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 IEEE Signal Processing Society Young Author Best Paper Award, 2017, and the best student paper award for International Conference on Wireless Communications and Signal Processing (WCSP), 2011. He is listed in the World's Most Influential Scientific Minds, also known as a Highly Cited Researcher, 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] My previous email: eleliu@nus.edu.sg can no longer be reached since 1 May 2019. Please contact me with my new email: liang-eie.liu@polyu.edu.hk.
[2] I am now recruiting PhD students and postdoctoral fellow to work on the next-generation cellular technologies and IoT. More information can be found at openings.

Openings

My research currently focuses on the next-generation cellular technologies and machine-type communications for Internet-of-Things (IoT). If you are interested in joining my research group and enjoying the wonderful life in Hong Kong, a modern metropolis and regional financial center, please drop me an email (liang-eie.liu@polyu.edu.hk) with CV attached. Available research positions include:


PhD Positions at PolyU (2020 Spring/Fall Intake)

I am always looking for self-motivated Ph.D. students who have strong math background and are passionate about wireless communications. Prospective students will work closely with me on advanced signal processing techniques to pave the way for IoT. Interested applicants can email me your CV with a list of the grades of your core curriculum (related to wireless communications and math). If you have some research experience, please also list your publications, which is a big plus. Detailed admission requirements for PhD study at PolyU can be found here.

PS: Candidates with strong background will be recommended by PolyU for applying the Hong Kong PhD Fellowship. The fellowship will provide a competitive monthly salary of 2500 USD and support international academic travels every year.


Postdoctoral Fellow Positions at PolyU

I am now recruiting a postdoc to work on unmanned aerial vehicles (UAVs) communications, machine-type communications for IoT, and massive MIMO. Interested applicants can email me your CV (including a complete list of publications) and three representative papers.

News

[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 Highly Cited Researcher 2018 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 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. 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

My research interests span a broad area of wireless communications, including:

[1] Multiuser MIMO
  • Interference channel, broadcast channel, multiple-access channel
  • Beamforming design



[2] Wireless Power Transfer (WPT)
  • Simultaneous wireless information and power transfer
  • Wireless powered communication networks



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



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



[5] Ultra-Reliable and Low Latency Communications (URLLC)
  • Factory automation for Industry 4.0
  • D2D-aided protocol for URLLC



[6] Unmanned aerial vehicles (UAVs) Communications
  • Uplink communications: interference control for terrestrial communications
  • Downlink communications: URLLC to control UAVs

Publications

Book Chapters


[1] 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)
[2] 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


[1] 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)
[2] 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)
[3] 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)
[4] 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)
[5] 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)
[6] 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)
[7] 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)
[8] 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)
[9] 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)
[10] 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)
[11] 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)
[12] 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)
[13] 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)
[14] 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. (Available: arXiv)
[15] 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)
[16] 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)
[17] 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)
[18] 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)
[19] 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. (Available: arXiv)
[20] 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)
[21] L. Liu, S. Zhang, and R. Zhang, "Multi-beam UAV communication in cellular uplink: cooperative interference cancellation and sum-rate maximization," to appear in IEEE Trans. Wireless Commun., 2019.
(Available: arXiv)

Conference Papers


[1] 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 Student Paper Award
[2] 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.
[3] 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.
[4] 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.
[5] 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.
[6] 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.
[7] 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.
[8] 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.
[9] L. Liu and W. Yu, "Massive device connectivity with massive MIMO," in Proc. IEEE International Symposium on Information Theory (ISIT), Aachen, Germany, 2017.
[10] 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.
[11] 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.
[12] 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.

Teaching

Coming soon.

Activities

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 (I have reviewed over 50 TWC papers since 2013)
[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 2018 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 Student 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.