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2007 IEEE 66th Vehicular Technology Conference最新文献

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Dynamic Channel Modeling for Static Mobile Terminals in Indoor NLOS Environments 室内NLOS环境下静态移动终端的动态信道建模
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.188
T. Fujii, Y. Ohta
{"title":"Dynamic Channel Modeling for Static Mobile Terminals in Indoor NLOS Environments","authors":"T. Fujii, Y. Ohta","doi":"10.1109/VETECF.2007.188","DOIUrl":"https://doi.org/10.1109/VETECF.2007.188","url":null,"abstract":"More customers are now communicating via cellular phones in indoor environments. In such a situation, the terminals frequently remain static while being used. In order to evaluate the QoS of such terminals, a channel model that takes account of stationary usage is required. This paper proposes a channel model for static terminals used in indoor NLOS environments.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"14 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":"121890430","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: 20
Robust MIMO-OFDM E-SDM Systems With Low Complexity in Time-Varying Indoor Fading Environments 时变室内衰落环境下低复杂度的MIMO-OFDM E-SDM鲁棒系统
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.283
H. Bui, T. Nishimura, H. Nishimoto, T. Ohgane, Y. Ogawa
{"title":"Robust MIMO-OFDM E-SDM Systems With Low Complexity in Time-Varying Indoor Fading Environments","authors":"H. Bui, T. Nishimura, H. Nishimoto, T. Ohgane, Y. Ogawa","doi":"10.1109/VETECF.2007.283","DOIUrl":"https://doi.org/10.1109/VETECF.2007.283","url":null,"abstract":"The performance of MIMO-OFDM E-SDM systems may be seriously degraded in time-varying fading environments due to a channel transition. In the paper, we propose two methods of channel extrapolation to compensate for the channel change. Futhermore, we also consider a method to reduce the amount of header signal and the computational complexity for the systems. We conducted MIMO measurement campaigns at a 5.2 GHz frequency band to evaluate the system performance. Simulation results based on the measured channel data show that robust bit-error rate performance can be obtained by using our channel prediction methods in both line-of-sight (LOS) and non- LOS environments. It is also shown that the method of reducing the amount of header signal and the computational complexity may be used in the practical implementation point of view.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"9 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":"125248106","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
Receiver-Based Compensation of Transmitter-Incurred Nonlinear Distortion in Multiple-Antenna OFDM Systems 多天线OFDM系统中基于接收机的发射机非线性失真补偿
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.288
T. Schenk, C. Dehos, D. Morche, E. Fledderus
{"title":"Receiver-Based Compensation of Transmitter-Incurred Nonlinear Distortion in Multiple-Antenna OFDM Systems","authors":"T. Schenk, C. Dehos, D. Morche, E. Fledderus","doi":"10.1109/VETECF.2007.288","DOIUrl":"https://doi.org/10.1109/VETECF.2007.288","url":null,"abstract":"To enable an efficient implementation of multiple-antenna OFDM systems, this paper proposes an approach to reduce the influence of transmitter-induced nonlinearities in such systems. The approach comprises a preamble design, an estimation method and a digital compensation algorithm. Correction for the nonlinearities of the different transmitter branches is applied in the receiver, which requires no extra hardware. A numerical performance evaluation shows that the proposed approach can successfully be applied with minimal performance degradation compared to non-impaired systems.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"5 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":"125342573","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
Active Queue Management for Reducing Downlink Delays in WiMAX 减少WiMAX下行链路延迟的主动队列管理
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.81
Jani Lakkakorpi, A. Sayenko, Juha Karhula, O. Alanen, Jani Moilanen
{"title":"Active Queue Management for Reducing Downlink Delays in WiMAX","authors":"Jani Lakkakorpi, A. Sayenko, Juha Karhula, O. Alanen, Jani Moilanen","doi":"10.1109/VETECF.2007.81","DOIUrl":"https://doi.org/10.1109/VETECF.2007.81","url":null,"abstract":"In WiMAX networks, the base station (BS) is a likely bottleneck for downlink (DL) TCP connections due to difference in available bandwidth between the fixed network and the wireless link. This may result in buffer overflows or excessive delays at the BS, as these buffers are connection-specific. In order to avoid buffer overflows, different active queue management (AQM) methods may be applied at the BS. This paper presents an analysis of several AQM mechanisms and proves that they are indeed very useful: AQM reduces considerably DL delays at the WiMAX BS without sacrificing TCP goodput.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"11 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":"114604930","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
Non-Isotropic Fading Channel Model for the Highway Environment 公路环境下的非各向同性衰落信道模型
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.450
J. Dulmage, M. Fitz
{"title":"Non-Isotropic Fading Channel Model for the Highway Environment","authors":"J. Dulmage, M. Fitz","doi":"10.1109/VETECF.2007.450","DOIUrl":"https://doi.org/10.1109/VETECF.2007.450","url":null,"abstract":"This paper investigates the properties of several non- Jakes Doppler spectra proposed for the vehicle-to-vehicle non- isotropic scattering environment of the open highway. Expressions for the ideal model correlations, level-crossing rates, and average fade durations are derived. The classic Clarke channel model is modified to generate fading signals corresponding to the non-isotropic scattering profiles. The simulation results match well with the theoretical ideal channel.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"27 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":"115930783","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
Context-Based Communications Dimensioning for Safety Applications in Wireless Vehicular Systems 无线车载系统安全应用中基于上下文的通信尺寸标注
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.454
M. Sepulcre, J. Gozálvez
{"title":"Context-Based Communications Dimensioning for Safety Applications in Wireless Vehicular Systems","authors":"M. Sepulcre, J. Gozálvez","doi":"10.1109/VETECF.2007.454","DOIUrl":"https://doi.org/10.1109/VETECF.2007.454","url":null,"abstract":"The use of wireless vehicular communication systems for traffic safety applications imposes a careful and adequate communications dimensioning to ensure the transmission of broadcast safety messages in a timely manner. To date, several studies have proposed an adaptive dimensioning of the inter- vehicle communication protocols based on the particular operating conditions of the transmitting vehicles. This work complements these initial investigations by proposing and demonstrating the need to dimension such communication protocols not only based on the operating conditions but also on the vehicular context. By modifying the communication parameters based on the presence of nearby vehicles, the proposed context-based communications dimensioning reduces the risk of chain collisions.","PeriodicalId":261917,"journal":{"name":"2007 IEEE 66th Vehicular Technology Conference","volume":"122 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":"128183747","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
Piggybacking Scheme of MAP IE for Minimizing MAC Overhead in the IEEE 802.16e OFDMA Systems 最小化IEEE 802.16e OFDMA系统MAC开销的mapie承载方案
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.73
Juyeop Kim, D. Cho
{"title":"Piggybacking Scheme of MAP IE for Minimizing MAC Overhead in the IEEE 802.16e OFDMA Systems","authors":"Juyeop Kim, D. Cho","doi":"10.1109/VETECF.2007.73","DOIUrl":"https://doi.org/10.1109/VETECF.2007.73","url":null,"abstract":"This paper analyzes Media Access Control(MAC) overhead of the IEEE 802.16e systems and shows that it causes to degrade system performance critically. MAP, a control message about resource allocation, is broadcasted with high robustness and uses a great amount of radio resource for it. This paper also proposes an advanced scheme which transmits MAP IE, a component of MAP, piggybacked on data packets, and uses fast feedback to conserve the transmission reliability of the MAP IE. Then, MAP IEs can be transmitted with high data rate, and the amount of radio resource for transmitting MAP IEs becomes extremely small. Numerical analysis and simulation results show that the proposed scheme can significantly improve the MAC overhead.","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":"129933507","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: 12
Spectral Efficient Frequency Allocation Scheme in Multihop Cellular Network 多跳蜂窝网络中的频谱高效频率分配方案
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.308
Lei Guan, Jian-hua Zhang, Jianing Li, Guangyi Liu, Ping Zhang
{"title":"Spectral Efficient Frequency Allocation Scheme in Multihop Cellular Network","authors":"Lei Guan, Jian-hua Zhang, Jianing Li, Guangyi Liu, Ping Zhang","doi":"10.1109/VETECF.2007.308","DOIUrl":"https://doi.org/10.1109/VETECF.2007.308","url":null,"abstract":"Radio frequency allocation is of great importance in the multihop cellular network, because some extra resources (frequency or time slot) seem to be allocated to the relay station. Generally, the tradeoff must be made between the frequency reuse factor and the inter-cell interferences during establishing frequency allocation scheme. A \"pre-configured and fixed (PreF)\" frequency allocation scheme has been proposed in [1]. In this paper, the concept of \"soft frequency reuse (SFR)\" in [2] is first borrowed, and applied to the multihop cellular network. After that, the improvement is made to the SFR scheme, and a more efficient \"modified SFR (MSFR)\" frequency allocation scheme is proposed. Through the simulations, it is demonstrated that, almost the same cell throughput can be achieved in the PreF and SFR schemes for the uniform traffic distribution, and the MSFR scheme can provide nearly twice cell throughput as large as that in the aforementioned two schemes. Moreover, the SFR and MSFR schemes both outperform the PreF scheme for the non-uniform traffic distribution because of the support to dynamic frequency resource allocation in the proposed schemes.","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":"130751998","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: 28
Cross-Layer Design to Improve Wireless TCP Performance with Link-Layer Adaptation 利用链路层自适应改进无线TCP性能的跨层设计
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.320
Toktam Mahmoodi, V. Friderikos, O. Holland, H. Aghvami
{"title":"Cross-Layer Design to Improve Wireless TCP Performance with Link-Layer Adaptation","authors":"Toktam Mahmoodi, V. Friderikos, O. Holland, H. Aghvami","doi":"10.1109/VETECF.2007.320","DOIUrl":"https://doi.org/10.1109/VETECF.2007.320","url":null,"abstract":"Transmission control protocol (TCP), the almost universally used reliable transport protocol in the Internet, has been engineered to perform well in wired networks where packet loss is mainly due to congestion. TCP throughput, however, degrades over wireless links, which are characterized by a high and greatly varying bit error rate and by intermittent connectivity. Over such wireless links, the performance achieved by TCP can be improved through the use of cross-layer algorithms at the link-level, which interact with the TCP state machine. In this paper, a TCP-aware dynamic ARQ algorithm is therefore proposed, which utilizes TCP timing information to prioritize ARQ packet retransmissions. Numerical investigation of the proposed algorithm demonstrates the performance improvements that can be attained through this approach, in comparison with TCP-agnostic link-layer approaches.","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":"130977729","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: 26
Novel On-Chip Antenna Structures and Frequency Selective Surface (FSS) Approaches for Millimeter Wave Devices 毫米波器件的新型片上天线结构和频率选择表面(FSS)方法
2007 IEEE 66th Vehicular Technology Conference Pub Date : 2007-10-15 DOI: 10.1109/VETECF.2007.431
L. Ragan, A. Hassibi, T. Rappaport, Craig Christianson
{"title":"Novel On-Chip Antenna Structures and Frequency Selective Surface (FSS) Approaches for Millimeter Wave Devices","authors":"L. Ragan, A. Hassibi, T. Rappaport, Craig Christianson","doi":"10.1109/VETECF.2007.431","DOIUrl":"https://doi.org/10.1109/VETECF.2007.431","url":null,"abstract":"This paper presents novel on-chip antenna structures and provides new on-chip circuit concepts that may be implemented as part of standard integrated circuit fabrication processes for wireless integrated circuits of the future. As wavelengths of wireless local area networks (WLANs) and personal area networks (PANs) shrink to millimeter lengths at 60 GHz and above, interconnectivity issues and cost/scale requirements will require these new approaches for built-in on- chip antennas. This paper highlights advancements in both the integrated circuits and microwave technology research communities, and presents a number of promising areas of research. Finally, we describe an experimental probe station that has been developed at The University of Texas for the testing and characterization of novel on-chip antennas and distributed components.","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":"129726960","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: 20
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