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2007 IEEE 66th Vehicular Technology Conference最新文献

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Experimental Analysis of Broadcast Reliability in Dense Vehicular Networks 密集车联网广播可靠性实验分析
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-12-01 DOI: 10.1109/MVT.2008.917439
Kishore Ramachandran, M. Gruteser, R. Onishi, T. Hikita
{"title":"Experimental Analysis of Broadcast Reliability in Dense Vehicular Networks","authors":"Kishore Ramachandran, M. Gruteser, R. Onishi, T. Hikita","doi":"10.1109/MVT.2008.917439","DOIUrl":"https://doi.org/10.1109/MVT.2008.917439","url":null,"abstract":"Dedicated short range communications (DSRC)-based communications enable novel automotive safety applications such as an extended electronic brake light or intersection collision avoidance. These applications require reliable wireless communications even in scenarios with very high vehicle density, where these networks are primarily interference-limited. Given the uncertainties associated with current simulation models, particularly their interference models, it is critical to experimentally validate network performance for such scenarios. Towards this goal, we present a systematic, large-scale experimental study of packet delivery rates in a dense environment of 802.11 transmitters. We show that even with 100 transmitters in communication range with a frame size of 128 bytes and a bit-rate of 6Mbps, (a) most receivers can decode over 1500 pps in a saturated network, which corresponds to a packet delivery rate of 45% and (b) the mean packet delivery rate, for 10 pps per node workload that emulates vehicular safety applications, is about 95%. These results demonstrate that a COTS 802.11 implementation can correctly decode many packets under collision due to physical layer capture and can serve as a reference scenario for validation of network simulators.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126005866","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: 18
A Combined Design to Provide QoS for Mobile Ad Hoc Networks 为移动自组织网络提供QoS的组合设计
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.317
M. Xu, Mingde Zhao, Wenli Shen, Aiping Huang
{"title":"A Combined Design to Provide QoS for Mobile Ad Hoc Networks","authors":"M. Xu, Mingde Zhao, Wenli Shen, Aiping Huang","doi":"10.1109/VETECF.2007.317","DOIUrl":"https://doi.org/10.1109/VETECF.2007.317","url":null,"abstract":"To transmit real-time traffic in mobile ad hoc networks, a combined design of TDMA MAC and routing protocol was proposed. Most approaches proposed recently applied schemes in the routing protocol to provide QoS and paid no attention to the MAC design. Actually, the ability to provide QoS heavily depends on how well the resources are managed in the MAC layer. In our work, we try to focus on the design of MAC protocol and combine it with AODV to provide QoS. The QoS requirement of a certain session can be satisfied if all nodes in the route reserve slots with the corresponding frame length. It is convenient to manage slot assignment information and select a slot with a certain frame length in a binary tree structure. Simulation results are presented to verify the performance of the combined design.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116896993","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
SDMA, Multiuser Diversity, and BF Using Array Antenna in OFDMA System OFDMA系统中使用阵列天线的SDMA、多用户分集和BF
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.150
C. Yeh, D. Kwon
{"title":"SDMA, Multiuser Diversity, and BF Using Array Antenna in OFDMA System","authors":"C. Yeh, D. Kwon","doi":"10.1109/VETECF.2007.150","DOIUrl":"https://doi.org/10.1109/VETECF.2007.150","url":null,"abstract":"A scheme which supports SDMA and enhances system performance using gains from multiuser diversity as well as beamforming is proposed. The proposed scheme is a kind of closed-loop multiuser MIMO applications applicable to both in the uplink and downlink with a small amount of overhead to construct downlink preamble which is inevitable for the mobile station to determine feedback information which shall be reported to base station. Based on the feedback from multiple users, BS exploits benefits from multiuser diversity by scheduling and implements SDMA using directional beamforming with half-wavelength spaced array antenna. Performance enhancement is verified by link level simulation and applicable scenarios are suggested.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117149527","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
Distributed Computing Through Web Browser 基于Web浏览器的分布式计算
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.424
F. Boldrin, C. Taddia, G. Mazzini
{"title":"Distributed Computing Through Web Browser","authors":"F. Boldrin, C. Taddia, G. Mazzini","doi":"10.1109/VETECF.2007.424","DOIUrl":"https://doi.org/10.1109/VETECF.2007.424","url":null,"abstract":"This paper proposes a new approach for distributed computing. The main novelty consists in the exploitation of web browsers as clients, thanks to the availability of Javascript and AJAX. The described solution has two main advantages: it is client- free, so no additional programs have to be installed to perform the computation, and it requires low CPU usage, so clientside computation is no invasive for users. The solution is developed using AJAX technology embedding a pseudoclient into a web page that hosts che computation. While users browse the hosting web page, computation takes place resolving single subproblems and sending the solution to the serverside part of the system. The new architecture has been tested through various performance metrics by implementing two examples of distributed computing, the RSA crack and the correlation index between genetic data sets. Results have shown good feasibility of this approach.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117186883","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: 23
Capacity Planning Service for Radio Access CDMA Networks 无线接入CDMA网络容量规划服务
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.41
D. Calin, A. Mackay, T. Morawski, Hardy Zhang
{"title":"Capacity Planning Service for Radio Access CDMA Networks","authors":"D. Calin, A. Mackay, T. Morawski, Hardy Zhang","doi":"10.1109/VETECF.2007.41","DOIUrl":"https://doi.org/10.1109/VETECF.2007.41","url":null,"abstract":"The paper describes a holistic capacity planning methodology for radio access networks and presents a case study focusing on the CDMA technology. It addresses the complex problem of how the Radio Access Network (RAN) should be optimally equipped to accommodate traffic growth (and fluctuations in traffic patterns in broader terms) over time, while fulfilling the Quality of Service (QoS) requirements of a Mobile Network Operator. A bottom-up approach is used, i.e. first it evaluates the required resources over the air-interface; then the base stations hardware resources, and finally, the transport/ backhaul domain dimensioning. This methodology provides the rapid and repeatable dimensioning, which is required to implement just-in-time provisioning processes, and support the network cost modeling an operator requires to quickly model quality of service and call plan strategy. The approach has been largely tested with field data and is being used by several mobile network operators.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"2008 26","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120970160","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 Unitary MUSIC-Like Algorithm for Coherent Sources 相干源的统一类音乐算法
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.126
N. Tayem, M. Naraghi-Pour
{"title":"A Unitary MUSIC-Like Algorithm for Coherent Sources","authors":"N. Tayem, M. Naraghi-Pour","doi":"10.1109/VETECF.2007.126","DOIUrl":"https://doi.org/10.1109/VETECF.2007.126","url":null,"abstract":"This paper proposes a method for direction of arrival (DOA) estimation which can be applied in case of both non-coherent and coherent sources. In comparison to the well-known subspace algorithms such as MUSIC, the proposed method has several advantages. First, in contrast to MUSIC, no forward/backward spatial smoothing for the covariance matrix is needed in the case of coherent sources. Second, the proposed method is more suitable for realtime implementation since it only requires one or a few snapshots in order to provide an accurate DOA estimation, whereas MUSIC requires a large number of snapshots. Third, the proposed method exploits the eigenvalue decomposition (EVD) of a real-valued covariance matrix thereby reducing the computational cost by at least a factor of four. Simulation results show that the proposed method can estimate the DO As of the incident sources with high accuracy even when the sources are coherent.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127149361","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
Joint Spatial Coding and Spatial Multiplexing: Optimal and Suboptimal Criteria 联合空间编码和空间复用:最优和次优准则
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.144
Lihua Li, Ping Zhang, Xiaoling Li, Yong-Hua Song, W. Yao
{"title":"Joint Spatial Coding and Spatial Multiplexing: Optimal and Suboptimal Criteria","authors":"Lihua Li, Ping Zhang, Xiaoling Li, Yong-Hua Song, W. Yao","doi":"10.1109/VETECF.2007.144","DOIUrl":"https://doi.org/10.1109/VETECF.2007.144","url":null,"abstract":"In this contribution, spatial coding diversity is combined with spatial multiplexing to get higher joint gains on ensuring both low error rate and high spectrum efficiency. A general mathematical model of joint spatial coding and multiplexing (JSCM) is proposed and analyzed. Optimal criteria and a suboptimal iterative algorithm on the design of JSCM are studied. Performance of JSCM is proved by simulations from various aspects.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127205552","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
A Novel Multi-Antenna Based Non-Line-of-Sight Error Mitigating Algorithm 一种新的基于多天线的非视距误差抑制算法
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.158
Xiaoxuan Zhu, Mingyang Shi, Xiaoguang Wu, Xiaofeng Tao, Ping Zhang
{"title":"A Novel Multi-Antenna Based Non-Line-of-Sight Error Mitigating Algorithm","authors":"Xiaoxuan Zhu, Mingyang Shi, Xiaoguang Wu, Xiaofeng Tao, Ping Zhang","doi":"10.1109/VETECF.2007.158","DOIUrl":"https://doi.org/10.1109/VETECF.2007.158","url":null,"abstract":"The Non-Line-of-Sight (NLOS) propagation effect has been considered as one of the most important issues in the location estimation especially in urban environment with serious blocking of direct paths. In this paper, we develop a new algorithm to mitigate the NLOS errors in location estimation by distributed multi-antenna. Utilizing the relativity between TOAs obtained from different antennas in a multi-antenna array, the positions of scatterers that cause the NLOS propagation, as well as the distances between mobile stations (MSs) and scatterers, are estimated. Then with appropriate location algorithm, the locations of MSs are obtained with information of scatterers. Simulation results show that this algorithm can mitigate NLOS errors effectively and improve the performance of TOA/TDOA based location algorithm in NLOS environment significantly.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115058168","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
A Model for Time-Efficient HSDPA Simulations 一种高效HSDPA仿真模型
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.180
D. Staehle, Andreas Mäder
{"title":"A Model for Time-Efficient HSDPA Simulations","authors":"D. Staehle, Andreas Mäder","doi":"10.1109/VETECF.2007.180","DOIUrl":"https://doi.org/10.1109/VETECF.2007.180","url":null,"abstract":"Models for the downlink capacity of WCDMA systems with dedicated channels as specified in the UMTS Release '99 rely on the orthogonality factor for approximating the intra-cell interference due to multi-path propagation. This model is no longer applicable for the HSDPA as the performance of fast scheduling and adaptive modulation and coding depends on the small-scale fading effects. This leads to the problem on how to produce reliable statistics for the long-term system-level behavior when small-scale fading effects are not negligible. In this paper we introduce a general framework on how to perform time-efficient simulations that capture the effects of small-scale fading.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115522439","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: 10
Adaptive Conjugate Gradient DFEs for Wideband MIMO Systems Using Galerkin Projections 基于伽辽金投影的宽带MIMO系统自适应共轭梯度差分
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.113
V. Kekatos, A. Lalos, K. Berberidis
{"title":"Adaptive Conjugate Gradient DFEs for Wideband MIMO Systems Using Galerkin Projections","authors":"V. Kekatos, A. Lalos, K. Berberidis","doi":"10.1109/VETECF.2007.113","DOIUrl":"https://doi.org/10.1109/VETECF.2007.113","url":null,"abstract":"Three new adaptive equalization algorithms for wireless systems operating over frequency selective MIMO channels are proposed. The problem of the MIMO DFE design is formulated as a set of linear equations with multiple right-hand sides (RHS) evolving in time. By applying an adaptive modified conjugate gradient algorithm, originally proposed for a single linear system, to the problem at hand, we arrive at an equalizer of performance identical to RLS, numerically robust, but of higher computational cost. To reduce its complexity, two updating strategies of the equalizer filters are derived based on Galerkin projection in time and space respectively. The two alternative schemes exhibit a complexity lower than RLS while offering slightly inferior convergence properties.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122974915","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
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