Research Interests

  • Mobile Systems: Mobile Sensing, Localization, Context-Awareness, Human-Computer Interaction
  • Cloud and Big Data: Cloud Computing, Big Data Analytics, Software-Defined Ecosystem
  • Sensing and Communication: Sensing hardware, Signal Processing, Wireless Communication
  • Internet of Things and Cyber-Physical Systems: Networking, Embedded Systems, IoT Security
  • Social Network and Privacy: Mobile Social Network, Crowd Sourcing/Sensing, Location/Big Data/Media Privacy


  • Designed and developed multiple working systems (hardware, software) from scratch.
  • Multiple NSF Grant Applications (Entrepreneurial Leader for NSF I-Corps).
  • The representative (No.1) team award for the NSF I-Corps cohort (Bay Area, Winter)
  • Published 15 papers, signed one book contract (CRC Press).
  • Filed 3 patents (3 technology licensees), another 2 in application.
  • 4.0 GPA with the certificate of Outstanding Achievement three times.
  • 2013 and 2014 Apple WWDC Student Scholarship winner.
  • 2014 Innovator Award from the Office of Technology Licensing (OTL) at the University of Florida.
  • Supervised >30 graduate students; Engineering Entrepreneurial Supervision (>12 students).
  • Ranked No.1 with “Guorui” scholarship during M.S.; Recipient of National Scholarship of China in 2007.


Nanjing University of Science & Technology (NUST) Electrical Engineering B.S.,   2004-2008
University of Science and Technology of China (USTC) Electrical Science & Technology M.S., 2008-2011
University of Florida (UF) Electrical & Computer Engineering M.S., 2011-2013
University of Florida (UF) Electrical & Computer Engineering Ph.D., 2011-now

Working Experiences

  • 2014 Summer Internship, Mitsubishi Electric Research Laboratories, Cambridge, MA
    • Working on task and sleep scheduling, IPv6 based energy-efficient routing for Internet of Things (IoT) (submitted one patent and one paper)


Mobile Systems

  1. Guoguo: Enabling Smartphone-based Fine-grained Indoor Localization, Project Leader. [More]
    • a) A complete smartphone sensing ecosystem (code-named Guoguo) from ground-up to fill the long-lasting gap of indoor localization with centimeter-level accuracy.
    • b) Consists of a set of miniature indoor positioning satellites (IPS), an app on a smartphone for opportunistic beacon sensing, and a cloud server for offloading heavy processing, location services and content management.
    • c) Four papers accepted, one patent licensed by three companies; System video demo in MobiSys 2013, Taipei.
  1. NSF I-Corps: Commercialization Feasibility Research and Implementation for Smartphone Localization via Indoor Positioning Satellites and Opportunistic Sensing, Entrepreneurial Leader. [More]
  2. InAR: Smartphone on Steroids with Indoor Augmented Reality, Project Leader. [More]
    • a) Smartphone-based indoor augmented reality includes accurate attitude, pose and location estimation, sensor fusion approaches via computer vision.

Cloud and Big Data

  1. GatorCloud: SDN-enabled Campus Cloud (Funded by over $2M from NSF) [More]
    • a) First SDN-enabled campus cloud on the fastest campus networks with 200Gbps gateway to the Internet2.
    • b) Cloud Infrastructure design via Openstack and Openflow.
    • c) Big data analytic engine design based on Hadoop and Spark.
  1. NSF GemsCloud: A GENI-Federated Cyber-Physical System with Multi-Modalities [More]
    • a) Enhance the NSF GENI platform (global environment for network innovation) with richer modalities, including sensors, robots, and RFIDs.
  1. CloudGC: A Scalable Algorithm for Complex Graph Clustering, Project Leader. [More]
    • a) Scalable clustering algorithm based on Hadoop and Mahout platform.
    • b) Large scale community detection for Twitter (obtained results within 8h for 40 million users).

Social Network and Privacy

  1. ToGathor: The Mobile Social Network with Missions, Project Leader. (Funded by NSF) [More]
    • a) We design a hybrid cyberphysical mobile social network (wearable tags, cyber-physical groups and high scalability cloud server) that uses the physical properties in an interactive, reactive, and proactive manner beyond the conventional static manner.
    • b) One patent filed; applied NSF STTR grant; Start-up company: ToGathor LLC
  1. Mobile Crowd Sourcing/Sensing (MCS), Project Leader. [More]
    • a) Leveraging crowds of smartphone and our own designed wearable tag, we target the application of finding and locating the lost child in crowds via Mobile Crowd Sensing.
    • b) One paper accepted: IEEE MASS14
  1. Improving Location Service via Social Collaboration, Project Leader. [More]
    • a) One paper accepted: IEEE MASS13
  1. iShare: Enabling Private Media Sharing in the Clouds, Project Leader.
    • a) We propose to design efficient and privacy-preserving solutions (collectively called iShare) to achieve format-compliant, compression-independent and correlation-preserving for media sharing/storing issues in big data, clouds, and mobile platforms.
    • b) One paper accepted; One paper submitted; Applied Google Faculty Award.

Health and Emergency Care

  1. VitalCloud: Weaving a Pervasive Life Network for Healthcare [More]
    • a) Integrate hardware, software, and advanced algorithms to solve: 1) Active Sensing and Data Fusion with MIMO Micro-Radars; 2) Design mixed cooperative sensing algorithms; 3) Build the VitalCloud hardware and software testbed; 4) Design and implement the VitalCloud runtime management system and services.
  1. UWB Through-the-wall Detection and Communication System Demonstration, 863 High-Tech Program, MOST of China, No.2009AA011204. [More]
    • a) Lead the team on hand-held through-the-wall Ultra-Wideband (UWB) radar network design and implementation for searching and rescuing disaster victims.
    • b) One demo system (8 stations), five papers accepted, one patent.

Internet of Things and Cyber-Physical Systems

  1. Battery-aware energy-efficient routing for Internet of Things (IoT), Mitsubishi Electric Research Laboratories
    • a) Worked on task and sleep scheduling, IPv6 based energy-efficient routing.
    • b) Submitted one paper and one patent.
  1. Development of UWB SOC and Demo Test-Bed, 863 High-Tech Program, MOST of China, No.2007AA01Z2B2. [More]
    • a) Built a high-speed digital signal processing platform (32Gbps) featuring parallel FPGA and DSP that lead to China’s first UWB network and SOC.
  1. Research on Impulse Radio Mono-bit Receiver, Supported by National Nature Science Foundation of China (NSFC), No. 60802008.
    • a) Designed a novel UWB receiver architecture for compact hybrid communication and radar devices.
    • b) Three papers accepted, one patent.
  1. Performance Evaluation and Optimization of Multi-core ARM and DSP Architecture, Project Leader. [More]
    • a) Porting Android to Beagleboard via TI C6EZ; Exploit the DSP, NEON and ARM for computation optimization.


  1. Liu, K., Li, M. and Li, X. (2015) “Hiding Media Data via Shaders: Enabling Private Sharing in the Clouds.” The 8th IEEE International Conference on Cloud Computing (CLOUD 2015). (Accepted, acceptance: 17%).
  2. Liu, K., and Li, X. (2015) “Enabling Context-Aware Indoor Augmented Reality via Smartphone Sensing and Vision Tracking,” ACM Transactions on Multimedia Computing, Communications, and Applications (TOMM). (Accepted)
  3. Liu, K., and Li, X. (2014) “FindingNemo: Locating Lost Children via Mobile Crowd Sensing.” IEEE Trans on Computers (TC) (under review).
  4. Liu, K., Liu, X., and Li, X. (2014) “Guoguo: Enabling Fine-grained Smartphone Localization via Acoustic Anchors.” IEEE Trans on Mobile Computing (TMC). [pdf]
  5. Liu, K., and Li, X. (2014) “FindingNemo: Finding Your Lost Child in Crowds via Mobile Crowd Sensing.” The 11th IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS 2014), Philadelphia, Pennsylvania. (Acceptance: 48/181 = 26.5%) [pdf]
  6. Liu, K., Huang, Q., et al, (2013) “Improving GPS Service via Social Collaboration.” The 10th IEEE International Conference on Mobile Ad-hoc and Sensor Systems (MASS 2013), Hangzhou, China. (Acceptance: 55/186 = 29.6%) [IEEE Xplore] [pdf]
  7. Liu, K., Liu, X.,  and Li, X. (2013) “Guoguo: Enabling Fine-grained In-door Localization via Smartphone.” The 11th ACM International Conference on Mobile Systems, Applications, and Services (MobiSys 2013), Taipei, Taiwan. (Acceptance: 33/210 = 15.7%) [ACM Library] [pdf]
  8. Liu, K., and Li, X. (2013) “Guoguo: Smartphone-based High-precision Indoor Location Ecosystem and Services.” MobiSys 2013 Ph.D Forum, Taipei, Taiwan. [pdf]
  9. Liu, X.,  Liu, K., Guo, L., Li, X., and Fang., Y, A Game-Theoretic Approach for Achieving k-Anonymity in Location Based Services, The 32nd IEEE International Conference on Computer Communications (INFOCOM 2013). (Acceptance: 280/1613 = 17.4%)
  10. Liu, K., Li, X., et al, (2013) “Towards Accurate Acoustic Localization on a Smartphone.” The 32st IEEE International Conference on Computer Communications (INFOCOM 2013) Mini-Conference, Turin, Italy. (Acceptance: 21%) [IEEE Xplore] [pdf]
  11. Liu, K., Liu, X.,  and Li, X. (2012) “Acoustic Ranging and Communication via Microphone Channel.” IEEE GLOBECOM 2012, Anaheim California, USA. (Acceptance: 966/2560 = 37.7%) [IEEE Xplore] [pdf]
  12. Liu, K., Yin, H., and Chen, W. (2011) “Low Complexity Tri-level Sampling Receiver Design for UWB Time-of-Arrival Estimation.” in Proc. Int. Conf. Communication(ICC2011), Kyoto, Japan. (Acceptance: 1093/2838 = 38.5%) [IEEE Xplore] [pdf]
  13. Liu, K., Xu, H., et al, (2010) “Odd-Symmetry Template Based Three-Step Detector for IR-UWB Detection.” in Proc. Int. Conf. Ultra-Wideband(ICUWB2010), Nanjing, China, Sep. 2010, vol. 2, pp. 615-618. [IEEE Xplore] [pdf]
  14. Liu, K., Xu, H., Chen, W., “Finite-Resolution Receiver Performance for IR-UWB Target Detection.” in Proc. Int. Conf. Signal Processing and Communication Systems(ICSPCS2010), Gold Coast, Australia, Dec. 2010. [IEEE Xplore] [pdf]
  15. Liu, K., Ren, J, et al, (2010) “A Practical UWB TOA Estimator in the Presence of Interference and NLOS.” in Proc. Int. Conf. Signal Processing(ICSP2010), Beijing, China, Oct. 2010. [IEEE Xplore] [pdf]
  16. Xu, H., Liu, K., Ma Yunfei, Wang Dongjin, Chen Weidong, “An Improved IPCP Detector of UWB Radar Signals Based on Adaptive Searching Window,” in Proc. Int. Conf. Ultra-Wideband(ICUWB2010), Nanjing, China, Sep. 2010.
  17. Xu, H., Liu, K., Wang Dongjing, Chen Weidong, “The Effect of Timing Jitter to the Radar Detection Performance,” in Journal of Science and Technology of China (ISSN 0253-2778), 2011. (In Chinese)
  18. Hao, J., Liu, K., Jingjing Ren, Guanghua Lu, Weidong Chen, “IR-UWB radar signal sampling and reconstruction based on step-delay pulses,” Electrical and Control Engineering (ICECE), Sept. 2011.


  1. Li, X., Liu, K., “Apparatus, method, and software systems for smartphone-based fine-grained indoor localization,” (WO 2014089040 A1) (Licensed by three companies). [Google Patent] [WIPO] [News]
  2. Li, X., Liu, K., “Dynamic User-Defined Check-In Points,” No. 62/066,436. [Filing Receipt]
  3. Guo, J., Liu, K., et al, “Energy Efficient Management of Heterogeneous Multi-Hop Wireless Network,” MERL-2789
  4. Li, X., Liu, K., “Apparatus and Method for Indoor Positioning Satellites,” UF# 14496.
  5. Liu, K., et al,“Receiving apparatus for ultra wideband impulse signal and ultra wideband impulse radar system,”(CN 102360070 B). [Google Patent] [Chinese]

Awards and Grants

  1. The representative (No.1) team award for the 2015 NSF I-Corps cohort (Bay Area, Winter).
  2. 2014 Innovator Award from the Office of Technology Licensing (OTL) at the University of Florida.
  3. Apple WWDC Student Scholarship, 2013 and 2014.
  4. Travel Grant from the ACM MobiSys 2013, Taipei, Taiwan.
  5. Travel Grant from the IEEE MASS 2013 and 2014.
  6. Certificate of Outstanding Achievement, University of Florida International Center, 2014, 2013, 2012.
  7. The 14, 15, 16th GENI Engineering Conference Travel Grant
  8. National Scholarship of China.
  9. “Guorui” Scholarship in EEIS of USTC.
  10. Excellent Graduate Student of NUST.
  11. Outstanding Student Scholarship (NUST) — three times.
  12. “Spansion” Scholarship.

Teaching Experience

  1. Supervision of Independent Study at UF (more than 20 Master students)
  2. Project Supervision of Guoguo, ToGathor, GatorCloud, GEMSCloud, VitalCloud at UF (more than 25 members in total)
  3. Technical Advisor for an undergraduate startup project (One CEO, six engineering students, six business students)
  4. Administrating Apple University Program at UF, lecturing and instructing iOS programming for Master students
  5. Teaching assistant for Cyber-Physical Systems, Cloud Computing and Storage at UF
  6. Teaching assistant for Circuit Design, Wireless Communication at USTC
  7. National Project (million level) Supervision at USTC for IR-UWB SOC and Demonstration (more than 15 students)

Synergistic Activities

  1. TPC Member for the Data Center & Big Data track, the 24th International Conference on Computer Communications and Networks.
  2. Reviewer for IEEE Journal on Selected Areas in Communications (IEEE JSAC) (2014)
  3. Reviewer for IEEE Internet of Things Journal (IEEE IoT) (2014)
  4. Reviewer for IEEE TMC 2014, TPDS 2013, TWireless 2012
  5. Reviewer for INFOCOM 2015, 2014, 2013
  6. Reviewer for UbiComp 2013, GLOBECOME 2013, PECON 2012, MASS 2012


  • Software Design: Objective C and Swift, C#, C++/C, MATLAB, Java, NesC, TCL(OTCL), PHP, Python, AWK.
  • Platform: iOS/Android, ns2(ns3), Apache Hadoop, Apache Spark, Kafaka, MySQL, MongoDB, CoachDB, Redis, Sliex Micro-Framework, Amazon AWS, Apache Mahout, Microsoft .NET.
  • Hardware Design: Cadence Allegro, Protel/Altium Schematic and PCB Design, FPGA, VHDL, DSP and ARM, MSP430, CCS, Embedded Real-time OS, Android/Linux Customize, SYS/BIOS, BLE, OpenWRT.