{"title":"Reliably Suppressed Broadcasting for Vehicle-to-Vehicle Communications","authors":"John Lee, Wai Chen","doi":"10.1109/VETECS.2010.5493961","DOIUrl":"https://doi.org/10.1109/VETECS.2010.5493961","url":null,"abstract":"Vehicle-to-Vehicle (V2V) communications can be a promising means for providing active safety in driving. Broadcasting can be an essential technology for the dissemination of safety information from a vehicle to vehicles and a roadside unit (RSU) to vehicles. In this paper we propose a reliably suppressed broadcasting protocol for V2V communications. The proposed protocol effectively selects forwarding nodes in consideration of reliability in data delivery, efficiency in forwarding overhead, and delay, such that dissemination for safety information can be achieved with a high delivery ratio and small number of forwarding nodes. The proposed protocol does not require position information and neighboring information. With our suppression technique used in the proposed protocol, we enhance an existing position-based broadcasting protocol. We evaluate the performances of our proposed protocol and the enhanced position-based protocol by comparing them with other protocols through simulations. We also implement interoperability between the proposed protocol and the enhanced position-based protocol to support broadcasting on a vehicle ad-hoc network comprised of both vehicles with GPS and vehicles without GPS.","PeriodicalId":325246,"journal":{"name":"2010 IEEE 71st Vehicular Technology Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131350413","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}
Vineet Kumar, Lan Lin, Daniel Krajzewicz, F. Hrizi, O. Bonastre, J. Gozálvez, R. Bauza
{"title":"iTETRIS: Adaptation of ITS Technologies for Large Scale Integrated Simulation","authors":"Vineet Kumar, Lan Lin, Daniel Krajzewicz, F. Hrizi, O. Bonastre, J. Gozálvez, R. Bauza","doi":"10.1109/VETECS.2010.5494182","DOIUrl":"https://doi.org/10.1109/VETECS.2010.5494182","url":null,"abstract":"The European Union (EU) Framework Program 7 (FP7) funded project, iTETRIS (An Integrated Wireless and Traffic Platform for Real-Time Road Traffic Management Solutions) targets to extend state of art in simulation of wireless vehicular cooperative systems for evaluation of road traffic management services and applications. In particular, iTETRIS addresses four important and distinct challenges: (a) road traffic and wireless integrated open-source simulation platform, (b) large scale trials, (c) realistic Vehicle to Vehicle (V2V) and Vehicle to Infrastructure (V2I) communication simulation and (d) dynamic, distributed and self-autonomous Intelligent Transport Systems (ITS) applications based on cooperative systems. iTETRIS will provide a standard compliant, open-source integrated communication and traffic platform suited for large scale scenario simulation. This Paper addresses extension of traffic simulator being used in iTETRIS, scalability studies of networking simulator, which have been achieved as project results. Further the paper presents the adaptation of the Intelligent Communications for Transport Systems (ICTS) reference architecture functionalities being developed by the European Telecommunication Standard Institute (ETSI) at its Technical Committee (TC) on ITS.","PeriodicalId":325246,"journal":{"name":"2010 IEEE 71st Vehicular Technology Conference","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131363177","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}
Zhen Liu, T. B. Sørensen, J. Wigard, P. Jolma, T. Kolding, P. Mogensen
{"title":"A Site-Specific Study of In-Building Wireless Solutions","authors":"Zhen Liu, T. B. Sørensen, J. Wigard, P. Jolma, T. Kolding, P. Mogensen","doi":"10.1109/VETECS.2010.5493731","DOIUrl":"https://doi.org/10.1109/VETECS.2010.5493731","url":null,"abstract":"This paper studies the different ways of extending wireless coverage for high data rates and improving the data capacity in a building. The solutions considered include deployments of single or multiple small base stations, i.e. Picocell or Femtocell, and distributed antenna system, operated on the same frequency as the macro cellular network. We look at the radio performance of each solution in a LTE downlink context with in-building path loss values retrieved from real-life measurements. The performance is compared by means of maximum supportable user numbers and average system throughput. Potential gains by hard frequency reuse in the building and QoS based packet scheduling are examined. Simulation results show the robustness of the proposed distributed antenna system and the conditions for multi-Femtocell deployment.","PeriodicalId":325246,"journal":{"name":"2010 IEEE 71st Vehicular Technology Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130018894","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}
{"title":"An Energy Efficient Clustering Scheme for Mobile Ad Hoc Networks","authors":"Minming Ni, Z. Zhong, Hao Wu, Dongmei Zhao","doi":"10.1109/VETECS.2010.5494186","DOIUrl":"https://doi.org/10.1109/VETECS.2010.5494186","url":null,"abstract":"This paper proposes an Energy Efficient Clustering Scheme for mobile ad hoc networks. In the initial clustering stage, a node's residual energy, nearby topology, relative location and relative mobility are used for determining whether the node is suitable for being a cluster head. In the cluster maintaining stage, a strategy called Distance Estimation Broadcasting is designed to help a cluster member to estimate the distance between itself and its cluster head. Thus, the cluster members can use less energy to accomplish the data transmission. Moreover, a dynamic calculated Off-Duty Threshold is proposed to trigger the re-clustering operation when needed. Simulation results show that the proposed clustering scheme performs better than the previous Weighted Clustering Algorithm and Distributed Weighted Clustering Algorithm.","PeriodicalId":325246,"journal":{"name":"2010 IEEE 71st Vehicular Technology Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130115176","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}
{"title":"Adaptive-Weighting Schemes for Location-Based Services over Heterogeneous Wireless Networks","authors":"Sheng-Cheng Yeh, Wu-Hsiao Hsu, Yih-Shyh Chiou","doi":"10.1109/VETECS.2010.5494100","DOIUrl":"https://doi.org/10.1109/VETECS.2010.5494100","url":null,"abstract":"Global positioning systems, widely known as GPSs, provide timing, navigation, and positioning signals to military and civilian users. When a GPS receiver receives satellite signals, the distance between the satellite and the user is first calculated, and then the user's current position is located using the triangulation method. However, there is a possibility that atmospheric conditions, multipath fading, and shadowing effects could have an impact on the satellite signal. As wireless technology has progressed, different user locations and locating systems have been invented, such as the WiFi locating system, which mainly uses received signal strength indication (RSSI) to set up radio maps that provide locations, and RF models to estimate the locations of a moving user. The Zigbee locating system tracks the position of blind nodes, using RF signal strength calculation and known coordinates to estimate the distance between reference points. Using the triangulation method, Zigbee searches for blind node coordinates. This research proposes an adaptive-weighting locating mechanism within wireless heterogeneous networks, which enhances GPS's ability to receive signals in buildings and precision in estimating locations.","PeriodicalId":325246,"journal":{"name":"2010 IEEE 71st Vehicular Technology Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131594248","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}
{"title":"Fast Correlation for Gold Large Sets of Kasami Sequences","authors":"P. Zhang, Jiang Wu, Jie Wang","doi":"10.1109/VETECS.2010.5493903","DOIUrl":"https://doi.org/10.1109/VETECS.2010.5493903","url":null,"abstract":"Compared with FFT (Fast Fourier Transform), only addition and subtraction operations are involved in FMT (Fast M-sequence Transform). In this paper, three classes of fast correlation algorithms for Gold large sets of Kasami sequences are proposed, where FMT is used for fast computation instead of FFT. Analytic results show that computational complexity can be greatly reduced by V-FMT Class and U-FMT Class algorithms. These proposed correlation algorithms with possible applications in low spectral density wireless communications such as the DS/CDMA system.","PeriodicalId":325246,"journal":{"name":"2010 IEEE 71st Vehicular Technology Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129378737","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}
{"title":"Optimum Weighting for Adaptive Array Antennas under Spectrum Sharing Environments","authors":"H. Fujii, T. Asai, T. Ohya","doi":"10.1109/VETECS.2010.5493622","DOIUrl":"https://doi.org/10.1109/VETECS.2010.5493622","url":null,"abstract":"We use the method of Lagrange multipliers to derive the optimum weighting for adaptive array antennas in a spectrum-sharing environment. The formula proposed for calculating the weights yields the structure of the special cases of conventional models as described by Frost and Applebaum. An evaluation of performance is given in terms of the signal to interference power ratio and the results are compared with those of a matched filter, a null-space based method, and a linearly constraint adaptive array. We also show the transmit power control based on the residual interference level works well and reveal the relationship between the channel estimation accuracy and achievable channel capacity under the spectrum sharing environments.","PeriodicalId":325246,"journal":{"name":"2010 IEEE 71st Vehicular Technology Conference","volume":"367 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132806662","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}
{"title":"Mobile WiMAX: Impact of Mobility on the Performance of Limited Feedback Linear Precoding","authors":"Mai Tran, A. Nix, A. Doufexi","doi":"10.1109/VETECS.2010.5494115","DOIUrl":"https://doi.org/10.1109/VETECS.2010.5494115","url":null,"abstract":"The mobile WiMAX standard (802.16e) uses multiple-input multiple-output (MIMO) limited feedback linear precoding to exploit the channel state information at the transmitter. Although the performance of limited feedback linear precoding in relation to traditional open-loop MIMO has been extensively studied in the literature, these studies commonly assume a zero-lag feedback channel. However, due to the mobile nature of the mobile station (MS), the channel feedback information at the base station (BS) is incorrect because of an inherent delay between the time the MS estimates the channel feedback information and the time it is used in the BS. This results in performance degradation compared to a zero-lag feedback channel. To date, few researchers have studied the impact of MS velocity and Doppler spread on the performance of limited feedback linear precoding. Simulation results show that the performance of the mobile WiMAX precoded system degrades significantly as the MS velocity increases. At a velocity of 3km/h the precoded system degrades by 0.1-0.2dB in terms of array gain. However, the performance drops considerably when the velocity exceeds 10 km/h. At high MS velocities (i.e., 120 km/h), the linear precoding technique fails to provide any benefits. In this high mobility case we show that a linear precoding MIMO system with more antennas experiences the same performance as an open-loop MIMO system with fewer antennas.","PeriodicalId":325246,"journal":{"name":"2010 IEEE 71st Vehicular Technology Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130697404","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}
Yuichi Kazama, Akira Yamasaki, K. Adachi, M. Nakagawa
{"title":"Impact of Frequency Diversity and Multi-User Diversity in IFDMA","authors":"Yuichi Kazama, Akira Yamasaki, K. Adachi, M. Nakagawa","doi":"10.1109/VETECS.2010.5493908","DOIUrl":"https://doi.org/10.1109/VETECS.2010.5493908","url":null,"abstract":"Single-carrier frequency division multiple access (SC-FDMA) has been decided to be adopted in the uplink of the future wireless communication system. Interleaved frequency division multiple access (IFDMA), whose transmitted signal is generated in the time domain, is a candidate of SC-FDMA. The number of comb like spectrum and the spectral interval between each spectrum depend on the number of transmission data symbols Q in one IFDMA block and repetition number L. In the case of large Q and small L, large frequency diversity gain can be obtained due to the number of spectrum is increased. However, inter-chip interference (ICI) owing to the multipaths environment increases. In the multi-user environment, it is difficult to get multi-user diversity due to the decrease of the degree of freedom for channel allocation to each user with large Q and small L. On the other hand, in the case of small Q and large L, frequency diversity gain becomes smaller and ICI is decreased. Furthermore, multi-user diversity gain can be obtained due to the increase of the degree of the freedom for channel allocation. Thus, it is quite interesting to see how the parameters in IFDMA, i.e., Q and L, affect the average bit error rate (BER) performance in the multi-user environment. In this paper, we derive average BER performance of IFDMA in the multi-user environment theoretically by taking into account of frequency diversity, multi-user diversity and ICI when Q and L are changed and then average BER performance of IFDMA is compared to that of OFDM. In addition, the validity of the theoretical analysis is confirmed by computer simulation.","PeriodicalId":325246,"journal":{"name":"2010 IEEE 71st Vehicular Technology Conference","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130966072","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}
{"title":"Optimization of Linear Wireless Sensor Networks for Serial Distributed Detection Applications","authors":"G. Fabeck, R. Mathar","doi":"10.1109/VETECS.2010.5494210","DOIUrl":"https://doi.org/10.1109/VETECS.2010.5494210","url":null,"abstract":"Typical applications of wireless sensor networks include infrastructure monitoring and surveillance, where in many cases the geometry of the monitored object determines the topology of the deployed network. For example, important applications like pipeline monitoring and border surveillance feature a linear arrangement of wireless sensors. In this paper, we address the scalable optimization of linear sensor networks for serial distributed detection applications. In serial distributed detection, signal detection is performed collaboratively by multiple sensors arranged in serial until a final detection result is reached. By locally maximizing the Chernoff information at each sensor in the serial network, scalable solutions are obtained which only rely on local information. By considering the problem of detecting a deterministic signal in the presence of Gaussian noise, a detailed numerical study reveals interesting trade-offs and dependencies between communication constraints and detection performance.","PeriodicalId":325246,"journal":{"name":"2010 IEEE 71st Vehicular Technology Conference","volume":"193 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133533117","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}