Liang Liu     刘亮

Assistant Professor
Department of Electronic and Information Engineering
The Hong Kong Polytechnic University
Office: DE605
Tel: +852 2766 3542     Fax: +852 2362 8439
Email: liang-eie.liu@polyu.edu.hk

Dr. Liang LIU received the B.Eng. degree from the School of Electronic and Information Engineering at Tianjin University in 2010, and the Ph.D. degree from the Department of Electrical and Computer Engineering at National University of Singapore (NUS) in 2014. He was a postdoctoral fellow at University of Toronto from 2015 to 2017, and a research fellow at NUS from 2017 to 2019. Currently, he is an assistant professor in the Department of Electronic and Information Engineering at The Hong Kong Polytechnic University (PolyU). His research interests include wireless communications and networking, advanced signal processing and optimization techniques, and Internet-of-Things (IoT).

Dr. Liang LIU is the recipient of the 2017 IEEE Signal Processing Society Young Author Best Paper Award, and the best paper award for 2011 International Conference on Wireless Communications and Signal Processing (WCSP). He was listed in Highly Cited Researchers, also known as World's Most Influential Scientific Minds, by Clarivate Analytics (Thomson Reuters) in 2018.

Dr. Liang LIU' CV and research profiles can be found at: My CV, ResearcherID, ORCID, Google Scholar Citations, ResearchGate Profile

Important Announcement:

[1] Call for paper: IEEE Wireless Communications Special Issue on Massive Machine-Type Communications for IoT. More information can be found at CFP.
[2] Prof. Wei Yu and I will give a tutorial on massive machine-type communications at Globecom 2020.

News

[05/2019] We preseted our work about new framwork for channel estimation in intelligent reflecting surface assisted communication systems at WCNC2020. Video
[05/2019] We preseted our work about intelligent reflecting surface assisted massive MIMO at SPAWC2020. Video
[04/2020] We organized a special issue about "Massive Machine-Type Communications for IoT" on IEEE Wireless Communications. Please see CFP.
[05/2019] I joined the Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, as an assistant professor. A new journey began!
[09/2018] I was listed as a 2018 Highly Cited Researcher by Clarivate Analytics (Thomson Reuters).
[09/2018] Our magazine article "Sparse signal processing for grant-free massive connectivity: A future paradigm for random access protocols in the Internet of Things" was published in IEEE Signal Processing Magazine, special issue on Signal Processing and the Internet of Things.
[12/2017] I won 2017 IEEE Signal Processing Society Young Author Best Paper Award, for the paper coauthored with Jie Xu and Rui Zhang, for "Multiuser MISO beamforming for simultaneous wireless information and power transfer," IEEE Trans. Signal Process., vol. 62, no. 18, pp. 4798-4810, Aug. 2014. Cheers.
[11/2017] An invited book chapter, entitled "Transmit beamforming for simultaneous wireless information and energy transfer", was published. (Book URL)
[05/2017] I gave an invited talk entitled "Massive Connectivity Meets Massive MIMO" at University of Science and Technology of China.
[03/2017] I gave an invited talk entitled "Massive Connectivity Meets Massive MIMO" at Tsinghua University.
[03/2017] An invited book chapter, entitled "Fronthaul-aware design for cloud radio-access networks", was published. (Book URL)
[07/2015] I attended my Ph.D Commencement Ceremony at NUS. Cheers.
[09/2014] I gave an invited talk entitled "Joint power control and fronthaul rate allocation for throughput maximization in broadband cloud radio access network" at ShanghaiTech University.

Research

Research Interests


* Massive Connectivity for Internet-of-Things (IoT) (Publications)
  • Grant-free random access
  • Compressed sensing for device activity detection
  • Massive MIMO for massive connectivity



* Intelligent Reflecting Surface Assisted Communications (Publications) * Ultra-Reliable and Low Latency Communications (URLLC) (Publications)
  • Factory automation for Industry 4.0
  • URLLC for Drones



* Unmanned Aerial Vehicles (UAVs) Communications (Publications)
  • Uplink communications: interference control for terrestrial communications
  • Downlink communications: URLLC to control UAVs



* Cloud Radio Access Network (C-RAN) (Publications)
  • Data compression, quantization, and routing over fronthaul links
  • Joint design of wireless links and fronthaul links



* Wireless Power Transfer (WPT) (Publications)
  • Simultaneous wireless information and power transfer
  • Wireless powered communication networks



* Multiuser MIMO (Publications)
  • Interference channel, broadcast channel, multiple-access channel
  • Beamforming design



Research Projects


* Start-up Fund of PolyU, PI, HK$ 300,000, "Machine-Type Communications for Future Internet of Things and Industry 4.0," 2019-2022.

* RGC Early Career Scheme (ECS) (25215020), PI, HK$ 776,432, "Towards Massive Connectivity in Next-Generation Wireless Networks," 2020-2023.


Research Team


PhD Students

* Qipeng Wang (Bachelor degree from Harbin Institute of Technology)

Postdoc

* Zhaorui Wang




Publications

Book Chapters


  • L. Liu, W. Yu, and O. Simone, "Fronthaul-aware design for cloud radio access networks," in the chapter of Emerging Technologies for 5G Wireless Systems, Cambridge University Press, 2017. (Book URL)
  • L. Liu, J. Xu, and R. Zhang, "Transmit beamforming for simultaneous wireless information and energy transfer," in the chapter of Library in Signal Processing, New York: Academic Press, 2017. (Book URL)

Journal Papers (ArXiv Public Identifier)


L. Liu, Y. Liu, P. Patil, and W. Yu, "Uplink-downlink duality between multiple-access and broadcast channels with compressing relays," submitted to IEEE Trans. Inf. Theory. (Available: arXiv)
♣ Z. Wang, L. Liu, and S. Cui, "Channel estimation for intelligent reflecting surface assisted multiuser communications: framework, algorithms, and analysis," IEEE Trans. Wireless Commun., vol. 19, no. 10, pp. 6607-6620, Oct. 2020. (Available: arXiv) (Matlab Code)
♣ Z. Wang, L. Liu, and S. Cui, "Intelligent reflecting surface design for 6G-assisted Internet of Things," Chinese Journal on Internet of Things. vol. 4, no. 2, pp. 84-95, Jun. 2020.
♣ Y. Han, L. Liu, L. Duan, and R. Zhang, "Towards reliable UAV swarm communication in D2D-enhanced cellular network," to appear in IEEE Trans. Wireless Commun.. (Available: arXiv)
L. Liu, S. Zhang, and R. Zhang, "Multi-beam UAV communication in cellular uplink: cooperative interference cancellation and sum-rate maximization," IEEE Trans. Wireless Commun., vol. 18, no. 10, pp. 4679-4691, Oct. 2019. (Available: arXiv)
L. Liu, S. Zhang, and R. Zhang, "CoMP in the sky: UAV placement and movement optimization for multi-user communications," IEEE Trans. Commun., vol. 67, no. 8, pp. 5645-5658, Aug. 2019. (Available: arXiv)
♣ Q. Wu, L. Liu, and R. Zhang, "Fundamental trade-offs in communication and trajectory design for UAV-enabled wireless network," IEEE Wireless Commun., vol. 26, no. 1, pp. 36-44, Feb. 2019. ESI Highly Cited Paper (Available: arXiv)
L. Liu, E. G. Larsson, W. Yu, P. Popovski, C. Stefanovic, and E. de Carvalho, "Sparse signal processing for grant-free massive connectivity: A future paradigm for random access protocols in the Internet of Things," IEEE Signal Process. Mag., vol. 35, no. 5, pp. 88-99, Sep. 2018. (Available: arXiv)
L. Liu and W. Yu, "A D2D-based protocol for ultra-reliable wireless communications for industrial automation," IEEE Trans. Wireless Commun., vol. 17, no. 8, pp. 5045-5058, Aug. 2018. (Available: arXiv)
L. Liu, P. Patil, and W. Yu, "Channel diagonalization for cloud radio access," IEEE Wireless Commun. Lett., vol. 7, no. 4, pp. 622-625, Aug. 2018. (Available: arXiv)
L. Liu and W. Yu, "Massive connectivity with massive MIMO-Part II: Achievable rate characterization," IEEE Trans. Signal Process., vol. 66, no. 11, pp. 2947-2959, Jun. 2018. (Available: arXiv)
L. Liu and W. Yu, "Massive connectivity with massive MIMO-Part I: Device activity detection and channel estimation," IEEE Trans. Signal Process., vol. 66, no. 11, pp. 2933-2946, Jun. 2018. ESI Highly Cited Paper (Available: arXiv) (Matlab Code)
L. Liu and W. Yu, "Cross-layer design for downlink multihop cloud radio access networks with network coding," IEEE Trans. Signal Process., vol. 65, no. 7, pp. 1728-1740, Apr. 2017. (Available: arXiv)
L. Liu and R. Zhang, "How to diagonalize a MIMO channel with arbitrary transmit covariance?," IEEE Wireless Commun. Lett., vol. 5, no. 4, pp. 352-355, Aug. 2016. (Available: arXiv)
♣ H. Xing, L. Liu, and R. Zhang, "Secrecy wireless information and power transfer in fading wiretap channel," IEEE Trans. Veh. Technol., vol. 65, no. 1, pp. 180-190, Jan. 2016. ESI Highly Cited Paper (Available: arXiv)
L. Liu, S. Bi, and R. Zhang, "Joint power control and fronthaul rate allocation for throughput maximization in OFDMA-based cloud radio access network," IEEE Trans. Commun., vol. 63, no. 11, pp. 4097-4110, Nov. 2015. (Available: arXiv)
L. Liu, and R. Zhang, "Optimized uplink transmission in multi-antenna C-RAN with spatial compression and forward," IEEE Trans. Signal Process., vol. 63, no. 19, pp. 5083-5095, Oct. 2015. (Available: arXiv)
♣ S. Lee, L. Liu, and R. Zhang, "Collaborative wireless energy and information transfer in interference channel," IEEE Trans. Wireless Commun., vol. 14, no. 1, pp. 545-557, Jan. 2015. (Available: arXiv)
L. Liu, R. Zhang, and K. C. Chua, "Multi-antenna wireless powered communication with energy beamforming," IEEE Trans. Commun., vol. 62, no. 12, pp. 4349-4361, Dec. 2014. ESI Highly Cited Paper (Available: arXiv)
♣ J. Xu, L. Liu, and R. Zhang, "Multiuser MISO beamforming for simultaneous wireless information and power transfer," IEEE Trans. Signal Process., vol. 62, no. 18, pp. 4798-4810, Aug. 2014. ESI Highly Cited Paper & 2017 IEEE Signal Processing Society Young Author Best Paper Award (Available: arXiv)
♣ Q. Shi, L. Liu, W. Xu, and R. Zhang, "Joint transmit beamforming and receive power splitting for MISO SWIPT systems," IEEE Trans. Wireless Commun., vol. 13, no. 6, pp. 3269-3280, Jun., 2014. ESI Highly Cited Paper (Available: arXiv)
L. Liu, R. Zhang, and K. C. Chua, "Secrecy wireless information and power transfer with MISO beamforming," IEEE Trans. Signal Process., vol. 62, no. 7, pp. 1850-1863, Apr. 2014. ESI Highly Cited Paper (Available: arXiv)
L. Liu, R. Zhang, and K. C. Chua, "Wireless information and power transfer: a dynamic power splitting approach," IEEE Trans. Commun., vol. 61, no. 9, pp. 3990-4001, Sep. 2013. ESI Highly Cited Paper (Available: arXiv)
L. Liu, R. Zhang, and K. C. Chua, "Wireless information transfer with opportunistic energy harvesting," IEEE Trans. Wireless Commun., vol. 12, no. 1, pp. 288-300, Jan. 2013. ESI Highly Cited Paper (Available: arXiv)
L. Liu, R. Zhang, and K. C. Chua, "Achieving global optimality for weighted sum-rate maximization in the K-user Gaussian interference channel with multiple antennas," IEEE Trans. Wireless Commun., vol. 11, no. 5, pp. 1933-1945, May 2012. (Available: arXiv)

Conference Papers


L. Liu and Y.-F. Liu, "An efficient algorithm for device detection and channel estimation in asynchronous IoT systems," submitted to IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), 2020. (Available: arXiv)
† Z. Wang, L. Liu, and S. Cui, "Intelligent reflecting surface assisted massive MIMO communications," in Proc. IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2020. (Available: arXiv)
† L. Cheng, L. Liu, and S. Cui, "A covariance-based user activity detection and channel estimation approach with novel pilot design," in Proc. IEEE International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), 2020. (Available: arXiv)
† Z. Wang, L. Liu, and S. Cui, "Channel estimation for intelligent reflecting surface assisted multiuser communications," in Proc. IEEE Wireless Communications and Networking Conference (WCNC), 2020. (Available: arXiv)
L. Liu, S. Zhang, and R. Zhang, "Exploiting NOMA for multi-beam UAV communication in cellular uplink," in Proc. IEEE International Conference on Communications (ICC), Shanghai, China, 2019.
L. Liu, S. Zhang, and R. Zhang, "Cooperative interference cancellation for multi-beam UAV uplink communication: A DoF analysis," in Proc. IEEE Global Communications Conference (Globecom) Workshops, Abu Dhabi, the United Arab Emirates, 2018.
† H. Xing, L. Liu, J. Xu, and A. Nallanathan, "Joint task assignment and wireless resource allocation for cooperative mobile-edge computing," in Proc. IEEE International Conference on Communications (ICC), Kansas, America, 2018.
L. Liu and W. Yu, "Massive device connectivity with massive MIMO," in Proc. IEEE International Symposium on Information Theory (ISIT), Aachen, Germany, 2017.
L. Liu and W. Yu, "Joint sparse beamforming and network coding for downlink multi-hop cloud radio access networks," in Proc. IEEE Global Communications Conference (Globecom), Washington D.C., America, 2016.
L. Liu, P. Patil, and W. Yu, "An uplink-downlink duality for cloud radio access network," in Proc. IEEE International Symposium on Information Theory (ISIT), Barcelona, Spain, 2016.
L. Liu and R. Zhang, "Downlink SINR balancing in C-RAN under limited fronthaul capacity," in Proc. IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Shanghai, China, 2016.
† H. Xing, L. Liu, and R. Zhang, "Secrecy wireless information and power transfer in fading wiretap channel," in Proc. IEEE International Conference on Communications (ICC), Sydney, Australia, 2014.
† J. Xu, L. Liu, and R. Zhang, "Multiuser MISO beamforming for simultaneous wireless information and power transfer," in Proc. IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Vancouver, BC, Canada, 2013.
L. Liu, R. Zhang, and K. C. Chua, "Secrecy wireless information and power transfer with MISO beamforming," in Proc. IEEE Global Communications Conference (Globecom), Atlanta, America, 2013.
L. Liu, R. Zhang, and K. C. Chua, "Wireless information transfer with opportunistic energy harvesting," in Proc. IEEE International Symposium on Information Theory (ISIT), Cambridge, MA, America, 2012.
L. Liu, R. Zhang, and K. C. Chua, "A new approach to weighted sum-rate maximization for the K-user Gaussian interference channel," in Proc. IEEE International Conference on Wireless Communications and Signal Processing (WCSP), Nanjing, China, 2011. Best Paper Award




Teaching

† Fall 2019: ENG 2003 Information Technology

† Spring 2020: ENG 2003 Information Technology

† Fall 2020: ENG 2003 Information Technology

† Spring 2021: EIE 579 Advanced Telecommunication Systems
                          ENG 2003 Information Technology

Activities

Guest Editor


[1] IEEE Wireless Communications Special Issue on Massive Machine-Type Communications for IoT


Technical Program Committee (TPC) Member


[1] IEEE VTC 2015 Fall
[2] IEEE Globecom 2015 Workshop on Heterogeneous and Small Cell Networks
[3] IEEE ICC 2016 Wireless Communications Symposium
[4] IEEE ICC 2016 Workshop on Wireless Physical Layer Security
[5] IEEE Globecom 2016 Workshop on Emerging Technologies for 5G Wireless Cellular Networks
[6] IEEE Globecom 2016 Workshop on Full Duplex Wireless Communications
[7] IEEE Globecom 2017 Workshop on Emerging Technologies for 5G and Beyond Wireless and Mobile Networks
[8] IEEE ICC 2017 Wireless Communications Symposium
[9] IEEE PIMRC 2018
[10] IEEE Globecom 2018 Workshop on Emerging Technologies for 5G and Beyond Wireless and Mobile Networks
[11] IEEE PIMRC 2019
[12] IEEE Globecom 2019 Wireless Communications Symposium


Reviewer


[1] IEEE Transactions on Wireless Communications
[2] IEEE Transactions on Communications (Exemplary Reviewer (Fewer than 2%) in 2015 and 2018)
[3] IEEE Transactions on Signal Processing
[4] IEEE Transactions on Information Theory
[5] IEEE Wireless Communications Magzine
[6] IEEE Journal of Selected Topics in Signal Processing
[7] IEEE Wireless Communications Letters (Exemplary Reviewer (Fewer than 3%) in 2015 and 2017)
[8] IEEE Communications Letters (Exemplary Reviewer (Fewer than 3%) in 2014 and 2013)
[9] ...


Awards

  • Highly Cited Researcher in 2018 by Clarivate Analytics.
  • IEEE Signal Processing Society Young Author Best Paper Award, 2017, for the paper coauthored with Jie Xu and Rui Zhang, for "Multiuser MISO beamforming for simultaneous wireless information and power transfer," IEEE Trans. Signal Process., vol. 62, no.18, pp. 4798-4810, Aug. 2014.
  • Best Paper Award, IEEE International Conference on Wireless Communications and Signal Processing (WCSP), 2011.
  • Exemplary Reviewer for IEEE Transactions on Communications, 2018 (Fewer than 2%)
  • Exemplary Reviewer for IEEE Wireless Communications Letters, 2017 (Fewer than 3%)
  • Exemplary Reviewer for IEEE Transactions on Communications, 2015 (Fewer than 2%)
  • Exemplary Reviewer for IEEE Wireless Communication Letters, 2015 (Fewer than 3%)
  • Exemplary Reviewer for IEEE Communications Letters, 2014 (Fewer than 3%)
  • Exemplary Reviewer for IEEE Communications Letters, 2013 (Fewer than 3%)
  • President's Graduate Fellowships, National University of Singapore, 2011-2014.
  • Research Scholarship, National University of Singapore, 2010-1011.
  • National Scholarship, Tianjin University, 2008.