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Proceedings ArticleDOI

Dedicated short range communications (DSRC) for intelligent transport system

TL;DR: In an effort to develop a complete DSRC system for ITS application, the authors have studied a lot of experimental facts which they are exploiting for the design and a fixed wireless connectivity at Ku band is explored for road side base station to master switching center connectivity.
Abstract: In an effort to develop a complete DSRC system for ITS application, the authors have studied a lot of experimental facts which they are exploiting for the design. The wireless technology has been chosen properly which is capable of tackling the severe interferences present in the open road. For road to car communication, a combined digital technology like spread spectrum along with diversity reception will help a lot in this regard. Accordingly, the choice is for FHSS based space diversity system which will utilize carrier frequency around 5.8 GHz ISM band with available bandwidth of 80 MHz and no license. For efficient design, the radio channel is characterized on which the design is based. To have the full DSRC system, a fixed wireless connectivity at Ku band is also explored for road side base station to master switching center connectivity.
Citations
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Proceedings ArticleDOI
08 Dec 2011
TL;DR: This work proposes a multiple-RSU model, which offers the opportunity to the RSUs suffering from handling high volume workload to transfer some of its delay tolerant requests to other RSUs, which have light workload and located in the direction in which the vehicle is heading.
Abstract: Nowadays, data dissemination using Road Side Units (RSUs) in Vehicular Ad Hoc Networks (VANETs) has received important consideration to assist the inter-vehicle communication for overcoming the vehicle to vehicle frequent disconnection problem. During rush hour, an RSU may be overloaded by many requests submitted by the vehicles. Due to strict realtime and short wireless transmission range coverage constraints, a heavily overloaded RSU may experience high deadline miss rate in effect of serving too many requests beyond its capacity. In this work, we investigate the vehicle submitted requests are generally two types: delay sensitive and delay tolerant. We propose a multiple-RSU model, which offers the opportunity to the RSUs suffering from handling high volume workload to transfer some of its delay tolerant requests to other RSUs, which have light workload and located in the direction in which the vehicle is heading. By a series of simulation experiments, we also support our multiple-RSU based co-operative load transferring model, which extensively outperforms the single independent RSU based VANETs model against a number of performance metrics.

15 citations

Proceedings ArticleDOI
05 Jul 2018
TL;DR: The design and implementation of DSRC based On-Board and Road Side Units as well as the architecture and functional aspects of the DSRC protocol are described along with two vehicular safety applications developed and tested.
Abstract: Dedicated Short Range Communications (DSRC), a wireless standard, is considered to be the most promising protocol to be used for Vehicle to Vehicle (V2V) and Vehicle to Infrastructure (V2I) communications. The DSRC standard is specifically designed for automotive use, focused on vehicular safety applications. Most of the road accidents are accounted due to non-focused drivers and unpredicted roads, which could be reduced to a great extend using DSRC enabled alert systems. This paper describes the design and implementation of DSRC based On-Board and Road Side Units as well as the architecture and functional aspects of the DSRC protocol along with two vehicular safety applications developed and tested.

12 citations


Cites background from "Dedicated short range communication..."

  • ...RSU collects and forwards information to OBU for various ITS based services and facilitates internet access [2]....

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Proceedings ArticleDOI
01 Sep 2019
TL;DR: This thesis analyses and introduces an intelligent fire-fighting systembased on the new industry standard, and a smoke-fire detection and alarm device based on the Internet of Things platform and Nb-IoT technology.
Abstract: NB-IoT refers to a cellular-based narrowband Internet of Things, which has become an important part of the Internet of Things. NB-IoT is a new technology emerging in the field of Internet of Things in recent years. It has obvious advantages in technology and application. In addition, the application of narrowband Internet of Things (NB-IoT) technology in the field of fire protection can fundamentally enhance the combat capability of fire fighting forces, avoid fire and reduce the loss of life and property of the people. This thesis analyses and introduces an intelligent fire-fighting system based on the new industry standard, and a smoke-fire detection and alarm device based on the Internet of Things (IoT) platform and Nb-IoT technology. It also puts forward corresponding solutions to the problem of smart smoke, such as the value, advantages and future expectations of the solution.

11 citations


Cites background from "Dedicated short range communication..."

  • ...However, in the case of non-fire, there is also a great probability that the above signals will be generated [3], and even the law of their changes is very similar to the characteristics of fire occurrence, which also has a great probability of causing the detector to give false alarm....

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01 Jan 2009
TL;DR: This paper has resorted to the widely available GPS/GPRS tracking technology, heavily used by trucking companies, in order to obtain more than 30 million GPS points to construct the road map of an interesting city of Portugal, called Arganil, in an accurate, inexpensive and permanently up-to-date manner.
Abstract: The car manufacturing industry has been conducting a considerable effort to allow future vehicles to communicate, either between them or with a road infrastructure, in order to improve driving safety. As the position of each vehicle is an essential attribute of the proposed application protocols (to avoid collisions at blind intersections, for instance), and is also fundamental to support complex network protocols based on mobile wireless nodes with very limited transmission range, such communicating vehicles will be further equipped with GPS receivers. This massive distribution of GPS sensors, in conjunction with a free of charge communication infrastructure that allows accessing the information collected by such devices, will create a powerful new medium of remote sensing of geographical information. In this paper we address the automatic road network extraction based on this vehicular sensing infrastructure where the sensor in play is just the GPS receiver. We have resorted to the widely available GPS/GPRS tracking technology, heavily used by trucking companies, in order to obtain more than 30 million GPS points to construct the road map of an interesting city of Portugal, called Arganil, in an accurate, inexpensive and permanently up-to-date manner. Our algorithm is implemented using spatial SQL queries to aggregate data from multiple traces to produce a weighted-mean geometry of road axles, diluting GPS errors. In order to evaluate our extracted road network, we have compared its geometric and topological layers with a vectorial road map extracted from high resolution satellite images. Results show a highly accurate correspondence between them in all areas where a sufficient number of GPS traces have been collected.

11 citations

Journal ArticleDOI
TL;DR: BECSI is proposed, a Bandwidth Efficient Certificate Status Information mechanism to efficiently distribute certificate status information CSI in VANETs by means of Merkle hash trees MHT, which allows to retrieve authenticated CSI not only from the infrastructure but also from vehicles acting as mobile repositories.
Abstract: Certificate revocation is a challenging task, especially in mobile network environments such as vehicular ad Hoc networks VANETs. According to the IEEE 1609.2 security standard for VANETs, public key infrastructure PKI will provide this functionality by means of certificate revocation lists CRLs. When a certificate authority CA needs to revoke a certificate, it globally distributes CRLs. Transmitting these lists pose a problem as they require high update frequencies and a lot of bandwidth. In this article, we propose BECSI, a Bandwidth Efficient Certificate Status Information mechanism to efficiently distribute certificate status information CSI in VANETs. By means of Merkle hash trees MHT, BECSI allows to retrieve authenticated CSI not only from the infrastructure but also from vehicles acting as mobile repositories. Since these MHTs are significantly smaller than the CRLs, BECSI reduces the load on the CSI repositories and improves the response time for the vehicles. Additionally, BECSI improves the freshness of the CSI by combining the use of delta-CRLs with MHTs. Thus, vehicles that have cached the most current CRL can download delta-CRLs to have a complete list of revoked certificates. Once a vehicle has the whole list of revoked certificates, it can act as mobile repository.

9 citations


Cites background from "Dedicated short range communication..."

  • ...Multi-hop communication facilitates information exchange among network nodes that are not in direct communication range [3,14], by means of short range wireless technology based on IEEE 802....

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References
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Reference BookDOI
21 Sep 2000
TL;DR: In this article, the authors describe the UltraWideband (UWB) Radars and differences from Common Narrowband Radars, including the compression of wideband returns from Overspread Targets.
Abstract: Preface Main Features of Ultra-Wideband (UWB) Radars and Differences from Common Narrowband Radars, Igor I. Immoreev Improved Signal Detection in UWB Radars, Igor I. Immoreev High-Resolution Ultra-Wideband Radars, Nasser J. Mohamed Ultra-Wideband Radar Receivers, James D. Taylor Compression of Wideband Returns from Overspread Targets, Benjamin C. Flores and Roberto Vasquez, Jr. The Micropower Impulse Radar, James D. Taylor and Thomas E. McEwan Ultra-Wideband Technology for Intelligent Transportation Systems, Robert B. James and Jeffrey B. Mendola Design, Performance, and Applications of a Coherent Ultra-Wideband Random Noise Radar, Ram M. Narayanan, Yi Xu, Paul D. Haffmeyer, and John O. Curtis New Power Semiconductor Devices for Generation of Nano- and Subnanosecond Pulses, Alexei F. Kardo-Sysoev Fourier Series Based Waveform Generation and Signal Processing in Ultra-Wideband Radar, Gurnam S. Gill High Resolution Step-Frequency Radar, Gurnam S. Gill The CARABAS II VHF Synthetic Aperature Radar, Lars Ulander, Hans Hellsten, and James D. Taylor Ultra-Wideband Radar Capability Demonstrations, James D. Taylor Bistatic Radar Polarimetry Theory, Anne-Laure Germond, Eric Pottier, and Joseph Saillard

422 citations

Proceedings ArticleDOI
Allen Salmasi1, K.S. Gilhousen1
19 May 1991
TL;DR: A breadboard CDMA digital cellular system was developed by QUALCOMM and demonstrated in San Diego in November 1989 and in February 1990, an extensive technical field trial was carried out in midtown Manhattan with NYNEX Mobile.
Abstract: A breadboard CDMA digital cellular system was developed by QUALCOMM and demonstrated in San Diego in November 1989. In February 1990, an extensive technical field trial was carried out in midtown Manhattan with NYNEX Mobile. For the purposes of carrying out the CDMA trials and demonstrations, a total of three cell-site and two mobile prototype units were built. In each case, the demonstration system utilized two actual cell sites and one mobile and included A/B comparisons with the commercial analog system. The fundamental features of CDMA, such as power control and soft handoff, were tested and proven in a variety of field conditions. The authors describe the CDMA signal and waveform design, the CDMA system design, CDMA power control, and additional features of CDMA. >

372 citations


"Dedicated short range communication..." refers background in this paper

  • ...W-CDMA, CDMA2000, MC-CDMA and MIMO CDMA [3],[4] are the different versions of same technology....

    [...]

Journal ArticleDOI
J. Bartram1
TL;DR: This book discusses DIGITAL COMMUNICATION SYSTEMS, the philosophy and design of which are at the heart of the modern digital communications system, and its applications, as well as other topics.
Abstract: DIGITAL COMMUNICATION ADVANTAGES AND DISADVANTAGES TOTALECER. INTRODUCTION TO DIGITAL COMMUNICATIONS DIGITAL. INTRODUCTION TO EECS II DIGITAL COMMUNICATION SYSTEMS. PRINCIPLES OF DIGITAL COMMUNICATION SHARIF UNIVERSITY OF. SIMON S HAYKIN DIGITAL COMMUNICATION SYSTEMS WILEY 2013. DIGITAL COMMUNICATION SYSTEMS. DIGITAL COMMUNICATION SYSTEMS NPTEL. DIGITAL COMMUNICATION SYSTEM MODULATION BANDWIDTH. DIGITAL COMMUNICATION SYSTEMS FREE EBOOKS DOWNLOAD. COMMUNICATION SYSTEMS ANALOG VS DIGITAL WIKIBOOKS OPEN. DIGITAL COMMUNICATION SYSTEMS WILEY COM. COMMUNICATION SYSTEMS II. DIGITAL COMMUNICATION DEFINITION OF DIGITAL. MODERN DIGITAL AND ANALOG COMMUNICATION THE AMAZON COM. DIGITAL COMMUNICATION SYSTEMS MCQ SERIES. DIGITAL COMMUNICATIONS FUNDAMENTALS AND APPLICATIONS. DIGITAL COMMUNICATION SYSTEMS 1ST EDITION AMAZON COM. DIGITAL COMMUNICATIONS SYSTEMS MASTER’S DEGREE. DIGITAL COMMUNICATION SYSTEM SLIDESHARE. DIGITAL COMMUNICATION SYSTEMS GOOGLE BOOKS. ANALOG AND DIGITAL COMMUNICATION SYSTEMS BY MARTIN S RODEN. WILEY DIGITAL COMMUNICATION SYSTEMS 1ST EDITION SIMON. DIGITAL COMMUNICATION SYSTEM MANAGEMENT STUDY GUIDE. DIGITAL MODULATION IN COMMUNICATIONS SYSTEMS – AN INTRODUCTION. DATA TRANSMISSION WIKIPEDIA. DIGITAL COMMUNICATION SYSTEMS EBOOK BY SIMON HAYKIN. DESIGN OF A DIGITAL COMMUNICATION SYSTEM SIGNAL PROCESSING. DIGITAL COMMUNICATIONS J S CHITODE GOOGLE BOOKS. INTRODUCTIONTOCOMMUNICATIONSYSTEMS UC SANTA BARBARA. INTRODUCTION TO DIGITAL COMMUNICATION MIT OPENCOURSEWARE. INTRODUCTION TO DIGITAL COMMUNICATIONS SYSTEM. DCSL DIGITAL COMMUNICATION SYSTEMS LIMITED. TYPES OF DIGITAL COMMUNICATION TECHWALLA COM. TELECOMMUNICATION WIKIPEDIA. DIGITAL COMMUNICATION SYSTEMS UNIVERSITY OF OTTAWA. DIGITAL COMMUNICATION BY SIMON HAYKIN PDF 4ED TOTALECER. FUNDAMENTALS OF DIGITAL COMMUNICATIONS SYSTEMS 1 1. COMMUNICATION SYSTEMS ADVANTAGES OF DIGITAL TRANSMISSION. 3 INTRODUCTION TO DIGITAL COMMUNICATION SYSTEMS YOUTUBE. DIGITAL COMMUNICATION SYSTEMS SLIDESHARE. THEORY AND DESIGN OF DIGITAL COMMUNICATION SYSTEMS. ELEMENTS OF A DIGITAL COMMUNICATION SYSTEM. DIGITAL COMMUNICATION SYSTEMS UOTECHNOLOGY EDU IQ. ELEMENTS OF DIGITAL COMMUNICATION SYSTEMS. DIGITAL AND ANALOG COMMUNICATION SYSTEMS. DIGITAL AMP ANALOG COMMUNICATION SYSTEMS 8TH EDITION PDF. DIGITAL COMMUNICATION SYSTEM QUESTIONS AND ANSWERS. DIGITAL COMMUNICATIONS TRAINING SYSTEMS LAB VOLT. DIGITAL COMMUNICATION TUTORIAL. EE2EE2 4 COMMUNICATION SYSTEMS4 COMMUNICATION SYSTEMS

82 citations

Proceedings ArticleDOI
19 Sep 2004
TL;DR: In this article, a prototype of the ultrawideband (UWB) radar has been developed by Russian UWB group researchers at the Moscow Aviation Institute at "analog and digital radio systems" department (www.uwbgroup.ru).
Abstract: Here, we present a description of a block scheme, characteristics, specific features of design and results of testing for a prototype of the ultrawideband (UWB) radar, which has been developed by Russian UWB group researchers at Moscow Aviation Institute at "analog and digital radio systems" department (www.uwbgroup.ru). The prototype was designed within a research work, which we are conducting on the state order from one of Russian federation state institutions. The UWB radar is intended for detection of moving targets at a distance of several kilometers. The radar design is divided into two stages. In the first stage, we have produced a radar prototype, which incorporates a low power narrow-pulse generator (NPG). During laboratory test, the prototype has afforded the detection of moving targets at the distance of up to one hundred meters. Thereby, the validity of technical solutions used for the whole radar's and radar unit's design was confirmed. In the second stage, we plan to conduct field tests of the radar prototype equipped with a high power NPG.

40 citations


"Dedicated short range communication..." refers background in this paper

  • ...DSRC is different from other mobile communications systems, and has the feature that, within a limited area, it can transmit large volumes of data accurately and reliably [2]....

    [...]