2013 13th International Conference on ITS Telecommunications (ITST)最新文献_第7页

Rapid changing channel estimation and equalisation based on hyperbolic modelling for OFDM systems 基于双曲模型的OFDM系统快速变化信道估计与均衡

2013 13th International Conference on ITS Telecommunications (ITST) Pub Date : 2013-12-19 DOI: 10.1109/ITST.2013.6685573

A. Kalakech, M. Berbineau

{"title":"Rapid changing channel estimation and equalisation based on hyperbolic modelling for OFDM systems","authors":"A. Kalakech, M. Berbineau","doi":"10.1109/ITST.2013.6685573","DOIUrl":"https://doi.org/10.1109/ITST.2013.6685573","url":null,"abstract":"Recently, OFDM systems have been proposed as a solution to solve broadband railway communication problems. Channel estimation and equalisation for OFDM system become challenging when the mobile terminal is moving at high speed as the OFDM subcarriers lose their orthogonality in such situations. In this paper we present a novel channel estimation algorithm based on the hyperbolic modelling of rapidly varying channels. The hyperbolic model is based on the observation of the OFDM frequency domain channel matrix provided by rapid channel simulator, and on mathematical analysis of the off-diagonal elements of the channel matrix. The hyperbolic model can be combined with an FFT interpolation technique and then used to perform an iterative least square estimation of the channel matrix even when sparse pilot distribution is used. Furthermore, a sliding window discrete optimisation procedure is introduced to improve the performance of the suboptimal Linear Minimum Mean Square (LMMSE) channel equalisation technique. Numerical results for a mobile moving at 280 km/h and under the Wide Sense Stationary Uncorrelated Scattering (WSSUS) channel assumption are reported. The provided results prove the efficiency and effectiveness of the suggested algorithms.","PeriodicalId":117087,"journal":{"name":"2013 13th International Conference on ITS Telecommunications (ITST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129850922","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

Estimation performance with 3D vehicle model of novel positioning algorithm in radar network systems 新型定位算法在雷达网络系统中的三维车辆模型估计性能

2013 13th International Conference on ITS Telecommunications (ITST) Pub Date : 2013-12-19 DOI: 10.1109/ITST.2013.6685536

Yusuke Yoshida, Hiroyuki Hatano, T. Nakai, M. Fujii, Yu Watanabe

引用次数: 0

City traffic prediction based on real-time traffic information for Intelligent Transport Systems 基于实时交通信息的智能交通系统城市交通预测

2013 13th International Conference on ITS Telecommunications (ITST) Pub Date : 2013-12-19 DOI: 10.1109/ITST.2013.6685576

Zilu Liang, Y. Wakahara

{"title":"City traffic prediction based on real-time traffic information for Intelligent Transport Systems","authors":"Zilu Liang, Y. Wakahara","doi":"10.1109/ITST.2013.6685576","DOIUrl":"https://doi.org/10.1109/ITST.2013.6685576","url":null,"abstract":"Intelligent Transportation Systems (ITS) have been considered important technologies to mitigate urban traffic congestion. Accurate traffic prediction is one of the critical steps in the operation of an ITS. While techniques for traffic prediction have existed for many years, the research effort has mainly been focused on highway networks. Due to the fundamental difference between the traffic flow pattern on highways and that on city roads, much of the existing models cannot be effectively applied to city traffic prediction. In this paper, we propose two city traffic prediction models using different modeling approaches. Model-1 is based on the traffic flow propagation in the network, while Model-2 is based on the time-varied spare flow capacity on the concerned road link. The proposed models are implemented to predict the traffic volume in Cologne in Germany, and the real data are collected through simulations in the traffic simulator SUMO. The results show that both of the proposed models reduce the prediction error up to 52% and 30% in the best cases compared to the existing Shift Model. In addition, we found that Model-1 is suitable for short prediction interval that is in the same magnitude as the link travel time, while Model-2 demonstrates superiority when the prediction interval is larger than one minute.","PeriodicalId":117087,"journal":{"name":"2013 13th International Conference on ITS Telecommunications (ITST)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133575440","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: 26

Context-aware service composition in cyber physical human system for transportation safety 面向交通安全的网络物理人系统环境感知服务组合

2013 13th International Conference on ITS Telecommunications (ITST) Pub Date : 2013-12-19 DOI: 10.1109/ITST.2013.6685535

A. Smirnov, A. Kashevnik, N. Shilov, Aziz Makklya, O. Gusikhin

引用次数: 14

Fuel consumption estimate based on meso traffic characteristics and typical road environment 基于中观交通特征和典型道路环境的油耗估算

2013 13th International Conference on ITS Telecommunications (ITST) Pub Date : 2013-12-19 DOI: 10.1109/ITST.2013.6685540

Xiaohua Zhou, Jian Huang, Ren Jing, Dapeng Li

引用次数: 2

Making channel hopping sequences for self-organized mobile networks 自组织移动网络的信道跳频序列制作

2013 13th International Conference on ITS Telecommunications (ITST) Pub Date : 2013-12-19 DOI: 10.1109/ITST.2013.6685586

Widist Bekulu Tessema, Keuchul Cho, Gihyuk Seong, Gisu Park, K. Han

引用次数: 0

Multi-channel operation and GNSS correction issues 多通道操作和GNSS校正问题

2013 13th International Conference on ITS Telecommunications (ITST) Pub Date : 2013-12-19 DOI: 10.1109/ITST.2013.6685590

Yavuz Peksen, Cagdas Yaman, T. Acarman, A. Peker

{"title":"Multi-channel operation and GNSS correction issues","authors":"Yavuz Peksen, Cagdas Yaman, T. Acarman, A. Peker","doi":"10.1109/ITST.2013.6685590","DOIUrl":"https://doi.org/10.1109/ITST.2013.6685590","url":null,"abstract":"Vehicle-to-vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communication is a promising solution to enhance active safety and to disseminate infotainment messages in the dynamically changing vehicular network. V2V and V2I communication requires fast, reliable and lossless data transmission for a large set of services. To improve bandwidth usage and avoid packet collisions, dual radio solution or channel switching scheme to separate control and service messages in a single radio approach is introduced by European and American technologies, respectively. This study presents realistic modeling of V2V communication and compares the performance metrics of channel switching and dual radio scheme. The impact of GNSS clock corrections to attenuate the drift of a clock from its nominal frequency and channel degradation due to time misalignment is presented via different scenarios. Simulation scenario of highway and intersection is implemented in the vehicular network simulator (ns-3) and mobility (SUMO) simulator platforms. As a proof-of-concept, the effectiveness of using GNSS corrections to attenuate the individual clock drift of the low cost On-board Units (OBUs) of the vehicular nodes is demonstrated.","PeriodicalId":117087,"journal":{"name":"2013 13th International Conference on ITS Telecommunications (ITST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129392788","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

Using hybrid AOA/TOA information for distributed topology control in VANETs 基于混合AOA/TOA信息的VANETs分布式拓扑控制

2013 13th International Conference on ITS Telecommunications (ITST) Pub Date : 2013-12-19 DOI: 10.1109/ITST.2013.6685514

Chao Huang, Y. Chiu, Chih-Yu Wen

{"title":"Using hybrid AOA/TOA information for distributed topology control in VANETs","authors":"Chao Huang, Y. Chiu, Chih-Yu Wen","doi":"10.1109/ITST.2013.6685514","DOIUrl":"https://doi.org/10.1109/ITST.2013.6685514","url":null,"abstract":"In a vehicular ad-hoc network (VANET), the network topology may change frequently. Consequently, the key design issue is how to organize nodes effectively such that the topology can be stabilized quickly. In order to balance the load among the nodes and govern the topology change, a group formation scheme using localized criterions is implemented. The proposed distributed topology control method focuses on reducing the rate of group member change and avoiding the unnecessary information exchange. Two phases are sequentially applied to choose the group members of each node using hybrid angle-of-arrival (AOA) and time-of-arrival (TOA) information. The operation of Phase I is based on the concept of the cone-based method, which can exclude a lot of nodes quickly. Afterwards, the proposed time-slot method is further applied to stabilize the network topology. Given the network structure in Phase I, the routing group member is determined by Phase II operation. The proposed scheme is simulated and analyzed to abstract the network behaviors in a number of settings. The experimental results show that the proposed algorithm provides efficient network topology management and achieves high scalability in VANETs.","PeriodicalId":117087,"journal":{"name":"2013 13th International Conference on ITS Telecommunications (ITST)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133199520","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: 3

Map-reduce for calibrating massive bus trajectory data 用于校准大量公交轨迹数据的Map-reduce

2013 13th International Conference on ITS Telecommunications (ITST) Pub Date : 2013-12-02 DOI: 10.1109/CloudCom.2013.27

Dapeng Li, Xiaohua Zhou, Qi Wang, M. Gao

{"title":"Map-reduce for calibrating massive bus trajectory data","authors":"Dapeng Li, Xiaohua Zhou, Qi Wang, M. Gao","doi":"10.1109/CloudCom.2013.27","DOIUrl":"https://doi.org/10.1109/CloudCom.2013.27","url":null,"abstract":"Accurate bus trajectory data is the basis of many public transportation applications. However, trajectory data sampled by GPS devices contains notable direction errors. We cannot determine the travelling direction of the bus through trajectory data. To address this problem, we utilize k-nearest neighbor algorithm (K-NN) to determine the direction of the bus trajectory. Meanwhile, the voluminous bus trajectory data accumulated daily need to be process efficiently for further data mining. To meet the scalability and performance requirements, in this paper, we use Map-Reduce programming model for trajectory data direction correcting and projecting the bus GPS point to the road link. Particularly, we compare execution time through setting different amount of reduce to express the extent of running time can be affected. Experimental results indicate that the K-NN algorithm improves the accuracy of the direction field in raw bus trajectory data significantly. By comparing the efficiency under different reduce quantities. The result shows that parallel processing framework improves the computational efficiency by a factor of 2 at least, obtaining.","PeriodicalId":117087,"journal":{"name":"2013 13th International Conference on ITS Telecommunications (ITST)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125499885","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: 1

A method for driving event detection using SAX on smartphone sensors 一种在智能手机传感器上使用SAX进行驾驶事件检测的方法

2013 13th International Conference on ITS Telecommunications (ITST) Pub Date : 2013-11-01 DOI: 10.1109/ITST.2013.6685587

Pimwadee Chaovalit, Chalermpol Saiprasert, Thunyasit Pholprasit

{"title":"A method for driving event detection using SAX on smartphone sensors","authors":"Pimwadee Chaovalit, Chalermpol Saiprasert, Thunyasit Pholprasit","doi":"10.1109/ITST.2013.6685587","DOIUrl":"https://doi.org/10.1109/ITST.2013.6685587","url":null,"abstract":"Drivers errors such as careless and aggressive driving behaviors are one of the key factors contributing to road traffic accidents. It is, therefore, essential that drivers are aware of their actions when they are in control of the wheel responsible for not only their own lives but also passengers and bystanders on the road. Driver monitoring and advanced driver assistance systems have already been utilized in fleet and logistic domain as well as built into high end vehicles. However, the majority of drivers on the road today do not have access to such systems. This paper proposes a novel methodology of driving events detection using a time series approximation algorithm known as SAX on data collected from smartphone sensors. The use of smartphone allows the system to be easily accessible, widely available and implemented at low cost. Preliminary results from our experiments revealed that the precision of the proposed detection algorithm of aggressive driving events is fairly good as the precision values range from 50% to 66.67%. Further improvements can be made as our future work on the detection rate of the proposed algorithm as the detection rates reported range from 25% to 37.5%.","PeriodicalId":117087,"journal":{"name":"2013 13th International Conference on ITS Telecommunications (ITST)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125098080","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: 21