检索结果-南通市图书馆

Key technologies for wireless network digital twin towards smart railways

High-Speed Railway 2024年第1期2卷 1-10页

作者： Ke Guan Xinghai Guo Danping He Philipp Svoboda Marion Berbineau Stephen Wang Bo Ai zhangdui zhong Markus Rupp State Key Laboratory of Advanced Rail Autonomous Operation Beijing Jiaotong UniversityBeijing 100044China School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China Christian Doppler Laboratory for Digital Twin Assisted AI for Sustainable Radio Access Networks Institute of TelecommunicationsTU WienVienna 1040Austria UniversitéGustave Eiffel COSYSLEOSTVilleneuve d′Ascq 59650France VIAVI Marconi Labs VIAVI SolutionsStevenage SG12ANUK Institute of Telecommunications TU WienVienna 1040Austria

An emerging railway technology called smart railway promises to deliver higher transportation efficiency,enhanced comfort in services,and greater *** smart railway is expected to integrate fifth-generation mobile communication(5G),Artificial Intelligence(AI),and other technologies,which poses new problems in the construction,operation and maintenance of railway wireless *** Digital Twins(DTs),which have recently emerged as a new paradigm for the design of wireless networks,can address these problems and enable the whole lifecycle management of railway wireless ***,there are still many scientific issues and challenges for railway-oriented wireless *** key technologies to solve these problems are introduced and described,including characterization of materials'physical-EM properties,autonomous reconstruction of Three-dimensional(3D)environment model,AI-empowered environmental cognition,Ray-Tracing(RT),model-based and AIbased RT acceleration,and generation of multi-spectra sensing ***,this paper presents our research results for each key technology and describes the wireless network planning and optimization system based on highperformance RT developed by our *** paper outlines the framework for realizing the wireless DT of smart railways,providing the direction for future research.

关键词： Digital twin Smart railways Ray tracing Channel characterization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

从2B到4B——电信行业与垂直行业的供需协同倍增发展

引用

中兴通讯技术 2024年第S01期30卷 67-75页

作者：钟章队官科丁建文陈姝北京交通大学电子信息工程学院中国北京100044 北京交通大学宽带移动信息通信铁路行业重点实验室中国北京100044 轨道交通安全协同创新中心中国北京100044 智慧高铁系统前沿科学中心中国北京100044 佳讯飞鸿(北京)智能科技研究院有限公司中国北京100044

为更好地发展下一代移动通信技术,加快5G/6G建设,需将发力点由“面向企业”的2B(To Business)向“为了企业”的4B(For Business)转变。从2B到4B,是从供给侧主导向需求侧主导的转变,是从“供给外生赋能”向“供需内生协同”本质的转变。... 详细信息

为更好地发展下一代移动通信技术,加快5G/6G建设,需将发力点由“面向企业”的2B(To Business)向“为了企业”的4B(For Business)转变。从2B到4B,是从供给侧主导向需求侧主导的转变,是从“供给外生赋能”向“供需内生协同”本质的转变。发展5G/6G公专网,需要树立全生命周期的可持续发展理念,深度理解目标企业的核心诉求,充分发挥企业的主体作用。应由垂直行业主导公专网应用的标准制定与生态建设,设计可复制、可定义的商业模式,从顶层设计开始,将数字技术融入到垂直行业数字化转型之中,实现5G/6G公专网发展从2B到4B的转变,创造电信行业与垂直行业供需协同、价值倍增的可持续发展模式。

关键词： 5G 6G 2B 4B 垂直行业公专网

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Contention-Based Nonorthogonal Massive Access with Massive MIMO

引用

China Communications 2020年第11期17卷 79-90页

作者： Yanna Bai Wei Chen Bo Ai zhangdui zhong State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100044China Beijing Engineering Research Center of High-speed Railway Broadband Mobile Communications Beijing 100044China

The sporadic communication character of massive machine-type communication systems provides natural advantages to utilize the principle of compressive sensing(CS).However,due to the high computational complexity of CS algorithms,CS-based contention-free access schemes have limited scalability and high computational complexity for massive access with user-specific *** address these problems,in this paper,we propose a new contention-based scheme for CSbased massive access,which can support the sporadic access of massive devices(more than one million devices)with limited ***,an advanced receiver algorithm is designed to solve the optimal solutions for the proposed scheme,which utilizes various prior information to enhance the *** specific,the joint sparsity between the channel and data is used to improve the accuracy of pilot detection,and the information of modulation and cyclic redundancy check is exploited for channel correction to improve the performance of data *** simulation results show that the proposed scheme can achieve improved active user detection performance and data recovery accuracy than existing methods.

关键词： massive machine-type communication nonorthogonal access compressive sensing contention based access

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Green Circuit Design for Battery-Free Sensors in Cloud Radio Access Network

引用

China Communications 2015年第11期12卷 1-11页

作者： ZENG Tengchan MA Zhen WANG Gongpu zhong zhangdui School of Electronic and Information Engineering Beijing Jiaotong University School of Computer and Information Technology Beijing Jiaotong University

Cloud radio access network(C-RAN)is considered as a promising approach to solve the bandwidth crunch problem for future wireless network. Another important element for future network is sensors that can monitor physical or environmental conditions. Currently,most sensors need batteries for power,which is energy-consuming and maintenance-heavy. To further improve energy effi ciency(EE) of sensors in C-RAN,this paper proposes a new structure as well as practical circuit design for green sensors in C-RAN. The structure can enable sensors to harvest energy from radio signals transmitted by neighbor remote radio heads(RRHs) and user terminals(UTs). To demonstrate the validity of the new structure,a practical circuit design is suggested and the corresponding hardware platform is realized. Specifically,selection criteria for electrical component parameters and design of an impedance-matching network are discussed in details. In addition,two methods to stabilize the output voltage are proposed and analyzed. Finally,simulation results as well as experimental results are provided to corroborate our proposed studies.

关键词： energy harvesting C-RAN batteryfree sensor energy eff iciency

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Towards 6G: Paradigm of Realistic Terahertz Channel Modeling

引用

China Communications 2021年第5期18卷 1-18页

作者： Ke Guan Haofan Yi Danping He Bo Ai zhangdui zhong State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100044China Beijing Engineering Research Center of High-speed Railway Broadband Mobile Communications Beijing 100044China

Terahertz(THz)communications are envisioned as a key technology for the sixth-generation wireless communication system(6G).However,it is not practical to perform large-scale channel measurements with high degrees of freedom at THz frequency *** makes empirical or stochastic modeling approaches relying on measurements no longer *** order to break through the bottleneck of scarce fulldimensional channel sounding measurements,this paper presents a novel paradigm for THz channel modeling towards *** the core of high-performance ray tracing(RT),the presented paradigm requires merely quite limited channel sounding to calibrate the geometry and material electromagnetic(EM)properties of the three-dimensional(3D)environment model in the target ***,through extensive RT simulations,the parameters extracted from RT simulations can be fed into either ray-based novel stochastic channel models or cluster-based standard channel model *** by RT simulations,these models can generate realistic channels that are valuable for the design and evaluation of THz *** two ends of 6G THz use cases from microscopy to macroscopy,case studies are made for close-proximity communications,wireless connections on a desktop,and smart rail mobility,*** but not least,new concerns on channel modeling resulting from distinguishing features of THz wave are discussed regarding propagation,antenna array,and device aspects,respectively.

关键词： channel modeling channel sounding raytracing THz communication 6G

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于云平台的铁路无线电信号DOA跟踪算法

引用

北京交通大学学报 2024年第2期48卷 115-121页

作者：代赛孙宵芳左莹吴欣蒙丁建文孙斌钟章队中铁第四勘察设计院集团有限公司武汉430063 北京交通大学电子信息工程学院北京100044 中国移动通信集团设计院有限公司北京100080

在高速铁路场景下,准确估计和跟踪无线电信号的波达方向(Direction of Arrival, DOA)能够有效提升无线通信服务质量.然而,高速移动的无线信道具有快速时变特性,对信号处理的速度和准确性提出了更高的挑战.针对传统的基于信号子空间的DO... 详细信息

在高速铁路场景下,准确估计和跟踪无线电信号的波达方向(Direction of Arrival, DOA)能够有效提升无线通信服务质量.然而,高速移动的无线信道具有快速时变特性,对信号处理的速度和准确性提出了更高的挑战.针对传统的基于信号子空间的DOA估计算法,由于巨大的计算量而无法应用于高速铁路快速时变系统中进行DOA跟踪的问题,提出了基于卡尔曼滤波和正交压缩近似投影子空间跟踪(Kalman Filter-Orthonormal Projection Approximation and Subspace Tracking of deflation, K-OPASTd)的DOA算法.首先,搭建基于云平台的铁路信号动态测向系统;然后,建立列车接收信号模型,提出K-OPASTd算法对DOA进行动态跟踪;最后,将本文提出的算法与OPASTd算法所得到的估计角度的均方根误差进行仿真对比实验.研究结果表明:信噪比均为10dB时,本文所提算法的均方根误差比OPASTd算法低约60%;阵元均为20时,K-OPASTd算法的均方根误差比OPASTd算法低约80%.

关键词：波达方向跟踪正交压缩近似投影子空间跟踪卡尔曼滤波云平台

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Coalition Game Based Full-Duplex Concurrent Scheduling in Millimeter Wave Wireless Backhaul Network

引用

China Communications 2019年第2期16卷 59-75页

作者： Haiyan Jiang Yong Niu Jiayi Zhang Bo Ai zhangdui zhong The State Key Laboratory of Rail Traffic Control and Safety and the School of Electronic and Information EngineeringBeijing Jiaotong University

With the development of self-interference(SI) cancelation technology, full-duplex(FD) communication becomes possible. FD communication can theoretically double the spectral efficiency. When the time slot(TS) resources are limited and the number of flows is large, the scheduling mechanism of the flows becomes more important. Therefore, the effectiveness of FD scheduling mechanism for the flows is studied in millimeter wave wireless backhaul network with the limited TS resources. We proposed a full duplex concurrent scheduling algorithm based on coalition game(FDCG) to maximize the number of flows with their QoS requirements satisfied. We transformed the problem of maximizing the number of flows with their QoS requirements satisfied into the problem of maximizing sum rate of concurrently scheduled flows in each slot. We obtained the scheduled flows with maximum sum rate in first slot by using coalition *** then with certain restrictions, the maximum sum rate of concurrently scheduled flows can also be achieved in subsequent time slots. The simulation results show that the proposed FDCG algorithm canachieve superior performance in terms of the number of flows that meet their QoS requirements and system throughput compared with other three algorithms.

关键词： millimeter wave wireless backhaul network coalition game concurrent scheduling maximum sum rate

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Multi-Frequency Channel Characterization for Massive MIMO Communications in Lobby Environment

引用

China Communications 2019年第9期16卷 79-92页

作者： Jianzhi Li Bo Ai Ruisi He Mi Yang zhangdui zhong State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University

In this paper,a massive multiple input multiple output(MIMO)channel measurement campaign with two setups is conducted in an indoor lobby *** the first setup,two types of 256-element virtual uniform rectangular arrays(URAs),i.e.,the 4×64 virtual URA and the 64×4 virtual URA are *** carrier frequency is 11 GHz;in the second setup,measurements are performed at 4,6,11,13,15,18 GHz at two different user *** channel characterization is presented by investigating the typical channel parameters,including average power delay profile(APDP),K factor,root mean square(RMS)delay spread,and coherence ***,the channel characteristics in angular domain are investigated by applying the space-alternating generalized expectation-maximization(SAGE)*** extracted multipath components(MPCs)are preliminarily clustered by visual inspection,and related to the interacting objects(IOs)in physical *** structures at multiple frequency bands are *** spread of departure is estimated to evaluate the directional dispersion at the base station(BS)*** results in this paper can help to reveal the propagation mechanisms in massive MIMO channels,and provide a foundation for the design and application of the practical massive MIMO system.

关键词： 5G Massive MIMO channelmeasurement virtual array SAGE K factor RMS delay spread coherence bandwidth scatterer localization direction spread

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

移动通信网中加密算法演进及其在铁路5G-R应用展望

引用

中国铁路 2024年第8期 69-76页

作者：戴蕊钟章队孙宵芳吴昊刘艳兵丁建文北京交通大学电子信息工程学院北京六捷科技有限公司

加密算法是保障移动通信网络安全不可或缺的一环。随着5G技术的迅猛发展，加密算法与时俱进，相继引入了SNOW 3G算法、高级加密标准（AES）和祖冲之算法（ZUC）。铁路5G专用无线通信系统（5G-R）中加密算法的应用，不仅有助于保护铁路... 详细信息

加密算法是保障移动通信网络安全不可或缺的一环。随着5G技术的迅猛发展，加密算法与时俱进，相继引入了SNOW 3G算法、高级加密标准（AES）和祖冲之算法（ZUC）。铁路5G专用无线通信系统（5G-R）中加密算法的应用，不仅有助于保护铁路通信数据的机密性，防止信息泄露，还能通过身份验证和数据完整性校验，确保通信的可靠性和真实性。介绍加密算法在移动通信网络中的发展历程和应用场景，分析未来铁路专用移动通信网络安全性的挑战，同时结合下一代铁路通信的需求，探讨加密算法在5G-R专网中的应用。

关键词：加密算法通信安全 5G 5G-R 铁路专网无线通信

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

基于散射特性的太赫兹信道建模

引用

无线电通信技术 2024年第1期50卷 114-120页

作者：潘然何丹萍官科彭彼乐窦建武郭兰图钟章队北京交通大学电子信息工程学院北京100044 北京交通大学先进轨道交通自主运行全国重点实验室北京100044 布伦瑞克工业大学信息所德国布伦瑞克38106 移动网络和移动多媒体技术国家重点实验室广东深圳518055 中兴通讯股份有限公司广东深圳518057 中国电波传播研究所山东青岛266107

太赫兹(Terahertz, THz)通信是6G的关键技术之一。由于太赫兹技术具有大带宽和超高速率的特点,越来越受到关注。为支持太赫兹无线通信设备的性能评估,建立能够表征信道特性的无线信道模型至关重要。提出了一种基于散射特性的太赫兹信道... 详细信息

太赫兹(Terahertz, THz)通信是6G的关键技术之一。由于太赫兹技术具有大带宽和超高速率的特点,越来越受到关注。为支持太赫兹无线通信设备的性能评估,建立能够表征信道特性的无线信道模型至关重要。提出了一种基于散射特性的太赫兹信道模型,在室内场景中使用该信道模型生成信道系数和功率时延谱。分析结果表明,提出的信道模型能较好地表征太赫兹散射特性,能够支持太赫兹通信系统的设计与评估。

关键词：信道建模信道系数散射特性太赫兹 6G

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：