车联网通信技术简析

作为下一代智能交通的核心,车联网的研究为智能交通系统提供了解决方案。车联网通信的模式具体分为三种:车与车通信(V2V),车与路边基础设施通信(V2I),车与行人通信(V2P)三类,这三类统称为Vehicle to Everything(V2X)通信。本文对车联网中的上述三种通信模式作了简要的介绍和分析。     

车联网产业进展及关键技术分析

车联网正在从以车载信息服务为主向以支持辅助驾驶、自动驾驶和智慧交通的应用发展,车联网的通信也从车到网络(V2N)向车到车(V2V)、车到基础设施(V2I)、车到行人(V2P)扩展。介绍了车联网的产业及标准进展,分析了车联网典型场景及应用需求和关键技术。     

车联网信道特性综述

信道建模是设计无线通信系统的基础,为设计智慧交通系统,必须对车联网(vehicle to everything,V2X)信道进行深入研究.文中首先总结了 V2X标准化信道的特点,讨论了天线设置、非平稳特性以及毫米波对V2X信道的影响;然后对车与车(vehicle to vehicle,V2V)信道参数进行了描述,并分析...     

基于DSRC交通路口的车联网的研究

首先阐述了车联网的一些概念,车联网是一种物联网,是在道路交通网络中的具体应用,并从车联网的三个层次,感知层、网络层和云平台进行阐述。接着介绍了车载专用短程通讯技术(Dedicated Short Range Communication,DSRC)中的IEEE802.11p协议和IEEE1609标准,其中IEEE802.11p是从IEEE802.11协议扩充来的,IEEE1609标准为车载网络提供了有效的存取方式。最后针对交通路口的事故频发的问题,提出了一种基于DSRC技术的智能交通路口模型的车联网解决方案。     

V2X技术发展历程及应用研究

V2X车联网技术作为物联网的具体应用,同时在智能交通系统中发挥着巨大的作用.随着科技的不断发展,V2X技术在中国也得到了飞快的提升.本文通过对V2X技术的分析与讨论,对现有的V2X技术进行了一个总结.首先通过分析V2X概念及车联网的Ad hoc网络结构与分层网架构,进一步介绍了V2X车联网技术在国内外的发展情况,并阐述了V2X在实际交通中的几个重要应用,最后通过分析车联网在技术上的关键问题,希望能为车联网的进一步研究提供方向.     

车载自组织网络应用服务原型系统的设计

车载自组织网络中主要采用下列两种方式进行通信:(1)车辆与车辆间(Vehicular toVehicular)之间的通信,简称V2V;(2)车辆与基础设施间(Vehicular toinfrastructure)之间的通信,简称V2I。该文研究基于3G和WLAN两种通信方式实现V2V和V2I的车载应用服务原型系统,其主要研究内容包括:(1)提出了系统通信技术方案,为车载自组织网络应用服务系统提供技术支撑;(2)提出了基于现状的车载网系统架构设计并给出应用服务原型系统。该文对车载应用服务系统的实用化进行了一定的探索。     

车联网的关键技术及应用研究﹡

车联网作为物联网的衍生品,在未来智能交通中将发挥极其重要的作用,是人们未来生活中不可缺少的一个重要组成部分.首先介绍了从物联网到车联网的发展过程,诠释了车联网的概念、分层的体系架构以及构成要素,通过与现有的智能交通系统、车载信息终端以及车辆自组织网络等几种车辆控制系统进行对比,分析了车联网独有的特点和优势所在,指出了车联网发展的几个关键技术,最后通过一个案例对车联网的应用进行了展望.     

浅谈无线通信技术在车联网中的应用

车联网是物联网在智能交通领域的典型应用,车联网中的核心关键技术是无线通信技术。无线通信技术决定了车辆的车内网、车际网和车载移动互联网等网络间大范围、大容量数据的交互、共享的实时性和有效性,是当前国内外技术演进的研究热点。随着工业化和信息化在国民生产领域的深度融合,信息化技术不断深入到工业化领域,车联网引导的智能交通越发成熟。     

车联网关键技术及其发展趋势与挑战

车联网是未来智能交通的重要组成部分,也是目前国内外研究的热点问题.围绕车联网,综述了其关键技术及其研究进展,并展望了该领域的发展趋势及其挑战.车联网由感知层、网络层和应用层组成,利用V2X技术实现人、车、路、云之间的信息交互.车内网通过整体感知、定位和语音识别等技术来构建单车网络;车际网通过移动边缘计算、软件定义网络、...     

车联网行业正“开花结果”LTE-V解决方案大步前行

随着交通拥堵问题日益突出,作为物联网重要分支之一的车联网越来越引起社会各界的关注.其中,LTE-V是我国主导的基于LTE蜂窝网络的车对外界信息交互(V2X)技术,是现有蜂窝网络技术的延伸. 主动安全是LTE-V的核心.利用移动宽带网络,LTE-V实现了车与车、车与路、车与人的完美协同,还可实现智能交通管控,使整个城市的交通效率和资源分配变得更为合理和高效.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.