Dynamic environments pose fundamental challenges to integrated sensing and communication (ISAC), particularly due to severe Doppler effects, rapidly time-varying channels, and the intricate coupling between delay and Doppler shifts. Affine frequency-division multiplexing (AFDM), with its inherent capability of characte...
Lin-Chu Chen, Zhen-Dong Li, Zhou Su et al.· 0 citations
Integrated sensing and communication (ISAC) has emerged as a key enabler for sixth-generation (6G) networks, yet its broadcast nature at the physical layer leaves transmissions vulnerable to malicious eavesdropping, particularly when physical blockages degrade direct links. Reconfigurable intelligent surface (RIS) offe...
Zhen-Dong Li, Jin-Yuan Huang, Wei-Chun Zhao et al.· 0 citations
Integrated sensing and communications (ISAC) significantly improves spectral efficiency but introduces security risks regarding the interception of embedded communication signals. This paper proposes an movable antenna (MA)-enabled secure ISAC system that utilizes the spatial degrees of freedom of MA to mitigate these...
Zhen-Dong Li, Yujie Zhao, Zhou Su et al.· 0 citations
This article investigates a transmissive reconfigurable intelligent surface (TRIS) transceiver architecture-enabled multigroup multicast downlink communication system. Under this setup, an optimization problem is formulated to maximize the sum of the minimum user rates of all groups, subject to the per-unit transmit po...
Yuan Guo, Wen Chen, Y. Zhu et al.· IEEE Internet of Things Jour...· 0 citations
This paper investigates a reconfigurable intelligent surface (RIS)-enabled secure integrated sensing and communication (ISAC) system, where the direct links between the base station (BS) and users are blocked and a mobile eavesdropper is treated as both a potential wiretapper and a sensing target. The time-varying eave...
Zhen-Dong Li, Wei-Chun Zhao, Zhou Su et al.· 0 citations
An alternating optimization (AO) framework is proposed, employing techniques including discrete binary particle swarm optimization (BPSO), successive convex approximation (SCA) and difference-of-convex (DC) programming to transform the optimization problem into convex subproblems.
Zhen-Dong Li, Min Zhu, Zhou Su et al.· 0 citations
As an emerging framework, movable antenna (MA)-enabled wireless powered networks (WPNs) have attracted growing attention. WPNs integrate wireless communication and energy transfer. MA can dynamically adjust the position of antenna units by introducing additional spatial degrees of freedom, so as to make full use of cha...
Zhen-Dong Li, Yi-Ran Zheng, Tian-Yu Li et al.· 0 citations
This paper elaborates on the hardware architecture and channel characteristics of MA and introduces the fundamental logic of the GML framework and compares it with existing methods, and discusses the constraint handling strategies for applying the proposed optimization framework to MA networks.
Zhen-Dong Li, Yujie Zhao, Zhou Su et al.· 0 citations
This paper investigates over-the-air (OTA) computation enabled online federated learning (FL) in low-Earth orbit (LEO) satellite networks. Specifically, we consider a dual-layer OTA aggregation architecture, where ground devices upload analog model updates to serving satellites via uplink OTA aggregation, and satellite...
Zhen-Dong Li, Shao-Jie Wang, Zhou Su et al.· 0 citations
In this paper, we propose a robust beamforming algorithm for reconfigurable holographic surface (RHS)-enhanced uplink covert satellite communication systems. Specifically, the jamming signal is utilized to confuse multiple eavesdropping satellites. We derive the minimum detection error probability (DEP) and the optimal...
Ce Guo, Ying Wang, Zhen-Dong Li et al.· IEEE Transactions on Communi...· 0 citations
This article outlines the fundamental principles of the dual-layer OTA model and introduces the adaptive BH mechanism designed for time-varying topologies, aiming to provide insights for the evolution of ubiquitous non-terrestrial intelligence.
Zhen-Dong Li, Shao-Jie Wang, Zhou Su et al.· 0 citations
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