ITS智能交通中的DSRC技术

DSRC专用短程通信技术是随着ITS智能交通的发展和EFCE电子(自动)收费应用的要求而提出发展起来的，本文主要介绍DSRC技术和其在EFC领域的应用。     

专用短程通信(DSRC)协议研究及应用展望

DSRC技术是ITS的底层核心技术,为车路之间提供通信链路.本文简单介绍了DSRC发展状况,分析了DSRC协议栈、系统网络结构和通信过程,阐述了DSRC三层功能和数据单元格式,最后提出了可行的DSRC通信连接实现方式及有待解决的重要问题.     

ITS智能交通中的DSRC技术

DSRC专用短程通信技术是随着IT智能交通的发展和EFC[1]电子(自动)收费应用的要求而提出发展起来的,本文主要介绍DSRC技术和其在EFC 领域的应用.     

DSRC协议分析

专用短距离通信(DSRC)技术是智能交通系统(ITS)中的一个核心技术,应用非常广泛,但目前国际上还没有形成统一的标准。分析了DSRC协议的结构,协议各组成部分的主要功能,列出了DSRC协议的六类控制信息,并阐述了DSRC链路建立的三个阶段。     

智能交通ITS系统中DSRC通信技术的应用

DSRC技术可以把车和路统一成一个有机的整体,给智能交通系统提供具有综合性的智能通信平台。本文主要对DSRC技术的系统结构和原理以及其在ITS中的应用进行了分析。     

专用短程通信在智能交通系统中的应用

本文阐述了智能交通系统（ITS）与不停车电子收费系统（ETC）的概念，并详细介绍了用于智能交通系统的专用短程通信（DSRC）系统的组成、协议分层以及标准化问题。最后介绍了以红外技术代替传统微波实现DSRC系统的最新发展。     

基于DSRC和CDPD的先进公交系统

本文首先讲述了ITS中的2种通信技术——专用短程通信（DSRC）和蜂窝数字分组数据网（CDPD）的基本概念、工作原理及系统特点等，然后提出了一种基本这2种通信技术的先进公交系统，并对各个子系统的功能结构进行了描述。     

基于 Z85C30的 DSRC 高速数据通信在智能交通中的应用

Z85C30是ZILOG公司推出的多规程串行通信控制器。文中介绍了Z85C30芯片的物理特性、工作方式和时钟选择，给出了它在基于微波通信的DSRC中的应用电路。     

车联网专用短程通信技术

通过对车路通信系统的设计,车载、路侧通信单元的开发,车路通信系统测试平台的搭建及测试,指出车路通信系统是车联网系统的通信链路保障,而基于专用短程通信(DSRC)的车路通信系统可以大幅度降低通信延迟,保障了高速、网络拓扑结构频繁变化的车辆网络质量,为车车、车路间提供更为可靠、稳定、高效的通信服务。     

由国外DSRC标准看国内发展状况

车联网按照规定的数据交互标准和通信协议,实现V2X的数据交互和共享.专用短程通信是一种高效的无线通信技术,它可以实现小范围内数据的实时、准确和可靠的双向传输,将车辆和道路有机地连接.本文介绍了美、欧、日的车载通信标准的发展状况,并进行对比分析,然后从美、欧、日的标准谈国内车联网系统、标准制定以及车联网标准体系的建立,并深入研究分析DSRC的特点,为我国制定车联网系统以及车载通信标准发展战略提供参考依据;最后,展望了车联网行业的发展前景.     

专用短程通信协议描述方法的研究及应用

DSRC协议是为ITS中短距离间通信的系统专门开发的通信协议。通过应用SDL语言对DSRC协议的描述和验证,提出了建立抽象化模型、环境模块化、循环开发等方法,并进行了MAC子层的概要性设计和MAC子层中的transmission模块的过程化设计,重点论述了如何将上述方法应用到实际开发工作中去。     

V2X关键技术应用与发展综述

V2X（Vehicle-to-Everything）通信技术是智能交通和智能汽车的支撑技术之一,但目前仍然面临技术路线不明确、政策发展滞后等问题,尚未得到有效推广。系统阐述了V2X技术的内涵和重要作用,重点解析了专用短程通信（Dedicated Short Range Communication,DSRC）和基于蜂窝网络的车辆对外通信（Cellular-V2X,C-V2X）两类V2X主要技术路线的特点和当前问题,总结了国内外相关政策法规、技术标准和产业化活动的最新进展,在此基础上分析了未来V2X技术发展的关键趋势,从而为国家制定V2X相关政策法规、企业明确技术战略方向提供参考。     

浅析移动通信技术之伪卫星时间同步法

码分多址(CDMA)是一种由数字扩频通信技术发展而成的无线通信技术,其通过码序列相关性来实现多址通信。CDMA技术最初因战争需求进行研发,用于军事抗干扰通信之中,后被美国高通(Qualcomm)公司应用在商用蜂窝移动通信系统,CDMA技术自此快速发展,应用于多个领域场景。介绍的这种伪卫星定位系统时间同步方法便是基于CDMA这种移动通信技术发展而来,此时间同步法使地基伪卫星在不需要昂贵的原子钟做原子时间标准,不需要全球卫星导航系统做时基和不需要任何的差分校正技术的情况下,使地基伪卫星定位设备自主地时间同步到统一系统时基。     

Doppler-resistant column-wise complementary coded CDMA technology for V2V communications

In Vehicle-to-Vehicle (V2V) communications, the relatively large Doppler-spread poses a great thread to the system performance. In this paper, we propose a new physical layer air-link technology, which combines the advantages of CDMA and OFDM technologies. More specifically, we apply the column-wise complementary codes to the original OFDM-based physical layer design, which can effectively mitigate the Doppler effect under high-speed communication scenarios. The superiority of the new architecture is demonstrated by mathematical analysis and extensive computer simulations. The main contribution of this paper is two-fold. First, the presented analysis provides a more deep insight into the key performance bottleneck in the emerging short-range communications (DSRC) technology. Second, the proposed air link architecture can be implemented with a relatively low implementation complexity, which is desirable for practical applications.     

Design of 5.9 ghz dsrc-based vehicular safety communication

The automotive industry is moving aggressively in the direction of advanced active safety. Dedicated short-range communication (DSRC) is a key enabling technology for the next generation of communication-based safety applications. One aspect of vehicular safety communication is the routine broadcast of messages among all equipped vehicles. Therefore, channel congestion control and broadcast performance improvement are of particular concern and need to be addressed in the overall protocol design. Furthermore, the explicit multichannel nature of DSRC necessitates a concurrent multichannel operational scheme for safety and non-safety applications. This article provides an overview of DSRC based vehicular safety communications and proposes a coherent set of protocols to address these requirements     

光时分复用系统

介绍光时分复用（OTDM）超高速光通信系统的构成和基本原理，以及其在国内外的发展状况和趋势。全光时分复用／去复用（MUX／DEMUX）技术作为构成OTDM超高速光通信系统的关键技术，在此作了重点介绍。     

LTE‐DSRC hybrid vehicular communication system using DFT‐spread OFDM in uplink

Technologies are advancing at a rapid rate in the current era. People are advancing with the advancement of technologies, be it in education industry, health industry, and providing luxury. With the advent of autonomous luxury‐in‐motion car that provides in‐car‐entertainment (ICE), vehicular communication is the prerequisite towards achieving this goal. Dedicated short range communication (DSRC) is a matured vehicular communication standard, and Long‐Term Evolution (LTE) is the most competing technologies in the cellular communication. In this paper, we focus on the uplink performance of the LTE‐DSRC hybrid infrastructure. The basic transmission scheme for uplink direction is based on single carrier transmission in the form of discrete Fourier transform (DFT)‐spread Orthogonal Frequency Division Multiplexing (OFDM) with a minimum mean square error (MMSE) receiver at the LTE Evolved Node B (eNodeB) and a DSRC OFDM transmitter. A comprehensive bit error rate (BER) performance simulative study has been made on a color image transmission in uplink hybrid LTE‐DSRC system, and the results obtained are encouraging that the proposed convergence is possible, as it provides a substantial decrease in the BER with a gradual increase in the signal ‐to‐ noise ratio Signal to Noise Ratio (SNR).     

An Improvement Energy Consumption Policy Using Communication Reduction in Wireless Body Sensor Network

Dedicated short-range communications (DSRC) is an important wireless technology for current and future automotive safety and mitigation of traffic jams. In this work, we have designed a Coplanar waveguide microstrip patch antenna with linear, upper and bottom and side slots for application in DSRC. The patch antenna was designed using glass epoxy substrate (FR4). Various parametric analyses such as the current distribution, reflection coefficient, radiation pattern on E- and H-plane as well as the realized gain (dB) were performed. The results were obtained by simulation using high-frequency structure simulator tool. The proposed antenna covers a frequency band of 5.8–5.9 GHz which is highly dedicated to the DSRC wireless communication technology for enhancement of safety of the automotive transport system. The designed antenna shows a good return loss of ??19 dB at 5.9 GHz.The designed antenna shows a promising gain, return loss and radiation pattern for use in DSRC for automotive transport systems.