发布求助
文献互助 智能选刊 最新文献

1997 IEEE 47th Vehicular Technology Conference. Technology in Motion最新文献

筛选
英文 中文
Wireless access to ATM-networks based on optical microwave generation 基于光微波产生的atm网络无线接入
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.596363
H. Schubert, D. Mampel, K. Iversen
{"title":"Wireless access to ATM-networks based on optical microwave generation","authors":"H. Schubert, D. Mampel, K. Iversen","doi":"10.1109/VETEC.1997.596363","DOIUrl":"https://doi.org/10.1109/VETEC.1997.596363","url":null,"abstract":"In this paper we suggest a novel approach to realize ATM-based mixed wired and wireless access network by optical microwave generation techniques with inherent support of both interface types. The physical principle is explained and an analytical expression describing the transfer behavior under idealized and non-ideal conditions is derived and discussed. As a result we show that all modulation schemes for the wired and wireless channels are possible. Further we turn to practical aspects and demonstrate how to implement mixed wired and wireless access, and finally we point out some realization aspects.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124544668","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
Parallel simulation of dynamic channel assignment 动态信道分配的并行仿真
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605577
R. Boichat, S. Josselin, P. Kuonen, P. Seite, D. Wagner
{"title":"Parallel simulation of dynamic channel assignment","authors":"R. Boichat, S. Josselin, P. Kuonen, P. Seite, D. Wagner","doi":"10.1109/VETEC.1997.605577","DOIUrl":"https://doi.org/10.1109/VETEC.1997.605577","url":null,"abstract":"Future mobile systems will require huge radio network densities. Consequently, frequency planning and network simulation may become a tedious problem due to the large number of events that must be simulated. In this paper, we analyze a dynamic channel assignment algorithm by using a parallel discrete event simulator.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114589914","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
Diversity and equalization in frequency domain a robust and flexible receiver technology for broadband mobile communication systems 频域分集均衡技术是宽带移动通信系统中鲁棒、灵活的接收技术
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600458
Gerhard Kadel, Technologiezentrum Darmstadt, Postfach
{"title":"Diversity and equalization in frequency domain a robust and flexible receiver technology for broadband mobile communication systems","authors":"Gerhard Kadel, Technologiezentrum Darmstadt, Postfach","doi":"10.1109/VETEC.1997.600458","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600458","url":null,"abstract":"A new receiver structure for broadband mobile communication systems is presented. Signals with block oriented single-carrier modulation are processed in frequency domain. By using a combination of diversity and equalization, an excellent receiver performance can be achieved even for time-variant and frequency-selective radio channels.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123677300","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: 56
Influence of multipath fading and mobile unit velocity on the performance of PN tracking in CDMA systems 多径衰落和移动单元速度对CDMA系统PN跟踪性能的影响
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.606016
Harry S. H. Gombachika, O. Tonguz
{"title":"Influence of multipath fading and mobile unit velocity on the performance of PN tracking in CDMA systems","authors":"Harry S. H. Gombachika, O. Tonguz","doi":"10.1109/VETEC.1997.606016","DOIUrl":"https://doi.org/10.1109/VETEC.1997.606016","url":null,"abstract":"Influence of multipath fading and the mobile unit velocity on the performance of the pseudo noise (PN) tracking system is evaluated and the ability of the PN tracking loop to maintain synchronization under different channel multipath conditions and mobile unit velocities is quantified. The approach used in this paper uses the probability that the tracking loop will lose lock-in (P/sub L/) as a measure of performance which is evaluated as a function of multipath spread of the channel (/spl tau//sub d/) and mobile unit velocity. The results show that when /spl tau//sub d/>0.455 chip duration (T/sub c/) the performance of the PN tracking loop degrades substantially; i.e., P/sub L/>10/sup -5/. Similarly, the mobile unit's velocity has an influence on the performance of the PN tracking loop. Results indicate that for constant mobile unit velocity, the velocity affects the rate at which the loop responds to changes in tracking errors due to noise.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"121 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120876992","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: 14
Frequency planning strategies for frequency hopping GSM 跳频GSM的频率规划策略
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605881
F. Kronestedt, M. Frodigh
{"title":"Frequency planning strategies for frequency hopping GSM","authors":"F. Kronestedt, M. Frodigh","doi":"10.1109/VETEC.1997.605881","DOIUrl":"https://doi.org/10.1109/VETEC.1997.605881","url":null,"abstract":"The GSM system has two type of frequency carriers, namely the frequencies that carry the broadcast control channels (BCCH) and the frequencies carrying only traffic channel (TCH). Two basic frequency planning alternatives can be distinguished: one can either divide the available spectrum into two dedicated parts for BCCH and TCH frequencies respectively or use the entire band for both BCCH and TCH frequencies. The goal with this study has been to investigate which one to prefer, from an interference point of view, in a tightly planned frequency hopping system. Simulations of an interference limited system have been performed. The focus is on the downlink performance, i.e. it is assumed that the downlink is the limiting link in the system. The results show that using dedicated frequency bands for the BCCH and TCH is superior in the downlink. The second strategy, using the entire band for both BCCH and TCH frequencies, will suffer from heavy disturbance in the downlink mainly from BCCH transmitters and the gain from power control and discontinuous transmission cannot be fully utilized. Multiple reuse patterns, a frequency planning concept based on the dedicated bands method has also been analysed.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"334 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120880646","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: 11
A robust receiver-based packet combining scheme for wireless data networks 一种用于无线数据网络的鲁棒的基于接收器的分组合并方案
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.596327
A. Daraiseh, C. Baum
{"title":"A robust receiver-based packet combining scheme for wireless data networks","authors":"A. Daraiseh, C. Baum","doi":"10.1109/VETEC.1997.596327","DOIUrl":"https://doi.org/10.1109/VETEC.1997.596327","url":null,"abstract":"The performance of ARQ systems can be improved by combining current and prior transmissions at the receiver. A technique for combining outputs at the receiver in a packet-based wireless system is presented. The technique is analyzed for a mobile channel and a system that employs Reed-Solomon coding and bounded-distance errors-and-erasures decoding. Performance results show that a receiver employing packet combining provides significant gains in throughput and reductions in packet error probability when compared with a receiver that does not employ combining. Useful results and calculations for general (n,k) q-ary block codes have been also established. These results include expressions for the probability of repeating particular decoder errors with successive retransmissions.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128534713","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
Multi-layered underlay overlay frequency planning scheme for cellular networks 蜂窝网络的多层底层叠加频率规划方案
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600537
A. Sathyendran, G. Tunnicliffe, A. Murch
{"title":"Multi-layered underlay overlay frequency planning scheme for cellular networks","authors":"A. Sathyendran, G. Tunnicliffe, A. Murch","doi":"10.1109/VETEC.1997.600537","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600537","url":null,"abstract":"Conventional frequency planning techniques allow only a single frequency reuse factor for the whole system. This reuse factor is determined by the performance of the user at the cell boundary. Consequently this scheme does not take advantage of the higher reception quality of users close to the base station. Underlay overlay (UO) systems that have been proposed for TDMA cellular networks take advantage of the high reception quality of users close to the base station and improve the frequency efficiency of the system. In this paper a multilayered UO system is considered where the layer boundaries are defined by the mean C/I threshold. The analysis presented considers the dimensioning of multilayered UO systems and the frequency efficiency of the UO system is compared with the conventional single layered frequency reuse systems. The analysis shows that the UO system can provide 25-40% and 20-25% improvement in frequency efficiency in GSM and IS-54 TDMA (DAMPS) networks respectively.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128567716","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 spread spectrum PRMA protocol with randomized arrival time over fading channels for microcellular networks 微蜂窝网络衰落信道上随机到达时间扩频PRMA协议
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.605398
Xiao-feng Dong, Le-min Li
{"title":"A spread spectrum PRMA protocol with randomized arrival time over fading channels for microcellular networks","authors":"Xiao-feng Dong, Le-min Li","doi":"10.1109/VETEC.1997.605398","DOIUrl":"https://doi.org/10.1109/VETEC.1997.605398","url":null,"abstract":"A spread spectrum PRMA (SSPRMA) with randomized arrival time is proposed. We analyze its channel utilization, and the probability of voice packet being dropped (Pdrop) by Markov chain analysis. We study the effect of delay capture phenomenon on the performance of this protocol. Packet transmission errors are taken into account in the simulation and the Markov chain analysis. Numerical results prove that delay capture improve the performance of this protocol.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129591591","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
Multiuser diversity receivers for frequency-selective Rayleigh fading CDMA channels 频率选择瑞利衰落CDMA信道的多用户分集接收机
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.596347
Xiaodong Wang, H. Poor
{"title":"Multiuser diversity receivers for frequency-selective Rayleigh fading CDMA channels","authors":"Xiaodong Wang, H. Poor","doi":"10.1109/VETEC.1997.596347","DOIUrl":"https://doi.org/10.1109/VETEC.1997.596347","url":null,"abstract":"Adaptive receiver structures for coherent and differentially coherent multiuser detection with diversity combining in the frequency-selective Rayleigh fading CDMA channels are proposed. The receiver employs a recursive-least-squares (RLS) multipath MMSE filter-bank as the front-end to mitigate the multiple-access interference and the multipath interference. Two suboptimal schemes for joint channel estimation and symbol detection are developed, namely, the decision-directed symbol-by-symbol detection and the per-survivor sequence detection. A differentially coherent detection scheme is also considered. Finally, the performance of these adaptive detectors are assessed by simulations. A salient feature of the adaptive receivers proposed is that their implementations can be mapped to VLSI systolic arrays to exploit massively parallel signal processing computation.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127017124","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
Capacity and trunking efficiency of smart antenna 智能天线的容量和集群效率
1997 IEEE 47th Vehicular Technology Conference. Technology in Motion Pub Date : 1997-05-04 DOI: 10.1109/VETEC.1997.600401
D.J.Y. Lee, Ce Xu
{"title":"Capacity and trunking efficiency of smart antenna","authors":"D.J.Y. Lee, Ce Xu","doi":"10.1109/VETEC.1997.600401","DOIUrl":"https://doi.org/10.1109/VETEC.1997.600401","url":null,"abstract":"The smart antenna is believed to be the solution for a high capacity system. It improves both C/I ratio and trunk efficiency. In this paper, we use a computer simulation to compare the capacity among omni, 3-sector, Lee's micro cell, 6 sector and a 12-antenna switched beam smart antenna. First, the C/I ratios under different pathless exponent and reuse factor are compared within these systems. Then, the trunking efficiencies among these systems are also compared. As the result shows, the smart antenna does support a reasonably good C/I ratio, and the highest trunking efficiency. This simulator is also enhanced to calculate the path loss exponent for specific design areas based on the collected measured data. This path loss exponent then can be used as input to the simulator to simulate the C/I and frequency reuse factor for the area. Measured data were collected in LA. Path loss exponents were calculated using Lee's propagation model. Based on the calculated path loss exponent and the simulator, in a dense urban area, the smart antenna system can support a k=3 reuse scheme.","PeriodicalId":389634,"journal":{"name":"1997 IEEE 47th Vehicular Technology Conference. Technology in Motion","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127404424","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信