The Experts below are selected from a list of 11874 Experts worldwide ranked by ideXlab platform
Weidong Xiang - One of the best experts on this subject based on the ideXlab platform.
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pilots aided channel estimation for doubly selective fading channel in Vehicular Environment
International Wireless Internet Conference, 2013Co-Authors: Sunzeng Cai, Haiping Jiang, Hua Qian, Weidong XiangAbstract:In vehicle communications, channel characteristic experiences time and frequency selective fading due to high velocity of vehicle and rapid changes of surrounding scatters. The packet format for IEEE 802.11p standard limits the choice of channel estimation algorithms. Conventional channel estimation algorithms perform the channel estimation based on the long preamble training sequence, then applies the estimated channel response to compensate for the entire packet. These algorithms are not optimal for a doubly selective channel in vehicle communications. In this paper, to overcome the effect of doubly selective channel, we propose a novel pilot insertion scheme that covers all subcarriers in both the time and frequency domains simultaneously. Adaptive channel estimation and equalization algorithms are then developed based on the new system architecture. Simulations show significant improvements comparing to other exiting methods.
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The design of a wireless access for Vehicular Environment (WAVE) prototype for intelligent transportation system (ITS) and Vehicular infrastructure integration (VII)
IEEE Vehicular Technology Conference, 2008Co-Authors: Weidong Xiang, Yue Huang, Somanath MajhiAbstract:Inspired by the overwhelming popularity of nowadays wireless local area networks (wireless LAN, or Wi-Fi), researchers and developers have uncovered their wide application perspectives in a Vehicular Environment. Currently, several prototypes of dedicated short range communications (DSRC) for Vehicular networks have been developed by some companies for both intelligent transportation systems (ITS) and Vehicular infrastructure integration (VII). However, most of the designers simply apply the existing indoor wireless technologies, such as Wi-Fi, into a Vehicular Environment without redesigning them for a Vehicular Environment. The vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) channels feature with doubly selective fading due to the high mobility of vehicles. Both theoretical analysis and experiments have verified that the indoor wireless technologies are unable to achieve optimized and robust performance when applied to a Vehicular Environment. Industry is calling for new physical and MAC layer protocols for ITS and VII. The IEEE 802.11p workgroup is currently working on standardizing the wireless access for Vehicular Environment (WAVE), which is anticipated to be ratified in 2009. In this paper, we brief the design of a WAVE prototype based on the IEEE 802.11p protocol, which allows us to implement and evaluate the performance of the IEEE 802.11p standard in a practical approach.
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VTC Fall - The Design of a Wireless Access for Vehicular Environment (WAVE) Prototype for Intelligent Transportation System (ITS) and Vehicular Infrastructure Integration (VII)
2008 IEEE 68th Vehicular Technology Conference, 2008Co-Authors: Weidong Xiang, Yue Huang, Sudhan MajhiAbstract:Inspired by the overwhelming popularity of nowadays wireless local area networks (wireless LAN, or Wi-Fi), researchers and developers have uncovered their wide application perspectives in a Vehicular Environment. Currently, several prototypes of dedicated short range communications (DSRC) for Vehicular networks have been developed by some companies for both intelligent transportation systems (ITS) and Vehicular infrastructure integration (VII). However, most of the designers simply apply the existing indoor wireless technologies, such as Wi-Fi, into a Vehicular Environment without redesigning them for a Vehicular Environment. The vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) channels feature with doubly selective fading due to the high mobility of vehicles. Both theoretical analysis and experiments have verified that the indoor wireless technologies are unable to achieve optimized and robust performance when applied to a Vehicular Environment. Industry is calling for new physical and MAC layer protocols for ITS and VII. The IEEE 802.11p workgroup is currently working on standardizing the wireless access for Vehicular Environment (WAVE), which is anticipated to be ratified in 2009. In this paper, we brief the design of a WAVE prototype based on the IEEE 802.11p protocol, which allows us to implement and evaluate the performance of the IEEE 802.11p standard in a practical approach.
Sudhan Majhi - One of the best experts on this subject based on the ideXlab platform.
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VTC Fall - The Design of a Wireless Access for Vehicular Environment (WAVE) Prototype for Intelligent Transportation System (ITS) and Vehicular Infrastructure Integration (VII)
2008 IEEE 68th Vehicular Technology Conference, 2008Co-Authors: Weidong Xiang, Yue Huang, Sudhan MajhiAbstract:Inspired by the overwhelming popularity of nowadays wireless local area networks (wireless LAN, or Wi-Fi), researchers and developers have uncovered their wide application perspectives in a Vehicular Environment. Currently, several prototypes of dedicated short range communications (DSRC) for Vehicular networks have been developed by some companies for both intelligent transportation systems (ITS) and Vehicular infrastructure integration (VII). However, most of the designers simply apply the existing indoor wireless technologies, such as Wi-Fi, into a Vehicular Environment without redesigning them for a Vehicular Environment. The vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) channels feature with doubly selective fading due to the high mobility of vehicles. Both theoretical analysis and experiments have verified that the indoor wireless technologies are unable to achieve optimized and robust performance when applied to a Vehicular Environment. Industry is calling for new physical and MAC layer protocols for ITS and VII. The IEEE 802.11p workgroup is currently working on standardizing the wireless access for Vehicular Environment (WAVE), which is anticipated to be ratified in 2009. In this paper, we brief the design of a WAVE prototype based on the IEEE 802.11p protocol, which allows us to implement and evaluate the performance of the IEEE 802.11p standard in a practical approach.
Somanath Majhi - One of the best experts on this subject based on the ideXlab platform.
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The design of a wireless access for Vehicular Environment (WAVE) prototype for intelligent transportation system (ITS) and Vehicular infrastructure integration (VII)
IEEE Vehicular Technology Conference, 2008Co-Authors: Weidong Xiang, Yue Huang, Somanath MajhiAbstract:Inspired by the overwhelming popularity of nowadays wireless local area networks (wireless LAN, or Wi-Fi), researchers and developers have uncovered their wide application perspectives in a Vehicular Environment. Currently, several prototypes of dedicated short range communications (DSRC) for Vehicular networks have been developed by some companies for both intelligent transportation systems (ITS) and Vehicular infrastructure integration (VII). However, most of the designers simply apply the existing indoor wireless technologies, such as Wi-Fi, into a Vehicular Environment without redesigning them for a Vehicular Environment. The vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) channels feature with doubly selective fading due to the high mobility of vehicles. Both theoretical analysis and experiments have verified that the indoor wireless technologies are unable to achieve optimized and robust performance when applied to a Vehicular Environment. Industry is calling for new physical and MAC layer protocols for ITS and VII. The IEEE 802.11p workgroup is currently working on standardizing the wireless access for Vehicular Environment (WAVE), which is anticipated to be ratified in 2009. In this paper, we brief the design of a WAVE prototype based on the IEEE 802.11p protocol, which allows us to implement and evaluate the performance of the IEEE 802.11p standard in a practical approach.
Yue Huang - One of the best experts on this subject based on the ideXlab platform.
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The design of a wireless access for Vehicular Environment (WAVE) prototype for intelligent transportation system (ITS) and Vehicular infrastructure integration (VII)
IEEE Vehicular Technology Conference, 2008Co-Authors: Weidong Xiang, Yue Huang, Somanath MajhiAbstract:Inspired by the overwhelming popularity of nowadays wireless local area networks (wireless LAN, or Wi-Fi), researchers and developers have uncovered their wide application perspectives in a Vehicular Environment. Currently, several prototypes of dedicated short range communications (DSRC) for Vehicular networks have been developed by some companies for both intelligent transportation systems (ITS) and Vehicular infrastructure integration (VII). However, most of the designers simply apply the existing indoor wireless technologies, such as Wi-Fi, into a Vehicular Environment without redesigning them for a Vehicular Environment. The vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) channels feature with doubly selective fading due to the high mobility of vehicles. Both theoretical analysis and experiments have verified that the indoor wireless technologies are unable to achieve optimized and robust performance when applied to a Vehicular Environment. Industry is calling for new physical and MAC layer protocols for ITS and VII. The IEEE 802.11p workgroup is currently working on standardizing the wireless access for Vehicular Environment (WAVE), which is anticipated to be ratified in 2009. In this paper, we brief the design of a WAVE prototype based on the IEEE 802.11p protocol, which allows us to implement and evaluate the performance of the IEEE 802.11p standard in a practical approach.
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VTC Fall - The Design of a Wireless Access for Vehicular Environment (WAVE) Prototype for Intelligent Transportation System (ITS) and Vehicular Infrastructure Integration (VII)
2008 IEEE 68th Vehicular Technology Conference, 2008Co-Authors: Weidong Xiang, Yue Huang, Sudhan MajhiAbstract:Inspired by the overwhelming popularity of nowadays wireless local area networks (wireless LAN, or Wi-Fi), researchers and developers have uncovered their wide application perspectives in a Vehicular Environment. Currently, several prototypes of dedicated short range communications (DSRC) for Vehicular networks have been developed by some companies for both intelligent transportation systems (ITS) and Vehicular infrastructure integration (VII). However, most of the designers simply apply the existing indoor wireless technologies, such as Wi-Fi, into a Vehicular Environment without redesigning them for a Vehicular Environment. The vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) channels feature with doubly selective fading due to the high mobility of vehicles. Both theoretical analysis and experiments have verified that the indoor wireless technologies are unable to achieve optimized and robust performance when applied to a Vehicular Environment. Industry is calling for new physical and MAC layer protocols for ITS and VII. The IEEE 802.11p workgroup is currently working on standardizing the wireless access for Vehicular Environment (WAVE), which is anticipated to be ratified in 2009. In this paper, we brief the design of a WAVE prototype based on the IEEE 802.11p protocol, which allows us to implement and evaluate the performance of the IEEE 802.11p standard in a practical approach.
Jon W Mark - One of the best experts on this subject based on the ideXlab platform.
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Opportunistic WiFi Offloading in Vehicular Environment: A Game-Theory Approach
IEEE Transactions on Intelligent Transportation Systems, 2016Co-Authors: Nan Cheng, Ning Zhang, Xuemin Sherman Shen, Xiang Zhang, Jon W MarkAbstract:In this paper, we study opportunistic traffic offloading in a Vehicular Environment, where the cellular traffic of Vehicular users (VUs) is offloaded through carrier-WiFi networks deployed by the mobile network operator (MNO). By jointly considering users' satisfaction, the offloading performance, and the MNO's revenue, two WiFi offloading mechanisms are proposed: auction game-based offloading (AGO) and congestion game-based offloading (CGO). Moreover, we introduce an approach to predict WiFi offloading potential and access cost and incorporate it in the offloading mechanisms. Specifically, with the AGO mechanism, the MNO employs auctions to sell WiFi access opportunities; VUs decide whether to bid according to their utilities and are capable of using WiFi if the auction is won. With the CGO mechanism, a VU calculates utility considering other VUs' strategies and makes offloading decisions accordingly. We show that the AGO mechanism can maximize social welfare and increase the MNO's revenue, whereas the CGO mechanism can achieve a better performance of average VU utility and fairness. Additionally, both AGO and CGO mechanisms can improve the overall WiFi offloading performance. Through simulations, we demonstrate that both AGO and CGO mechanisms can achieve higher average utility of VUs and lower average service delay and offload much more cellular traffic compared with existing offloading mechanisms.
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opportunistic wifi offloading in Vehicular Environment a queueing analysis
Global Communications Conference, 2014Co-Authors: Nan Cheng, Ning Zhang, Xuemin Sherman Shen, Jon W MarkAbstract:In this paper, we present an analytical framework for offloading cellular traffic by outdoor WiFi network in the Vehicular Environment. Specifically, we consider a generic Vehicular user with Poisson data service arrivals to download/upload data from/to the Internet through the cost-effective WiFi network (want-to) or the cellular network providing full service coverage (have-to). Under this scenario, the WiFi offloading performance, characterized by offloading effectiveness, is analyzed in terms of desired average service delay which is the average time the data services can be deferred for WiFi availability. We establish an explicit relation between offloading effectiveness and average service delay by an M/G/l/K queueing model, and the tradeoff between the two is examined. We validate our analytical framework through simulations based on a VANET simulation tool VANETMobisim and real map data sets. Our analytical framework should be valuable for providing offloading guidelines to both Vehicular users and network operators.
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GLOBECOM - Opportunistic WiFi offloading in Vehicular Environment: A queueing analysis
2014 IEEE Global Communications Conference, 2014Co-Authors: Nan Cheng, Ning Zhang, Xuemin Sherman Shen, Jon W MarkAbstract:In this paper, we present an analytical framework for offloading cellular traffic by outdoor WiFi network in the Vehicular Environment. Specifically, we consider a generic Vehicular user with Poisson data service arrivals to download/upload data from/to the Internet through the cost-effective WiFi network (want-to) or the cellular network providing full service coverage (have-to). Under this scenario, the WiFi offloading performance, characterized by offloading effectiveness, is analyzed in terms of desired average service delay which is the average time the data services can be deferred for WiFi availability. We establish an explicit relation between offloading effectiveness and average service delay by an M/G/l/K queueing model, and the tradeoff between the two is examined. We validate our analytical framework through simulations based on a VANET simulation tool VANETMobisim and real map data sets. Our analytical framework should be valuable for providing offloading guidelines to both Vehicular users and network operators.
