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1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest最新文献

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Technology and production of HBT epitaxial material HBT外延材料的技术与生产
1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest Pub Date : 1997-02-23 DOI: 10.1109/MTTTWA.1997.595126
D. Streit, A. Oki, T. Block, D. Lammert, M. Hoppe, D. Umemoto, M. Wojtowicz
{"title":"Technology and production of HBT epitaxial material","authors":"D. Streit, A. Oki, T. Block, D. Lammert, M. Hoppe, D. Umemoto, M. Wojtowicz","doi":"10.1109/MTTTWA.1997.595126","DOIUrl":"https://doi.org/10.1109/MTTTWA.1997.595126","url":null,"abstract":"We report sustained high-yield, high-volume production of HBT epitaxial material and devices for commercial applications. We also report the use of nondestructive material characterization to predict the performance of the fabricated devices.","PeriodicalId":264044,"journal":{"name":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124532949","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
Study of scattering of radiowaves from randomly located vertical wall using compensation theorem approach 用补偿定理方法研究随机位置垂直壁面的无线电波散射
1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest Pub Date : 1997-02-23 DOI: 10.1109/MTTTWA.1997.595123
A. Roberts, Yun Hee Lee
{"title":"Study of scattering of radiowaves from randomly located vertical wall using compensation theorem approach","authors":"A. Roberts, Yun Hee Lee","doi":"10.1109/MTTTWA.1997.595123","DOIUrl":"https://doi.org/10.1109/MTTTWA.1997.595123","url":null,"abstract":"A propagation model for microcellular communication is presented based on the compensation theorem. Simple expressions are derived for the field scattered by a plain dielectric wall using the Fresnel approximation with special attention paid to the stationary phase point. This way the same expression can be used for reflection and diffraction calculations. Using a polynomial approximation a simplified expression for the scattered field is derived, which is used to study the scattering of radiowaves from randomly located vertical wall(s). Good agreement is obtained between our theoretical study and experimental data.","PeriodicalId":264044,"journal":{"name":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125875889","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
Commercial deployment of LMCS systems in the Canadian marketplace LMCS系统在加拿大市场的商业部署
1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest Pub Date : 1997-02-23 DOI: 10.1109/MTTTWA.1997.595100
M. Marshall
{"title":"Commercial deployment of LMCS systems in the Canadian marketplace","authors":"M. Marshall","doi":"10.1109/MTTTWA.1997.595100","DOIUrl":"https://doi.org/10.1109/MTTTWA.1997.595100","url":null,"abstract":"Summary form only given, as follows. The Canadian government has awarded spectrum licenses to three operators in the Canadian market. These operators anticipate deployment of their LMCS architecture in the latter half of 1997. These systems will deliver a variety of interactive services to residential and business users. This paper discusses the challenges that these operators face for the successful deployment of this relatively new technology.","PeriodicalId":264044,"journal":{"name":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124120216","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
A new empirical large signal model for silicon RF LDMOS FETs 硅射频LDMOS场效应管的新经验大信号模型
1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest Pub Date : 1997-02-23 DOI: 10.1109/MTTTWA.1997.595103
Monte Miller, Triet Dinh, E. Shumate
{"title":"A new empirical large signal model for silicon RF LDMOS FETs","authors":"Monte Miller, Triet Dinh, E. Shumate","doi":"10.1109/MTTTWA.1997.595103","DOIUrl":"https://doi.org/10.1109/MTTTWA.1997.595103","url":null,"abstract":"A new empirical large signal drain current source model, that is single-piece and continuously differentiable, has been developed for silicon LDMOS transistors. The new model is capable of accurately representing the current-voltage characteristics and their derivatives. A single continuously differentiable form models the subthreshold, triode, and saturation regions of operation. The model was implemented in a commercial harmonic balance simulator and parameter extraction software. Measured and simulated load-pull results at a class AB operating point are compared and show very good agreement.","PeriodicalId":264044,"journal":{"name":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123360686","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
Code selection for low complexity receivers in multi-carrier code division multiple access systems 多载波码分多址系统中低复杂度接收机的码选择
1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest Pub Date : 1997-02-23 DOI: 10.1109/MTTTWA.1997.595113
L. Freiberg, V. Bhargava
{"title":"Code selection for low complexity receivers in multi-carrier code division multiple access systems","authors":"L. Freiberg, V. Bhargava","doi":"10.1109/MTTTWA.1997.595113","DOIUrl":"https://doi.org/10.1109/MTTTWA.1997.595113","url":null,"abstract":"Future multimedia wireless communications systems will require higher spectral efficiencies, with decreased receiver complexity. MC-CDMA systems can increase spectral efficiency when employing the proper spreading code. Short codes can be used in MC-CDMA, since a high processing gain is not required. Short codes allow the use of maximum likelihood detection, thereby providing a simple form of multi-user detection. In contrast, correlation receivers are also feasible, since orthogonal codes are possible in an MC-CDMA structure. Correlation receivers offer low complexity for long code lengths, allowing an increase in frequency diversity. We emphasise the benefits of orthogonal codes for correlation detectors because of their effectiveness in reducing the crest factor, as well as providing low complexity receiver solutions.","PeriodicalId":264044,"journal":{"name":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124893639","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
Local Multipoint Distribution Services (LMDS) system concepts and implementation 本地多点分布服务(LMDS)系统的概念和实现
1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest Pub Date : 1997-02-23 DOI: 10.1109/MTTTWA.1997.595101
J. Langston
{"title":"Local Multipoint Distribution Services (LMDS) system concepts and implementation","authors":"J. Langston","doi":"10.1109/MTTTWA.1997.595101","DOIUrl":"https://doi.org/10.1109/MTTTWA.1997.595101","url":null,"abstract":"The Federal Communications Commission (FCC) has allocated spectrum for a new type of communications service called the Local Multipoint Distribution Service (LMDS). The Canadian government has also set aside frequencies for a similar service called Local Multipoint Communication Systems or LMCS. Both provide for approximately 1 GHz of bandwidth in the 28 GHz band. This spectrum will be auctioned to a single licensee for a Basic Trading Area (BTA) in the United States. There are 493 such BTAs in the US. The license holder can transmit video, voice, data and/or any combination of these in one-way or two-way systems using analog or digital techniques. TI's brand name for hardware and software designed to serve the LMDS/LMCS market is MulTIpoint/sup TM/. It is based on a cellular arrangement of nodes which provide broadband two-way wireless communications to subscribers located within a few kilometers of the nodes. The nodes are connected into the network via fiber optic cable. The system provides transmission of video, voice and data to a combination of business and residential customers alike. Although MulTIpoint/sup TM/ is being developed with basic technology today, next generation hardware will need to provide improved performance at lower costs. One way to achieve this is to implement many functions using digital signal processing. This paper highlights areas which are being considered for such implementation.","PeriodicalId":264044,"journal":{"name":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125567675","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
A 1.9 GHz double balanced dual gate downconversion mixer in 0.8 /spl mu/m CMOS 1.9 GHz双平衡双门下变频混频器，采用0.8 /spl mu/m CMOS
1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest Pub Date : 1997-02-23 DOI: 10.1109/MTTTWA.1997.595134
P. Sullivan, B. A. Xavier, W. Ku
{"title":"A 1.9 GHz double balanced dual gate downconversion mixer in 0.8 /spl mu/m CMOS","authors":"P. Sullivan, B. A. Xavier, W. Ku","doi":"10.1109/MTTTWA.1997.595134","DOIUrl":"https://doi.org/10.1109/MTTTWA.1997.595134","url":null,"abstract":"A low power fully integrated doubly balanced 0.8 /spl mu/m CMOS dual gate downconversion mixer is described. At an RF frequency of 1.9 GHz the mixer has a measured conversion gain of 0 dB, input referred third order intercept point of +2 dBm and a single sideband noise figure of 13.6 dB while consuming 10.2 mA of current from a 3 V power supply.","PeriodicalId":264044,"journal":{"name":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134134558","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
New low-power/high-speed double-cross-coupled ICO/VCO 新型低功耗/高速双交叉耦合ICO/VCO
1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest Pub Date : 1997-02-23 DOI: 10.1109/MTTTWA.1997.595133
N. Tchamov, A. Popov, P. Jarske
{"title":"New low-power/high-speed double-cross-coupled ICO/VCO","authors":"N. Tchamov, A. Popov, P. Jarske","doi":"10.1109/MTTTWA.1997.595133","DOIUrl":"https://doi.org/10.1109/MTTTWA.1997.595133","url":null,"abstract":"A new ICO/VCO circuit is proposed, having the ability to work from a lower voltage supply at higher speed than the existing ones. On 0.8 /spl mu/m BiCMOS (14 GHz NPN) an amplitude of 0.4 V at 1 GHz and consumption of only 5.6 mW from 2.2 V power supply is achieved. The control ability is 750 MHz/mA. The circuit has very low phase noise and it is suitable for modern PLLs.","PeriodicalId":264044,"journal":{"name":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114751025","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
CAD-oriented design of interdigitated coplanar directional coupler 交错共面定向耦合器的cad设计
1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest Pub Date : 1997-02-23 DOI: 10.1109/MTTTWA.1997.595131
X. Kang, T. Deng, P. Kooi, M. Leong
{"title":"CAD-oriented design of interdigitated coplanar directional coupler","authors":"X. Kang, T. Deng, P. Kooi, M. Leong","doi":"10.1109/MTTTWA.1997.595131","DOIUrl":"https://doi.org/10.1109/MTTTWA.1997.595131","url":null,"abstract":"This paper presents a CAD-oriented design procedure for the interdigitated coplanar directional coupler. It is based on interdigitated coupler equations and conformal mapping techniques and takes into account the width difference in the interdigitated structure and the finite thickness of the substrate. Performance measurement of a sample designed and constructed on 0.635 mm thick alumina shows close agreement with the theoretical results.","PeriodicalId":264044,"journal":{"name":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123390412","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 reuse factor vs. pathloss exponent and sectorization 频率重用因子与路径损耗指数和分割
1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest Pub Date : 1997-02-23 DOI: 10.1109/MTTTWA.1997.595122
D. Lee, C. Xu, U. Mayekar, M. Mohile
{"title":"Frequency reuse factor vs. pathloss exponent and sectorization","authors":"D. Lee, C. Xu, U. Mayekar, M. Mohile","doi":"10.1109/MTTTWA.1997.595122","DOIUrl":"https://doi.org/10.1109/MTTTWA.1997.595122","url":null,"abstract":"Lee (1989) invented the concept of frequency reuse. Lee has also concluded in general that the frequency reuse factor has to be 7 for an 18 db C/I requirement when the path-loss exponent /spl gamma/=4. A simulator was built to do an exact C/I analysis. From the analysis, it can be seen that the C/I satisfaction percentage varies with frequency reuse factor K and path-loss exponent /spl gamma/. This is a characteristic in designing a cellular system. Specifically, for 94% C/I satisfaction percentage, we only need K=3 for sectorized cells. Also, we can see that the first interfering tier is the most dominating in the interference contribution. We give a conservative approximation of the ratio of 2nd and 3rd tier to 1st tier interference for uniformly distributed mobiles in the reverse link. We also find that power control in the reverse link can improve the C/I ratio satisfaction upto 45%.","PeriodicalId":264044,"journal":{"name":"1997 IEEE MTT-S Symposium on Technologies for Wireless Applications Digest","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117012119","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: 24
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