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VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)最新文献

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Simultaneous indoor propagation measurements at 17 and 60 GHz for wireless local area networks 同时室内传播测量在17和60 GHz无线局域网
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686626
H. Radi, M. Fiacco, M. Parks, S. Saunders
{"title":"Simultaneous indoor propagation measurements at 17 and 60 GHz for wireless local area networks","authors":"H. Radi, M. Fiacco, M. Parks, S. Saunders","doi":"10.1109/VETEC.1998.686626","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686626","url":null,"abstract":"A study of indoor propagation factors at 17 and 60 GHz is described. A dual narrowband sounder is described, aimed at evaluating the coverage and frequency reuse potential of these bands. A number of different indoor environments are under investigation from office type buildings containing a large number of small rooms, to a large open plan environment containing no internal walls. Also under investigation are the reflection and transmission characteristics of several construction materials at the same frequencies.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115800049","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: 16
Outage probability for a zero forcing multiuser detector with random signature sequences 具有随机签名序列的零强制多用户检测器的中断概率
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686507
S. Manji, N. Mandayam
{"title":"Outage probability for a zero forcing multiuser detector with random signature sequences","authors":"S. Manji, N. Mandayam","doi":"10.1109/VETEC.1998.686507","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686507","url":null,"abstract":"The performance of linear interference suppression in a DS-CDMA (direct-sequence code division multiple access) system using random codes varies over the user-population due to the random set of interfering sequences. As a result, the capacity of such systems depends on the distribution of the interfering signature sequences and consequently the distribution of the signal-to-interference ratio (SIR). For a zero-forcing or decorrelating solution, the SIR can be expressed in terms of the the near-far resistance (NFR) associated with the detector. Using a statistical characterization of the NFR, we derive analytical bounds on the outage probability in such systems. The analysis is based on application of the Wilson-Hilferty approximation of the chi-squared distribution valid on the range 1/spl Lt/K/spl Lt/N where K is the number of users in a cell and N is the processing gain. We show that the cell capacity can be upper and lower bounded by closed form expressions. We compare the cell capacity using zero forcing detection with conventional matched filter detection. Results show a ten fold capacity increase using zero forcing detection in a single cell system and a three fold increase in a multiple cell system.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116191363","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
Convergence analysis and tracking ability of reduced-dimension blind space-time RAKE receivers for DS-CDMA DS-CDMA降维盲空时RAKE接收机的收敛分析与跟踪能力
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686175
Yung-Fang Chen, M. Zoltowski
{"title":"Convergence analysis and tracking ability of reduced-dimension blind space-time RAKE receivers for DS-CDMA","authors":"Yung-Fang Chen, M. Zoltowski","doi":"10.1109/VETEC.1998.686175","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686175","url":null,"abstract":"We previously presented reduced dimension blind space-time RAKE receivers for classical DS-CDMA that cancel strong multi-user access interference while optimally combining the desired user's multipath. We show through theoretical analysis and supporting simulations that if the space and time compressing transformations are designed judiciously, reduced dimension 2D RAKE receivers offer faster convergence with respect to the output SINR as a function of the number of symbols received than that achieved with a full dimension space-time RAKE receiver, at the expense of only a slight loss in asymptotic SINR. Applications to the IS-95 uplink are presented along with supporting simulations. In addition, simulations involving a mobile moving 75 mph are presented demonstrating the tracking capabilities of the reduced dimension 2D RAKE receiver.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121951960","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
Performance of fast forward link power control for CDMA systems CDMA系统的快进链路功率控制性能
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686651
A. Jalali, M. Feeney, A. Chheda
{"title":"Performance of fast forward link power control for CDMA systems","authors":"A. Jalali, M. Feeney, A. Chheda","doi":"10.1109/VETEC.1998.686651","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686651","url":null,"abstract":"Fast power control is being considered on the forward link for the third generation CDMA systems. This paper simulates fast power control on the forward link for a 9600 bps data rate and discusses potential capacity gains. Performance of the fast power control scheme for 800 and 1600 Hz power control update rates are given to determine the potential capacity improvements as the update rate is increased. The paper also discusses some of the issues that need to be considered in designing fast power control for the forward link.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122047259","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
Area spectral efficiency of a channel adaptive cellular mobile radio system in a correlated shadowed environment 相关阴影环境下信道自适应蜂窝移动无线电系统的面积频谱效率
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686405
M. Tariq, A. Nix
{"title":"Area spectral efficiency of a channel adaptive cellular mobile radio system in a correlated shadowed environment","authors":"M. Tariq, A. Nix","doi":"10.1109/VETEC.1998.686405","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686405","url":null,"abstract":"In this paper, the average area spectral efficiency (ASE) in bits/sec/Hz/Km/sup 2/ of a variable transmission rate, high capacity cellular communication system is studied in a correlated shadowed environment. The effect on average ASE of the normalised reuse distance, shadowing variance, correlation between radio signals, coverage radius and cell sectorization is investigated by computer simulations. It is shown mathematically that the average ASE of an interference limited mobile radio channel increases with the increased shadowing variance. Downlink simulation results indicate that, the increase in shadowing correlation between the desired and the sum of the undesired signals reduces the average ASE whereas mutual correlation between individual interfering signals increases the average ASE. The variation of cell size on average ASE is also investigated. The results suggest small cell sizes in heavily shadowed areas are well suited for high-speed variable data rate transmissions.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122144065","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: 5
Measurement of rotation effects in an indoor infrared channel 室内红外通道旋转效应的测量
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686128
Mohammadreza Pakravan, M. Kavehrad, H. Hashemi
{"title":"Measurement of rotation effects in an indoor infrared channel","authors":"Mohammadreza Pakravan, M. Kavehrad, H. Hashemi","doi":"10.1109/VETEC.1998.686128","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686128","url":null,"abstract":"In this paper, we report on a set of measurements performed at University of Ottawa to investigate the effects of rotation on the parameters of the indoor infrared channel model. The infrared channel is characterized by measuring the amplitude and phase response of its transfer function. The measurements have been performed in rooms with different shapes and physical properties. In each position, the receiver is rotated in steps of 5/spl deg/ and the channel transfer function is recorded in each step. Also, in each position, this set of results is collected for both diffuse and line-of-sight (LOS) configurations. Measurements are done in 9 rooms and a total of more than 5000 frequency responses have been collected. In this paper, we elaborate on the measurement set up, measurement procedures and present some of the results.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125987499","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: 5
Automatic location identification using a hybrid technique 使用混合技术的自动位置识别
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686576
G. Yost, S. Panchapakesan
{"title":"Automatic location identification using a hybrid technique","authors":"G. Yost, S. Panchapakesan","doi":"10.1109/VETEC.1998.686576","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686576","url":null,"abstract":"Automatic location indication (ALI) has been mandated by the US Federal Communications Commission (FCC) for the use of Public Safety Answering Points (PSAPs) and other users, by late 2001. We analyze a hybrid approach which uses combination of time difference of arrival (TDOA) and independent time of arrival (TOA) information to supplement each other. Both pieces of information are available with no hardware modifications to currently-available handsets and relatively inexpensive alterations to the base station system. We obtain significantly reduced statistical errors compared with either technique separately. This reduction may be necessary for compliance with the FCC requirement. In addition, there is expected to be a reduction in the measurement bias. The technique has particular advantages in the large areas on the periphery of the central coverage regions.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128459681","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
An air interface for high bandwidth cellular digital communications on microwave frequencies 用于微波频率上的高带宽蜂窝式数字通信的空中接口
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686492
J. Bakker, F. Schoute, R. Prasad
{"title":"An air interface for high bandwidth cellular digital communications on microwave frequencies","authors":"J. Bakker, F. Schoute, R. Prasad","doi":"10.1109/VETEC.1998.686492","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686492","url":null,"abstract":"An air interface for use in high throughput digital cellular networks is presented. The design of the interface is one of the contributions to the multidisciplinary Mobile Multimedia Communications (MMC) project at Delft University of Technology. The targets include 155 Megabit per second sustained throughput for high-level users, support for inexpensive mobile stations and support for the Internet protocol (IP), as well as an option for asynchronous transfer mode (ATM). The design consists of an hierarchical frame structure that employs a combination of frequency division multiplexing (FDM) and time division multiplexing (TDM). A comparison is made with the published results of two other research projects, namely MBS (Mobile Broadband Systems) and Median. A protocol is presented that allows transport of control information and data over this link. This protocol features automatic repeat request (ARQ), support for multiple qualities of service (QoS) and graceful degradation of service quality when the load becomes higher than the capacity. A detailed description of the implementation is given.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129827052","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
A comparative study of ray tracing and FDTD for indoor propagation modeling 光线追踪与时域有限差分法在室内传播建模中的比较研究
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.683705
K. A. Remley, A. Weisshaar, H. R. Anderson
{"title":"A comparative study of ray tracing and FDTD for indoor propagation modeling","authors":"K. A. Remley, A. Weisshaar, H. R. Anderson","doi":"10.1109/VETEC.1998.683705","DOIUrl":"https://doi.org/10.1109/VETEC.1998.683705","url":null,"abstract":"Ray tracing is a high frequency approximation used for site-specific propagation modeling. In the high frequency approximation, the effect of the individual scattering elements on a body or collection of bodies are considered independently. However, as the scatterer size approaches the wavelength of operation, some of the assumptions in the high frequency approximation become invalid. A numerical experiment designed to show the dependence of the ray tracing method on the feature size is presented. Comparison is made between a full-wave, 3-D electromagnetic simulation provided by the finite difference time domain (FDTD) method and a simulation based on ray tracing. Simulation results are presented and the consequences of the information obtained from these experiments are discussed.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123723002","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
Dynamic wideband measurement of mobile radio channel with adaptive antennas 基于自适应天线的移动无线信道动态宽带测量
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686465
K. Kalliola, P. Vainikainen
{"title":"Dynamic wideband measurement of mobile radio channel with adaptive antennas","authors":"K. Kalliola, P. Vainikainen","doi":"10.1109/VETEC.1998.686465","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686465","url":null,"abstract":"This paper presents dynamic radio channel measurement using a fast wideband complex radio channel sounder and an antenna array. Examples of continuous channels of a moving mobile are presented. The array reception allows the investigation of channel dispersion in both angle and time. In addition, wideband measurement gives information of the coherence bandwidth of the 2D channel, essential for downlink beamforming in FDD systems. Also correlation between the elements in the array is studied.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130781789","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
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