# Romit Roy Choudhury

Romit Roy Choudhury
Professor, Electrical and Computer Engineering
(217) 300-7577
croy@illinois.edu
263 Coordinated Science Lab

## For More Information

- Website

## Education

- Ph.D., Computer Science, University of Illinois at Urbana-Champaign, 2006

## Biography

Romit Roy Choudhury is the Gilmore Family Endowed Professor of ECE at the University of Illinois at Urbana Champaign (UIUC). He joined UIUC from Fall 2013, prior to which he was an Associate Professor at Duke University. Romit received his PhD in the CS department of UIUC in Fall 2006. His research interests are in sensing, signal processing, and machine learning, with applications to mobile and wearable computing. Along with his students, he received a few research awards, including the 2017 ACM MobiSys Best Paper Award, the 2016 CS@UIUC Distinguished Alumni Award, the 2015 ACM Sigmobile Rockstar Award, the 2009 Hoffmann Krippner Award for Engineering Innovations, 2007 NSF CAREER Award, etc. Romit was elected as an IEEE Fellow in 2019 and serves as an Amazon Scholar since 2022. Visit Romit's Signals and Inference Research Group (SiNRG) at http://sinrg.csl.illinois.edu

## Academic Positions

- Amazon Scholar, Amazon, 2022 - present
- Visiting Principle Scientist, Samsung AI Center (SAIC), Cambridge, UK, Fall 2019.
- Visiting Researcher, Intel, Santa Clara, Summer 2016
- Associate Professor, ECE and CS, Duke University, 2011 to 2013
- Visiting Researcher, Microsoft Research, Redmond, Summer 2010
- Assistant Professor, ECE and CS, Duke University, 2006 to 2011.

## Documents

- updated-CV

## Other Professional Activities

- Research Group: http://synrg.ee.duke.edu/index.htm
- Homepage: http://croy.web.engr.illinois.edu/

## Other Undergraduate Advising Activities

- Feedback Friday (a forum for PhD students to receive research feedback from a panel of Computer Engineering faculty)

## Research Statement

Romit's research interests are at the intersection of machine learning and signal processing with applications to mobile sensing, IoT, and data-driven inference.

## Research Interests

- Sensing and Signal Processing, Machine Learning, Generative Models, Wearable/Earable/Mobile Computing,

## Research Areas

- Artificial Intelligence
- Systems and Networking

## Articles in Conference Proceedings

- Using Directional Antennas for Medium Access Control in Ad Hoc Networks, Romit Roy Choudhury, X. Yang, Ram Ramanathan and Nitin Vaidya, ACM MobiCom 2002
- Deafness: A MAC Problem in Ad Hoc Networks when using Directional Antennas, Romit Roy Choudhury, Nitin Vaidya, IEEE ICNP 2004
- Micro-Blog: Sharing and Querying Content through Mobile Phones and Social Participation, Shravan Gaonkar, Jack Li, Romit Roy Choudhury, Landon Cox, Al Schmidt, ACM MobiSys 2008
- Hiding Stars with Fireworks: Location Privacy through Camouﬂage, J. Meyerowitz, R. Roy Choudhury, ACM MobiCom 2009
- CSMA/CN: Carrier Sense Multiple Access with Collision Notiﬁcation, Souvik Sen, Romit Roy Choudhury, Srihari Nelakuditi, ACM MobiCom 2010
- ”Did You See Bob?”: Human Localization using Mobile Phones, Ionut Constandache, Xuan Bao, Martin Azizyan, Romit Roy Choudhury, ACM MobiCom 2010
- Successive Interference Cancellation: A Back-of-the-Envelope Perspective, Souvik Sen, Naveen Santhapuri, Romit Roy Choudhury, Srihari Nelakuditi, ACM Hotnets 2010
- Listen (on the Frequency Domain) Before You Talk, Souvik Sen, Romit Roy Choudhury, Srihari Nelakuditi, ACM Hotnets 2010
- TagSense: A Smartphone based Approach to Automatic Image Tagging, Chuan Qin, Xuan Bao, Romit Roy Choudhury, Srihari Nelakuditi, ACM MobiSys 2011
- Avoiding the Rush Hours: WiFi Energy Management for Mobile Devices, Justin Manweiler, Romit Roy Choudhury, ACM MobiSys 2011, Nominated for Best Paper Award
- No Time to Countdown: Backing Off in the Frequency Domain, Souvik Sen, Romit Roy Choudhury, Srihari Nelakuditi, ACM MobiCom 2011
- Precise Indoor Localization using PHY Layer Information, Souvik Sen, Bozidar Radunovic, Romit Roy Choudhury, Tom Minka, ACM Hotnets 2011
- Satellites in Our Pockets: An Object Positioning System using Smartphones, Justin Manweiler, Romit Roy Choudhury, ACM MobiSys 2012
- Spot Localization using PHY Layer Information, Souvik Sen, Bozidar Radunovic, Romit Roy Choudhury, ACM MobiSys 2012
- No Need to War-Drive: Unsupervised Indoor Localization, He Wang, Souvik Sen, Ahmed Elgohary, M. Farid, Moustafa Youssef, Romit Roy Choudhury, ACM MobiSys 2012
- Cooperative Packet Recovery in Enterprise WLANs, Mahanth Gowda, Souvik Sen, Romit Roy Choudhury, Sung-Ju Lee, IEEE Infocom 2013
- Your Reactions Suggest You Like the Movie: Automatic Content Rating using Reaction Sensing, Xuan Bao, Songchun Fan, Romit Roy Choudhury, Alex Varshavsky, Kevin Li, ACM UbiComp 2013
- AccelPrint: Imperfections of Accelerometers Make Smartphones Trackable, Sanorita Dey, Nirupam Roy, Wenyuan Xu, Romit Roy Choudhury, Srihari Nelakuditi, NDSS 2014
- I am a Smartphone and I can Tell my Users Walking Direction, Nirupam Roy, He Wang, Romit Roy Choudhury, ACM MobiSys 2014
- Backing Out of Linear Backoff in Wireless Networks, Mahanth Gowda, Nirupam Roy, Romit Roy Choudhury, Srihari Nelakuditi, ACM HotWireless 2014
- Infrastructure Mobility: A What-If Analysis, Mahanth Gowda, Nirupam Roy, Romit Roy Choudhury, ACM Hotnets 2014
- SemanticSLAM: Using Environment Landmarks for Unsupervised Indoor Localization, H. Abdelnasir, R. Samir, A. Elgohary, M. Alzantot, H. Wang, S. Sen, R. Roy Choudhury, M. Youssef, IEEE Transactions on Mobile Computing, 2015.
- Indoor Localization: Experiences and Lessons Learnt, Dimitrios Lymberopoulos, Jie Liu, Souvik Sen, Xue Yang, Romit Roy Choudhury, Vlado Handziski, ACM/IEEE IPSN 2015
- OverLay: Practical Mobile Augmented Reality,Puneet Jain, Justin Manweiler, Romit Roy Choudhury, ACM MobiSys 2015
- Visual Addressing and Applications, He Wang, Xuan Bao, Romit Roy Choudhury, Srihari Nelakuditi, ACM MobiSys 2015
- Your Daily Activity is Your Password, Sourav Dandapat, Swadhin Pradhan, Bivas Mitra, Romit Roy Choudhury, Niloy Ganguly, ACM CHI 2015
- Communicating through Physical Vibrations, Nirupam Roy, Mahanth Gowda, Romit Roy Choudhury, ACM NSDI 2015
- Experiences with eNav: A Low-power Vehicular Navigation System, Shaohan Hu, Lu Su, Shen Li, Shiguang Wang, Chenji Pan, Siyu Gu, Md Tanvir Amin, Hengchang Liu, Suman Nath, Romit Roy Choudhury, Tarek F. Abdelzaher, ACM UbiComp, September 2015.
- MoLe: Motion Leaks through Smartwatch Sensors, He Wang, Ted Tsung-Te Lai, Romit Roy Choudhury, ACM MobiCom, September 2015.
- Ripple II: Faster Communications through Physical Vibrations, Nirupam Roy, Romit Roy Choudhury, NSDI, March 2016.
- If WiFi APs Could Move: A Measurement Study, Mahanth Gowda, Ashutosh Dhekne, Romit Roy Choudhury, WWW, April 2016.
- I am a Smartwatch and I can Track my User’s Arm, Sheng Shen, He Wang, Romit Roy Choudhury, ACM MobiSys, June 2016.
- Listening through a Vibration Motor, Nirupam Roy, Romit Roy Choudhury, ACM MobiSys, June 2016.
- AutoLabel: Labeling Places from Pictures and Websites, Rufeng Meng, Sheng Shen, Romit Roy Choudhury, Srihari Nelakuditi, ACM UbiComp, September 2016.
- Tracking Drone Orientation with Multiple GPS Receivers, M. Gowda, J. Manweiler, A. Dhekne, R. Roy Choudhury, J. Weisz, ACM MobiCom, October 2016.
- Compressing Backoff in CSMA Networks, Mahanth Gowda, Nirupam Roy, Romit Roy Choudhury, Srihari Nelakuditi, IEEE ICNP, November 2016.
- Low Bandwidth Offload for Mobile AR, Puneet Jain, Justin Manweiler, Romit Roy Choudhury, ACM CoNEXT, December 2016.
- DroneNet: Using Drones as Cell Tower Extensions, Ashutosh Dhekne, Mahanth Gowda, Romit Roy Choudhury, ACM HotMobile 2017
- Bringing IoT to Sports Analytics, Mahanth Gowda, Sheng Shen, Ashutosh Dhekne, Romit Roy Choudhury, NSDI, March 2017
- BackDoor: Making Smartphones Hear Inaudible Sounds, Nirupam Roy, Haitham Hassanieh, Romit Roy Choudhury, ACM MobiSys, June 2017
- BackDoor: Making Microphones Hear Inaudible Sounds, Nirupam Roy, Haitham Hassanieh, Romit Roy Choudhury, ACM MobiSys, June 2017. (Best Paper Award)
- If WiFi APs Could Move: A Measurement Study, Ashutosh Dhekne, Mahanth Gowda, Romit Roy Choudhury, Srihari Nelakuditi, IEEE Transactions on Mobile Computing, 2018.
- Inaudible Voice Commands: The Long-Range Attack and Defense, Nirupam Roy, Sheng Shen, Haitham Hassanieh, Romit Roy Choudhury, NSDI, April 2018
- LiquID: A Wireless Liquid IDentifier, Ashutosh Dhekne, Mahanth Gowda, Yixuan Zhao, Haitham Hassanieh, Romit Roy Choudhury, ACM MobiSys, June 2018.
- MUTE: Bringing IoT to Noise Cancellation, Sheng Shen, Nirupam Roy, Junfeng Guan, Haitham Hassanieh, Romit Roy Choudhury, ACM SIGCOMM, Aug 2018.
- GhostBuster: Detecting Passive Eavesdroppers, Anadi Chaman, Haitham Hassanieh, Romit Roy Choudhury, ACM MobiCom, Oct 2018
- Closing the Gaps in Inertial Motion Tracking, Sheng Shen, Mahanth Gowda, Romit Roy Choudhuryt, ACM MobiCom, Oct 2018
- Many-to-Many Beam Alignment in Millimeter Wave Networks, Suraj Jog, Jiaming Wang, Junfeng Guan, Thomas Moon, Haitham Hassanieh, Romit Roy Choudhury, Usenix NSDI 2019
- Voice Localization Using Nearby Wall Reflections, Sheng Shen, Daguan Chen, Yu-Lin Wei, Zhijian Yang, Romit Roy Choudhury, ACM MobiCom, September 2020.
- Ear-AR: Indoor Acoustic Augmented Reality on Earphones, Zhijian Yang, Yu-Lin Wei, Sheng Shen, Romit Roy Choudhury, ACM MobiCom, September 2020.
- EarSense: Earphones as a Teeth Activity Sensor, Jay Prakash, Zhijian Yang, Yu-Lin Wei, Haitham Hassanieh, Romit Roy Choudhury, ACM MobiCom, September 2020
- Earable Computing: A New Area to Think About, Romit Roy Choudhury, ACM HotMobile, Feb 2021.
- Angle-of-arrival (AOA) Factorization in Multipath Channels, Yu-Lin Wei, Romit Roy Choudhury, IEEE ICASSP, June 2021.
- Personalizing Head Related Transfer Functions for Earables, Zhijian Yang, Romit Roy Choudhury, ACM SIGCOMM, Aug 2021.
- Learning to Separate Voices by Spatial Regions, Zhongweiyang Xu, Romit Roy Choudhury, ICML, Jul 2022.
- RoSS: Rotation-induced Aliasing for Audio Source Separation, Hyungjoo Seo, Sahil Bhandary Karnoor, and Romit Roy Choudhury, ICRA, Jan 2023.
- Self-Supervised Speech Denoising with Multi-Modal Data, Yu-Lin Wei, Rajalaxmi Rajagopalan, Bashima Islam, Romit Roy Choudhury NeurIPS Workshop on ML for Audio, Dec 2023.
- Audio Personalization through Human-in-the-loop Optimization, Rajalaxmi Rajagopalan, Yu-Lin Wei, Romit Roy Choudhury NeurIPS Workshop on ML for Audio, Dec 2023.
- Sample-Constrained Black Box Optimization for Audio Personalization, Rajalaxmi Rajagopalan, Yu-Lin Wei, Romit Roy Choudhury AAAI, Feb 2024.

## Teaching Honors

- Campus List of Teachers Ranked as Excellent by their Students, Fall 2021
- Campus List of Teachers Ranked as Excellent by their Students, Fall 2020
- Campus List of Teachers Ranked as Excellent by their Students, Fall 2019
- Campus List of Teachers Ranked as Excellent by their Students, Fall 2018
- Campus List of Teachers Ranked as Excellent by their Students, Fall 2017
- Campus List of Teachers Ranked as Excellent by their Students, Fall 2015

## Research Honors

- Paper selected to ACM Research Highlights for 2018
- 2018 Google Faculty Research Award
- Best Paper Award, ACM MobiSys 2017
- Named Jerry Sanders III AMD Inc. Scholar, 2017
- 2016 Distinguished Alumni Award from the Department of CS, UIUC
- 2015 ACM Sigmobile Rockstar Award
- 2015 IBM Faculty Research Award
- Honorable Mention for the Best Paper Award, ACM UbiComp 2013
- Google Faculty Research Award, 2013
- Hoffmann Krippner Engineering Innovations Award, 2009
- NSF Career Award, 2007

## Recent Courses Taught

- CS 438 (ECE 438) - Communication Networks
- CS 591 WN - Wireless Networking Seminar
- ECE 101 - Exploring Digital Info Technol
- ECE 434 (CS 434) - Real World Algorithms - IoT/DS
- ECE 498 RC3 (ECE 498 RC4) - Smartphone Computing and Appli

## Related News

Amazon and the University of Illinois Urbana-Champaign announce funded research projects
University of Illinois-Urbana-Champaign Launches IMMERSE to Enable Computing's Next Frontier
Illinois Center for Immersive Computing Proposal Receives Investment for Growth Funding
Roy Choudhury Receives SIGMOBILE RockStar Award

## News Notes