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Proceedings IEEE 56th Vehicular Technology Conference最新文献

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Bi-directional route optimization in mobile IP over wireless LAN 无线局域网移动IP双向路由优化
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040788
Chun-Hsin Wu, A. Cheng, Shao-Ting Lee, Jan-Ming Ho, Der-Tsai Lee
{"title":"Bi-directional route optimization in mobile IP over wireless LAN","authors":"Chun-Hsin Wu, A. Cheng, Shao-Ting Lee, Jan-Ming Ho, Der-Tsai Lee","doi":"10.1109/VETECF.2002.1040788","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040788","url":null,"abstract":"We propose to support symmetric bidirectional route optimization in mobile IPv4 considering ingress-filtering routers. We developed subnet-based direct tunneling techniques to improve the routing efficiency for mobile IP and a binding optimization technique to reduce the handoff latency for mobile nodes. An enhanced correspondent agent was introduced to collaborate with the home agent and the foreign agent to support these techniques. Utilizing a tunneling cache, datagrams sent from a mobile node can be directly tunneled to a correspondent agent, including binding update messages. The proposed, approach can maximize the use of a bi-directional tunnel without abandoning the transparency to existing hosts. Learning from our deployment experience, the enhanced mobile IP protocol is suitable for wireless LANs that provide broadband multimedia and location-based services.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"60 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":"122332993","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: 33
Analysis of diversity and multiplexing tradeoff for multi-antenna systems with covariance feedback 协方差反馈多天线系统分集与复用权衡分析
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040723
H. Boche, Eduard Axel Jorswieck
{"title":"Analysis of diversity and multiplexing tradeoff for multi-antenna systems with covariance feedback","authors":"H. Boche, Eduard Axel Jorswieck","doi":"10.1109/VETECF.2002.1040723","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040723","url":null,"abstract":"We study a single-user multi-antenna system with perfect channel state information (CSI) at the receiver and imperfect CSI at the transmitter. The common downlink transmission model is assumed with one or more uncorrelated receive antennas and correlated transmit antennas. Zheng and Tse (see IEEE Transactions on Information Theory, Jan., 2002) discussed the tradeoff between diversity advantage and multiplexing gain for the asymptotic high SNR regime. At low and mid-range SNR values the connection between the multiplexing gain and diversity is not cleared. We extend our results for the optimal power allocation in MISO and MIMO systems with covariance feedback in order to characterize the multiplexing gain in small and mid-range SNR regions. We give analytical results for the case in which the optimal transmit covariance matrix has rank 1 the equivalent to the multiplexing gain. In addition to this, we discuss the outage capacity and its optimization for the MISO and MIMO case. We provide an asymptotic result for the outage probability which enables us to measure the impact of correlation on the outage probability.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"76 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":"122955134","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: 9
Multi-code MAC for multi-hop wireless ad hoc networks 多跳无线自组织网络的多码MAC
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040774
Kyu-Tae Jin, D. Cho
{"title":"Multi-code MAC for multi-hop wireless ad hoc networks","authors":"Kyu-Tae Jin, D. Cho","doi":"10.1109/VETECF.2002.1040774","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040774","url":null,"abstract":"Wireless ad-hoc network consists of wireless mobile terminals forming a temporary network without any deployed infrastructure or centralized administration. The demand for mixed data, audio, and video applications, that is, multimedia services has grown in wireless ad hoc networks. In this paper, we propose the multi-code MAC scheme considering multimedia packets in multi-hop wireless ad hoc networks with flat architecture. The multi-code MAC enhances the pervious multichannel MACs, which simultaneously allocates multiple codes to the sender after the exchange of RTS/CTS/ACK messages through common code. We perform a simulation to evaluate our multi-code MAC in view of throughput and average access delay.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"419 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":"122861082","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: 17
Design of an interference-resistant equalizer for EDGE cellular radio systems EDGE蜂窝无线电系统的抗干扰均衡器设计
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040490
M. Barberis, S. Heinen, P. Guerra
{"title":"Design of an interference-resistant equalizer for EDGE cellular radio systems","authors":"M. Barberis, S. Heinen, P. Guerra","doi":"10.1109/VETECF.2002.1040490","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040490","url":null,"abstract":"An adaptive receiver based on delayed decision feedback sequence estimation (DDFSE) for the EDGE (Enhanced Data Rates for GSM Evolution) system with 8PSK modulation is presented. The issues involved in preconditioning the signal for equalization are discussed, as well as the design of the whitening matched filter (WMF). A special emphasis is placed on a simple structure suitable for implementation, which is robust enough to pass Third Generation Partnership Program (3GPP) standard compliance tests, including co- and adjacent channel requirements. In addition, the optimization of the channel estimate and the computation of soft-output decisions, crucial to optimize the performance of the complete chain are discussed. Results of performance simulations for various coding schemes, propagation channels and environments (reference sensitivity, adjacent channel interference) are presented.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"25 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":"122078495","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
Adaptive radio resource management based on cell load in CDMA-based hierarchical cell structure 基于cdma分层小区结构的小区负荷自适应无线电资源管理
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040638
T. Kwon, D. Cho
{"title":"Adaptive radio resource management based on cell load in CDMA-based hierarchical cell structure","authors":"T. Kwon, D. Cho","doi":"10.1109/VETECF.2002.1040638","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040638","url":null,"abstract":"Since the number of mobile users is continuously growing, we shrink cell size to increase the system capacity. By shrinking the cell size, the handoff rate is increased. To overcome these problems, a hierarchical cell structure is proposed. Because efficient use of radio resources is very important, utilization of all resources have to be maximized. Thus, in a hierarchical cell structure, how to assign available radio resources to each user is critical question. So far, several studies have been made on static radio resource management in a hierarchical cell structure. However, in order to adapt to changes of traffic, it is necessary to consider adaptive radio resource management. Thus, in this study, we propose an adaptive radio resource management in a CDMA based hierarchical cell structure. The performance of the proposed scheme is evaluated by means of computer simulation. The results show that the proposed scheme improves call blocking, call dropping and utilization of radio resource compared with conventional schemes.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"11 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":"117007445","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: 6
Context aware detection of selfish nodes in DSR based ad-hoc networks 基于DSR的自组织网络中自私节点的上下文感知检测
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040656
K. Paul, D. Westhoff
{"title":"Context aware detection of selfish nodes in DSR based ad-hoc networks","authors":"K. Paul, D. Westhoff","doi":"10.1109/VETECF.2002.1040656","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040656","url":null,"abstract":"There can be several sophisticated attacks motivated by selfish, resource saving nature of nodes in a civilian co-operation based ad-hoc network. Distributed rating model based castigation can be useful to discourage selfish nodes from performing these attacks. Even if an attacker is detected, it is hard to charge an accused node in a dynamic environment of an ad-hoc network. In this paper we detect a large range of attacks on dynamic source routing (DSR) protocol and the originator of the attack. We provide a mechanism to inform other nodes of the system about the accused, provide a context aware inference scheme to blame the accused and malicious accuser without doubt. We achieve this with minimal extension of DSR and in a cost effective manner.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"1 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":"129768746","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: 32
Verifying path loss and delay spread predictions of a 3D ray tracing propagation model in urban environment 验证城市环境下三维射线追踪传播模型的路径损失和延迟传播预测
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040665
T. Rautiainen, G. Wölfle, R. Hoppe
{"title":"Verifying path loss and delay spread predictions of a 3D ray tracing propagation model in urban environment","authors":"T. Rautiainen, G. Wölfle, R. Hoppe","doi":"10.1109/VETECF.2002.1040665","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040665","url":null,"abstract":"In this paper path loss and delay spread predictions of a 3D ray tracing software are compared to wideband radio channel measurements made in Helsinki city center. Measurements were carried out in the 2 GHz band by using a wideband radio channel sounder, which gives out complex channel impulse responses. Reference delay spreads were obtained from power delay profiles, and path losses were available after appropriate cable calibration measurements. Comparisons between measurement and propagation predictions were made in cases where a realistic directional BS antenna was placed (a) slightly below the rooftop level and (b) slightly above the rooftop level. For propagation modeling a fully 3D ray optical model was used.","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":"129875121","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: 79
Space-time partially adaptive pre-equalizer for high rate CDMA systems using conjugate gradient technique 基于共轭梯度技术的高速率CDMA系统空时部分自适应预均衡器
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040550
Gau-Joe Lin, Ta-Sung Lee, Chan-Choo Tan
{"title":"Space-time partially adaptive pre-equalizer for high rate CDMA systems using conjugate gradient technique","authors":"Gau-Joe Lin, Ta-Sung Lee, Chan-Choo Tan","doi":"10.1109/VETECF.2002.1040550","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040550","url":null,"abstract":"A novel space-time (ST) pre-equalizer is proposed for the downlink of high data rate CDMA systems over frequency-selective multipath channels. We consider the scenario in which multiple transmit antennas are used at the base station (BS) for downlink transmission, followed by a set of adaptive FIR filters to suppress the multiple access interference (MAI) and possible intersymbol interference (ISI). With the MAI and ISI effectively suppressed, each mobile station (MS) would require only a simple matched filter (MF), leading to a \"thin\" handsets design suitable for next-generation wireless communications. The tap weights of each adaptive FIR filter are determined based on the generalized sidelobe canceller (GSC) technique, and partial adaptivity is incorporated via the conjugate gradient (CG) algorithm for reduced complexity implementation. The proposed ST pre-equalizer is evaluated through simulations, and the results show that it can achieve better performance compared to the pre-RAKE maximum ratio combining (MRC) method.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"2015 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":"128746885","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
Frequency domain pre-equalization with transmit diversity for MISO broadband wireless communications 基于发射分集的MISO宽带无线通信频域预均衡
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040524
R. Choi, R. Murch
{"title":"Frequency domain pre-equalization with transmit diversity for MISO broadband wireless communications","authors":"R. Choi, R. Murch","doi":"10.1109/VETECF.2002.1040524","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040524","url":null,"abstract":"In this paper, we introduce a frequency domain pre-equalization scheme with multiple transmit antennas to combat intersymbol interference (ISI) and fading in the downlink of broadband wireless communications. MIMO processing in the frequency domain is performed at the base station so that the mobile station can have a simplified receiver. The optimal transmit frequency domain coefficient matrix is derived by minimizing the mean square errors (MMSE). Moreover, we derive an expression for the signal to interference-plus-noise ratio (SINR) and error probability based on the Gaussian approximation of the interference term. Improved performance is demonstrated by analysis and simulation results. In particular, it is shown that this pre-equalization scheme can equalize the channel and attain multipath or frequency diversity. Therefore, our proposed scheme can obtain transmit antenna diversity as well as frequency diversity.","PeriodicalId":162055,"journal":{"name":"Proceedings IEEE 56th Vehicular Technology Conference","volume":"7 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":"128287912","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: 33
Performance and modeling of WCDMA/HSDPA transmission/H-ARQ schemes WCDMA/HSDPA传输/H-ARQ方案的性能与建模
Proceedings IEEE 56th Vehicular Technology Conference Pub Date : 2002-12-10 DOI: 10.1109/VETECF.2002.1040388
F. Frederiksen, T. Kolding
{"title":"Performance and modeling of WCDMA/HSDPA transmission/H-ARQ schemes","authors":"F. Frederiksen, T. Kolding","doi":"10.1109/VETECF.2002.1040388","DOIUrl":"https://doi.org/10.1109/VETECF.2002.1040388","url":null,"abstract":"As part of 3GPP Release'5 standardization work on WCDMA/UTRA, a new packet concept has been added to grant high speed downlink packet access (HSDPA). One of the central features of the HSDPA concept is advanced physical layer retransmission scheduling employing soft combining gain, incremental redundancy, and low retransmission delays. Since the average retransmission probability in HSDPA is typically on the order of 10-40%, the retransmission scheduling needs to be accurately simulated and modeled at both link and network level. Based on an extensive simulation campaign, this paper presents methods to map the link level performance of the HSDPA retransmission schemes into a low-complexity representation suitable for network level evaluation. The method accurately predicts the throughput and delay performance within a few percent.","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":"124559081","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: 133
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