Perennially Operating IoT through Wireless Energy Transfer
Kaushik R. Chowdhury
Department of Electrical and Computer Engineering
Northeastern University, Boston, MA
Prof. Kaushik R. Chowdhury received the PhD degree from the Georgia Institute of Technology, Atlanta, in 2009. He is currently Associate Professor and Faculty Fellow in the Electrical and Computer Engineering Department at Northeastern University, Boston, MA. He was awarded the Presidential Early Career Award for Scientists and Engineers (PECASE) in Jan. 2017 by President Obama, the DARPA Young Faculty Award in 2017, the Office of Naval Research Director of Research Early Career Award in 2016, and the NSF CAREER award in 2015. He received multiple best paper awards, including the IEEE INFOCOM conference in 2018, ICC conference, in 2009, ’12 and ’13, and ICNC conference in 2013. His works have gathered over 9700 citations. His current research interests include machine learning for radios, networking for unmanned aerial systems, wireless RF energy harvesting and IoT and in the area of intra/on-body communication. He is a co-director for the Platforms for Advanced Wireless Research project office, a joint $100 million public-private partnership between the US National Science Foundation and a wireless industry consortium to create city-scale testing platforms.
This talk describes recent advances in designing IoT systems and protocols for contactless wireless charging using radio frequency (RF) waves. It explores the fundamental tradeoffs that exist between achieving high data and recharging rates, constructive mixing of radiated signals through beamforming, MAC protocols that allow differential data/energy access, and the promise of simultaneous transfer of data over energy. We also show how the same harvesting circuits can be engineered to serve as wake-up radios, thereby allowing sensors to be activated from a deep-sleep state on-demand. For indoor scenarios, we show how energy transfer can coexist with existing WiFi standards, which also re-use the same unlicensed band. For outdoor scenarios, we present our experiences of charging and waking-up sensors purely from ambient cellular signals.