检索结果-内蒙古大学图书馆

IEEE International Conference on Electronic Information and Communication Technology (ICEICT)

作者： Ting Zeng Li Deng Shufang Li Botao Feng Beijing Laboratory of Advanced Information Networks & Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China College of Electronics and Information Engineering Shenzhen University Shenzhen China

ISBN: (数字)9781728190457

ISBN: (纸本)9781728190464

A reflection metasurface that can generate non-diffraction Bessel beams and achieve anomalous reflection with high efficiency at 5.8 GHz is proposed in this paper. The unit it utilizes has excellent amplitude and phase characteristics, greatly facilitating the construction of the proposed metasurface and laying a solid foundation for the improvement of efficiency. According to non-diffraction theory and anomalous reflection law, two metasurfaces are designed for comparison. The simulation results show that the designed metasurfaces successfully realize the non-diffractive beam with a focusing distance of 126 mm (2.44 λ 0 ), and can bend the normally reflected wave to the direction 10° from the +z direction in a vertical plane 45° away from the +x direction. The average efficiency of the metasurface within the focusing range is as high as 84.5%, thus could be used as radio energy transmission, telecommunication multiplexing and accurate detection devices.

关键词： Multiplexing system dynamics Focusing Metasurfaces Solids Reflection Structural beams

来源：评论

学校读者我要写书评

暂无评论

An One-dimensional Holographic Antenna For RFID Reader

An One-dimensional Holographic Antenna For RFID Reader

引用

IEEE International Conference on Electronic Information and Communication Technology (ICEICT)

作者： Xiaokui Ren Li Deng Shufang Li Chen Zhang Botao Feng Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China College of Electronics and Information Engineering Shenzhen University Shenzhen China

A one-dimensional holographic metasurface antenna that can achieve full-angle symmetrical dual-beam rapid scanning while keeping its position unchanged is proposed. The principle of holographic antenna and beam deflec... 详细信息

ISBN: (数字)9781728190457

ISBN: (纸本)9781728190464

关键词： Electric breakdown Simulation Conferences Metasurfaces Information and communication technology Antennas Radiofrequency identification

来源：评论

学校读者我要写书评

暂无评论

Hypergraph-Coloring-Based Pilot Allocation Algorithm for Massive MIMO systems

Hypergraph-Coloring-Based Pilot Allocation Algorithm for Mas...

引用

International Conference on Communications, Signal Processing, and systems, CSPS 2018

作者： Lian, Yongjin Zhang, Tiankui Wang, Youxiang Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China China Unicom Network Technology Research Institution Beijing China

ISBN: (纸本)9789811362637

Pilot contamination caused by unavoidable reuse of pilots in adjacent cell limits the performance of the massive multiple-input multiple-output (MIMO) systems severely. In this paper, we propose a hypergraph-coloring-based pilot allocation (HCPA) algorithm for pilot contamination mitigation, which can improve the system sum rate with the minimum achievable data rate requirement. In the proposed algorithm, an interference relationship graph with hyperedges to restrict the minimum uplink achievable rate is established, and then the pilots are allocated by graph coloring method. The numerical results show that the proposed algorithm can improve both the minimum achievable data rate and the total uplink sum rate. © 2019, Springer Nature Singapore Pte Ltd.

关键词： MIMO systems

来源：评论

学校读者我要写书评

暂无评论

Reflective Metasurface for Controlling the Beam Divergence Angles of Dual-mode OAM Waves

Reflective Metasurface for Controlling the Beam Divergence A...

引用

IEEE International Conference on Electronic Information and Communication Technology (ICEICT)

作者： Xiaoyuan He Li Deng Botao Feng Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture Convergence Beijing University of Posts and Telecommunications Beijing China College of Electronics and Information Engineering Shenzhen University Shenzhen China

ISBN: (数字)9781728190457

ISBN: (纸本)9781728190464

For dealing with the problem of receiving multimode orbital-angular momentum (OAM) waves resulting from different beam divergence angles of OAM waves with different topological charges, it is essential to control the beam divergence angles of OAM waves. In this paper, a method is proposed to control the beam divergence angles of multi-mode OAM waves without modifying the inherent topological charges by a reflective metasurface. Based on this method, a reflective metasurface is properly designed to generate dual-mode OAM waves with equal beam divergence angle. As a dual-mode OAM waves generator, the reflective metasurface is composed of 31x31 metal-insulator-metal elements which is capable to manipulate dual-polarized electromagnetic waves (EMWs) independently. Furthermore, as a beam divergence controller, the reflective metasurface is properly divided into two regions that are responsible for +1 mode and +3 mode OAM waves generations. In this way, dual-mode OAM waves with equal beam divergence angle can be generated by the proposed reflective metasurface. The proposed design provides an efficient technology to control the beam divergence angles of multi-mode OAM waves flexibly, which is conductive to simplify the receiving device in OAM based communication systems.

关键词： Communication systems Conferences Electromagnetic scattering Metasurfaces Orbits Generators Information and communication technology

来源：评论

学校读者我要写书评

暂无评论

Fast Recovery of Low-Rank and Joint-Sparse Signals in Wireless Body Area networks

Fast Recovery of Low-Rank and Joint-Sparse Signals in Wirele...

引用

IEEE International Conference on Communications in China (ICCC)

作者： Yanbin Zhang Longting Huang Yangqing Li Kai Zhang Changchuan Yin Beijing Laboratory of Advanced Information Networks Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China School of Information Engineering Wuhan University of Technology Wuhan China

ISBN: (数字)9781728173276

ISBN: (纸本)9781728173283

E-health monitoring signals collected from wireless body area networks (WBANs) usually have some highly correlated structures in a certain transform domain (e.g., discrete cosine transform (DCT)). We exploit these structures and propose a fast recovery algorithm for low-rank and joint-sparse (L&S) structured WBAN signal in the framework of compressed sensing (CS). By using a simultaneously L&S signal model, we employ the number of the bigger singular values and Bayesian learning which incorporates an L&S-inducing prior over the signal and the appropriate hyperpriors over all hyperparameters to recover the signal. Experiments show that the proposed algorithm has a superior performance to state-of-the-art algorithms.

关键词： Wireless communication Wireless sensor networks Transforms Body area networks Brain modeling Bayes methods Discrete cosine transforms

来源：评论

学校读者我要写书评

暂无评论

A Conformal OAM Metasurface Antenna Based On Holographic Principle

A Conformal OAM Metasurface Antenna Based On Holographic Pri...

引用

Asia-Pacific Conference on Microwave

作者： Xiaokui Ren Li Deng Chen Zhang Botao Feng Beijing Laboratory of Advanced Information Networks & Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunication Beijing China College of Electronics and Information Engineering Shenzhen University Shenzhen China

ISBN: (数字)9781728169620

ISBN: (纸本)9781728169637

We present a conformal metasurface antenna implemented by the holographic method that can be wrapped on the cylindrical carrier and produce the OAM spiral wave-front. Then the radiant principle of a holographic antenna is introduced. Through the derivation, we obtain the formula of three-dimensional phase distribution on this conformal metasurface, and the simulation results are consistent with expected effects.

关键词： Spirals Surface waves Simulation Metasurfaces Microwave theory and techniques Electric fields Antennas

来源：评论

学校读者我要写书评

暂无评论

Low Complexity Joint User Scheduling and Hybrid Beamforming for mmWave Massive MIMO systems

Low Complexity Joint User Scheduling and Hybrid Beamforming ...

引用

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Xiaomeng Gao Xiaoyong Wu Zhilong Zhang Danpu Liu Beijing University of Posts and Telecommunications Beijing P. R. China Shanghai Radio Equipment Research Institute P.R. China Beijing Laboratory of Advanced Information Network Beijing Key Laboratory of Network System Architecture and Convergence

ISBN: (数字)9781728144900

ISBN: (纸本)9781728144917

Codebook-based hybrid analog and digital beam-forming (HBF) plays a key role in practical millimeter wave (mmWave) massive MIMO systems. Most existing work focuses on the design of analog beams, without considering the coupled relationship between beam selection and user scheduling. In this paper, we consider a downlink HBF system and address the aforementioned problem. By exploiting the orthogonality of the Discrete Fourier Transform (DFT) codebook, we propose two low complexity approaches named as E-DFT and PF-DFT according to different requirements. Specifically, E-DFT aims to maximize the sum achievable rate of the HBF system, and PF-DFT considers both the system throughput and user fairness. Simulation results show that our proposed E-DFT scheme outperforms the baseline methods in the literature, and achieves near optimal sum rate. Meanwhile, the PF-DFT scheme performs better in balancing the achievable rate and scheduling fairness.

关键词： Radio frequency Array signal processing NIST MIMO communication Complexity theory Discrete Fourier transforms Baseband

来源：评论

学校读者我要写书评

暂无评论

Towards Secure Semantic Transmission In the Era of GenAI: A Diffusion-based Framework

arXiv

引用

arXiv 2025年

作者： He, Boxiang Chen, Zihan Luo, Junshan Liu, Chuanhong Wang, Shilian Wang, Fanggang Quek, Tony Q.S. College of Electronic Science and Technology National University of Defense Technology Changsha410073 China Information Systems Technology and Design Singapore University of Technology and Design Singapore Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China School of Electronic and Information Engineering Beijing Jiaotong University Beijing100044 China

Semantic communication, due to its focus on the transmitting meaning rather than the raw bit data, poses unique security challenges compared to the traditional communication systems. In particular, semantic communication systems are vulnerable to the malicious attacks that focus on the semantic layer, with the intention of understanding or distorting the intended meaning of the transmitted privacy data. Diffusion models, a class of generative artificial intelligence (GenAI), are well-suited for ensuring data security to attack. Through iteratively adding and then removing noise, diffusion models can generate meaningful information despite the presence of the unknown noise. This article proposes a diffusion-based framework to enhance the security of semantic transmission for the attacks including eavesdropping and jamming. Specifically, the proposed framework incorporates both the artificial noise and natural channel noise into the forward process of the diffusion models during the semantic transmission, with the reverse process used to remove noise at the legitimate receiver. In the eavesdropping scenarios, the artificial noise is the friendly noise designed to prevent semantic eavesdropping. In the jamming scenarios, the artificial noise is the malicious jamming generated by the jammer, which disrupts the semantic transmission. The case studies show that the proposed diffusion-based framework is promising in securing the semantic transmission. We also consolidate several broad research directions associated with the proposed framework. Copyright © 2025, The Authors. All rights reserved.

关键词： Electroosmosis

来源：评论

学校读者我要写书评

暂无评论

Joint resource management for MC-NOMA: A deep reinforcement learning approach

arXiv

引用

arXiv 2021年

作者： Wang, Shaoyang Lv, Tiejun Ni, Wei Beaulieu, Norman C. Guo, Y. Jay Key Laboratory of Trustworthy Distributed Computing and Service Ministry of Education School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China Sydney2122 Australia Beijing Key Laboratory for Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing100876 China Global Big Data Technologies Centre University of Technology Sydney UltimoNSW2007 Australia

This paper presents a novel and effective deep reinforcement learning (DRL)-based approach to addressing joint resource management (JRM) in a practical multi-carrier non-orthogonal multiple access (MC-NOMA) system, where hardware sensitivity and imperfect successive interference cancellation (SIC) are considered. We first formulate the JRM problem to maximize the weighted-sum system throughput. Then, the JRM problem is decoupled into two iterative subtasks: subcarrier assignment (SA, including user grouping) and power allocation (PA). Each subtask is a sequential decision process. Invoking a deep deterministic policy gradient algorithm, our proposed DRL-based JRM (DRL-JRM) approach jointly performs the two subtasks, where the optimization objective and constraints of the subtasks are addressed by a new joint reward and internal reward mechanism. A multi-agent structure and a convolutional neural network are adopted to reduce the complexity of the PA subtask. We also tailor the neural network structure for the stability and convergence of DRL-JRM. Corroborated by extensive experiments, the proposed DRL-JRM scheme is superior to existing alternatives in terms of system throughput and resistance to interference, especially in the presence of many users and strong inter-cell interference. DRL-JRM can flexibly meet individual service requirements of users. © 2021, CC BY.

关键词： Resource allocation

来源：评论

学校读者我要写书评

暂无评论

A novel received signal strength assisted perspective-three-point algorithm for indoor visible light positioning

arXiv

引用

arXiv 2020年

作者： Bai, Lin Yang, Yang Feng, Chunyan Guo, Caili Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing University of Posts and Telecommunications Beijing Laboratory of Advanced Information Networks School of Information and Communication Engineering Beijing University of Posts and Telecommunications

In this paper, a received signal strength assisted Perspective-three-Point positioning algorithm (R-P3P) is proposed for visible light positioning (VLP) systems. The basic idea of R-P3P is to joint visual and strength information to estimate the receiver position using 3 LEDs regardless of the LEDs' orientations. R-P3P first utilizes visual information captured by the camera to estimate the incidence angles of visible lights. Then, R-P3P calculates the candidate distances between the LEDs and the receiver based on the law of cosines and Wu-Ritt's zero decomposition method. Based on the incidence angles, the candidate distances and the physical characteristics of the LEDs, R-P3P can select the exact distances from all the candidate distances. Finally, the linear least square (LLS) method is employed to estimate the position of the receiver. Due to the combination of visual and strength information of visible light signals, R-P3P can achieve high accuracy using 3 LEDs regardless of the LEDs' orientations. Simulation results show that R-P3P can achieve positioning accuracy within 10 cm over 70% indoor area with low complexity regardless of LEDs orientations. Copyright © 2020, The Authors. All rights reserved.

关键词： Light emitting diodes

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：