OAM Mode-Group Generation Method: Partial Arc Transmitting Scheme

Modelling and Optimization of OAM-MIMO Communication Systems with Unaligned Antennas

The orbital angular momentum (OAM) wireless communication technique is emerging as one of potential techniques for the Sixth generation (6G) wireless communication system. The most advantage of OAM wireless communication technique is the natural orthogonality among different OAM states. However, one of the most disadvantages is the crosstalk among different OAM states which is widely caused by the atmospheric turbulence and misalignment between transmitting and receiving antennas. Considering the OAM-based multiple-input multiple-output (OAM-MIMO) transmission system with unaligned antennas, a…

基于轨道角动量的堆叠智能超表面全息多输入多输出通信

OAM-Enabled Holographic MIMO Communications with Stacked Intelligent Metasurfaces

研究基于轨道角动量的堆叠智能超表面全息多输入多输出通信，开发相关驱动优化算法，分析模式生成与接收能力，数值评估揭示解耦关系，结果表明合适架构支持可扩展、低开销的HMIMO通信。

Orbital-angular-momentum mode-group multiplexed transmission over a graded-index ring-core fiber based on receive diversity and maximal ratio combining

An orbital-angular-momentum (OAM) mode-group multiplexing (MGM) scheme based on a graded-index ring-core fiber (GIRCF) is proposed, in which a single-input two-output (or receive diversity) architecture is designed for each MG channel and simple digital signal processing (DSP) is utilized to adaptively resist the mode partition noise resulting from random intra-group mode crosstalk. There is no need of complex multiple-input multiple-output (MIMO) equalization in this scheme. Furthermore, the signal-to-noise ratio (SNR) of the received signals can be improved if a simple maximal ratio combinin…

由无中心能量空洞的新型OAM波束实现的视距信道近正交叠加通信：一项实验研究

Near-Orthogonal Overlay Communications in LoS Channel Enabled by Novel OAM Beams without Central Energy Voids: An Experimental Study

该研究提出一种可产生无中心能量空洞定向OAM波束的创新发射机设计，构建新型视距MIMO通信架构，经实验验证其在信道相关性、稳定性及误码率上均优于传统平面波天线系统，为通信协议优化和基建提供指导。

Beyond Diagonal Reconfigurable Intelligent Surfaces: From Transmitting and Reflecting Modes to Single-, Group-, and Fully-Connected Architectures

Reconfigurable intelligent surfaces (RISs) are envisioned as a promising technology for future wireless communications. With various hardware realizations, RISs can work under different modes (reflective/transmissive/hybrid) or have different architectures (single/group/fully-connected). However, most existing research focused on single-connected reflective RISs, mathematically characterized by diagonal phase shift matrices, while there is a lack of a comprehensive study for RISs unifying different modes/architectures. In this paper, we solve this issue by analyzing and proposing a general RIS…

由多层透射RIS增强的感知赋能安全可旋转阵列系统

Sensing-enabled Secure Rotatable Array System Enhanced by Multi-Layer Transmitting RIS

针对可旋转阵列系统中窃听者位于通信主链路的安全问题，本文采用双基站架构联合优化多类变量，提出两种算法实现保密速率提升约22%。