2012 12th International Conference on ITS Telecommunications最新文献_第6页

An optical CDMA method for in-vehicle information service 一种车载信息服务的光CDMA方法

2012 12th International Conference on ITS Telecommunications Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425195

Chih-Ta Yen, Wen-Bin Chen

{"title":"An optical CDMA method for in-vehicle information service","authors":"Chih-Ta Yen, Wen-Bin Chen","doi":"10.1109/ITST.2012.6425195","DOIUrl":"https://doi.org/10.1109/ITST.2012.6425195","url":null,"abstract":"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.","PeriodicalId":143706,"journal":{"name":"2012 12th International Conference on ITS Telecommunications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126921016","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

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

2012 12th International Conference on ITS Telecommunications Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425299

M. Miyaji

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

2012 12th International Conference on ITS Telecommunications Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425282

K. Hashiura, H. Habuchi

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

2012 12th International Conference on ITS Telecommunications Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425171

P. Tsao, P. Tsai

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

2012 12th International Conference on ITS Telecommunications Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425180

Yusuke Yoshida, Hiroyuki Hatano, K. Sugiyama

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?

2012 12th International Conference on ITS Telecommunications Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425293

Jens Mittag, H. Hartenstein

{"title":"Is CSMA able to coordinate multiple access in vehicular radio channels effectively?","authors":"Jens Mittag, H. Hartenstein","doi":"10.1109/ITST.2012.6425293","DOIUrl":"https://doi.org/10.1109/ITST.2012.6425293","url":null,"abstract":"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.","PeriodicalId":143706,"journal":{"name":"2012 12th International Conference on ITS Telecommunications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129696989","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: 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

2012 12th International Conference on ITS Telecommunications Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425201

Weihsin Lin, Yi-ru Su, Francis Chang, Kluo-Yueh Chen, Shin-Hshien Huang

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

2012 12th International Conference on ITS Telecommunications Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425159

C. Chen, C. Hsu, Chi-Chun Yao

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

2012 12th International Conference on ITS Telecommunications Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425182

Huei-Ru Tseng

{"title":"On the security of a unique batch authentication protocol for vehicle-to-grid communications","authors":"Huei-Ru Tseng","doi":"10.1109/ITST.2012.6425182","DOIUrl":"https://doi.org/10.1109/ITST.2012.6425182","url":null,"abstract":"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.","PeriodicalId":143706,"journal":{"name":"2012 12th International Conference on ITS Telecommunications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132477255","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: 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

2012 12th International Conference on ITS Telecommunications Pub Date : 2012-11-01 DOI: 10.1109/ITST.2012.6425244

Yen-Ting Chen, Hung-Yi Teng, Ren-Hung Hwang, Jeng-Farn Lee

{"title":"Optimal bandwidth adaptation for layered video multicasting in IEEE 802.11 WLANs","authors":"Yen-Ting Chen, Hung-Yi Teng, Ren-Hung Hwang, Jeng-Farn Lee","doi":"10.1109/ITST.2012.6425244","DOIUrl":"https://doi.org/10.1109/ITST.2012.6425244","url":null,"abstract":"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.","PeriodicalId":143706,"journal":{"name":"2012 12th International Conference on ITS Telecommunications","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114334370","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