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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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Performance evaluation of dipole and microstrip antenna for a GSM microcell base station GSM微蜂窝基站偶极子和微带天线的性能评价
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686100
J. De Kraker, R. van Muijen, M. Hajian, L. Ligthart, R. Prasad
{"title":"Performance evaluation of dipole and microstrip antenna for a GSM microcell base station","authors":"J. De Kraker, R. van Muijen, M. Hajian, L. Ligthart, R. Prasad","doi":"10.1109/VETEC.1998.686100","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686100","url":null,"abstract":"This paper presents the analysis of two miniature antennas, namely a dipole and microstrip antenna, which can be used in a GSM 900 MHz system. The performance of the antennas, a vertical dipole and microstrip antenna, is evaluated by calculating and measuring the average field strength in the coverage area. The image theory and the two-slope propagation model are used to calculate the field strength. The received average field strength for a vertical dipole prototype and a microstrip prototype is measured as a function of distance to the microcell antenna and position to the walls. It is concluded that the vertical dipole antenna with polarisation parallel to the mounting wall has the best performance to obtain canyon street coverage.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"3 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":"130252133","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-channel packet resource allocation for multimedia support 多媒体支持的多通道分组资源分配
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686060
An Mei Chen, R. Rao
{"title":"Multi-channel packet resource allocation for multimedia support","authors":"An Mei Chen, R. Rao","doi":"10.1109/VETEC.1998.686060","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686060","url":null,"abstract":"In a wireless packet network that supports an integrated mix of multimedia traffic, a large variety of mobiles with different service rates will need to be accommodated efficiently in an unified bandwidth-on-demand manner. We have proposed a robust resource allocation protocol to utilize the multiple parallel packet channels to support mixes of multirate traffic. The protocol incorporates a spectrally efficient accessing scheme and across-cell resource sharing technique to effectively multiplex multi-rate packet transmission. The protocol simplifies the network setup and system operation and at the same time reduce the system call blocking and dropping probabilities for all different rate classes of mobiles and has very high channel utilization efficiency. In this paper, we study the effectiveness of the protocol when the channel is subject to Rayleigh fading. We study a scenario when the mobile is downloading a number of media objects and compare the delay performance with the single packet channel. Analytical results indicate that the performance of the protocol is highly dependent on the Doppler frequency and the fading margin and significant gain in the system performance can be achieved for a given set of channel conditions and Doppler frequencies.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"11 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":"134440718","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
Successive cancellation of adjacent channel signals in FDMA/TDMA digital mobile radio systems FDMA/TDMA数字移动无线电系统中相邻信道信号的连续消去
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686050
H. Arslan, S.C. Gupta, G. Bottomley, S. Chennakeshu
{"title":"Successive cancellation of adjacent channel signals in FDMA/TDMA digital mobile radio systems","authors":"H. Arslan, S.C. Gupta, G. Bottomley, S. Chennakeshu","doi":"10.1109/VETEC.1998.686050","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686050","url":null,"abstract":"Capacity and signal quality can be improved in mobile radio systems by designing digital receivers with interference mitigation capability. In this paper, coherent MLSE receivers based on successive cancellation of adjacent channel interference in FDMA/TDMA mobile radio systems are developed. The proposed technique requires estimation of impulse response of the desired and adjacent channels, these are obtained via a novel approach employing pulse shaping information and band extrapolation. The receiver is simulated for the GSM digital cellular system under Rayleigh and Rician fading. The results show substantial improvements in bit error rate in interference limited environments.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"3 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":"130786659","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
The Jakes fading model incorporating angular spread for a disk of scatterers 包含散射体盘的角扩展的Jakes衰落模型
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686622
T. Fulghum, K. Molnar
{"title":"The Jakes fading model incorporating angular spread for a disk of scatterers","authors":"T. Fulghum, K. Molnar","doi":"10.1109/VETEC.1998.686622","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686622","url":null,"abstract":"The effect of angular spread and nominal angle of arrival on the spatial correlation of fading waveforms is reviewed. A new method based on the Jakes model is presented which generates a group of M waveforms for a linear array of M antennas, where the waveforms are appropriately correlated with each other with direct consideration of the nominal arrival angle and angle spread of the scattered signal due to a uniform disk of scatterers about the mobile transmitter.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"6 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":"133544057","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: 60
Multicarrier modulation for advanced messaging systems 高级信息系统的多载波调制
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686155
P. Okrah, M. Newhouse, G. Stuck
{"title":"Multicarrier modulation for advanced messaging systems","authors":"P. Okrah, M. Newhouse, G. Stuck","doi":"10.1109/VETEC.1998.686155","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686155","url":null,"abstract":"This paper proposes the use of multicarrier modulation (MCM) based on IFFT/FFT (Fourier transform) transmitter and receiver pair as a method of implementation for advanced messaging systems. This includes one-way paging, and two-way messaging systems. The proposed MCM system provides immunity against multipath fading distortion. It also provides immunity against intersymbol interference (ISI) caused by long delays spreads that usually occur in simulcast systems. In addition, the MCM system achieves a high quality transmission with good spectral efficiency, better than current messaging systems.","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":"133558595","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
Analysis of wideband propagation characteristics for the high transmission rate in indoor radio channels 高传输速率的室内无线信道宽带传播特性分析
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686583
Hee-Chang Jung, Jin-Dam Mok, Deock-Ho Ha
{"title":"Analysis of wideband propagation characteristics for the high transmission rate in indoor radio channels","authors":"Hee-Chang Jung, Jin-Dam Mok, Deock-Ho Ha","doi":"10.1109/VETEC.1998.686583","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686583","url":null,"abstract":"In this paper, the wideband propagation characteristics were analyzed by the frequency sweeping method. In order to investigate the possibility of a high transmission rate in indoor radio channels, we adopted a circularly polarized antenna in the indoor field tests under line-of-sight (LOS) and non-line-of-sight (NLOS) environments. We analyzed the effects of both human motions and transmission antenna heights. From the indoor field tests, it was found that amplitude deviation within the frequency bandwidth should be improved by circularly polarized waves under LOS conditions, due to removing the reflected wave with an odd number. Also it has been found that there exists an improvement of the amplitude deviation with polarization diversity reception under an NLOS environment. In addition, for the case where the transmission antenna height is changed up to the ceiling height, it has been found that there should be improvement of the wideband amplitude deviation for the high speed transmission system, using polarization diversity.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"75 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":"132676980","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
Adaptive multi-rate multi-code CDMA systems 自适应多速率多码CDMA系统
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.683688
H. Schotten, H. Elders-Boll, A. Busboom
{"title":"Adaptive multi-rate multi-code CDMA systems","authors":"H. Schotten, H. Elders-Boll, A. Busboom","doi":"10.1109/VETEC.1998.683688","DOIUrl":"https://doi.org/10.1109/VETEC.1998.683688","url":null,"abstract":"To support variable data-rates multi-code code-division multiple-access (MC-CDMA) systems have been proposed for mobile communications. They allow the support of variable source data-rates by variation of the set of spreading-sequences assigned to each user. The impact of the sequence-design on the system performance is considered. For the antifading capability and the multiuser interference performance measures are derived. We describe sequence-sets which are almost optimum with respect to these parameters and which allow each user to change its data-rate without affecting the other users.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"290 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":"133104960","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
Performance comparison of multi-stage SIC and limited tree-search detection in CDMA CDMA中多级SIC与有限树搜索检测的性能比较
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686077
T. Oyama, Sumei Sun, H. Sugimoto, Teng Joon Lim, L. Rasmussen, Y. Matsumoto
{"title":"Performance comparison of multi-stage SIC and limited tree-search detection in CDMA","authors":"T. Oyama, Sumei Sun, H. Sugimoto, Teng Joon Lim, L. Rasmussen, Y. Matsumoto","doi":"10.1109/VETEC.1998.686077","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686077","url":null,"abstract":"A rich array of detector structures for CDMA, offering a multitude of trade-offs between performance and complexity have been proposed. In this paper we consider two detector structures that are based on very different principles but represent a similar level of detection complexity. Through simulations the performance of multi-stage successive interference cancellation schemes with either a hard-decision or a clipped soft-decision limiter are compared to similar complexity limited tree-search detectors. The performance is evaluated over single-path and multipath channels.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"199 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":"133173072","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
CDMA dynamic cell configuration scheme for voice/data integrated traffic 用于话音/数据综合流量的CDMA动态小区配置方案
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686443
K. Takeo, S. Sato
{"title":"CDMA dynamic cell configuration scheme for voice/data integrated traffic","authors":"K. Takeo, S. Sato","doi":"10.1109/VETEC.1998.686443","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686443","url":null,"abstract":"One way of accommodating integrated traffic having various transmission rates is to use a multi-code transmission in CDMA mobile communications systems. The simultaneous transmission of multiple signals, however, increases call blocking and degrades communications quality. We previously proposed a dynamic cell configuration (DCC) scheme for reducing the adverse effects of non-uniform traffic in CDMA systems. In the present study, we evaluated the DCC performance for environments in which voice/data integrated traffic is flowing using multi-code transmission. It is shown that the use of DCC reduces call blocking probability and improves communications quality for data-users as well as voice-users.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"8 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":"128844375","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
Performance estimation of prioritized queueing handoff scheme in CDMA cellular system CDMA蜂窝系统中优先排队切换方案的性能估计
VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151) Pub Date : 1998-05-18 DOI: 10.1109/VETEC.1998.686400
Dong Myung Lee, D. Son
{"title":"Performance estimation of prioritized queueing handoff scheme in CDMA cellular system","authors":"Dong Myung Lee, D. Son","doi":"10.1109/VETEC.1998.686400","DOIUrl":"https://doi.org/10.1109/VETEC.1998.686400","url":null,"abstract":"In this paper, a prioritized queueing handoff scheme in the code division multiple access (CDMA) cellular system is proposed and analyzed. The performance of the proposed scheme is evaluated by computer simulation, and it is compared with that of the nonprioritized call handling and first-in first-out (FIFO) queueing disciplines. A channel must be granted to the handoff request before the power received by the mobile station (MS) reaches the \"receiver threshold\", i.e., the threshold in the received power for successful handoff. The handoff threshold and the receiver threshold in the CDMA cellular system are defined as respectively: (1) the pilot strength at the time that the pilot strength measurement message (PSMM) (T ADD) from the MS is received to the base station (BS) of a neighbor cell; and (2) the T DROP timer is expired and the pilot strength at the time that the PSMM (T DROP) from the MS is received to the BS of the current cell.","PeriodicalId":335954,"journal":{"name":"VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)","volume":"9 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":"127814788","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
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