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Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)最新文献

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A Kalman tracker with a turning acceleration estimator for maneuvering target tracking 一种带转向加速度估计的卡尔曼跟踪器用于机动目标跟踪
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-12-01 DOI: 10.1109/VETECF.1999.797299
T. Kawase, H. Tsurunsono, N. Ehara, I. Sasase
{"title":"A Kalman tracker with a turning acceleration estimator for maneuvering target tracking","authors":"T. Kawase, H. Tsurunsono, N. Ehara, I. Sasase","doi":"10.1109/VETECF.1999.797299","DOIUrl":"https://doi.org/10.1109/VETECF.1999.797299","url":null,"abstract":"A Kalman filter based scheme is proposed for radar maneuvering target tracking. The proposed scheme estimates the target acceleration input vector directly from the feature of maneuvering target trajectories and updates the simple Kalman tracker by the acceleration estimates. The proposed acceleration estimator provides better maneuver-following capability than an input estimator which uses residues of the Kalman filter. Simulation results for various target profiles are included for a comparison of the performance of our proposed scheme with that of conventional trackers.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124265495","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
Performance of dynamic channel assignment methods in cellular systems using beam tilting and adaptive array 基于波束倾斜和自适应阵列的蜂窝系统动态信道分配方法的性能
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-11-26 DOI: 10.1109/VETECF.1999.797306
S. Harano, Y. Akaiwa, J. Uchibori
{"title":"Performance of dynamic channel assignment methods in cellular systems using beam tilting and adaptive array","authors":"S. Harano, Y. Akaiwa, J. Uchibori","doi":"10.1109/VETECF.1999.797306","DOIUrl":"https://doi.org/10.1109/VETECF.1999.797306","url":null,"abstract":"Beam tilting and adaptive array are known as antenna techniques to increase frequency utilization efficiency in cellular systems. In this paper, we evaluate performance of some dynamic channel assignment methods in cellular systems using beam tilting and an adaptive array at base stations. The evaluated dynamic channel assignment methods are channel segregation, ARP (autonomous reuse partitioning), SORP (self-organized reuse partitioning) and a current method in PHS (CMP). We evaluate the performance according to the number of wireline circuits at a base station. Computer simulation results show that beam tilting and adaptive array improve interference rate performance regardless of the number of wireline circuits at a base station, and improve blocking rate performance in the case where a base station has many wireline circuits.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132096153","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
Selection policies for queued new calls in cluster-based micro/picocellular wireless networks 基于集群的微/微蜂窝无线网络中排队新呼叫的选择策略
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-22 DOI: 10.1109/VETECF.1999.797187
Hwa-Chun Lin, Show-Shiow Tzeng
{"title":"Selection policies for queued new calls in cluster-based micro/picocellular wireless networks","authors":"Hwa-Chun Lin, Show-Shiow Tzeng","doi":"10.1109/VETECF.1999.797187","DOIUrl":"https://doi.org/10.1109/VETECF.1999.797187","url":null,"abstract":"Micro/picocellular architectures for wireless networks have been proposed to provide higher capacity under limited radio spectrum. With smaller cell size, the frequency of hand-off events will increase. This will in turn increase the overheads for processing hand-off events. To reduce the overheads due to frequent hand-off, a cell-cluster concept has been proposed previously. In this paper, we considered cluster-based micro/picocellular wireless networks with new call queueing. Two selection policies, namely, random and maximum-free-channels policies, were proposed for selection of queued new calls. The selection policy is part of the call admission policy. The performance of the selection policies were studied by extensive simulations. Our results show that the maximum-free-channels policy has significantly better performance (in terms of hand-off dropping probability) than the random policy when the average number of occupied channels in a cluster is greater than the admission threshold.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126288277","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
Security issues in Internet protocols over satellite links 卫星链路上互联网协议的安全问题
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.800282
G. Noubir, L. Von Allmen
{"title":"Security issues in Internet protocols over satellite links","authors":"G. Noubir, L. Von Allmen","doi":"10.1109/VETECF.1999.800282","DOIUrl":"https://doi.org/10.1109/VETECF.1999.800282","url":null,"abstract":"Security is an important issue in IP over satellite, since an attacker can easily intercept such communication and can even corrupt the transmitted data. In the first part of the paper we address the implications of optimizing the transport control protocol (TCP) on the security services provided by the IPSec protocol suite. We provide a set of rules for optimizing TCP without interfering with IPsec. In the second part of the paper, we address IP multicast security issues. We also introduce an efficient key distribution algorithm that can handle a large dynamic group.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123116933","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
Combined coding and successive interference cancellation with random interleaving for DS/CDMA communications DS/CDMA通信中随机交织的组合编码和连续干扰消除
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.801712
Wong Tak Sang, K. B. Letaief, R. Cheng
{"title":"Combined coding and successive interference cancellation with random interleaving for DS/CDMA communications","authors":"Wong Tak Sang, K. B. Letaief, R. Cheng","doi":"10.1109/VETECF.1999.801712","DOIUrl":"https://doi.org/10.1109/VETECF.1999.801712","url":null,"abstract":"The next-generation wireless communication systems are expected to support a broad range of services including communication, information, multimedia and entertainment. In order to meet the increasing demand in capacity and achieve multirate services in the 3G wireless communication systems, wideband code division mltiple access (CDMA) has emerged as the main candidate under consideration. However, because of its inherent multiple access interference, the performance of CDMA can be severely degraded as the number of subscribers increases. Multiuser detection is a scheme which jointly detects all users' signals and by doing so can offer significant system performance improvement. This paper investigates and analyzes the performance of multiuser successive interference cancellation in a coded wideband DS/CDMA communication system. Specifically, a new multistage interference cancellation method is presented which employs a combined coding, successive interference cancellation and random interleaving. Simulation results demonstrate that the proposed scheme can significantly increase the system capacity and performance.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124929092","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
A comparison of time and frequency synchronisation algorithms for the European DVB-T system 欧洲DVB-T系统时间和频率同步算法的比较
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798415
J. Echavarri, M. Woodward, S. Barton
{"title":"A comparison of time and frequency synchronisation algorithms for the European DVB-T system","authors":"J. Echavarri, M. Woodward, S. Barton","doi":"10.1109/VETECF.1999.798415","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798415","url":null,"abstract":"In this paper a comparison of several time and frequency synchronisation algorithms for DVB-T is presented. The goal is to achieve a carrier frequency estimate with an error smaller than 1% of the subcarrier spacing and a timing estimate that avoids ISI in the receiver. Three joint coarse timing and fine frequency estimation algorithms are compared, where the results for the simplest one are similar to the ones for the others with more hardware complexity. The best results for coarse carrier frequency offset are obtained with a data-aided (DA) scheme using the fixed pilot tones. A new method is derived for fine timing estimation for one-path channels. Simulations have been performed for the DVB-T 2K system in three different channels.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125066745","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: 13
Performance analysis of an ISMA CDMA packet data network ISMA CDMA分组数据网络的性能分析
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.800310
J. Pérez-Romero, R. Agustí, O. Sallent
{"title":"Performance analysis of an ISMA CDMA packet data network","authors":"J. Pérez-Romero, R. Agustí, O. Sallent","doi":"10.1109/VETECF.1999.800310","DOIUrl":"https://doi.org/10.1109/VETECF.1999.800310","url":null,"abstract":"The efficiency of MAC protocols for a packet switching DS-CDMA network strongly depends on the offered traffic statistic. For bursty sources where transmission needs are restricted to short message lengths, a protocol such as S-ALOHA can be efficient. However, for longer messages, a reduction in the randomness is required in order to improve the system performance. This improvement can be provided by a protocol such as ISMA when combined with the DS-CDMA technique. In this paper an analytical approach to modeling the resulting ISMA CDMA scheme is presented, and some design issues regarding the number of codes to be used are presented.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123715504","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: 8
A modified adaptive hybrid FEC/ARQ protocol using turbo codes with incremental redundancy transmission 一种改进的自适应混合FEC/ARQ协议，采用增量冗余传输的turbo码
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.801581
Chi-Fai Law, Chi Hang Lau, Tsz-Mei Ko
{"title":"A modified adaptive hybrid FEC/ARQ protocol using turbo codes with incremental redundancy transmission","authors":"Chi-Fai Law, Chi Hang Lau, Tsz-Mei Ko","doi":"10.1109/VETECF.1999.801581","DOIUrl":"https://doi.org/10.1109/VETECF.1999.801581","url":null,"abstract":"In a wireless environment, an FEC or ARQ scheme may be insufficient to achieve the desired performance due to the time-varying nature of the channel. In this paper, we propose a modified adaptive hybrid FEC/ARQ scheme using turbo codes with incremental redundancy. If retransmission is requested, information bits with magnitude of log-likelihood values smaller than the threshold are retransmitted together with the extra parities. In the iterative decoding of packets with extra parities, the decoder is designed to utilize the soft outputs generated from the previous decoding process. Simulation results reveal that the proposed scheme outperforms the traditional schemes under different channel conditions.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125538278","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
Inverted-F antenna with parasitic elements for TETRA handset TETRA手机用带寄生元件的倒f天线
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.801731
J. de Mingo, A. Valdovinos, F. Gutiérrez, J. M. González
{"title":"Inverted-F antenna with parasitic elements for TETRA handset","authors":"J. de Mingo, A. Valdovinos, F. Gutiérrez, J. M. González","doi":"10.1109/VETECF.1999.801731","DOIUrl":"https://doi.org/10.1109/VETECF.1999.801731","url":null,"abstract":"The paper presents the VSWR (voltage standing wave ratio) performance and radiation pattern for a low-profile IFA (inverted-F antenna) matched at 450 MHz. It is known that when the IFA height from a conducting ground plane is approximately one-tenth of the wavelength, the frequency bandwidth for a VSWR=2 criterion is approximately 8%. Nakano et al. (1998) proposed two L-figured parasitic elements added to the IFA to widen the VSWR bandwidth. It should be a large value for handset systems if this criterion is applied to structures working at lower frequencies (450 MHz) such as TETRA. A design of IFA is presented with different lengths for parasitic elements to generate two resonance frequencies near the central frequency of design. Antenna characteristics; mounted on the handset, are calculated using the method of moments (MoM) with wire grid models using numerical electromagnetic code NEC2. The mean effective gain (MEG) for different statistical distribution models of incident waves are presented too.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115185055","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
Performance of a novel self-organization protocol for wireless ad-hoc sensor networks 一种新型无线自组织传感器网络自组织协议的性能
Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324) Pub Date : 1999-09-19 DOI: 10.1109/VETECF.1999.798631
K. Sohrabi, G. Pottie
{"title":"Performance of a novel self-organization protocol for wireless ad-hoc sensor networks","authors":"K. Sohrabi, G. Pottie","doi":"10.1109/VETECF.1999.798631","DOIUrl":"https://doi.org/10.1109/VETECF.1999.798631","url":null,"abstract":"The paper presents an ad-hoc architecture for wireless sensor networks and other wireless systems similar to them. In this class of wireless system the physical resource at premium is energy. Bandwidth available to the system is in excess of system requirements. The approach to solve the problem of ad-hoc network formation here is to use available bandwidth in order to save energy. The method introduced solves the problem of connecting an ad-hoc network. This algorithm gives procedures for the joint formation of a time schedule (similar to a TDMA schedule) and activation of links therein for random network topologies. This self-organization method is energy-sensitive, distributed, scalable, and able to form a connected network rapidly.","PeriodicalId":355729,"journal":{"name":"Gateway to 21st Century Communications Village. VTC 1999-Fall. IEEE VTS 50th Vehicular Technology Conference (Cat. No.99CH36324)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115997418","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: 238
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