13 papers
Non-Square UPA-Enabled XL-MIMO Systems: Anisotropic Near-Field Characterization, Fundamental Limits, and Channel Estimation
Yilong Liu, Xi Yang, Jing Xu +2
Extremely large-scale multiple-input multiple-output (XL-MIMO) is crucial for next-generation communication systems. In practice, the deployment of non-square uniform planar arrays…
XL-ChannelDiff: An Efficient Diffusion-Based Multi-Domain Near-Field Channel Extrapolation Framework for XL-MIMO Systems
Mengyuan Li, Yu Han, Hao Xu +3
Accurate channel state information (CSI) acquisition is essential for unleashing the performance gains of extremely large-scale multiple-input multiple-output (XL-MIMO) systems. Ho…
Digital Twin-Based Channel Generation Toolchain and Foundation Model for Low-Altitude XL-MIMO
Mengyuan Li, Yu Han, Jiachen Tian +2
The rapid development of the low-altitude economy (LAE) has created growing demand for reliable aerial communication systems. Extremely large-scale multiple-input multiple-output (…
Vision-Based Efficient Joint Trajectory and Channel Tracking in Near-Field XL-MIMO Systems
Mengyuan Li, Yu Han, Hao Xu +3
Accurate joint tracking of mobile users, surrounding scatterers, and dynamic channels is a critical task for sixth-generation (6G) wireless systems, essential for both ensuring hig…
CP-OFDM Achieves Lower Ranging CRB Than Frequency-Spread Waveforms in the Large-Sample Regime
Fan Liu, Yifeng Xiong, Ya-Feng Liu +3
The inherent randomness of communication symbols creates a fundamental tension in Integrated Sensing and Communications (ISAC). On the one hand, they enable data transmission while…
XFreq-GS: Cross-Frequency Wireless Radiation Field Reconstruction with 3D Gaussian Splatting
Sheng Wang, Hengtao He, Chaozheng Wen +5
Channel modeling is fundamental to the analysis, design, and optimization of wireless communication systems, which, however, accurate wireless channel modeling remains challenging,…
Wideband Precoding for U6G XL-MIMO Systems: Beam Squint Boundaries and Channel Slicing
Zhizheng Lu, Yu Han, Xiaojie Li +2
The unconventionally large aperture of extremely large-scale multiple-input multiple-output (XL-MIMO) arrays, in conjunction with the wider bandwidths in the upper-6 GHz (U6G) freq…
Analytical Framework of Airy Beams in Near-Field XL-MIMO: From Ideal Optics to Wireless Reality
Zhizheng Lu, Yu Han, Ruirui Sun +2
The synthesis of Airy-profiled wavefronts has emerged as a pivotal paradigm for advanced electromagnetic engineering, attributed to their intrinsic non-diffractive propagation, tra…
Structure-Aware Multimodal LLM Framework for Trustworthy Near-Field Beam Prediction
Mengyuan Li, Qianfan Lu, Jiachen Tian +5
In near-field extremely large-scale multiple-input multiple-output (XL-MIMO) systems, spherical wavefront propagation expands the traditional beam codebook into the joint angular-d…
Pioneering Scalable Prototyping for Mid-Band XL-MIMO Systems: Design and Implementation
Jiachen Tian, Yu Han, Zhengtao Jin +6
The mid-band frequency range, combined with extra large-scale multiple-input multiple-output (XL-MIMO), is emerging as a key enabler for future communication systems. Thanks to the…
Distributed U6G ELAA Communication Systems: Channel Measurement and Small-Scale Fading Characterization
Jiachen Tian, Zhengtao Jin, Xiayang Chen +4
The distributed upper 6 GHz (U6G) extra-large scale antenna array (ELAA) is a key enabler for future wireless communication systems, offering higher throughput and wider coverage,…
Keypoint Detection Empowered Near-Field User Localization and Channel Reconstruction
Mengyuan Li, Yu Han, Zhizheng Lu +3
In the near-field region of an extremely large-scale multiple-input multiple-output (XL MIMO) system, channel reconstruction is typically addressed through sparse parameter estimat…
On the Downlink Average Energy Efficiency of Non-Stationary XL-MIMO
Jun Zhang, Jiacheng Lu, Jingjing Zhang +3
Extra large-scale multiple-input multiple-output (XL-MIMO) is a key technology for future wireless communication systems. This paper considers the effects of visibility region (VR)…