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Nonlinear importance sampling techniques for efficient simulation of communication systems 用于通信系统高效仿真的非线性重要采样技术
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117155
Heinz-Josef Schlebusch
{"title":"Nonlinear importance sampling techniques for efficient simulation of communication systems","authors":"Heinz-Josef Schlebusch","doi":"10.1109/ICC.1990.117155","DOIUrl":"https://doi.org/10.1109/ICC.1990.117155","url":null,"abstract":"The use of nonlinear biasing techniques in importance sampling (IS) simulations is discussed. For tail probability estimation, two new nonlinear IS (NLIS) approaches are presented: shift of absolute values (SAV) and sample elimination (SE). In the case of linear systems with Gaussian input, the SAV method is shown to be uniformly more efficient than the linear techniques and very robust with respect to suboptimal parameterization. With respect to suboptimal choice of its parameter, the efficiency of the SE method is more sensitive than that of all other IS techniques discussed. Both NLIS methods are found to be easily implementable alternatives to the standard linear IS(LIS) techniques. The estimation of very-low-interval probabilities is considered as a new field for the application of IS techniques. The author presents both an LIS and an NLIS approach for this problem and provides performance analyses. A uniform bound on the required sample size is obtained for both techniques, thus emphasizing their high efficiency. Both methods are shown to be very robust with respect to suboptimal parameterization.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126021827","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
Performance of alternative MAN architectures for high-speed data applications 高速数据应用中备用城域网架构的性能
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117330
A. DeSimone, V. Saksena
{"title":"Performance of alternative MAN architectures for high-speed data applications","authors":"A. DeSimone, V. Saksena","doi":"10.1109/ICC.1990.117330","DOIUrl":"https://doi.org/10.1109/ICC.1990.117330","url":null,"abstract":"The authors analyze the performance of alternative metropolitan area network architectures for traditional data networking and for emerging distributed client/server computing applications. A simple traffic model contains the essential features of distributed computing applications. Delay performance on the MAN is examined for two architectures: networking based on variable-size datagrams, and networking based on asynchronous transfer mode protocols that use short, fixed-length cells. It is shown that the traffic characteristic of client/server computing-bimodal message-length distributions and bursty, clustered arrivals-can have significant effects on the delay performance of MANs. In particular, the presence of large and variable-size datagrams leads to large delays and variabilities in delay in connectionless networks as the length of network connections increases. Networks that use small cells in the style of ATM provide superior end-to-end delay performance and therefore provide a superior architecture for MANs designed to carry a diverse traffic mix.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125296235","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
A digital signal processing demodulator with a wide frequency acquisition range 具有宽频率采集范围的数字信号处理解调器
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117301
T. Takenaka, H. Furukawa, Y. Tozawa, T. Miyo, S. Takenaka
{"title":"A digital signal processing demodulator with a wide frequency acquisition range","authors":"T. Takenaka, H. Furukawa, Y. Tozawa, T. Miyo, S. Takenaka","doi":"10.1109/ICC.1990.117301","DOIUrl":"https://doi.org/10.1109/ICC.1990.117301","url":null,"abstract":"A demodulator capable of variable baud rate (f/sub b/) operation satisfies the requirements for a forward error correcting decoder for satellite communication systems such as VSAT systems. A new method of frequency acquisition, called swept automatic frequency control has a wide f/sub b/-independent acquisition range and prevents false locking of the carrier recovery circuit. The authors have evaluated such a demodulator and confirm that it performs satisfactorily.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120816145","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
Electro-optic switching systems 电光交换系统
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117248
I. Bennion, L. Thylén, N. Whitehead
{"title":"Electro-optic switching systems","authors":"I. Bennion, L. Thylén, N. Whitehead","doi":"10.1109/ICC.1990.117248","DOIUrl":"https://doi.org/10.1109/ICC.1990.117248","url":null,"abstract":"Potential network applications of photonic switching based on the use of guided-wave electrooptics technology are reviewed. The characteristics and limitations of the component technologies for space and time switching are discussed with reference to the present state of the art. Systems experiments and demonstrations are described. It is noted that technology for electrooptic switch arrays has progressed to the point where systems evaluations and demonstrations aimed at a range of network applications can be carried out. These arrays are expected to offer performance advantages in space division switching and some synchronous transfer mode applications. Arrays of sizes up to 16*16 have been demonstrated; improvements are required in techniques for efficiently interconnecting switch modules to form larger fabrics. Techniques for capacity expansion are being addressed, the most significant employing optical amplification, coherent optical transmission techniques, and wavelength division switching concepts.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"141 4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128774346","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
Gain normalization in a 4200 bps homomorphic vocoder 在4200 bps同态声码器中获得归一化
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117213
J. Chung, R. W. Schafer
{"title":"Gain normalization in a 4200 bps homomorphic vocoder","authors":"J. Chung, R. W. Schafer","doi":"10.1109/ICC.1990.117213","DOIUrl":"https://doi.org/10.1109/ICC.1990.117213","url":null,"abstract":"The authors describe a novel technique for coding the gains in a vector excitation homomorphic vocoder. In this system, the excitation signal, which is obtained by analysis-by-synthesis, consists of a part derived from a Gaussian codebook and a part derived from the past excitation. The authors show how the correlation between the two gain parameters of the excitation can be increased and how they can be jointly coded at a lower bit rate. This approach makes it possible to reduce the bit rate of the homomorphic vocoder from 4800 b/s to 4200 b/s with essentially no degradation in speech quality.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114931121","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
The ALEX service-a technical overview ALEX服务—技术概述
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117341
J. Chammas
{"title":"The ALEX service-a technical overview","authors":"J. Chammas","doi":"10.1109/ICC.1990.117341","DOIUrl":"https://doi.org/10.1109/ICC.1990.117341","url":null,"abstract":"Bell Canada's new interactive communications service provides customers with a wide range of electronic information and transaction applications. The author presents a technical overview of the ALEX network architecture and service standard that led to the successful introduction of the service. The key implementation decisions made for developing an easy-to-use service targeted at the general public are detailed. The work accomplished to ensure the congeniality and quality of the services being offered is also highlighted. It is concluded that the ALEX technicl and user interface specifications issued to service developers and the technical support provided have contributed to the availability of fault-free and easy-to-use applications.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130724039","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
Design of the wavelength-division optical network 波分光网络的设计
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117217
J. Bannister, M. Gerla
{"title":"Design of the wavelength-division optical network","authors":"J. Bannister, M. Gerla","doi":"10.1109/ICC.1990.117217","DOIUrl":"https://doi.org/10.1109/ICC.1990.117217","url":null,"abstract":"The authors consider the wavelength-division optical network (WON), a generalization of the ShuffleNet concept. Motivated by the potential drawback of large delays in poorly designed WONs, they introduce and use a queuing-network model of the WON that provides a general framework for analyzing the performance of these networks. This performance model is used to formulate the virtual-topology design problem. Using the optimization technique of simulated annealing, a number of instances of the virtual-topology design problem were solved. The results have been very encouraging and have yielded significant-and sometimes dramatic-improvement in delay and throughput, compared to previously proposed, unoptimized design approaches such as ShuffleNet and the Manhattan street network. The authors discuss their experiences with the optimization algorithm and outline continuing efforts in this area.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116802985","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: 39
A 2.4 Gbit/s synchronous optical fiber transmission system 2.4 Gbit/s同步光纤传输系统
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117109
H. Klinger, E. Kremers, J. Schmitz, F. Tischer, D. Larner, G. Le Fort, A. Riou, G. Iudicello, R. Valussi, M. Shearme
{"title":"A 2.4 Gbit/s synchronous optical fiber transmission system","authors":"H. Klinger, E. Kremers, J. Schmitz, F. Tischer, D. Larner, G. Le Fort, A. Riou, G. Iudicello, R. Valussi, M. Shearme","doi":"10.1109/ICC.1990.117109","DOIUrl":"https://doi.org/10.1109/ICC.1990.117109","url":null,"abstract":"An optical-fiber transmission system which operates at a line bit-rate of 2.4 Gb/s is described. It is in full accordance with the guidelines of the CCITT recommendations for the Synchronous Digital Hierarchy (SDH), accepting up to sixteen 155.52 Mb/s STM-1 (Synchronous Transport Module-1) streams. Alternative tributary plug-in units permit simultaneous multiplexed transmission of STM-1 signals in either optical or electrical form, or of plesiochronous electrical input signals at the standard 140 Mb/s rate. The system meets full production standards and has the operating margins, network-management, and auxiliary-channel facilities required by modern digital transmission networks.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131147732","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 to the pedestal . . . then what? 光纤到基座…然后呢?
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117026
J. Jensen, W. A. Weeks
{"title":"Fiber to the pedestal . . . then what?","authors":"J. Jensen, W. A. Weeks","doi":"10.1109/ICC.1990.117026","DOIUrl":"https://doi.org/10.1109/ICC.1990.117026","url":null,"abstract":"The possible avenues for evolution of the fiber pedestal are presented. The effects are analyzed on three key components of the fiber-based distribution system: the architecture, the optical network unit, and the subscriber drop. The technical and economic issues regarding the evolution toward various broadband networks are also provided. It is concluded that current analysis favors the placement of a star or logical bus in the distribution plant and the design of a pedestal which is capable of future service evolution. Movement of fiber into the subscriber drop will ultimately hinge on the demand for broadband services.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132705553","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
The simulation study of meteor burst communication based on two node model 基于双节点模型的流星突发通信仿真研究
IEEE International Conference on Communications, Including Supercomm Technical Sessions Pub Date : 1990-04-16 DOI: 10.1109/ICC.1990.117261
N. Zhang, A. Rawlins
{"title":"The simulation study of meteor burst communication based on two node model","authors":"N. Zhang, A. Rawlins","doi":"10.1109/ICC.1990.117261","DOIUrl":"https://doi.org/10.1109/ICC.1990.117261","url":null,"abstract":"In order to investigate the significance of the design of link layer protocols in the MBC (meteor burst combination) system, a two-node MBC model has been developed. A performance investigation of MBC on the random intermittent channel with random error assumption has been conducted. Two different link protocols have been simulated: (1) unblocked packet transmission with stop-and-wait automatic repeat request (ARQ) and (2) blocked packet transmission with the same ARQ scheme. Two different channel acquisition methods have been studied: the Tx polling only and Tx/Rx polling schemes. Two system configurations, half-duplex and full-duplex, have been investigated. Simulation results for the error-free case and the random error case are presented. It is found that protocols and system configurations play very important roles in the performance of the MBC. Different polling schemes, however, seem to have little effect on the channel utilization efficiency.<<ETX>>","PeriodicalId":126008,"journal":{"name":"IEEE International Conference on Communications, Including Supercomm Technical Sessions","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131981545","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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