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Hello :-)

I am a Ph.D. candidate at the City University of Hong Kong, supervised by Prof. Xianghao YU. I received my B.S. and M.S. degrees in Electrical Engineering from Beijing Institute of Technology, supervised by Prof. Zhen GAO. My research lies at the intersection of signal processing and wireless communications, with a recent focus on near-field communications, movable antenna systems, and bending caustic beams. I have published some papers at IEEE ComSoc/SPS/VTS conferences and journals with total google scholar citations ~900, and have been nominated as an Exemplary Reviewer by IEEE Commun. Lett. and IEEE Wireless Commun. Lett.

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Research

Bending Beams For Secure Links

Caustic beamforming shapes bending beams that follow curved trajectories, creating controllable non-line-of-sight secure regions and suppressing unintended receivers in the near field.

Near-Field Security Caustics Beamforming

Movable Antenna Placement

Movable antennas are placed through electrostatic-equilibrium-inspired updates, turning discrete near-field placement into a structured optimization problem with low-complexity geometry.

Movable Antenna Optimization Near-Field Geometry

Optimal Antenna Density

Continuous antenna density design is treated as a functional optimization problem, revealing how aperture resources should concentrate across massive movable antenna systems.

Functional Analysis Density Design Aperture MIMO

Near-Field Channel Estimation

Discrete prolate spheroidal sequences provide compact sparse dictionaries for near-field channels, reducing training overhead while preserving the dominant spatial structure.

DPSS Channel Estimation Sparse Dictionary Near-Field

Publications

Selected publications. More Details

Journals

1. [7]S. Liu, X. Yu*, and R. Schober, "Robust and Secure Near-Field Communication via Curved Caustic Beams", IEEE Wireless Commun. Lett., vol. 15, pp. 3069-3073, May. 2026. [arXiv] [Paper]
   
2. [6]S. Liu, X. Yu*, S. Song and K. B. Letaief, "Near-Field Communication with Movable Antennas: An Electrostatic Equilibrium Perspective", IEEE Trans. Wireless Commun., pp. 16024-16039, Apr. 2026. [arXiv] [Paper] [Demo] [Codes]
   
3. [5]S. Liu, X. Yu*, J. Xu and R. Zhang, "Near-Field Communication with Massive Movable Antennas: A Functional Perspective", IEEE Trans. Wireless Commun., vol. 25, pp. 14455 - 14470, Apr. 2026. [arXiv] [Paper] [Codes]
   
4. [4]S. Liu, X. Yu*, Z. Gao, J. Xu, D. W. K. Ng, and S. Cui, "Sensing-Enhanced Channel Estimation for Near-Field XL-MIMO Systems", IEEE J. Sel. Areas Commun., vol. 43, no. 3, pp. 628-643, Mar. 2025, ESI Highly Cited. [arXiv] [Paper] [Erratum] [Codes]
   
5. [3]Z. Gao, S. Liu, Y. Su, Z. Li and D. Zheng, "Hybrid Knowledge-Data Driven Channel Semantic Acquisition and Beamforming for Cell-Free Massive MIMO", IEEE J. Sel. Topics Signal Process., vol. 17, no. 5, pp. 964-979, Jul. 2023. [Paper]
   
6. [2]X. Zhou; K. Ying; S. Liu; M. Ke; Z. Gao and M.-S. Alouini, "Reconfigurable Intelligent Surface Assisted Grant-Free Massive Access", Intell. Converg. Netw., vol. 3, no. 1, pp. 134 - 143, Mar. 2022. [arXiv] [Paper]
   
7. [1]S. Liu, Z. Gao, J. Zhang, M. D. Renzo and M. -S. Alouini, "Deep Denoising Neural Network Assisted Compressive Channel Estimation for mmWave Intelligent Reflecting Surfaces", IEEE Trans. Veh. Technol., vol. 69, no. 8, pp. 9223-9228, Aug. 2020, ESI Highly Cited, Best Readings of RIS. [arXiv] [Paper] [Codes]
   

Articles

1. [3]S. Liu, X. Yu*, and R. Schober, "Bending the Rules of Propagation: Caustic Beamforming for Next-Generation Wireless Systems", arXiv preprint, Jun. 2026. [arXiv]
   
2. [2]L. Bian, X. Chang, S. Jiang, L. Yang, X. Zhan, S. Liu, D. Li, R. Yan, Z. Gao, and J. Zhang, "Large-scale scattering-augmented optical encryption", Nat. Commun., vol. 15, no. 9807, pp. 1-12, Nov. 2024. [Paper] [Codes]
   
3. [1]S. Liu, Z. Gao, Y. Wu, D. W. K. Ng, and X. Gao, K.-K. Wong, S. Chatzinotas, and B. Ottersten, "LEO Satellite Constellations for 5G and Beyond: How Will They Reshape Vertical Domains?", IEEE Commun. Mag., vol. 59, no. 7, pp. 30-36, Jun. 2021. [Paper]
   

Conferences

1. [6]S. Liu, X. Yu*, "Near-Field Line-of-Sight Communication with Massive Movable Antennas", in Proc. IEEE ICC, Glasgow, United Kingdom, May. 2026. [Paper] [Codes]
   
2. [5]H. Sun, S. Liu, X. Yu*, Y. Sun, "Flow Matching-Based Active Learning for Radio Map Construction with Low-Altitude UAVs", in Proc. IEEE ICASSP, Barcelona, Spain, Apr. 2026. [arXiv] [Paper]
   
3. [4]S. Liu, X. Yu*, "Low-Complexity Near-Field Localization with XL-MIMO Sectored Uniform Circular Arrays", in Proc. IEEE Globecom, Cape Town, South Africa, Dec. 2024. [arXiv] [Paper] [Codes] [Slides]
   
4. [3]S. Liu, X. Yu*, Z. Gao, and D. W. K. Ng, "DPSS-based dictionary design for near-field XL-MIMO channel estimation", in Proc. IEEE Int. Conf. Commun. (ICC), Denver, CO, USA, Jun. 2024. [arXiv] [Paper] [Codes] [Slides]
   
5. [2]S. Liu, Z. Gao, G. Chen, Y. Su, and L. Peng, "Transformer-based Joint Source Channel Coding for Textual Semantic Communication", in Proc. IEEE Int. Conf. Commun. China (ICCC), Dalian, Liaoning, China, Aug. 2023. [Paper]
   
6. [1]S. Liu, Z. Gao, C. Hu, S. Tan, L. Fang and L. Qiao, "Model-Driven Deep Learning Based Precoding for FDD Cell-Free Massive MIMO with Imperfect CSI", in Proc. IEEE International Wireless Communications and Mobile Computing (IWCMC), Dalian, Liaoning, China, Jun. 2022. [Paper]
   

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