled by energy harvesting, and the development of novel wireless RF power transmissions schemes will play a key role in the future development of autonomous IoT deployments.<\/jats:p>\n                <jats:p>Alimentar sensores inal\u00e1mbricos se ha convertido en uno de los mayores problemas para permitir la visi\u00f3n de la Internet of Things (IoT). La recolecci\u00f3n de energ\u00eda (energy harvesting) aparece como una tecnolog\u00eda habitual para abordar este problema. A trav\u00e9s de esta, los sensores tienen acceso a una fuente ilimitada de energ\u00eda, que puede extender el tiempo de vida de operaci\u00f3n. Desafortunadamente, la energ\u00eda que est\u00e1 disponible alrededor de los sensores, t\u00edpicamente, no es ni controlable ni predictible. Por lo que exhibe variaciones significativas en la cantidad de energ\u00eda recolectada tanto en t\u00e9rminos espaciales como temporales. As\u00ed, esto puede causar desconexiones temporales de ciertas \u00e1reas o partes de la red inal\u00e1mbrica. El objetivo de esta tesis se centra en reducir los efectos indeseados de las variaciones espacio temporales de la energ\u00eda del ambiente, siguiendo una doble aproximaci\u00f3n: En primer lugar, proporcionar un entendimiento a alto nivel de los compromisos que intervienen tanto en el dise\u00f1o de los sensores inal\u00e1mbricos como de la red que los interconecta. En segundo lugar, sintetizar un campo de energ\u00eda que garantice la cantidad necesaria de energ\u00eda ambiente alrededor de los nodos sensores. As\u00ed, la primera parte de la tesis empieza presentando una descripci\u00f3n formal del entorno. Se proporciona un modelo energ\u00e9tico que se utiliza para responder preguntas fundamentales en referencia a la capacidad de la red y para proporcionar pautas en el dise\u00f1o de los nodos sensores. Tal y como se muestra, la recolecci\u00f3n de energ\u00eda es una soluci\u00f3n escalable para alimentar y recargar los sensores IoT, aunque ellos necesitan circuiter\u00eda y componentes adicionales para garantizar una operaci\u00f3n ininterrumpida. En la segunda parte de este trabajo, la transmisi\u00f3n inal\u00e1mbrica de energ\u00eda desde transmisores de energ\u00eda (ETs, por sus siglas en ingl\u00e9s) se considera una aproximaci\u00f3n viable para sintetizar un campo de energ\u00eda que alimente los nodos sensores. \u00c9ste permite llegar a las regiones del espacio donde no hay suficiente energ\u00eda ambiente, al coste de ocupar parte del espectro radioel\u00e9ctrico. Debido a que el alcance de la transmisi\u00f3n de energ\u00eda est\u00e1 muy limitado, se m\u00faltiples ETs para cubrir \u00e1reas enteras. Primero, se realiza un estudio de viabilidad de s\u00edntesis de campos de energ\u00eda mediante m\u00faltiples ETs. Del estudio, se extrae que el m\u00e9todo es escalable aunque presenta un compromiso entre complejidad en el dise\u00f1o de acceso m\u00faltiple al medio para transmisi\u00f3n de energ\u00eda y calidad del canal. Despu\u00e9s, se presenta un m\u00e9todo oportunista para aprovechar las interferencias entre transmisiones de energ\u00eda con tal de optimizar la recarga de los nodos. Finalmente, proponemos un m\u00e9todo para permitir el acceso simultaneo de energ\u00eda e informaci\u00f3n al espectro de RF. En resumen, el an\u00e1lisis y dise\u00f1o de redes inal\u00e1mbricas de sensores, alimentadas por la recolecci\u00f3n de energ\u00eda y la transmisi\u00f3n inal\u00e1mbrica de energ\u00eda jugaran un papel fundamental en el futuro desarrollo de despliegues de redes aut\u00f3nomas de IoT.<\/jats:p>","DOI":"10.5821\/dissertation-2117-96605","type":"dissertation","created":{"date-parts":[[2023,8,30]],"date-time":"2023-08-30T01:24:08Z","timestamp":1693358648000},"approved":{"date-parts":[[2016,7,22]]},"source":"Crossref","is-referenced-by-count":0,"title":["Enabling the internet of things through energy harvesting : a circuit-aware system synthesis-oriented analysis approach"],"prefix":"10.5821","author":[{"sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ra\u00fcl","family":"Gomez Cid-Fuentes","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"3865","container-title":[],"original-title":[],"deposited":{"date-parts":[[2026,3,19]],"date-time":"2026-03-19T06:28:26Z","timestamp":1773901706000},"score":1,"resource":{"primary":{"URL":"https:\/\/hdl.handle.net\/2117\/96605"}},"subtitle":[],"editor":[{"given":"Eduardo Jos\u00e9","family":"Alarc\u00f3n Cot","sequence":"first","affiliation":[],"role":[{"role":"editor","vocabulary":"crossref"}]},{"given":"Alberto","family":"Cabellos Aparicio","sequence":"additional","affiliation":[],"role":[{"role":"editor","vocabulary":"crossref"}]}],"short-title":[],"issued":{"date-parts":[[null]]},"references-count":0,"URL":"https:\/\/doi.org\/10.5821\/dissertation-2117-96605","relation":{},"subject":[]}}