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2012 12th International Conference on ITS Telecommunications最新文献

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An optical CDMA method for in-vehicle information service 一种车载信息服务的光CDMA方法
Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425195
Chih-Ta Yen, Wen-Bin Chen
This study proposes a new inter-vehicle communication (IVC) system based on optical spectral-amplitude-coding optical code division multiple access (SACOCDMA) systems architecture, then, analysis and calculate the system's performance by using analytic and simulation methods. The important feature of the SAC-OCDMA systems is that multiple access interference (MAI) can be eliminated by code sequences of a fixed in-phase cross-correlation value with balance detection schemes. The advantage of optical CDMA multiplexed method compared with electrical multiplexed method is no electromagnetic interference and security enhanced. The performance of modify prime codes (MPCs) and Walsh-Hadamard codes as signature codes for the SAC-OCDMA systems is analyzed. The simulation results of MPCs in SAC-OCDMA system structures are first presented by commercial simulation obtained using OptiSystem software. The simulation results show that the bit error rate (BER) through use of the MPCs is superior to the conventional Walsh-Hadamard codes, especially when the received effect power is large. The eye diagram also shows that the SAC-OCDMA system with MPCs exhibits a wider opening than the Walsh-Hadamard codes.
提出了一种基于光谱-幅度编码光码分多址(SACOCDMA)系统架构的车载通信(IVC)系统,并采用分析和仿真方法对系统性能进行了分析和计算。SAC-OCDMA系统的一个重要特点是,通过平衡检测方案,可以通过固定同相互相关值的码序列消除多址干扰。与电复用方法相比,光复用方法的优点是无电磁干扰,安全性提高。分析了修改素码(MPCs)和沃尔什-哈达玛码作为SAC-OCDMA系统签名码的性能。本文首先利用OptiSystem软件进行商业仿真,给出了SAC-OCDMA系统结构中mpc的仿真结果。仿真结果表明,mpc的误码率优于传统的沃尔什-阿达玛码,特别是在接收效应功率较大的情况下。眼图还显示,具有mpc的SAC-OCDMA系统比沃尔什-阿达玛码显示更宽的开口。
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引用次数: 2
Study for the effect of hasty state while driving on potential risks 研究驾驶时匆忙状态对潜在风险的影响
Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425299
M. Miyaji
Driver's hasty state is one of psychosomatic states which may result in traffic accidents. This paper describes analytical effects on hasty state for driver's perception by means of detecting the change of driver's useful view of field and time to perception of moving objects. Then we proposed a concept of a function for detecting driver's hasty states for an intelligent driving support system. The function may become one of the content of the next generation Vehicle - Infrastructure cooperative safety system by means of using ultra high speed communication technology in the next stage.
驾驶员匆忙状态是可能导致交通事故发生的心身状态之一。通过检测驾驶员有用视场和时间对运动物体感知的变化,分析了匆忙状态对驾驶员感知的影响。在此基础上,提出了智能驾驶辅助系统中驾驶员仓促状态检测函数的概念。在下一阶段,借助超高速通信技术,该功能可能成为下一代车辆-基础设施协同安全系统的内容之一。
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引用次数: 0
Priority code selection method of the modified binary countdown scheme for VANET 改进的VANET二进制倒计时方案的优先码选择方法
Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425282
K. Hashiura, H. Habuchi
A new selection method for the modified binary countdown scheme is proposed in this paper to make more effective use of VANET. The modified binary countdown scheme is fused with the binary countdown and slot distributed schemes. In the selection method, the transmission right of each node is kept equal because the node which transmitted a packet correctly chooses the low priority code. As the results of evaluating the average packet acquisition time and efficiency, we found that this scheme has immediacy and can tolerate changes in the number of nodes.
为了更有效地利用VANET,本文提出了一种新的改进二进制倒计时方案的选择方法。将改进的二进制倒计时方案与二进制倒计时方案和时隙分布式方案相融合。在这种选择方法中,由于正确传输数据包的节点选择了低优先级的代码,因此保持了各节点的传输权相等。通过对平均数据包获取时间和效率的评估,我们发现该方案具有即时性,并且可以容忍节点数量的变化。
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引用次数: 2
Partial cooperation in MB-OFDM UWB systems with hierarchical modulation and power allocation 基于分层调制和功率分配的MB-OFDM UWB系统的局部协作
Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425171
P. Tsao, P. Tsai
This paper presents a new cooperation scheme, i.e. partial cooperation, in MB-OFDM UWB systems for performance enhancement with high throughput and power efficiency. We first take advantage of the available subbands and design an efficient scheme in the time-frequency plane to deliver information bits to the relay node. Then, based on Game Theory, we propose to use hierarchical modulation, which is capable to offer adaptability and flexibilities to attract even a busy relay node that keeps its own communication link participating in cooperation. We also obtain the optimal power allocation coefficients for the proposed partial cooperation scheme. In addition, the optimal constellation priority parameter of hierarchical modulation is also evaluated. Both analytic and simulation results show that the proposed partial cooperation scheme not only achieves performance enhancement but also can upgrade system utilities of both links to get a win-win solution.
本文提出了一种新的合作方案,即部分合作,以提高MB-OFDM超宽带系统的性能,同时提高系统的吞吐量和功率效率。我们首先利用可用的子带,在时频平面上设计了一种有效的方案来向中继节点传递信息位。然后,基于博弈论,我们提出使用分层调制,它能够提供适应性和灵活性,即使是繁忙的中继节点,也可以保持自己的通信链路参与合作。给出了部分合作方案的最优功率分配系数。此外,还对分层调制的最优星座优先级参数进行了评估。分析和仿真结果表明,所提出的部分合作方案不仅实现了性能的提升,而且可以提升两个链路的系统效用,从而达到双赢的解决方案。
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引用次数: 0
An evaluation of error reduction by indirect path in forward-looking radar network systems 前视雷达网络系统中间接路径减小误差的评估
Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425180
Yusuke Yoshida, Hiroyuki Hatano, K. Sugiyama
We focus on the reduction of the positioning errors on radar network systems. The radar network systems can achieve reliable detection and wide observation area by using multiple sensors. However, the accuracy of the positioning depends a great deal on the arrangement of the sensors. For example, if receivers were arranged on a straight line, the large error in the same direction of the line is generated. This is because the target is observed from only one direction, which is called as one side observation. In order to reduce the error, we proposed novel algorithm which uses not only a direct path but also reflected multipath. In this paper, we will introduce our method and present estimation performance by computer simulations.
重点研究了雷达网络系统定位误差的减小问题。雷达网络系统采用多传感器,可以实现可靠的探测和大范围的观测。然而,定位的精度在很大程度上取决于传感器的布置。例如,如果将接收机放置在一条直线上,则会在同一方向上产生较大的误差。这是因为只从一个方向观察目标,称为单侧观察。为了减小误差,我们提出了一种既使用直接路径又使用反映多路径的新算法。在本文中,我们将介绍我们的方法,并通过计算机仿真给出估计性能。
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引用次数: 3
Is CSMA able to coordinate multiple access in vehicular radio channels effectively? CSMA是否能够有效地协调车载无线电信道的多址接入?
Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425293
Jens Mittag, H. Hartenstein
The first generation of inter-vehicle communication networks will most likely be based on the IEEE 802.11p standard. That is, they are going to deploy Carrier Sense Multiple Access (CSMA) to coordinate channel access among neighboring vehicles. Recently, concerns have been raised that fast-fading propagation conditions, i.e. a time- and frequency-selective fading as reported by several measurement campaigns in highway environments, might challenge the effectiveness of CSMA. These concerns also lead to the situation that alternative medium access control solutions are being discussed in standardization bodies. In this paper, we evaluate whether these concerns are justified or not. In comparison to previous studies, we use a high fidelity network simulator to study the extent by which the effectiveness of CSMA is reduced if such fading propagation conditions are considered. We also resolve the two reasons that may cause incoordination - either simultaneous transmission times or hidden terminal situations - and conclude that CSMA is able to effectively coordinate multiple access in vehicular radio channels as long as the load offered to the channel does not approach the maximum capacity.
第一代车辆间通信网络很可能基于IEEE 802.11p标准。也就是说,他们将部署载波感知多址(CSMA)来协调相邻车辆之间的信道访问。最近,人们开始关注快速衰落传播条件,即在高速公路环境中进行的一些测量活动所报告的时间和频率选择性衰落,这可能会挑战CSMA的有效性。这些问题还导致标准化机构正在讨论替代介质访问控制解决方案。在本文中,我们评估这些担忧是否合理。与以往的研究相比,我们使用高保真网络模拟器来研究在考虑这种衰落传播条件下CSMA的有效性降低的程度。我们还解决了可能导致不协调的两个原因-同时传输时间或隐藏终端情况-并得出结论,只要提供给信道的负载不接近最大容量,CSMA就能够有效地协调车载无线电信道中的多路接入。
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引用次数: 7
Evaluation approaches of fuel saving and carbon reduction benefits for arterial signal retiming 动脉信号重配的节能减碳效益评价方法
Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425201
Weihsin Lin, Yi-ru Su, Francis Chang, Kluo-Yueh Chen, Shin-Hshien Huang
This paper compares three evaluation approaches of energy saving and carbon reduction benefits for arterial signal retiming, including simulation of VISSIM and IDAS software and traffic survey of intersection stop delay. A signal retiming project of 18 intersections is evaluated by these approaches. Since the simulation of VISSIM is performed by each vehicle and second, its evaluation benefits are the highest among these approaches. IDAS is a macro-scope simulation software and utilizes link average speed increase to estimate benefits with no considering of the reduction of intersection delay. Thus its benefits are the lowest. Evaluation benefits of the intersection stop delay survey are between VISSIM and IDAS results. From analysis of these results, the future application of these evaluation approaches is proposed.
本文比较了VISSIM和IDAS软件仿真以及交叉口停车延迟交通调查三种主干道信号重配节能减排效益评价方法。利用这些方法对18个交叉口的信号重配方案进行了评价。由于VISSIM的仿真是以每辆车和第二辆车为单位进行的,因此其评估效益在这些方法中是最高的。IDAS是一种宏观仿真软件,在不考虑交叉口延迟减少的情况下,利用链路平均速度增加来估算效益。因此,它的好处是最低的。交叉口停车延迟调查的评价效益介于VISSIM和IDAS结果之间。通过对这些结果的分析,提出了这些评价方法的应用前景。
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引用次数: 3
A novel design for full automatic parking system 一种全新的全自动泊车系统设计
Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425159
C. Chen, C. Hsu, Chi-Chun Yao
This paper proposed an obstacle orientation algorithm and a path planning of multi-turn mode to apply in automatic parking systems. The vehicle parks at a low velocity by developing a braking strategy. In addition to the design of controllers, a speed trajectory consisting of acceleration, constant speed, and deceleration is planned in order to provide the driver more comfortable feeling. According to the result of the verification tests, the obstacle orientation algorithm could accurately identify the 2D coordinate. And the proposed path planning of multi-turn mode saves one meter than the traditional two-turn mode. It makes the parking space only need 1.28 times the vehicle length. The vehicle control is implemented using Fuzzy-PID tracking control. System performance and tracking ability are verified in hardware and software implementations with very low cost.
提出了一种适用于自动泊车系统的障碍物定位算法和多转弯模式下的路径规划。通过开发制动策略,车辆在低速停车。除了控制器的设计外,还规划了一个由加速、匀速和减速组成的速度轨迹,以便为驾驶员提供更舒适的感觉。验证试验结果表明,障碍物定位算法能够准确识别出二维坐标。所提出的多转弯路径规划比传统的两转弯路径规划节省1米。这使得停车位只需要车辆长度的1.28倍。车辆控制采用模糊pid跟踪控制。系统的性能和跟踪能力在硬件和软件实现中得到了验证,且成本很低。
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引用次数: 18
On the security of a unique batch authentication protocol for vehicle-to-grid communications 车网通信唯一批认证协议的安全性研究
Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425182
Huei-Ru Tseng
The concept of vehicle-to-grid (V2G) is that electric vehicles (EVs) communicate with the smart grid to sell demand response services by delivering electricity into the grid. By letting EVs discharge during peak hours and charge during off-peak hours, V2G networks could bring numerous social and technical benefits to the smart grid. Due to the scale of the network, the speed of the vehicles, their geographic positions, and the very sporadic connectivity between them, V2G communications have the crucial requirements of fast authentication. In 2011, Guo et al. proposed a unique batch authentication protocol for V2G communications. They claimed their protocol is strong enough to defend against security attacks. In this paper, we investigate the security of Guo et al.'s protocol. More precisely, we show that either the vehicle or aggregator can easily generate a collection of bogus signatures that satisfies the batch verification criterion, i.e., forgery attacks. Any attackers can easily forge signatures satisfying the batch verification criterion without the knowledge of the signer's private key. Consequently, Guo et al.'s protocol is not secure at all.
车辆到电网(V2G)的概念是电动汽车(ev)与智能电网通信,通过向电网输送电力来销售需求响应服务。通过让电动汽车在高峰时段放电,在非高峰时段充电,V2G网络可以为智能电网带来许多社会和技术效益。由于网络的规模、车辆的速度、它们的地理位置以及它们之间非常零散的连接,V2G通信对快速认证有着至关重要的要求。2011年,Guo等人提出了一种独特的V2G通信批认证协议。他们声称他们的协议足够强大,可以抵御安全攻击。在本文中,我们研究了郭等人协议的安全性。更准确地说,我们表明,车辆或聚合器都可以很容易地生成满足批验证标准的伪造签名集合,即伪造攻击。任何攻击者都可以在不知道签名者私钥的情况下,轻松伪造出满足批验证条件的签名。因此,郭等人的协议根本不安全。
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引用次数: 16
Optimal bandwidth adaptation for layered video multicasting in IEEE 802.11 WLANs IEEE 802.11 wlan中分层视频多播的最佳带宽适应
Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425244
Yen-Ting Chen, Hung-Yi Teng, Ren-Hung Hwang, Jeng-Farn Lee
With widespread adoption of wireless local area networks (WLANs), video dissemination over wireless links such as video telephony, video gaming, and mobile TV broadcasting have become fast growing applications. Since wireless channel is error-prone, the receiving data rate of mobile stations (MSs) needs to be selected properly to avoid high packet loss rate and serious service quality degradation. In addition, to enhance reliability of video multicasting, application-layer forward error correction (AL-FEC) is a promising approach against packet losses. However, at the WLAN access point (AP), how to adaptively select a proper combination of transmission rate and AL-FEC code rate to multicast layered videos in WLANs becomes an important issue. In this paper, we propose a reward-based bandwidth adaptation mechanism to dynamically determine the best combination of transmission rate and AL-FEC code rate to multicast layered video in IEEE 802.11 WLANs. Our goal is to maximize the system reward which represents the video quality experienced on all users, under a given resource budget. A reward-based policy iteration algorithm is proposed as a heuristic approach to solve the optimization problem and its performance is compared with that of two baseline algorithms: exhaustive search and genetic algorithm. We demonstrate the performance of our approach via simulations. The simulation results show our approach can provide better service quality even through system resource is sparse.
随着无线局域网(wlan)的广泛采用,视频电话、视频游戏和移动电视广播等无线链路上的视频传播已经成为快速增长的应用。由于无线信道容易出错,需要合理选择移动站的接收数据速率,以避免丢包率高、业务质量严重下降。此外,为了提高视频组播的可靠性,应用层前向纠错(AL-FEC)是一种很有前途的防止丢包的方法。然而,在无线局域网接入点(AP)上,如何自适应地选择合适的传输速率和AL-FEC码率组合来传输无线局域网中的多播分层视频成为一个重要问题。本文提出了一种基于奖励的带宽自适应机制,以动态确定IEEE 802.11 wlan中组播分层视频的传输速率和AL-FEC码率的最佳组合。我们的目标是在给定的资源预算下,最大限度地提高系统奖励,这代表了所有用户体验到的视频质量。提出了一种基于奖励的策略迭代算法作为求解优化问题的启发式方法,并将其性能与穷举搜索和遗传算法两种基准算法进行了比较。我们通过仿真验证了该方法的性能。仿真结果表明,该方法在系统资源稀疏的情况下仍能提供较好的服务质量。
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引用次数: 1
期刊
2012 12th International Conference on ITS Telecommunications
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