Welcome to the EnHANTs Project!
In this project we are developing Energy-Harvesting Active Networked Tags (EnHANTs). EnHANTs are small, flexible, and energetically self-reliant devices that can be attached to objects that are traditionally not networked (e.g., books, furniture, walls, doors, toys, keys, clothing, and produce), thereby providing the infrastructure for various novel tracking applications. Examples of these applications include locating misplaced items, continuous monitoring of objects (items in a store, boxes in transit), and determining locations of disaster survivors.
Recent advances in ultra-low-power wireless communications, ultra-wideband (UWB) circuit design, and organic electronic harvesting techniques will enable the realization of EnHANTs in the near future. In order for EnHANTs to rely on harvested energy, they have to spend significantly less energy than Bluetooth, Zigbee, and IEEE 802.15.4a devices. Moreover, the harvesting components and the ultra-low-power physical layer have special characteristics whose implications on the higher layers have yet to be studied (e.g., when using ultra-low-power circuits, the energy required to receive a bit is significantly higher than the energy required to transmit a bit).
The objective of the project is to design hardware, algorithms, and software to enable the realization of EnHANTs. This interdisciplinary project includes 5 PIs in the departments of Electrical Engineering and Computer Science at Columbia University with expertise in energy-harvesting devices and techniques, ultra-low power integrated circuits, and energy efficient communications and networking protocols.
The project is supported in part by:
The EnHANTs testbed was presented by Robert Margolies and Tingjun Chen in a demo session as part of the Data on a Mission: Innovation and Application event hosted by the Columbia University Data Science Institute. As part of the event, Prof. Ioannis Kymissis presented a talk titled "Energy Harvesting for Wake-up, Sensing, and Networking".
Three different papers by EnHANTs project members have been recently published in the IEEE Journal on Selected Areas in Communications (JSAC), special issues on wireless communications powered by energy harvesting and wireless energy transfer (Vol. 33, no. 3 and no. 9, 2015).
2. "Iterative Dynamic Water-Filling for Fading Multiple-Access Channels With Energy Harvesting" - authored by Zhe Wang, Xiaodong Wang and their collaborator Vaneet Aggarwal (Purdue University).
3. "Outage Minimization for a Fading Wireless Link With Energy Harvesting Transmitter and Receiver" - authored by Tingjun Chen and his former advisors and collaborators Sheng Zhou, Wei Chen, and Zhisheng Niu (Tsinghua University).
The EnHANTs project was recently referenced in the Cisco Technology News Site Blog, "the network". The article is titled "The Internet of Everything Goes to School", and discusses efforts to boost educational programs that involve skills related to the Internet of Things (IoT). The EnHANTs project has been a pioneer in educating students on the IoT, with the outcomes of our teaching objectives recently documented in an arXiv report.
The EnHANTs Project and an Interview with Prof. Kinget highlighted in IEEE Communications Technology News
Seven different publications, reports and presentations have been recently contributed by different members of the EnHANTs project:
- IEEE Transaction on Communications: A paper authored by Zhe Wang, Vaneet Aggarwal (Purdue University) and Xiaodong Wang titled “Power allocation for energy harvesting transmitter with causal information” was published on IEEE Transaction on Communications in Nov. 2014.
- ArXiv Report: A technical report titled “Project-based Learning within a Large-Scale Interdisciplinary Research Effort” is on ArXiv. This report by Robert Margolies, Maria Gorlatova, John Sarik, Peter Kinget, Ioannis Kymissis and Gil Zussman describes the EnHANTs project experience in engaging over 80 students over 180 interdisciplinary research projects, and summarizes lessons learned.
- ArXiv Reports: Two technical reports titled “Multiuser Joint Energy-Bandwidth Allocation with Energy Harvesting - Part I: Optimum Algorithm & Multiple Point-to-Point Channels” and “Multiuser Joint Energy-Bandwidth Allocation with Energy Harvesting - Part II: Multiple Broadcast Channels & Proportional Fairness” are on ArXiv. These two reports by Zhe Wang, Vaneet Aggarwal (Purdue University) and Xiaodong Wang study and develop optimal energy-bandwidth allocation algorithms in fading channels and multiple broadcast channels for multiple energy harvesting transmitters.
- SCONES: Jelena Marasevic presented a poster titled “Algorithms for Max-min Fair Rate Assignment and Routing in Energy Harvesting Networks” at the first Symposium on the COntrol of NEtwork Systems (SCONES) held in Boston, in Oct. 2014.
- Columbia University: Guy Grebla presented a poster titled “Movers and shakers: Kinetic energy harvesting for the Internet of things” at the 2014 Columbia University Postdoc Research and Career Symposium. This poster won the Top 10 Poster Award.
- IEEE NJACS: Jelena Marasevic’s poster titled “Algorithms for Max-min Fair Rate Assignment and Routing in Energy Harvesting Networks” won the Second Place Poster Award at the 2nd IEEE North Jersey Advanced Communications Symposium (NJACS) held in Sept, 2014.