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Proceedings IEEE 56th Vehicular Technology Conference最新文献

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Designing for coverage availability with different data rates - an improved methodology 设计不同数据速率的覆盖可用性——一种改进的方法
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040531
A. D. Smith
{"title":"Designing for coverage availability with different data rates - an improved methodology","authors":"A. D. Smith","doi":"10.1109/VETECF.2002.1040531","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040531","url":null,"abstract":"A new improved methodology for determining the shadow fade margin in a multi-cell network is presented. To design for a specified coverage availability requires what is commonly known as a shadow fade margin in the link budget. The shadow fade margin is dependent on the percentage area coverage, the propagation range law, and the standard deviation of the lognormal shadowing. The shadow fade margin is normally calculated assuming an omni-directional, isolated cell. To account for a network of cells, a multi-cell gain is also included in the link budget. It is shown that the multi-cell gain is also a function of coverage availability. The new, improved methodology calculates the shadow fade margin together with the variable multi-cell gain. By adopting this new methodology an operator can more accurately, estimate the range of the radio system and hence calculate the number of cell sites required to cover a given geographic region.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114320746","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
Wireless LAN performance under varied stress conditions in vehicular traffic scenarios 车辆交通场景下不同应力条件下的无线局域网性能
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040698
J.P. Singh, N. Bambos, B. Srinivasan, D. Clawin
{"title":"Wireless LAN performance under varied stress conditions in vehicular traffic scenarios","authors":"J.P. Singh, N. Bambos, B. Srinivasan, D. Clawin","doi":"10.1109/VETECF.2002.1040698","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040698","url":null,"abstract":"Mobile ad-hoc networking with wireless LAN infrastructure can be employed to build inter-vehicle communication based applications. The associated high velocities and hostile driving environments pose a challenge to the performance of a wireless LAN. This paper assesses the performance of a wireless local area network in different vehicular traffic and mobility scenarios. The network throughput and the quality of the wireless communication channel, measured on IEEE 802.11b compliant equipment, are observed to degrade with increasingly stressful communication scenarios. The test scenarios are varied by conducting the experiments under different vehicular mobility, peer-distance and driving environment conditions. We present results that can facilitate development of efficient applications for inter-vehicular communication. We also suggest optimization measures through aggression control via variations in packet size.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"124 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116329834","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: 245
Fuel cell hybrid drive train configurations and motor drive selection 燃料电池混合动力传动系统配置和电机驱动选择
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040754
S. Gay, Hongwei Gao, M. Ehsani
{"title":"Fuel cell hybrid drive train configurations and motor drive selection","authors":"S. Gay, Hongwei Gao, M. Ehsani","doi":"10.1109/VETECF.2002.1040754","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040754","url":null,"abstract":"The performance and fuel economy of a fuel cell powered vehicle are greatly improved by the use of a hybrid drive train. The hybridization allows taking full advantage of the fuel cell system efficiency characteristics. The fuel cell is thus operated at average power demand where it is the most efficient while the batteries supply the traction motors at low power demand and assist the fuel cell at high power demand. The authors propose to investigate the possible fuel cell hybrid drive trains and to compare them on the grounds of fuel economy and feasibility. Then, based on the conclusions of this first analysis, a discussion of the most suitable electric motors follows. This discussion considers the qualities of electric motors that fit both hybrid drive train and fuel cell traction requirements. The motor drive technologies considered include permanent magnet brushless DC, switched reluctance and induction motor drives.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"611 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124044287","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
A new traffic-load shedding scheme in the WCDMA mobile communication systems WCDMA移动通信系统中的一种新的业务减载方案
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040652
Won-Ik Kim, C. Kang
{"title":"A new traffic-load shedding scheme in the WCDMA mobile communication systems","authors":"Won-Ik Kim, C. Kang","doi":"10.1109/VETECF.2002.1040652","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040652","url":null,"abstract":"In a mobile telecommunication environment, an abrupt increase of mobile users in a specific cell causes an unbalanced traffic-load distribution. When the increased traffic-load exceeds the link capacity of a WCDMA system, it significantly degrades the traffic quality of the mobile users. In this paper, we propose an adaptive soft handover algorithm (ASHA) to efficiently alleviate the overloaded traffic in a cell by adjusting handover parameters. The proposed algorithm virtually reduces the service coverage of the overloaded cell without adjustment of base station transmission power. Consequently, mobile users located in the area farthest away from the heavily loaded-cell site are handed over to the lightly loaded neighboring cells, so that the traffic-load of the overloaded cell is decreased. The performance of the proposed algorithm is analyzed in path loss and shadow fading environments and is compared with that of a conventional soft handover algorithm.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126239672","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
Rejection of Bluetooth interference in 802.11 WLANs 在802.11 wlan中拒绝蓝牙干扰
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040737
A. Soltanian, R.E. Van Dyck, O. Rébala
{"title":"Rejection of Bluetooth interference in 802.11 WLANs","authors":"A. Soltanian, R.E. Van Dyck, O. Rébala","doi":"10.1109/VETECF.2002.1040737","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040737","url":null,"abstract":"We investigate the use of complex coefficient adaptive filters for interference suppression in the direct sequence spread spectrum IEEE 802.11b system. Extensive simulations are carried out to optimize the parameters of a recursive least-squares lattice filter, which mitigates the effect of a hopping narrowband interferer such as Bluetooth. The BER curves, as well as the probability of packet loss, are presented. Moreover, the limitations of the adaptive filter approach, in the suppression of multiple jammers, is determined. It is shown that with a low order filter, the hopping jammer can be successfully suppressed.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126473332","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: 4
Diversity antenna studies at 2.3 GHz for automotive applications, and MEMS-based antenna diversity switching circuit 2.3 GHz汽车分集天线研究，以及基于mems的天线分集开关电路
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040773
H.J. Song, D. Sievenpiper, H. Hsu, G. Tangonan, J. Pikulski, S. Ontiveros
{"title":"Diversity antenna studies at 2.3 GHz for automotive applications, and MEMS-based antenna diversity switching circuit","authors":"H.J. Song, D. Sievenpiper, H. Hsu, G. Tangonan, J. Pikulski, S. Ontiveros","doi":"10.1109/VETECF.2002.1040773","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040773","url":null,"abstract":"In this paper, we present work on diversity antenna experiments in the 2.3 GHz band, specifically for applications in the automotive environment. We describe the case of. two-element position diversity, and we study the effects of the antenna positions on the amount of diversity gain. The presentation consists primarily of measurement data on a moving vehicle, with software postprocessing to determine the effects of diversity combining. We present several diversity combining schemes, and describe hardware that we have built to address one of these schemes. Finally, we make several conclusions regarding the optimum geometry for antenna diversity in an automotive environment.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121962887","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 blind SLM receiver for PAR-reduced OFDM 一种用于par - reduction OFDM的盲SLM接收机
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040336
A. Jayalath, C. Tellambura
{"title":"A blind SLM receiver for PAR-reduced OFDM","authors":"A. Jayalath, C. Tellambura","doi":"10.1109/VETECF.2002.1040336","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040336","url":null,"abstract":"Selected mapping (SLM) generates a set of independent signals from an information sequence and transmits the signal with minimum peak-to-average power ratio (PAR). To recover data, the receiver is sent critical side information (SI) about the generation process. In this paper, a novel blind detection algorithm is developed for coded orthogonal frequency division multiplexing (OFDM) and SLM. The blind SLM algorithm performs well in both AWGN and fading channels in the presence of amplifier non-linearities.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127929201","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: 52
Comparison of channel frequency and impulse response estimation for space-time coded OFDM systems 空时编码OFDM系统的信道频率和脉冲响应估计比较
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040585
L. Harjula, A. Mammela, Zhenhong Li
{"title":"Comparison of channel frequency and impulse response estimation for space-time coded OFDM systems","authors":"L. Harjula, A. Mammela, Zhenhong Li","doi":"10.1109/VETECF.2002.1040585","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040585","url":null,"abstract":"Accurate channel state information (CSI) is required at the receiver in a space-time coded OFDM system. In this paper, two channel estimation methods based on least squares (LS) criteria for space-time coded OFDM systems are studied and compared in detail. The channel frequency response estimator uses training sequences that rely on real orthogonal designs for acquisition, while the channel impulse response estimator exploits space-time coded sequence for both acquisition and tracking modes. Computer simulations show that both estimators work well in a Rayleigh flat-fading channel. The performance of the estimators is similar in the acquisition mode if the correlation between the subcarriers is taken into account similarly in both cases.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121460217","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
A space-time coded OFDM with dual Viterbi decoder 具有双维特比解码器的空时编码OFDM
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040732
S. Kang, C. Ko
{"title":"A space-time coded OFDM with dual Viterbi decoder","authors":"S. Kang, C. Ko","doi":"10.1109/VETECF.2002.1040732","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040732","url":null,"abstract":"In this paper, a space-time coded orthogonal frequency division multiplexing (STC-OFDM) scheme with dual Viterbi decoder is proposed and analyzed. In this scheme, two independent half-rate OFDM symbols are generated after convolutional coding. A dual Viterbi decoder is used for the independent decoding of the recovered sequence, and their path metrics are compared. Accordingly, the recovered binary data is a combination of the sequences which have larger path metrics. The proposed STC-OFDM scheme has better performance than the conventional one for all signal-to-noise ratios.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121785901","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
An adaptive parallel interference canceler using adaptive blind arrays 采用自适应盲阵列的自适应并行干扰消除器
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040378
S. N. Nazar, M. Ahmad, M. Swamy, Weiping Zhu
{"title":"An adaptive parallel interference canceler using adaptive blind arrays","authors":"S. N. Nazar, M. Ahmad, M. Swamy, Weiping Zhu","doi":"10.1109/VETECF.2002.1040378","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040378","url":null,"abstract":"The performance of code-division multiple access (CDMA) receivers can be significantly enhanced by employing multiuser detection techniques and antenna arrays. A compromise between the system performance and the computational complexity is obtained by employing parallel interference cancellation due to its simple structure. We propose a technique in which an adaptive parallel interference canceler (APIC) and adaptive blind arrays are combined. The blind algorithm is formulated using a constrained optimization criterion, and the adaptation is carried out using LMS algorithm combined with the gradient-projection algorithm to incorporate the quadratic constraint. Simulation results are presented to show the excellent performance of the proposed structure in comparison with that of using either multiuser detection or smart antennas in a severe near-far situation.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"22 7","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113938388","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
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