Prof. Dr. Ambuj Varshney

About Me

I am an Assistant Professor at the National University of Singapore.

Contact Details

I am located at Computing 3(COM3). My address is: #02-25, Computing 3, School of Computing, 11 Research Link, Singapore 119391. Email: ambujv@nus.edu.sg, Phone: +65 - 86706948

Background

You can read more about me in the background section.

ABB and the National University of Singapore have also featured me, potentially providing insights into my background and interests: (ABB Featured artice)(English)(Swedish), and (NUS Featured Article)(English)

Interests

We are interested in wireless embedded systems. We like to engineer systems, often at the intersection of electronics, communication and computer science.

Our group is involved in two major directions; ExaHal and STICORS, which are supported by Beyond RF.

Mentorship

Postdoctoral scholars

  1. Manoj Gulati[PhD from IIIT Delhi and Researcher@University of Washington, Seattle]

Doctoral scholars

  1. Pramuka Sooriyapatabandige
  2. Rajashekar Reddy

Some of my mentored students have defended their doctoral dissertation:

Wenqing Yan[Uppsala University, Sweden][Co-supervised with Thiemo and Christian]

Research Assistant/Predoctoral scholar

  1. Dhairya Jigar Shah

Undergraduates, Visiting Students and Alumni

You can find more about them here.

Service

Served as a member of jury or other significant roles in the following events:

Part of jury for 2022 ABB Research Award in Honour of HvG. Other members were:

Involved in the organizational role of the following events:

Part of the technical program committee (TPC) of the following scientific conferences:

Involved in reviewing of articles for the following journals:

Publications

These are only a selected list of publications. A detailed enumeration of my published work can be found here.

Year 2024

  1. LiFi for Low-Power and Long-Range RF Backscatter
    Authors: Muhammad Sarmad, Borja Genoves, Ambuj Varshney, Domenico Giustiniano.
    IEEE Transactions on Networking 2024

Year 2023

  1. TunnelLiFi: Bringing LiFi to Commodity Internet of Things Devices
    Authors: Muhammad Sarmad Mir, Wenqing Yan, Prabal Dutta, Domenico Giustiniano, and Ambuj Varshney
    The Twenty-fourth International Workshop on Mobile Computing Systems and Applications (ACM HotMobile) 2023

  2. Beyond Broadcasting: Revisiting FM Frequency-band for Providing Connectivity to Next Billion Devices
    Authors: Rajashekar Reddy Chinthalapani, Manoj Gulati, Ambuj Varshney
    The Eleventh International Workshop on Energy Harvesting and Energy-Neutral Sensing Systems (ACM ENSsys 2023) (Co-located with ACM SenSys)

  3. Rethinking Embedded Sensor Data Processing and Analysis with Large Language Models: Poster Abstract
    Authors: Pramuka Medaranga, Steven Waskito, Li Kunjun, Leow Kai Jie, Shantanu Chakrabarty, Ambuj Varshney
    The Twenty First ACM International Conference on Mobile Systems, Applications, and Services (ACM MobiSys) 2023

  4. An Educational Platform to Learn Radio Frequency Wireless Communication: Demo Abstract
    Authors: Tobias Mages, Wenqing Yan, Ambuj Varshney , Christian Rohner
    The Twenty First ACM International Conference on Mobile Systems, Applications, and Services (ACM MobiSys) 2023
    Best Demonstration Award (Featured on National University of Singapore website)

  5. Going Beyond Backscatter: Rethinking Low-Power Wireless Transmitters using Tunnel Diodes: Poster
    Authors: Moteen Shah, Adithya Bijoy, Manoj Gulati, Wenqing Yan, Ambuj Varshney
    The Twenty Ninth Annual International Conference On Mobile Computing And Networking (ACM MobiCom) 2023
    WINNER (First place, Undergraduate) at the ACM Student Research Competition
    (Featured on ACM)

  6. Otter: Simplifying Embedded Sensor Data Collection and Analysis using Large Language Models: Poster
    Authors: Steven Waskito, Kai Jie Leow, Pramuka, Tejas Gupta, Shantanu Chakrabarty, Manoj Gulati, Ambuj Varshney
    The Twenty Ninth Annual International Conference On Mobile Computing And Networking (ACM MobiCom) 2023
    WINNER (Third place, Undergraduate) at the ACM Student Research Competition
    (Featured on ACM)

Year 2022

  1. Making Low-power and Long-range Wireless Backscatter Transmitters
    Author: Ambuj Varshney
    ACM GetMobile: Mobile Computing and Communications (Maker Edition) 2022
    Featured in editorial written by Landon Cox (Microsoft Research): Editorial

  2. Judo: Addressing the Energy Asymmetry of WES through Tunnel Diode based Wireless Transmitters
    Authors: Ambuj Varshney, Wenqing Yan, Prabal Dutta
    The Twentieth ACM International Conference on Mobile Systems, Applications, and Services (ACM MobiSys 2022)
  3. PassiveLiFi: Rethinking LiFi for Low-Power and Long Range RF Backscatter
    Authors: Muhammad Sarmad, Borja Genoves, Ambuj Varshney, Domenico Giustiniano
    The Twenty Seventh Annual International Conference On Mobile Computing And Networking (ACM MobiCom 2021/2022)
    Covered extensively in media: Hackster, El Mundo (Largest newspaper in Spain), Stacey on IoT, TechXplore, AzoSensors, ElectronicsForu ….

Year 2021

  1. Securing Battery-free Backscatter Tags through Fingerprinting
    Authors: Revathy Narayanan, Ambuj Varshney, et al.
    The Twentieth ACM Workshop on Hot Topics in Networks (ACM HotNets 2021)

  2. Radio frequency communication device for low power communication
    Ambuj Varshney (Only inventor)
    [PCT/Patent Application] [WO2021040594A1]

Year 2020

  1. TunnelEmitter:Tunnel Diode based Low-Power Carrier Emitters for Backscatter Tags
    Authors: Ambuj Varshney, Lorenzo Corneo
    The Twenty Sixth Annual International Conference On Mobile Computing And Networking (ACM MobiCom 2020)
  2. Two to Tango: Hybrid Light and Backscatter Networks for Next Billion Devices
    Authors: Ambuj Varshney, Ander Galiesto, Domenico Giustiniano
    Co-primary author that contributed equally to the work
    The Eighteenth ACM International Conference on Mobile Systems, Applications, and Services (ACM MobiSys 2020)

Year 2019

  1. TunnelScatter: Low Power Communication for Sensor Tags using Tunnel Diodes
    Authors: Ambuj Varshney, Andreas Soleiman, Thiemo Voigt
    The Twenty Fifth Annual International Conference On Mobile Computing And Networking (ACM MobiCom 2019)

Year 2018

  1. Connecting Battery-free IoT Tags Using LED Bulbs
    Authors: Domenico Giustiniano, Ambuj Varshney, Thiemo Voigt
    The Eighteenth ACM Workshop on Hot Topics in Networks (ACM HotNets 2019)

  2. Demonstration: Towards Battery-free Radio Tomographic Imaging
    Authors: Abdullah Hylamia, Ambuj Varshney, Andreas Soleiman, et al.
    The Eleventh ACM Conference on Security and Privacy in Wireless and Mobile Networks (ACM WiSec-2018)
    Best Demonstration Award

  3. Battery-free 802.15.4 Receiver
    Authors: Carlos Perez Penichet, Claro Noda, Ambuj Varshney, Thiemo Voigt
    The Seventeenth ACM/IEEE Conference on Information Processing in Sensor Networks.(ACM/IEEE IPSN 2018)

  4. Enabling Sustainable Networked Embedded Systems
    Ambuj Varshney, Doctoral dissertation
    Awarded the 2019 ABB Research Award in Honour of HvG (with grant of 300k USD)
    Press release from Uppsala University
    Press release from ABB

Year 2017

  1. LoRea: A Backscatter Architecture that Achieves a Long Communication Range
    Authors: Ambuj Varshney, Oliver Harms, Carlos Penichet, Christian Rohner , Frederik Hermans, Thiemo Voigt
    Fifteenth ACM Conference on Embedded Networked Sensor Systems (ACM SENSYS 2017)
    Fundamental part of Winning contribution to 2019 ABB Research Award in Honour of HvG

  2. Battery-free Visible Light Sensing
    Authors: Ambuj Varshney, Andreas Soleiman, Luca Mottola, Thiemo Voigt
    ACM VLCS (Co-located with ACM MobiCom) 2017
    Best Paper Award

  3. Battery-free Visible Light Sensing: Poster
    Authors: Andreas Soleiman, Ambuj Varshney, Luca Mottola, Thiemo Voigt
    The Twenty Third Annual International Conference On Mobile Computing And Networking (ACM MobiCom 2017)
    WINNER (First place, Graduate) at the ACM Student Research Competition Featured on ACM

  4. Towards wide-area backscatter networks
    Authors: Ambuj Varshney, Carlos Perez Penichet, Christian Rohner, Thiemo Voigt
    ACM HotWireless (Co-located with ACM MobiCom) 2017

Year 2016

  1. modBulb: A Modular Light Bulb for Visible Light Communication
    Authors: Kasun Hewage, Ambuj Varshney, Abdalah Hilamia, Thiemo Voigt
    ACM VLCS (Co-located with ACM MobiCom) 2016

  2. Augmenting IoT Networks with Backscatter-Enabled Passive Sensor Tags
    Authors: Carlos Perez Penichet, Frederik Hermans, Ambuj Varshney, Thiemo Voigt
    ACM HotWireless (Co-located with ACM MobiCom) 2016

Year 2015

  1. Directional Transmissions and Receptions for High-throughput Bulk Forwarding in Wireless Sensor Networks
    Authors: Ambuj Varshney, Luca Mottola, Mats Carlsson, Thiemo Voigt
    Thirteenth ACM Conference on Embedded Networked Sensor Systems (ACM SENSYS 2015)
  2. dRTI: Directional Radio Tomographic Imaging
    Authors: Bo Wei, Ambuj Varshney, Wen Hu, Neal Patwari, Thiemo Voigt, Chun Tung Chou
    The Fourteenth ACM/IEEE Conference on Information Processing in Sensor Networks(ACM/IEEE IPSN 2015)