Near-field multiuser secure communication via dynamic metasurface antenna

IF 2.2 4区 计算机科学 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Zhichao Sheng , Yujiao Qiu , Ali Arshad Nasir , Syed Ali Hassan , Xue-Xia Yang
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引用次数: 0

Abstract

The near-field multiuser secure communication system is investigated in this paper, where dynamic metasurface antennas (DMAs) are deployed at the base station to communicate with multiple users under the threats of multiple eavesdroppers. To ensure the safety performance of the system, the minimum secrecy rate is maximized by jointly optimizing the DMA weight matrix and digital precoder under the constraints of transmit power and the Lorentzian phase of DMA. A two-stage algorithm is proposed to address the nonconvex optimization problem. In the first stage, the fully digital (FD) beamformer is designed using successive convex approximation technique. In the second stage, the Euclidean distance between the FD beamformer and the DMA-based beamformer is minimized. To this end, the DMA weight matrix and the digital precoder are alternatively optimized by the block coordinate descent approach. In numerical simulations, the DMA-based beamforming design achieves better performance than the conventional partially connected phase-shift-based hybrid analog/digital beamforming design.
基于动态超表面天线的近场多用户安全通信
本文研究了近场多用户安全通信系统,该系统在基站上部署动态元表面天线(dma),在多个窃听者的威胁下与多个用户进行通信。为了保证系统的安全性能,在DMA的发射功率和洛伦兹相位约束下,通过联合优化DMA权矩阵和数字预编码器实现最小保密率的最大化。提出了一种两阶段算法来解决非凸优化问题。在第一阶段,采用逐次凸逼近技术设计全数字波束形成器。在第二阶段,FD波束形成器和基于dma的波束形成器之间的欧氏距离最小。为此,采用块坐标下降法交替优化DMA权矩阵和数字预编码器。在数值模拟中,基于dma的波束形成设计比传统的部分连接相移混合模拟/数字波束形成设计具有更好的性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physical Communication
Physical Communication ENGINEERING, ELECTRICAL & ELECTRONICTELECO-TELECOMMUNICATIONS
CiteScore
5.00
自引率
9.10%
发文量
212
审稿时长
55 days
期刊介绍: PHYCOM: Physical Communication is an international and archival journal providing complete coverage of all topics of interest to those involved in all aspects of physical layer communications. Theoretical research contributions presenting new techniques, concepts or analyses, applied contributions reporting on experiences and experiments, and tutorials are published. Topics of interest include but are not limited to: Physical layer issues of Wireless Local Area Networks, WiMAX, Wireless Mesh Networks, Sensor and Ad Hoc Networks, PCS Systems; Radio access protocols and algorithms for the physical layer; Spread Spectrum Communications; Channel Modeling; Detection and Estimation; Modulation and Coding; Multiplexing and Carrier Techniques; Broadband Wireless Communications; Wireless Personal Communications; Multi-user Detection; Signal Separation and Interference rejection: Multimedia Communications over Wireless; DSP Applications to Wireless Systems; Experimental and Prototype Results; Multiple Access Techniques; Space-time Processing; Synchronization Techniques; Error Control Techniques; Cryptography; Software Radios; Tracking; Resource Allocation and Inference Management; Multi-rate and Multi-carrier Communications; Cross layer Design and Optimization; Propagation and Channel Characterization; OFDM Systems; MIMO Systems; Ultra-Wideband Communications; Cognitive Radio System Architectures; Platforms and Hardware Implementations for the Support of Cognitive, Radio Systems; Cognitive Radio Resource Management and Dynamic Spectrum Sharing.
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