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Lingjia Liu, Ph.D.


Profile Lingjia Liu, Ph.D.
Professor, Bradley Department of Electrical and Computer Engineering
Associate Director, Wireless@Virginia Tech
Virginia Tech, Blacksburg, VA, USA

Elected Member, Executive Committee
National Spectrum Consortium

439 Durham Hall
1145 Perry Street, Blacksburg, VA, USA
Phone: (540) 231-7243
Email: ljliu AT vt dot edu

Research Interests:

  • Enabling technologies for 5G and Beyond networks
    • 3D massive/FD-MIMO systems
    • Cooperative routing and multi-user scheduling
    • Cloud-RAN (CRAN) and interference alignment
    • Ultra-low latency communications
  • Machine learning and its application to communication networks
    • Big data driven communications and networking
    • Reservoir computing for communication systems
    • Demand and response for smart grid networks
    • Attack detection in smart grid networks
  • Network of everything
    • Device-to-device (D2D) & machine-type-communications (MTC)
    • Privacy/security protection for cyber-physical systems (CPS)
    • Spectrum sensing & dynamic spectrum access (DSA)
    • Energy-harvesting for internet of things (IoT)

Short Bio:

Lingjia Liu received the Bachelor of Science (B.S.) degree with the highest honor in Electronic Engineering Department from Shanghai Jiao Tong University, Shanghai, China, and completed his Doctor of Philosophy (Ph.D.) degree at Texas A&M University in Electrical and Computer Engineering. He spent the summer of 2007 and spring of 2008 in the Mitsubishi Electric Research Laboratory. Prior to joining the ECE Department at Virginia Tech (VT), he was an Associate Professor in the EECS Department at the University of Kansas (KU). He spent 3+ years working in the Standards & Mobility Innovation Lab of Samsung Research America (SRA) where he got Global Samsung Best Paper Award twice (in 2008 and 2010 respectively). He was a technical leader and a leading 3GPP RAN1 standard delegate from Samsung on downlink MIMO, Coordinated Multipoint (CoMP) transmission/reception, device-to-device (D2D) communications, and Heterogeneous Networks (HetNets). He was elected as the New Faces of Engineering 2011 by the Diversity Council of the National Engineers Week Foundation and was recognized during the 2011 National Asian American Engineers of the Year Awards Banquet in Seattle (News Release in Dallas Morning News). From 2013 to 2017, he has been continuously selected as U.S. Air Force Office of Scientific Research (AFOSR)/Air Force Research Laboratory (AFRL) summer faculty fellow. In May 2015, he received the Miller Professional Development Award for Distinguished Research at KU.

Lingjia Liu is a member of the Phi Kappa Phi honor society and a senior member of IEEE. He is currently serving as an Associate Editor of the IEEE Transactions on Neural Networks and Learning Systems as well as the EURASIP Journal on Wireless Communications and Networking. He was an Editor of IEEE Transactions on Wireless Communications (TWireless) from 2012 to 2017, an Editor of the IEEE Transactions on Communications (TCom) from 2015 to 2017. He has been serving as the Technical Program Committee Chair of 7 consecutive IEEE GLOBECOM Workshops on Emerging Technologies for 5G ('12-'18). He served as the Vice-Chair, Americas of the IEEE Technical Committee on Green Communications & Computing (TCGCC) from 2017 to 2019. Currently, he is an Elected Member of Executive Committee of National Spectrum Consortium and an Elected Member of the IEEE Signal Processing Society SPCOM Technical Committee.

Lingjia Liu has 200+ publications including 3 book chapters, 80+ journal publications, 5 editorials, and 90+ conference papers. He has numerous technical contributions to major 4G standards including both 3GPP LTE/LTE-Advanced and IEEE 802.16m. He has 20+ granted U.S. patents with 20+ pending applications, and 10+ essential intellectual property rights (IPRs) in major 4G standards. His research receives including 8 Best Paper Awards (2020 Charles K. Kao Best Paper Award, 2018 IEEE TAOS Best Paper Award, 2016 IEEE GLOBECOM Best Paper Award, etc). Currently, his research is sponsored by Air Force Research Laboratory, Air Force Office of Scientific Research, Intel, National Science Foundation, National Spectrum Consortium, Qualcomm, and Samsung Research America. His research efforts have been supported in part by over $90 M in research funding, with Lingjia Liu serving as the principal investigator (PI) on close to $9 M federal research grants (personal share $6+ M).

What's New:

Available positions: research assistant positions are available for self-motivated Ph.D. students who are interested in conducting research on the topic of signal processing, machine learning and networking for Spring/Fall 2022 (click for details).

Things happened in our group after the pandemic!

[Paper Acceptance] August 22, 2021: Our paper, Delay-aware Resource Allocation in Fog-assisted IoT Networks Through Reinforcement Learning, has been accepted to IEEE Internet Things J. (IOTJ) Congratulations Qiang and Jianan!

[Grant] August 9, 2021: “Collaborative Research: SWIFT: Intelligent Dynamic Spectrum Access (IDEA): An Efficient Learning Approach to Enhancing Spectrum Utilization and Coexistence” has been awarded by the National Science Foundation (NSF). This is a collaborative project with a total budget of $750K. Dr. Lingjia Liu is serving as the PI from the leading institution of this project. Dr. Zhi Tian from ECE@George Mason is serving as the PI from the collaborative institution.

[Ph.D. Defense] August 3, 2021: Our group member, Hao-Hsuan Chang, successfully defended his Ph.D. dissertation and becomes Dr. Chang. Congratulations Dr. Chang! The title of Hao-Hsuan's dissertation is “Deep Reinforcement Learning for Next Generation Wireless Networks with Echo State Networks”. He is the 11th Ph.D. graduated from our group. He will be joining Samsung Research America as a Senior Research Engineer.

[Paper Acceptance] July 21, 2021: Our paper, Differential Privacy Meets Federated Learning under Communication Constraints, has been accepted to IEEE Internet Things J. (IOTJ) Congratulations Nima, Jianan, Qiang and Yifei!

[Paper Acceptance] June 30, 2021: Our paper, UAV Swarm Enabled Aerial Reconfigurable Intelligent Surface (SARIS), has been accepted to IEEE Wireless Commun. (WCM) Congratulations Bodong and Rubayet!

[Grant] June 24, 2021: “5G Low Probability of eXploitation (5G LoPX)” has been awarded by Lockheed Martin Corporation (LMCO). Dr. Lingjia Liu is serving as the Co-PI of the project (Dr. Daniel Jakubisin is serving as the PI). The total budget is $300,00.

[Ph.D. Defense] June 21, 2021: Our group member, Zhou (John) Zhou, successfully defended his Ph.D. dissertation and becomes Dr. Zhou. Congratulations Dr. Zhou! The title of John's dissertation is “Machine Learning-Based Receiver in Multiple Input Multiple Output Communications Systems”. He is the 10th Ph.D. graduated from our group. He will be joining Apple as a Senior Wireless Research Engineer.

[Paper Acceptance] June 8, 2021: Our paper, Computing over the Space-Air-Ground Integrated Network (SAGIN): Fundamentals, Challenges and Opportunities, has been accepted to IEEE Netw. Mag. Congratulations Bodong!

[Grant] June 3, 2021: “Overshadowing Attacks in 5G Systems: Launching and Detecting” has been awarded by CCI. Dr. Lingjia Liu is serving as the PI of the project. The total budget is $50,000.

[Grant] June 3, 2021: “Portable Outdoor 5G Testbed: A Resource for Wireless/Cybersecurity/UAV Research” has been awarded by CCI. Dr. Lingjia Liu is serving as the Co-PI of the project (Dr. Carl Dietrich is serving as the PI). The total budget is $149,753.

[Paper Acceptance] May 28, 2021: Our paper, Learning-Assisted Energy-Efficient Computation Offloading for Vehicular Edge Computing Systems, has been accepted to IEEE Trans. Veh. Technol. (TVT) Congratulations Bodong!

[Service] May 26, 2021: Dr. Lingjia Liu has been elected as a member of Promotion and Tenure (P&T) Committee within the ECE Dept. at Virginia Tech.

[Service] May 21, 2021: Dr. Lingjia Liu has been elected as the Chair of Sidelink Task Force within the 5G Working Group of National Spectrum Consortium.

[Grant] May 14, 2021: Our group received $80K grant to work on Machine Learning for Adaptive OFDM Waveform Design from Samsung Research America (SRA)! Dr. Lingjia Liu is serving as the sole PI of this project.

[Paper Acceptance] May 14, 2021: Our paper, Interference Alignment Meets Multi-cell Multi-user Massive FD-MIMO Systems in DoA-based Precoding, has been accepted to IEEE Trans. Wireless Commun. (TWireless) Congratulations Nan and Rubayet!

[Paper Acceptance] May 9, 2021: Our paper, Reliability versus Latency for Random Network Coding-Enabled Networks, has been accepted to IEEE Commun. Lett. Congratulations Bodong, Antonio and Bowen!

[Paper Acceptance] May 3, 2021: Our paper, Multi-agent Reinforcement Learning Meets Random Access in Massive Cellular Internet of Things (IoT), has been accepted to IEEE Internet Things J. (IOTJ) Congratulations Jianan and Antonio!

[Grant] April 23, 2021: “Distributed Coherent MIMO Communications” has been awarded by NSC. Dr. Lingjia Liu is serving as the sole PI of the project from Virginia Tech. The total budget is $466,074. This is part of $13 million CCI 5G project.

[Promotion] April 23, 2021: Dr. Lingjia Liu has been promoted to Professor at Virginia Tech.

[Invited Talk] April 23, 2021: Dr. Lingjia Liu is invited to give a seminar on the topic of “AI-Inspired Wireless Communications: Reservoir Computing Meets MIMO-OFDM” to Prof. Andrea Goldsmith's group in both Princeton and Stanford.

[Dean's Award] April 22, 2021: Dr. Lingjia Liu has been selected to receive the Dean's Award for Excellence in Research from the College of Engineering.

[Paper Acceptance] April 4, 2021: Our paper, Cooperative Caching in HetNets with Mutual Information Accumulation, has been accepted to IEEE Netw. Lett. Congratulations to Junchao and Bodong!

[Paper Acceptance] April 2, 2021: Our paper, Spatial-Temporal Hybrid Neural Network with Computing-in-Memory Architecture, has been accepted to IEEE Trans. Circuits Syst. I. (TCAS-I)!

[Summer Intern] April 1, 2021: Our group members, Lianjun Li, Yibin (Donald) Liang, Bodong Shang, and Shashank Jere will start their research intern positions in Samsung Research America (Plano, TX Office), Samsung Research America (Mountain View, CA Office), Nokia Bell Labs, and Intel Labs. Wish them a nice and productive summer of 2021.

[Grant] March 26, 2021: “Scalable Top-down Security Design for 5G Networks” has been awarded by Deloitte. Dr. Lingjia Liu is serving as the Co-PI of the project (Dr. Ying Wang is serving as the PI). The total budget is $400,000.

[Grant] March 8, 2021: “Enhancing 5G Wireless Network Security with Reconfigurable Intelligent Surfaces” has been awarded by CCI. George Mason University is the leading institution of the joint effort. Dr. Lingjia Liu is serving as the PI from Virginia Tech. The total budget of the project is $220,000.

[Ph.D. Defense] Feb 25, 2021: Our group member, Hao (Antonio) Song, successfully defended his Ph.D. dissertation and becomes Dr. Song. Congratulations Dr. Song! The title of Antonio's dissertation is “Swarm Unmanned Aerial Vehicle Networks in Wireless Communications: Routing Protocol, Multicast, and Data Exchange”. He is the 9th Ph.D. graduated from our group. He will be joining Intel Research as a Research Scientist.

[New Member] January 10, 2021: Yifei joined our group as a PhD student. Welcome on board!

[Paper Acceptance] January 6, 2021: Our paper, A Deep Reinforcement Learning Framework for Spectrum Management in Dynamic Spectrum Access, has been accepted to IEEE Internet Things J. (IOTJ) Congratulations Antonio!

[Paper Acceptance] January 4, 2021: Our paper, RCNet: Incorporating Structural Information into Deep RNN for Online MIMO-OFDM Symbol Detection with Limited Training, has been accepted to IEEE Trans. Wireless Commun. (TWireless). Congratulations Zhou and Shashank!

[Qualcomm Innovation Fellowship] December 18, 2020: Two of our group's teams have been selected for full proposal for Qualcomm Innovation Fellowship (QIF). The topics are “A Sample-Efficient Deep Reinforcement Learning Framework for 5G Dynamic Spectrum Access and Dynamic Spectrum Sharing” and “Deep Reinforcement Learning Meets Resource Allocation in Radio Access Network (RAN) Slicing”. Only three teams from Virginia Tech are selected to move to the full proposal stage and two of them are from our group! Congratulations Hao-Hsuan, Jiarui, Emad and Nima!

[Paper Acceptance] December 14, 2020: Our paper, Energy Efficient MIMO-OFDM Spectrum Sensing Using Deep Stacked Spiking Delayed Feedback Reservoir Computing, has been accepted to IEEE Trans. Green Commun. and Netw. (TGCN). Congratulations Kian!

[Grant] December 14, 2020: “Open Programmable Secure 5G (OPS-5G)” has been awarded by DARPA. Perspecta Labs is leading the effort. Dr. Lingjia Liu is serving as the Co-PI of the subcontract from Virginia Tech (Dr. Haining Wang is serving as the PI). VT's share is $457,659.

[M.S. Defense] December 10, 2020: Our group member, Jianan Bai, successfully defended his M.S. thesis. Congratulations Jianan!

[Paper Acceptance] December 4, 2020: Our paper, Enhanced Flooding-Based Routing Protocol for Swarm UAV Networks: Random Network Coding Meets Clustering, has been accepted to IEEE INFOCOM 2021. Congratulations Antonio and Bodong!

[Paper Acceptance] November 28, 2020: Our paper, A Cost-Efficient Digital ESN Architecture on FPGA for OFDM Symbol Detection, has been accepted to ACM Journal on Emerging Technologies in Computing Systems (JETC). Congratulations Donald and Lianjun!

[Grant] November 17, 2020: “Agile Waveform Design for Communication Networks in Contested Environments” has been awarded as a University Center of Excellence (UCoE) by AFRL/AFOSR. Dr. Robert Calderbank is the leading PI and Duke University is the leading institution. The UCoE will have 8 researchers from Duke, ASU, CMU, CSU, Princeton, and Virginia Tech. Dr. Lingjia Liu is serving as the PI from the Virginia Tech and will be serving on the Steering Committee of the UCoE. VT's share is $1,181,001. News release from Duke can be found here.

[Grant] November 17, 2020: “5G Enabled Smart Farms through Secure and Intelligent Wireless Sensors” has been awarded by Commonwealth Cyber Initiative (CCI) under Southwest Virginia Research, Innovation, & Workforce Development Program. Dr. Lingjia Liu is serving as the Co-PI of this project and Dr. Hwajung (Joan) Lee from Radford University is serving as the PI of the project.

[Paper Acceptance] November 13, 2020: Our paper, A Cross-Layer Optimization Framework for Distributed Computing in IoT Networks, has been accepted to ACM/IEEE Symposium on Edge Computing EdgeComm Workshop. Congratulations Bodong!

[Paper Acceptance] November 13, 2020: Our paper, Quantized Reservoir Computing on Edge Devices for Communication Applications, has been accepted to ACM/IEEE Symposium on Edge Computing EdgeComm Workshop. C

[Paper Acceptance] November 3, 2020: Our paper, Learning with Knowledge of Structure: A Neural Network-Based Approach for MIMO-OFDM Detection, has been accepted to Asilomar 2021. Congratulations Zhou and Shashank!

[Paper Acceptance] November 3, 2020: Our paper, Learning for Integer-Constrained Optimization through Neural Networks with Limited Training, has been accepted to NeurIPS Learning Meets Combinatorial Algorithms (LMCA) Workshop. Congratulations Zhou and Shashank!

[ExComm of NSC] October 5, 2020: Dr. Lingjia Liu has been elected to the Executive Committee of National Spectrum Consortium!

[Paper Acceptance] September 24, 2020: Our paper, Deep Echo State Q-Network (DEQN) and Its Application in Dynamic Spectrum Sharing for 5G and Beyond, has been accepted to IEEE Trans. Neural Netw. & Learning Syst. (TNNLS) Congratulations Hao-Hsuan!

[Qualcomm Academic Lecture] September 16, 2020: Dr. Lingjia Liu delivered an invited Academic Lecture to Qualcomm on the title of “Brain-Inspired Wireless Communications: Reservoir Computing Meets MIMO-OFDM”!

[Qualcomm Innovation Fellowship] August 28, 2020: Donald and Kangjun have been selected to received the prestigious Qualcomm Innovation Fellowship (QIF) with a grant of $100K. Congratulations Donald and Kangjun!

[Paper Acceptance] August 26, 2020: Our paper, Random Network Coding Enabled Routing Protocol in Unmanned Aerial Vehicle Networks, has been accepted to IEEE Trans. Wireless Commun. (TWireless) Congratulations Antonio!

[New Member] August 10, 2020: Nima and Jiarui joined our group as PhD students. Welcome on board!

[Paper Acceptance] August 04, 2020: Our paper, Spatial Spectrum Sensing in Uplink Two-Tier User-Centric Deployed HetNets, has been accepted to IEEE Trans. Wireless Commun. (TWireless) Congratulations Bodong!

[Paper Acceptance] July 24, 2020: Our paper, On the Fundamental Tradeoffs between Video Freshness and Video Quality in Real-time Applications, has been accepted to IEEE Internet Things J. (IOTJ) Congratulations Junchao and Antonio!

[EdgeComm] June 21, 2020: Dr. Lingjia Liu will be serving as the Workshop co-Chair of the 1st International Workshop on Edge Computing and Communications (EdgeComm), in conjunction with the 5th ACM/IEEE Symposium on Edge Computing (SEC 2020). The webpage of the workshop can be found here. Please consider submitting your contributions!

[Visitor Return] June 4, 2020: Nan Qu finished her visit in our group and returned back to China. All the best to Nan!

[Grant] May 26, 2020: “Collaborative Research: MLWiNS: Deep Neural Networks Meet Physical Layer Communications – Learning with Knowledge of Structure” has been awarded by the National Science Foundation (NSF) and Intel under grant NSF/CNS-2003059. This is a medium collaborative project with a total budget of $810K. Dr. Lingjia Liu is serving as the PI from the leading institution of this project. Dr. Lizhong Zheng from EECS@MIT is serving as the PI from the collaborative institution.

[Paper Acceptance] May 19, 2020: Our paper, MIMO Spectrum Sensing for Cognitive Radio-Based Internet of Things, has been accepted to IEEE Internet Things J. (IOTJ) Congratulations Mingqian!

[Summer Intern] May 18, 2020: Our group members, Lianjun Li, Hao (Antonio) Song, and Zhou Zhou will start their research intern positions in Samsung Research America and Mitsubishi Electric Research Lab. Wish them a nice and productive summer of 2020.

[Grant] May 15, 2020: “Preliminary Research and Multi-University Proposal Development for Efficient Measurement of Spectrum Sharing and Cognitive Radio Network Intelligence and Performance” has been awarded by Commonwealth Cyber Initiative (CCI) under Southwest Virginia Collaboration Grant. Dr. Lingjia Liu is serving as the Co-PI of this project and Dr. Carl Dietrich is serving as the PI of the project.

[Paper Acceptance] May 14, 2020: Our paper, 3D Spectrum Sharing for Hybrid D2D and UAV Networks, has been accepted to IEEE Trans. Commun. (TCOM) Congratulations Bodong!

[Ph.D. Defense] May 12, 2020: Our group member, Kian Hamedani, successfully defended his Ph.D. dissertation and becomes Dr. Hamedani. Congratulations Dr. Hamedani! The title of Kian's dissertation is “Energy Efficient Deep Spiking Recurrent Neural Networks: A Reservoir Computing-Based Approach”. He is the 8th Ph.D. graduated from our group.

[Best Paper Award] May 2, 2020: Our paper, Reservoir Computing Meets Wi-Fi in Software Radios: Neural Network-based Symbol Detection using Training Sequences and Pilots, received Charles K. Kao Best Paper Award at The 29th Wireless and Optical Communications Conference (WOCC 2020). This is a joint collaboration among our group, Samsung Research America, and Air Force Research Laboratory. Congratulations Lianjun!

[Grant] May 1, 2020: Our group received $80K support to work on AI-Enabled Wireless: From Receive Processing to Multi-user Scheduling from Samsung Research America (SRA)! Dr. Lingjia Liu is serving as the sole PI of this project.

[Paper Acceptance] April 20, 2020: Our paper, Moving Toward Intelligence: Detecting Symbols on 5G Systems Through Deep Echo State Network, has been accepted to IEEE Trans. Emerg. Sel. Topics Circuits Syst (ETCAS) Congratulations Kangjun, Zhou, and Shashank!

[Paper Acceptance] March 30, 2020: Our paper, Accelerating Model Free Reinforcement Learning with Imperfect Model Knowledge in Dynamic Spectrum Access, has been accepted to IEEE Internet Things J. (IOTJ) Congratulations Lianjun, Jianan, and Hao-Hsuan!

[Qualcomm Innovation Fellowship] March 27, 2020: Donald and Kangjun's abstract on “A Low-Power Hybrid Neural Processing Architecture for Mobile Edge Itelligent Computing” has been selected as the Finalist for Qualcomm Innovation Fellowship (QIF). Congratulations Donald and Kangjun!

[Paper Acceptance] March 27, 2020: Our paper, Mobile Edge Computing in the Sky: A Hybrid Air and Ground Network, has been accepted to IEEE Internet Things J. (IOTJ) Congratulations Bodong!

[Paper Acceptance] March 4, 2020: Our paper, Scalable Video Transmission in Cache-aided Device-to-Device Networks, has been accepted to IEEE Trans. Wireless Commun. (TWireless) Congratulations Junchao, Antonio, Rubayet and Bodong!

[Paper Acceptance] March 3, 2020: Our paper, Spectrum Sharing for UAV Communications: Spatial Spectrum Sensing and Open Issues, has been accepted to IEEE Veh. Technol. Mag. (VTM) Congratulations Bodong!

More news can be found HERE.

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