77 citations · 116 across the 23 of their papers we have counts for
24 papers
Fast Pinching-Antenna Activation for AirComp
Zhenqiao Cheng, Boqun Zhao, Chongjun Ouyang +1
A pinching-antenna system (PASS) is considered for over-the-air computation (AirComp). Multiple dielectric waveguides are deployed at the base station, and one pinching antenna (PA…
Beamforming Gain with Single-RF Movable Arrays
Zhenqiao Cheng, Chongjun Ouyang, Hao Jiang +2
A single-radio-frequency (RF) movable array is investigated, in which all movable elements are driven by a single RF chain with equal amplitude and equal phase. The achievable beam…
Spatio-Sequential Recurrent Network for 3-D Tunnel Propagation Modeling
Jiahao Li, Jingxin Xue, Keqi Ni +4
Fine-mesh parabolic wave equation (PWE) simulations are high-fidelity but time-consuming, which limits real-time tunnel propagation analysis and motivates coarse-to-fine reconstruc…
A Stable SBP-SAT FDTD Subgridding Method Without Region Split
Yuhui Wang, Langran Deng, Weibo Wu +7
A provably stable summation-by-parts simultaneous approximation term (SBP-SAT) finite-difference time-domain (FDTD) subgridding method without region split is proposed. By designin…
Continuous-Aperture Array-Based ISAC Over Fading Channels
Boqun Zhao, Chongjun Ouyang, Xingqi Zhang +1
A framework of continuous-aperture array (CAPA)-based integrated sensing and communications (ISAC) under a fading communication channel is proposed. A continuous operator-based sig…
Secure Multiuser Beamforming With Movable Antenna Arrays
Zhenqiao Cheng, Chongjun Ouyang, Boqun Zhao +1
A movable antenna (MA)-enabled secure multiuser transmission framework is developed to enhance physical-layer security. Novel expressions are derived to characterize the achievable…
Reducing Simulation Effort for RIS Optimization using an Efficient Far-Field Approximation
Hans-Dieter Lang, Michel A. Nyffenegger, Heinz Mathis +1
Optimization of Reconfigurable Intelligent Surfaces (RIS) via a previously introduced method is effective, but time-consuming, because multiport impedance or scatter matrices are r…
Diversity and Multiplexing for Continuous Aperture Array (CAPA)-Based Communications
Chongjun Ouyang, Zhaolin Wang, Xingqi Zhang +1
A general fading model for multipath channels between two non-parallel continuous-aperture arrays (CAPAs) is proposed. Building on this model, the performance of diversity and mult…
Performance Analysis of Physical Layer Security: From Far-Field to Near-Field
Boqun Zhao, Chongjun Ouyang, Xingqi Zhang +1
The secrecy performance in both near-field and far-field communications is analyzed using two fundamental metrics: the secrecy capacity under a power constraint and the minimum pow…
Continuous-Aperture Array (CAPA)-Based Wireless Communications: Capacity Characterization
Boqun Zhao, Chongjun Ouyang, Xingqi Zhang +1
The capacity limits of continuous-aperture array (CAPA)-based wireless communications are characterized. To this end, an analytically tractable transmission framework is establishe…
Aperture Selection for CAP Arrays (CAPAs)
Chongjun Ouyang, Yuanwei Liu, Xingqi Zhang
The concept of aperture selection is proposed for continuous aperture array (CAPA)-based communications. The achieved performance is analyzed in an uplink scenario by considering b…
On the Performance of Continuous Aperture Array (CAPA)-Based Wireless Communications
Chongjun Ouyang, Yuanwei Liu, Xingqi Zhang
The performance of continuous aperture array (CAPA)-based wireless communications is analyzed in an uplink scenario. An analytical framework is proposed to characterize uplink CAPA…
Exploiting Movable Antennas in Multicast Communications
Zhenqiao Cheng, Nanxi Li, Jianchi Zhu +2
This article investigates the integration of movable antennas (MAs) into multicast communication systems. By discretizing the motion of the MAs, a novel MA-assisted multicast trans…
Channel Capacity of Near-Field Line-of-Sight Multiuser Communications
Boqun Zhao, Chongjun Ouyang, Xingqi Zhang +1
The channel capacity of near-field (NF) communications is characterized by considering three types of line-of-sight multiuser channels: i) multiple access channel (MAC), ii) broadc…
On the Impact of Reactive Region on the Near-Field Channel Gain
Chongjun Ouyang, Zhaolin Wang, Boqun Zhao +2
The near-field channel gain is analyzed by considering both radiating and reactive components of the electromagnetic field. Novel expressions are derived for the channel gains of s…
Performance Analysis of Holographic MIMO Based Integrated Sensing and Communications
Boqun Zhao, Chongjun Ouyang, Xingqi Zhang +1
A holographic multiple-input multiple-output (MIMO)-based integrated sensing and communications (ISAC) framework is proposed for both downlink and uplink scenarios. The spatial cor…
Modeling and Analysis of Near-Field ISAC
Boqun Zhao, Chongjun Ouyang, Yuanwei Liu +2
As the technical trends for the next-generation wireless network significantly extend the near-field region, a performance reevaluation of integrated sensing and communications (IS…
Movable Antennas-Assisted Over-the-Air Computation: Dynamic and Static Design
Zhenqiao Cheng, Nanxi Li, Jianchi Zhu +3
A novel over-the-air computation (AirComp) framework empowered by movable antennas (MAs) is proposed to significantly enhance computation accuracy. Within this framework, the joint…
Physics-Based Trajectory Design for Cellular-Connected UAV in Rainy Environments Based on Deep Reinforcement Learning
Hao Qin, Zhaozhou Wu, Xingqi Zhang
Cellular-connected unmanned aerial vehicles (UAVs) have gained increasing attention due to their potential to enhance conventional UAV capabilities by leveraging existing cellular…
Investigating Sparse Reconfigurable Intelligent Surfaces (SRIS) via Maximum Power Transfer Efficiency Method Based on Convex Relaxation
Hans-Dieter Lang, Michel A. Nyffenegger, Heinz Mathis +1
Reconfigurable intelligent surfaces (RISs) are widely considered to become an integral part of future wireless communication systems. Various methodologies exist to design such sur…
Near-Field Communications: A Degree-of-Freedom Perspective
Chongjun Ouyang, Yuanwei Liu, Xingqi Zhang +1
Multiple-antenna technologies are advancing towards large-scale aperture sizes and extremely high frequencies, leading to the emergence of near-field communications (NFC) in future…
Downlink and Uplink NOMA-ISAC with Signal Alignment
Boqun Zhao, Chongjun Ouyang, Xingqi Zhang +1
Integrated Sensing and Communications (ISAC) surpasses the conventional frequency-division sensing and communications (FDSAC) in terms of spectrum, energy, and hardware efficiency,…
Revealing the Impact of Beamforming in ISAC
Chongjun Ouyang, Yuanwei Liu, Xingqi Zhang
This letter proposes advanced beamforming design and analyzes its influence on the sensing and communications (S&C) performance for a multiple-antenna integrated S&C (ISAC) system…
Towards the Development of A Three-Dimensional SBP-SAT FDTD Method: Theory and Validation
Yu Cheng, Hanhong Liu, Xinsong Wang +5
To enhance the scalability and performance of the traditional finite-difference time-domain (FDTD) methods, a three-dimensional summation-by-parts simultaneous approximation term (…