检索结果-南通市图书馆

New dynamic routing algorithm based on MANET in the LEO/MEO satellite network

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Electrical and Electronic Engineering in China 2006年第2期1卷 164-170页

作者： LI Zhe LI Dong-ni WANG Guang-xing Research Center for Network and communication of Northeastern University Shenyang 11004China

The features of low earth orbit/medium earth orbit(LEO/MEO)satellite networks routing algorithm based on inter-satellite link are analyzed and the similarities between satellite networks and mobile Ad Hoc network(MANET)are pointed *** similar parts in MANET routing protocol are used in the satellite network for reference.A new dynamic routing algorithm based on MANET in LEO/MEO satellite networks,which fits for the LEO/MEO satellite communication system,is *** the same time,the model of the algorithm is simulated and features are *** is shown that the algorithm has strong *** can give the network high autonomy,perfect function,low system overhead and great compatibility.

关键词： Computer application technology LEO/MEO satellite network MANET Inter-satellite link(ISL) Cluster

PERFORMANCES OF ADAPTIVE MODULATION AND CODING IN satellite mobile CHANNEL

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2011年第2期28卷 181-186页

作者： Yu Fangyuan Yang Mingchuan Guo Qing communication Research Center Harbin Institute of Technology Harbin 150001 China

Given that satellite mobile channel is a time-varying channel,Adaptive Modulation and Coding(AMC) was proposed to provide robust and spectrally efficient transmission over satellite mobile *** different kinds of channel environment were considered in this paper:the urban area,the rural area,and the open *** combinations of modulation and coding were designed to meet reliable communication on time-varying channel,and spectral efficiency and system throughput of these three kinds of channel environment were *** on the simulation results,this paper analysed the results and compared the performances of AMC with non-AMC system in these three kinds of channel *** last,we come to the conclusions:a system with AMC can achieve higher spectral efficiency and better system throughput;and the spectral efficiency and system throughput of AMC system will be higher on better satellite mobile channel.

关键词： Adaptive Modulation and Coding(AMC) satellite mobile channel Spectral efficiency System throughput

A NOVEL MODULATION FOR mobile satellite communicationS

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2011年第2期28卷 174-180页

作者： Xie Zhidong Bian Dongming Hu Jing Sun Qian Institute of communication Engineering PLA University of Science and Technology Nanjing 210007 China

It is a challenging problem to design a high performance modulation for mobile satellite communications due to the limited power and bandwidth *** paper improves Feher patented Quadrature Phase Shift Keying(FQPSK) by redefining the *** novel FQPSK,with con-stant envelope,can be used to improve the power efficiency and frequency efficiency of mobile satellite *** study shows that the improved FQPSK outperforms conventional FQPSK over AWGN and is immune to the non-linearity of high power *** last,the impact of flat fading and multi-path fading of channel on the BER performance of improved modulation is analyzed.

关键词： mobile satellite communication Modulation Feher Quadrature Phase Shift Keying(FQPSK) Fading

State Machine with Tracking Tree and Traffic Allocation Scheme Based on Cumulative Entropy for satellite Network

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2020年第1期29卷 183-189页

作者： LIN Wenliang WANG Huijun DENG Zhongliang WANG Ke ZHOU Xiaotian The School of Electronic Engineering Beijing University of Posts and Telecommunications Science and Technology on communication Networks Laboratory 54th Institute CETC Chinese Institute of Electronics

satellite network is regarded as an important component of 5 th Generation(5 G). New deployment scenarios have been designed in form of satellite network fused 5 G terrestrial network. Service requests in Non terrestrial networks(NTN) are noncentralized in the time and space domain, which cause services modelling uncertain and lack of balance between latency and bandwidth. Targeted at those bottlenecks,a satellite service model based on State machine with tracking tree(SM-SMTT) and traffic allocation scheme base on cumulative entropy is proposed. Enhanced mobile broadband service, low latency service and massive machine type communications in satellite will be modelled by SM-SMTT. Cumulative entropy is introduced as the criterion to allocate traffic. According to the lower bound from cumulative entropy, the balance of latency and bandwidth is achieved in different deployment *** simulation in OPNET, demonstrations the new scheme has promoted the performance of delay and bandwidth utilization by 37.8% and 12.0%.

关键词： Heterogeneous network Traffic congestion Channel utilization OPNET

SER PERFORMANCE ANALYSIS OF DECODE-AND-FORWARD COOPERATIVE SCHEME IN satellite mobile CHANNEL

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2011年第2期28卷 215-221页

作者： Jie Xiao Zhang Gengxin Zang Guozhen Feng Shaodong Institute of communication Engineering PLA University of Science and Technology Nanjing 210007 China

In this paper,Symbol-Error-Rate(SER) performance analysis is provided for a Decode-and-Forward(DF) cooperative scheme in satellite mobile channel *** present a satellite mobile cooperative communication system model and derive two generalized error probability ex-pressions with Cyclical Redundancy Check(CRC) or *** also derive and simulate SER of the proposed system over different satellite mobile *** results show that the analytical results are in great accordance with the ones obtained by ***,it was shown that,whether or not adopt CRC depends on the channel link quality between the source node and the relay node.

关键词： satellite communication Cooperative communication Decode-and-Forward(DF)

Towards 6G wireless communication networks:vision, enabling technologies, and new paradigm shifts

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2021年第1期64卷 5-78页

作者： Xiaohu YOU Cheng-Xiang WANG Jie HUANG Xiqi GAO Zaichen ZHANG Mao WANG Yongming HUANG Chuan ZHANG Yanxiang JIANG Jiaheng WANG Min ZHU Bin SHENG Dongming WANG Zhiwen PAN Pengcheng ZHU Yang YANG Zening LIU Ping ZHANG Xiaofeng TAO Shaoqian LI Zhi CHEN Xinying MA Chih-Lin I Shuangfeng HAN Ke LI Chengkang PAN Zhimin ZHENG Lajos HANZO Xuemin (Sherman) SHEN Yingjie Jay GUO Zhiguo DING Harald HAAS Wen TONG Peiying ZHU Ganghua YANG Jun WANG Erik G.LARSSON Hien Quoc NGO Wei HONG Haiming WANG Debin HOU Jixin CHEN Zhe CHEN Zhangcheng HAO Geoffrey Ye LI Rahim TAFAZOLLI Yue GAO H.Vincent POOR Gerhard P.FETTWEIS Ying-Chang LIANG National mobile communications Research Laboratory School of Information Science and EngineeringSoutheast University Purple Mountain Laboratories Shanghai Institute of Fog Computing Technology (SHIFT) ShanghaiTech University Research Center for Network communication Peng Cheng Laboratory State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications National Engineering Laboratory for mobile Network Technologies Beijing University of Posts and Telecommunications National Key Laboratory of Science and Technology on communications University of Electronic Science and Technology of China (UESTC) China mobile Research Institute School of Electronics and Computer Science University of Southampton Department of Electrical and Computer Engineering University of Waterloo Global Big Data Technologies Centre (GBDTC) University of Technology Sydney School of Electrical and Electronic Engineering The University of Manchester LiFi Research and Development Centre Institute for Digital CommunicationsSchool of EngineeringThe University of Edinburgh Huawei Technologies Canada Co. Ltd. Huawei Technologies Department of Electrical Engineering (ISY) Link?ping University Institute of Electronics Communications & Information Technology (ECIT)Queen's University Belfast State Key Laboratory of Millimeter Waves School of Information Science and EngineeringSoutheast University School of Electrical and Computer Engineering Georgia Institute of Technology 5G Innovation Centre University of Surrey Princeton University Vodafone Chair mobile communications Systems Technische Universit?t Dresden Center for Intelligent Networking and communications (CINC) University of Electronic Science and Technology of China (UESTC)

The fifth generation(5G) wireless communication networks are being deployed worldwide from 2020 and more capabilities are in the process of being standardized, such as mass connectivity, ultra-reliability,and guaranteed low latency. However, 5G will not meet all requirements of the future in 2030 and beyond, and sixth generation(6G) wireless communication networks are expected to provide global coverage, enhanced spectral/energy/cost efficiency, better intelligence level and security, etc. To meet these requirements, 6G networks will rely on new enabling technologies, i.e., air interface and transmission technologies and novel network architecture, such as waveform design, multiple access, channel coding schemes, multi-antenna technologies, network slicing, cell-free architecture, and cloud/fog/edge computing. Our vision on 6G is that it will have four new paradigm shifts. First, to satisfy the requirement of global coverage, 6G will not be limited to terrestrial communication networks, which will need to be complemented with non-terrestrial networks such as satellite and unmanned aerial vehicle(UAV) communication networks, thus achieving a space-airground-sea integrated communication network. Second, all spectra will be fully explored to further increase data rates and connection density, including the sub-6GHz, millimeter wave(mmWave), terahertz(THz),and optical frequency bands. Third, facing the big datasets generated by the use of extremely heterogeneous networks, diverse communication scenarios, large numbers of antennas, wide bandwidths, and new service requirements, 6G networks will enable a new range of smart applications with the aid of artificial intelligence(AI) and big data technologies. Fourth, network security will have to be strengthened when developing 6G networks. This article provides a comprehensive survey of recent advances and future trends in these four aspects. Clearly, 6G with additional technical requirements beyond those of 5G will enable f

关键词： 6G vision network architecture air interface and transmission technologies space-air-ground-sea integrated network all spectra artificial intelligence network security.

Software-Defined Space-Air-Ground Integrated Network Architecture with the Multi-Layer satellite Backbone Network

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2020年第7期64卷 527-540页

作者： Chao Guo Cheng Gong Juan Guo Zhanzhen Wei Yanyan Han Sher Zaman Khan Department of Electronics and communication Engineering Beijing Electronics Science and Technology InstituteBeijing100070China School of Computer and communication Engineering University of Science and Technology BeijingBeijing100083China Vocational and Technical College of Guilin University of Electronic Technology Beihai536000China Institute of Business Administration Gomal UniversityDera Ismail Khan29220Pakistan

Under the background of the rapid development of ground mobile communication,the advantages of high coverage,survivability,and flexibility of satellite communication provide air support to the construction of space information *** to the requirements of the future space information communication,a software-defined Space-Air-Ground Integrated network architecture was *** consisted of layered structure satellite backbone network,deep space communication network,the stratosphere communication network and the ground *** Space-Air-Ground Integrated network was supported by the satellite backbone *** provided data relay for the missions such as deep space exploration and controlled the deep-space spacecraft when *** addition,it safeguarded the anti-destructibility of stratospheric communication and assisted the stratosphere to supplement ground network *** this paper,algorithm requirements of the congestion control and routing of satellite backbone protocols for heterogeneous users’services were *** algorithm requirements of distinguishing different service objects for the deep space communication and stratospheric communication network protocols were *** the realistic demand for the dynamic coverage of the satellite backbone network and node cost,the multi-layer satellite backbone network architecture was *** this basis,the proposed Software-defined Space-Air-Ground Integrated network architecture could be built as a large,scalable and efficient communication network that could be integrated into space,air,and ground.

关键词： Space-Air-Ground integrated network network architecture software-defined network multi-layer satellite backbone network

A novel OFDM transmission scheme with length-adaptive Cyclic Prefix

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2004年第11期5卷 25-31页

作者：张朝阳赖利峰 Hangzhou 310027 Institute of Information and communication Engineering China Zhejiang University

Conventional OFDM transmission system uses a fixed-length Cyclic Prefix to counteract Inter-Symbol Inter- ferences (ISI) caused by channel delay spreading under wireless mobile environment. This may cause considerable per- formance deterioration when the CP length is less than the channel RMS delay spread, or may decrease the system power and spectrum efficiency when it is much larger. A novel Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme is proposed in this paper to adapt the CP length to the variation of channel delay spread. AOFDM-VCPL utilizes the preamble or pilot sub-carriers of each OFDM packet to estimate the channel RMS delay spread; and then uses a criterion to calculate the CP length , which finally affects the OFDM transmitter. As illustrated in the simulation section, by deploying this scheme in a typical wireless environment, the system can transmit at data rate 11.5 Mb/s higher than conventional non-adaptive system while gaining a 0.65 dB power saving at the same BER performance.

关键词： Adaptive OFDM Cyclic Prefix RMS delay spread

Study on Security of 5G and satellite Converged communication Network

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

ZTE communications 2021年第4期19卷 79-89页

作者： YAN Xincheng TENG Huiyun PING Li JIANG Zhihong ZHOU Na State Key Laboratory of mobile Network and mobile Multimedia Technology Shenzhen 518055China ZTE Corporation Shenzhen 518057China

The 5G and satellite converged communication network(5G SCCN)is an impor⁃tant component of the integration of satellite-terrestrial networks,the national science,and technology major projects towards *** is the key to ensuring its operation,but at present,the research in this area has just started in our *** on the network char⁃acteristics and security risks,we propose the security architecture of the 5G SCCN and sys⁃tematically sort out the key protection technologies and improvement *** particu⁃lar,unique thinking on the security of lightweight data communication and design reference for the 5G SCCN network architecture is *** is expected to provide a piece of refer⁃ence for the follow-up 5G SCCN security technology research,standard evolution,and indus⁃trialization.

关键词： 5G SCCN non-terrestrial networks 5G security satellite security integration of satellite-terrestrial networks