792 citations · 864 across the 31 of their papers we have counts for
34 papers
Learning or Modeling? Virtual XL-RIS Observation Reconstruction for Near-Field Sensing
Tuo Wu, Jie Tang, Jiacheng Wang +5
A passive extremely large-scale reconfigurable intelligent surface (XL-RIS) offers a position-sensitive aperture for near-field sensing, but its element-wise signals are not direct…
Prior-Aided Masked Vector Quantization CSI Feedback for FDD Massive MIMO Systems
Yi Song, Tianyu Yang, Kangda Zhi +4
Downlink channel state information (CSI) feedback is a key bottleneck in frequency-division duplex (FDD) massive MIMO systems, as the user equipment (UE) must convey its estimated…
Low-Complexity Near-Field Channel Estimation and Subcarrier-Cooperative Hybrid Precoding for Wideband XL-MIMO OFDM Systems
Kangda Zhi, Tianyu Yang, Songyan Xue +2
This paper addresses both accurate near-field channel acquisition and scalable precoding for wideband extremely large aperture MIMO (XL-MIMO) OFDM systems, with particular focus on…
Electromagnetic Twin: From Sparse Measurements to Persistent Wireless Intelligence
Tuo Wu, Lifeng Mai, Jie Tang +7
Radio maps and channel knowledge maps provide reusable propagation knowledge, but a stored map can become locally outdated after persistent changes to doors, partitions, furniture,…
From Sparse Probes to Sum-Rate Maximization: Electromagnetic Twin Beamforming
Tuo Wu, Kangda Zhi, Jie Tang +3
Probing every candidate location at each wireless-map update is costly. This letter develops electromagnetic-twin (ET) beamforming that converts sparse spatial probes into a sum-ra…
Electromagnetic Twin: Completing the Wireless World from Sparse Channel Evidence
Tuo Wu, Jie Tang, Kangda Zhi +5
Acquiring dense channel information over many locations and beams incurs considerable pilot and processing overhead. Radio maps and channel knowledge maps (CKMs) reduce this overhe…
Near-Field Communications with Different Array Geometries: Rayleigh Distance, Channel Estimation, and Transmission Design
Kangda Zhi, Yi Song, Tianyu Yang +5
This work establishes a framework of near-field communication under different array geometries of extremely large-scale multiple-input multiple-output (XL-MIMO). We first formulate…
FAS-RIS for V2X: Unlocking Realistic Performance Analysis with Finite Elements
Tuo Wu, Xiazhi Lai, Maged Elkashlan +3
The synergy of fluid antenna systems (FAS) and reconfigurable intelligent surfaces (RIS) is poised to unlock robust Vehicle-to-Everything (V2X) communications. However, a critical…
Scalable Fluid Antenna Systems: A New Paradigm for Array Signal Processing
Tuo Wu, Ye Tian, Jie Tang +8
Most existing antenna array-based source localization methods rely on fixed-position arrays (FPAs) and strict assumptions about source field conditions (near-field or far-field), w…
Low-Complexity Iterative Precoding Design for Near-field Multiuser Systems With Spatial Non-Stationarity
Mengyu Liu, Cunhua Pan, Kangda Zhi +4
Extremely large antenna arrays (ELAA) are regarded as a promising technology for supporting sixth-generation (6G) networks. However, the large number of antennas significantly incr…
A Framework of FAS-RIS Systems: Performance Analysis and Throughput Optimization
Junteng Yao, Xiazhi Lai, Kangda Zhi +6
In this paper, we investigate reconfigurable intelligent surface (RIS)-assisted communication systems which involve a fixed-antenna base station (BS) and a mobile user (MU) that is…
Transmission Design for XL-RIS-Aided Massive MIMO System with Visibility Regions
Luchu Li, Kangda Zhi, Cunhua Pan
This paper proposes a two-timescale transmission scheme for extremely large-scale (XL)-reconfigurable intelligent surfaces (RIS)-aided massive multi-input multi-output (MIMO) syste…
Near-Field Mobile Tracking: A Framework of Using XL-RIS Information
Tuo Wu, Cunhua Pan, Kangda Zhi +4
This paper introduces a novel mobile tracking framework leveraging the high-dimensional signal received from extremely large-scale (XL) reconfigurable intelligent surfaces (RIS). T…
RIS-assisted Cell-Free Massive MIMO Systems With Two-Timescale Design and Hardware Impairments
Jianxin Dai, Jin Ge, Kangda Zhi +2
Integrating the reconfigurable intelligent surface (RIS) into a cell-free massive multiple-input multiple-output (CF-mMIMO) system is an effective solution to achieve high system c…
Performance Analysis on RIS-Aided Wideband Massive MIMO OFDM Systems with Low-Resolution ADCs
Xianzhe Chen, Hong Ren, Cunhua Pan +6
This paper investigates a reconfigurable intelligent surface (RIS)-aided wideband massive multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) sy…
Exploit High-Dimensional RIS Information to Localization: What Is the Impact of Faulty Element?
Tuo Wu, Cunhua Pan, Kangda Zhi +5
This paper proposes a novel localization algorithm using the reconfigurable intelligent surface (RIS) received signal, i.e., RIS information. Compared with BS received signal, i.e.…
Employing High-Dimensional RIS Information for RIS-aided Localization Systems
Tuo Wu, Cunhua Pan, Kangda Zhi +4
Reconfigurable intelligent surface (RIS)-aided localization systems have attracted extensive research attention due to their accuracy enhancement capabilities. However, most studie…
Joint Beamforming Design for Double Active RIS-assisted Radar-Communication Coexistence Systems
Mengyu Liu, Hong Ren, Cunhua Pan +5
Integrated sensing and communication (ISAC) technology has been considered as one of the key candidate technologies in the next-generation wireless communication systems. However,…
FAS-assisted Wireless Powered Communication Systems
Xiazhi Lai, Kangda Zhi, Wanyi Li +3
Fluid Antenna System (FAS) is recognized as a promising technology for enhancing communication performance. In this context, we explored the potential of FAS-assisted wireless powe…
Performance Analysis and Low-Complexity Design for XL-MIMO with Near-Field Spatial Non-Stationarities
Kangda Zhi, Cunhua Pan, Hong Ren +4
Extremely large-scale multiple-input multiple-output (XL-MIMO) is capable of supporting extremely high system capacities with large numbers of users. In this work, we build a frame…
Two-Timescale Design for RIS-aided Cell-free Massive MIMO Systems with Imperfect CSI
Mahdi Eskandari, Kangda Zhi, Huiling Zhu +2
The objective of this paper is to evaluate the effectiveness of a two-timescale transmission design in cell-free massive multi-input multiple-output (MIMO) systems incorporating re…
Toward Secure and Private Over-the-Air Federated Learning
Na Yan, Kezhi Wang, Kangda Zhi +3
In this paper, a novel secure and private over-the-air federated learning (SP-OTA-FL) framework is studied where noise is employed to protect data privacy and system security. Spec…
Two-Timescale Transmission Design for RIS-Aided Cell-Free Massive MIMO Systems
Jianxin Dai, Jin Ge, Kangda Zhi +4
This paper investigates the performance of a two-timescale transmission design for uplink reconfigurable intelligent surface (RIS)-aided cell-free massive multiple-input multiple-o…
An Overview of Signal Processing Techniques for RIS/IRS-aided Wireless Systems
Cunhua Pan, Gui Zhou, Kangda Zhi +8
In the past as well as present wireless communication systems, the wireless propagation environment is regarded as an uncontrollable black box that impairs the received signal qual…