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International Journal of Vehicular Technology最新文献

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A Novel Fairness-Aware Resource Allocation Scheme in Multiuser SISO-OFDMA Downlink 一种新的多用户sso - ofdma下行链路公平感知资源分配方案
International Journal of Vehicular Technology Pub Date : 2010-08-30 DOI: 10.1155/2010/432762
Vasileios D. Papoutsis, I. Fraimis, S. Kotsopoulos
{"title":"A Novel Fairness-Aware Resource Allocation Scheme in Multiuser SISO-OFDMA Downlink","authors":"Vasileios D. Papoutsis, I. Fraimis, S. Kotsopoulos","doi":"10.1155/2010/432762","DOIUrl":"https://doi.org/10.1155/2010/432762","url":null,"abstract":"The problem of resource allocation for the downlink of wireless systems operating over a frequency-selective channel is investigated. It is assumed that both the Base Station (BS) and each user are equipped with a single antenna (Single Input Single Output-SISO case), and Orthogonal Frequency Division Multiple Access (OFDMA) is used as a multiple access scheme. The aim is to maximize the sum of the users' data rates subject to constraints on total available power and proportional fairness among users' data rates. Achieving the optimal solution has a high computational cost thereby the use of suboptimal techniques is necessary. A suboptimal, but efficient, scheme is devised, and it is shown, via simulation, that not only the proposed resource allocation scheme achieve higher sum of the users' data rates than other existing schemes but also the sum data rate is distributed fairly and flexibly among users. In addition, the proposed scheme is complexity effective and can be applied to latest-generation wireless systems that provide Quality-of-Service (QoS) guarantees.","PeriodicalId":269774,"journal":{"name":"International Journal of Vehicular Technology","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124111131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Aspect of Dynamic Simulation and Experimental Research Studies on Hybrid Pneumatic Power System 混合动力气动动力系统动态仿真与实验研究
International Journal of Vehicular Technology Pub Date : 2010-06-23 DOI: 10.1155/2010/893197
K. D. Huang, H. Nguyễn
{"title":"Aspect of Dynamic Simulation and Experimental Research Studies on Hybrid Pneumatic Power System","authors":"K. D. Huang, H. Nguyễn","doi":"10.1155/2010/893197","DOIUrl":"https://doi.org/10.1155/2010/893197","url":null,"abstract":"A Hybrid Pneumatic Power System (HPPS) has been developed for several years with the major aim of reducing the vehicle fuel consumption, environment pollution and enhancing the vehicle performance as well. Comparing with the conventional hybrid system, HPPS replaces the battery's electrochemical energy with a high-pressure air storage tank and enables the internal combustion engine (ICE) to function at its sweet spot. Besides, the HPPS, which effectively merges both the high-pressure air flow from the storage tank and the recycled exhaust flow from the ICE, thereby increases the thermal efficiency of the ICE and transforms the merged flow energy into mechanical energy using a high-efficiency turbine. This paper focuses on the major research process into HPPSs, including overall dynamic simulation and experimental validation. By using the simulation tool ITI-Sim, this research demonstrates an experiment which can be operated precisely according to the requirements of various driving conditions under which a car actually runs on the road in accordance with the regulated running vehicle test mode. HPPS is expected to increase the performance of the entire system from 15% to 39%, and is likely to replace the traditional system in the coming years.","PeriodicalId":269774,"journal":{"name":"International Journal of Vehicular Technology","volume":"173 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123925098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Managing DSRC and WAVE Standards Operations in a V2V Scenario 在V2V场景中管理DSRC和WAVE标准操作
International Journal of Vehicular Technology Pub Date : 2010-06-20 DOI: 10.1155/2010/797405
Y. Morgan
{"title":"Managing DSRC and WAVE Standards Operations in a V2V Scenario","authors":"Y. Morgan","doi":"10.1155/2010/797405","DOIUrl":"https://doi.org/10.1155/2010/797405","url":null,"abstract":"The Dedicated Short-Range Communications (DSRC) standards suite is based on multiple cooperating standards mainly developed by the IEEE. In particular, we focus this paper on the core design aspects of DSRC which is called Wireless Access in Vehicular Environment (WAVE). WAVE is highlighted in IEEE 1609.1/.2/.3/.4. The DSRC and WAVE standards have been the center of major attention in both research and industrial communities. In 2008, WAVE standard was the third best seller standards in the history of the IEEE. This attention reflects the potential of WAVE to facilitate much of the vehicular safety applications. In this paper we present a fairly detailed tutorial of the WAVE standards. We extend the paper by describing some of the lessons learned from particular design approaches. We direct the reader to the landmark research papers in relevant topics. We alert the reader about major open research issues that might lead to future contribution to the WAVE design.","PeriodicalId":269774,"journal":{"name":"International Journal of Vehicular Technology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133528881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 14
Suboptimal Rate Adaptive Resource Allocation for Downlink OFDMA Systems 下行OFDMA系统的次优速率自适应资源分配
International Journal of Vehicular Technology Pub Date : 2009-08-18 DOI: 10.1155/2009/891367
Sanam Sadr, A. Anpalagan, K. Raahemifar
{"title":"Suboptimal Rate Adaptive Resource Allocation for Downlink OFDMA Systems","authors":"Sanam Sadr, A. Anpalagan, K. Raahemifar","doi":"10.1155/2009/891367","DOIUrl":"https://doi.org/10.1155/2009/891367","url":null,"abstract":"This paper aims to study the performance of low complexity adaptive resource allocation in the downlink of OFDMA systems with fixed or variable rate requirements (with fairness consideration). Two suboptimal resource allocation algorithms are proposed using the simplifying assumption of transmit power over the entire bandwidth. The objective of the \u0000first algorithm is to maximize the total throughput while \u0000maintaining rate proportionality among the users. The proposed \u0000suboptimal algorithm prioritizes the user with the highest \u0000sensitivity to the subcarrier allocation, and the variance over the \u0000subchannel gains is used to define the sensitivity of each user. \u0000The second algorithm concerns rate adaptive resource allocation in \u0000multiuser systems with fixed rate constraints. We propose a \u0000suboptimal joint subchannel and power allocation algorithm which \u0000prioritizes the users with the highest required data rates. The main \u0000feature of this algorithm is its low complexity while achieving \u0000the rate requirements.","PeriodicalId":269774,"journal":{"name":"International Journal of Vehicular Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129778188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 32
Priority-Based Inter-Vehicle Communication for Highway Safety Messaging Using IEEE 802.11e 基于ieee802.11 e的基于优先级的公路安全消息传输的车辆间通信
International Journal of Vehicular Technology Pub Date : 2009-07-12 DOI: 10.1155/2009/423141
Chakkaphong Suthaputchakun
{"title":"Priority-Based Inter-Vehicle Communication for Highway Safety Messaging Using IEEE 802.11e","authors":"Chakkaphong Suthaputchakun","doi":"10.1155/2009/423141","DOIUrl":"https://doi.org/10.1155/2009/423141","url":null,"abstract":"We propose to use IEEE 802.11e in conjunction with retransmission mechanisms for priority-based Intervehicle Communication (IVC) for highway safety messaging in both vehicular infrastructure and ad hoc networks. Each IVC message, which is assigned a priority based on the safety event urgency, requires different quality of service in terms of communication reliability and average delay. To increase the communication reliability in a broadcast-based IVC, we apply retransmission mechanisms that can provide proportional reliability differentiation for each prioritized message. We evaluate the performance of our proposed protocol using OPNET Modeler, in terms of percentage of successful transmissions and average delay. The protocol performance is evaluated for (1) different system parameters such as the packet size, number of vehicles, and percentage of priority 1 vehicles, and (2) priority-based protocol parameters, such as contention window, interframe spacing and retransmission parameters. The results show that proper protocol parameter settings per priority message result in an efficient solution for priority based broadcast IVC. Moreover, the proposed protocol is fully compatible with both IEEE 802.11 and IEEE 802.11e standards.","PeriodicalId":269774,"journal":{"name":"International Journal of Vehicular Technology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131219253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Evaluation of Physical Carrier Sense Based Backbone Maintenance in Mobile Ad Hoc Networks 基于物理载波感知的移动自组网骨干网维护评估
International Journal of Vehicular Technology Pub Date : 2009-07-05 DOI: 10.1155/2009/958056
Sapna Deval, L. Ritchie, M. Reisslein, A. Richa
{"title":"Evaluation of Physical Carrier Sense Based Backbone Maintenance in Mobile Ad Hoc Networks","authors":"Sapna Deval, L. Ritchie, M. Reisslein, A. Richa","doi":"10.1155/2009/958056","DOIUrl":"https://doi.org/10.1155/2009/958056","url":null,"abstract":"Physical carrier sensing has to date mainly been exploited for improving medium access control in wireless networks. Recently, a parallel algorithm striving to extensively exploit physical carrier sensing \u0000for constructing and maintaining a connected dominating set (CDS), which is also known as spanner, \u0000backbone, or overlay network in wireless ad hoc networks with interference ranges larger than transmission \u0000ranges has been proposed. Existing evaluations of this algorithm are limited to theoretical asymptotic \u0000bounds and simulations of static networks. In this paper, we evaluate the physical carrier sensing-based \u0000CDS maintenance for mobile ad hoc networks through discrete event simulations. For a wide range of \u0000node speeds and node densities, we evaluate the CDS characteristics and message exchanges required for \u0000maintaining the CDS. We find that the algorithm maintains a stable leader set dominating all nodes in the \u0000network for a wide range of mobility levels but struggles to maintain connectivity at high mobility levels. \u0000We also quantify the portions of the control messages for CDS maintenance that are exchanged through \u0000physical carrier sensing. We find that the parallel algorithm manages to greatly reduce the reliance on \u0000intact message receptions.","PeriodicalId":269774,"journal":{"name":"International Journal of Vehicular Technology","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126209529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
The Effect of Different Injection Strategies and Intake Conditions on the Emissions Characteristics in a Diesel Engine 不同喷射策略和进气条件对柴油机排放特性的影响
International Journal of Vehicular Technology Pub Date : 2009-06-02 DOI: 10.1155/2009/105363
M. Gorji-Bandpy, S. Soleimani, D. Ganji
{"title":"The Effect of Different Injection Strategies and Intake Conditions on the Emissions Characteristics in a Diesel Engine","authors":"M. Gorji-Bandpy, S. Soleimani, D. Ganji","doi":"10.1155/2009/105363","DOIUrl":"https://doi.org/10.1155/2009/105363","url":null,"abstract":"Choosing various injection strategies and intake conditions are potentially effective techniques to reduce exhaust emission from diesel engines. The purpose of this study is to investigate the effect of different spray incoming angles, different spray cone angles, different injection timing, and different intake temperatures together with emission characteristics on a heavy duty diesel engine via three dimensional computational fluid dynamics (CFD) procedures. Furthermore the effect of multiple injector combustion chamber and its benefits in pollutant reduction is studied. The principal results show the significant differences in soot and 𝑁𝑂 generation during combustion between above different strategies.","PeriodicalId":269774,"journal":{"name":"International Journal of Vehicular Technology","volume":"761 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122993938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
Bifocal Stereoscopic Vision for Intelligent Vehicles 智能车辆双焦点立体视觉
International Journal of Vehicular Technology Pub Date : 2009-03-29 DOI: 10.1155/2009/123231
F. Rovira-Más, Qi Wang, Qin Zhang
{"title":"Bifocal Stereoscopic Vision for Intelligent Vehicles","authors":"F. Rovira-Más, Qi Wang, Qin Zhang","doi":"10.1155/2009/123231","DOIUrl":"https://doi.org/10.1155/2009/123231","url":null,"abstract":"The numerous benefits of real-time 3D awareness for autonomous vehicles have motivated the incorporation of stereo cameras to the perception units of intelligent vehicles. The availability of the distance between camera and objects is essential for such applications as automatic guidance and safeguarding; however, a poor estimation of the position of the objects in front of the vehicle can result in dangerous actions. There is an emphasis, therefore, in the design of perception engines that can make available a rich and reliable interval of ranges in front of the camera. The objective of this research is to develop a stereo head that is capable of capturing 3D information from two cameras simultaneously, sensing different, but complementary, fields of view. In order to do so, the concept of bifocal perception was defined and physically materialized in an experimental bifocal stereo camera. The assembled system was validated through field tests, and results showed that each stereo pair of the head excelled at a singular range interval. The fusion of both intervals led to a more faithful representation of reality.","PeriodicalId":269774,"journal":{"name":"International Journal of Vehicular Technology","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127774535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 9
Performance Analysis of CDMA WLL Systems with Imperfect Power Control and Imperfect Sectorization 不完全功率控制和不完全分割的CDMA WLL系统性能分析
International Journal of Vehicular Technology Pub Date : 2008-09-30 DOI: 10.1155/2008/413821
S. El-Dolil
{"title":"Performance Analysis of CDMA WLL Systems with Imperfect Power Control and Imperfect Sectorization","authors":"S. El-Dolil","doi":"10.1155/2008/413821","DOIUrl":"https://doi.org/10.1155/2008/413821","url":null,"abstract":"Wireless local loop (WLL) provides reliable, flexible, and economical access to the local telephone service using radio technology in the place of traditional wireline. In this paper, an analytical model is derived to evaluate the effect of both imperfect power control and imperfect sectorization on the performance of code division multiple access (CDMA) WLL systems. The results show that the capacity degradation, due to imperfect power control, is about 25.8% and 11.5% for single cell and multiple cell systems, respectively. Increasing the overlapping angle from \u0000 0∘ to 5∘ \u0000 causes the capacity gain to decrease from 6 to 5.53, while the corresponding sectorization efficiency drops from 100% to 92.3%.","PeriodicalId":269774,"journal":{"name":"International Journal of Vehicular Technology","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132787877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Routing in Vehicular Networks: Feasibility, Modeling, and Security 车联网中的路由:可行性、建模和安全性
International Journal of Vehicular Technology Pub Date : 2008-04-21 DOI: 10.1155/2008/267513
Ioannis Broustis, M. Faloutsos
{"title":"Routing in Vehicular Networks: Feasibility, Modeling, and Security","authors":"Ioannis Broustis, M. Faloutsos","doi":"10.1155/2008/267513","DOIUrl":"https://doi.org/10.1155/2008/267513","url":null,"abstract":"Vehicular networks are sets of surface transportation systems that have the ability to communicate with each other. There are several possible network architectures to organize their in-vehicle computing systems. Potential schemes may include vehicle-to-vehicle ad hoc networks, wired backbone with wireless last hops, or hybrid architectures using vehicle-to-vehicle communications to augment roadside communication infrastructures. Some special properties of \u0000these networks, such as high mobility, network partitioning, and constrained topology, differentiate them from other types of wireless networks. We provide an in-depth discussion on the important studies related to architectural design and routing for such networks. Moreover, we discuss the major security concerns appearing in vehicular networks.","PeriodicalId":269774,"journal":{"name":"International Journal of Vehicular Technology","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133446094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 50
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