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On the adaptive filtering for cross-polarization interference canceler 交叉极化干扰消除器的自适应滤波
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175620
I.R.A. Bahamonde, J. Romano, J. Mota
{"title":"On the adaptive filtering for cross-polarization interference canceler","authors":"I.R.A. Bahamonde, J. Romano, J. Mota","doi":"10.1109/ITS.1990.175620","DOIUrl":"https://doi.org/10.1109/ITS.1990.175620","url":null,"abstract":"The application of adaptive filtering theory in cross-polarization interference cancelers (XPIC) for digital radio systems is investigated. The authors consider an 8-PAM system with 144 Mbits/sec and a two-ray model for the cross-polarization interference. Based on the principles of the Wiener filter, a theoretical analysis of the canceler's structure is provided, presenting XPIC as a particular case of systems identification. Simulation results show the dynamic behavior of the adaptive XPIC for different levels of cross interference.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130406217","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
Friendly access to radar images: advanced database hosting rain maps, patterns, their descriptors and models 友好访问雷达图像:先进的数据库托管雨图，模式，他们的描述符和模型
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175575
A. P. Bonati
{"title":"Friendly access to radar images: advanced database hosting rain maps, patterns, their descriptors and models","authors":"A. P. Bonati","doi":"10.1109/ITS.1990.175575","DOIUrl":"https://doi.org/10.1109/ITS.1990.175575","url":null,"abstract":"The database developed for the meteorological radar of Spino d'Adda in north Italy is presented as an example of automation in this field. The system has facilities for collection, retrieval, and modeling of radar images of rain as well as their components (individual patterns) and descriptors. The SPINO80-GRM software applies techniques of image analysis to radar rain data in order to identify and characterize the required data items (rain patterns) and then organizes them into a hierarchical, relational database. The component retrieval is based on a free combination of its attributes: some statistical investigations are also possible.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126462493","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
Evaluation of filtering effects on optical BPSK systems using external cavity semiconductor lasers 外腔半导体激光器在光学BPSK系统中的滤波效果评价
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175566
J. Pires, J. D. da Rocha
{"title":"Evaluation of filtering effects on optical BPSK systems using external cavity semiconductor lasers","authors":"J. Pires, J. D. da Rocha","doi":"10.1109/ITS.1990.175566","DOIUrl":"https://doi.org/10.1109/ITS.1990.175566","url":null,"abstract":"The performance of an optical BPSK (binary phase shift keying) heterodyne system using external-cavity semiconductor lasers and a squaring loop carrier recovery circuit is evaluated theoretically via an analytical method. The method is based on the Gram-Charlier series and takes into account the effect of filtering on the baseband signal disturbed by non-Lorentzian phase noise from external-cavity semiconductor lasers and additive Gaussian noise. It is found that the filter decreases the impact of laser phase noise, namely by reducing the degradation due to relaxation oscillations.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132307715","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
Propagation parameters for the availability design of low-margin earth terminals 低边际接地终端可用性设计中的传播参数
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175576
F. Barbaliscia, M. Boumis
{"title":"Propagation parameters for the availability design of low-margin earth terminals","authors":"F. Barbaliscia, M. Boumis","doi":"10.1109/ITS.1990.175576","DOIUrl":"https://doi.org/10.1109/ITS.1990.175576","url":null,"abstract":"The authors analyze the space-time features of light rains and cloud cover which are the main factors of impairment for those low-cost earth terminals for satellite communications which are not likely to satisfy the classical CCIR availability requirements. The average yearly probability of occurrence of both phenomena is extracted from data measured in Italy at some 20 locations over many years, together with year-to-year and site-to-site variability. The statistical characteristics of the duration of both rain and cloud occurrence are also analyzed to derive indications for the appropriate dimensioning of such systems.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132815571","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 buffer reservation holding times under a processor sharing queueing discipline and setup control 处理器共享排队规则和设置控制下的缓冲区保留保持时间分析
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175590
H. Heffes, B. Sengupta
{"title":"Analysis of buffer reservation holding times under a processor sharing queueing discipline and setup control","authors":"H. Heffes, B. Sengupta","doi":"10.1109/ITS.1990.175590","DOIUrl":"https://doi.org/10.1109/ITS.1990.175590","url":null,"abstract":"The authors model the buffer reservation (allocation) holding time as the sojourn time in an M/M/1/K processor sharing queue, where K corresponds to the limit on the number of active virtual circuits sharing a congested trunk's bandwidth. They evaluate the exact results for the M/M/1/K processor sharing sojourn time distribution and show that it is of phase-type. Numerical results demonstrate the amount of smoothing induced by the limit K, as well as the robustness of the overload performance. For the case of general holding time distributions, in the absence of contention from other virtual circuits, i.e. the M/G/1/K processor sharing queue, the authors present an approximate method for evaluating the coefficient of variation of the sojourn time distribution, and compare these results with simulations.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132214577","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
Bend losses in rectangular dielectric waveguides with three dielectric layers 三介电层矩形介质波导的弯曲损耗
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175571
R.M. de Felice Souza, A. Giarola
{"title":"Bend losses in rectangular dielectric waveguides with three dielectric layers","authors":"R.M. de Felice Souza, A. Giarola","doi":"10.1109/ITS.1990.175571","DOIUrl":"https://doi.org/10.1109/ITS.1990.175571","url":null,"abstract":"Radiation losses due to the curvature in rectangular optical dielectric waveguides with a step index of refraction profile in the upper and lower faces are examined. Expressions are obtained for the propagation constants along the x and y directions of the waveguide, for the conversion coefficient and for the attenuation coefficient. Appreciable radiation loss reduction compared with the homogeneous waveguide is observed.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123365169","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
Performance comparison of service strategies in high speed optical token rings 高速光学令牌环中业务策略的性能比较
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175580
T. Welzel
{"title":"Performance comparison of service strategies in high speed optical token rings","authors":"T. Welzel","doi":"10.1109/ITS.1990.175580","DOIUrl":"https://doi.org/10.1109/ITS.1990.175580","url":null,"abstract":"High-speed local area networks (HSLANs) operate at channel capacities of at least 100 Mbit/s. Taking advantage of the progress in optical transmission technique, the first HSLAN based on a token passing ring, namely FDDI (fiber distributed data interface) has now become commercially available. However, several other strategies to determine the token holding duration at a station may be applied, e.g. single service or exhaustive service. The author evaluates and compares the performance of these token ring protocols for a high-speed backbone network interconnecting possibly heterogeneous conventional local area subnetworks. Every media access protocol under consideration has been shown to work very well for typical numbers of stations (<or=25) in the asynchronous mixed traffic environment. At heavy load the FDDI protocol performs better than the single service strategy due to the educed token rotation overhead, especially for larger values of T-OPR.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115876313","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
Fiber optics use in digital integrated telecommunication systems in mining works 光纤在矿山数字综合通信系统中的应用
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175649
M.A. De La Sotta Cerbino, O. Perez
{"title":"Fiber optics use in digital integrated telecommunication systems in mining works","authors":"M.A. De La Sotta Cerbino, O. Perez","doi":"10.1109/ITS.1990.175649","DOIUrl":"https://doi.org/10.1109/ITS.1990.175649","url":null,"abstract":"The advantages of fiber optic applications in mining works are examined, the main specific transmission applications are studied, and an integrated digital network project is presented. The integrated digital network permits the transmission of a great variety of signals such as telephony, data, and video from and to the mining processes. The network uses optical fibers as the medium of transmission and digital MUX/DMUX to frame the signals.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124728807","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
1.3/1.55 microns duplex-diplex optical transmission: the Brasilian technology 1.3/1.55微米双工双工光传输:巴西技术
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175646
S. Celaschi, J. Rosolem, J. T. Jesus
{"title":"1.3/1.55 microns duplex-diplex optical transmission: the Brasilian technology","authors":"S. Celaschi, J. Rosolem, J. T. Jesus","doi":"10.1109/ITS.1990.175646","DOIUrl":"https://doi.org/10.1109/ITS.1990.175646","url":null,"abstract":"Results are presented from the first experimental Brazilian route in which two separate optical channels have been combined in both duplex and diplex transmission. The experiments were demonstrated over 18 km of standard single-mode fiber using 1.29 and 1.52 micron edge-emitting laser diodes at 34 Mbit/s. The optical emitters and detectors were linked to the SM fiber through specially designed WDM (wavelength division multiplexing) couplers. The results indicate that either duplex or diplex transmission can be implemented in any installed standard SM route up to 40 km.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121500651","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
An approximation algorithm for irregular-ripple filters 不规则纹波滤波器的近似算法
SBT/IEEE International Symposium on Telecommunications Pub Date : 1990-09-03 DOI: 10.1109/ITS.1990.175641
A.C.M. de Queiroz, Luiz P. Calôba
{"title":"An approximation algorithm for irregular-ripple filters","authors":"A.C.M. de Queiroz, Luiz P. Calôba","doi":"10.1109/ITS.1990.175641","DOIUrl":"https://doi.org/10.1109/ITS.1990.175641","url":null,"abstract":"A simple formulation is presented for the approximation of low-pass filters with specified number and level of ripples in the passband and stopband. The order of any finite attenuation or transmission zero can be specified as simple or double, and these zeros are not restricted to the jw axis. The method can be used to numerically obtain the characteristic functions of approximations ranging from the Butterworth to the elliptic ones.<<ETX>>","PeriodicalId":405932,"journal":{"name":"SBT/IEEE International Symposium on Telecommunications","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117119266","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
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