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IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond最新文献

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The US West Advanced Technologies prototype multimedia communication system 美国西部先进技术公司的多媒体通信系统原型
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64149
S. Bulick, M. Abel, D. Corey, J. Schmidt, S. Coffin
{"title":"The US West Advanced Technologies prototype multimedia communication system","authors":"S. Bulick, M. Abel, D. Corey, J. Schmidt, S. Coffin","doi":"10.1109/GLOCOM.1989.64149","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64149","url":null,"abstract":"The authors describe a prototype geographically distributed, real-time multimedia communication system currently in everyday use at US West Advanced Technologies. To test it, nine of approximately 40 researchers in the Science and Technology Division have been relocated from the US West Advanced technologies headquarters in Englewood, Colorado, to Boulder, Colorado, a distance of some 40 miles. After an explanation of the technical infrastructure of the system and some of the choices made in building it, the authors discuss some of the problems encountered and some of the lessons learned from this experience. The experience described is grouped into two main areas: (1) the engineering of the system, and (2) the behavioral and social aspects of using and living with the system.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115420882","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: 23
High efficient transmission on digital microwave radio 在数字微波收音机上高效传输
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64000
T. Ryu, S. Maeda, S. Ozaki, H. Hashimoto, A. J. Moreland
{"title":"High efficient transmission on digital microwave radio","authors":"T. Ryu, S. Maeda, S. Ozaki, H. Hashimoto, A. J. Moreland","doi":"10.1109/GLOCOM.1989.64000","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64000","url":null,"abstract":"The high-capacity digital microwave radio (DMR) currently used for trunk lines has a 4.5-b/Hz efficiency using 64 QAM (quadrature amplitude modulation) modulation and transmits 135-Mbps data within a 30-MHz bandwidth. When dual-polarization transmission techniques are used, an efficiency of 9 b/Hz can be achieved and transmission of 270 Mb/s data in the 30-MHz bandwidth becomes possible. The features and configuration of a 64 QAM DMR transmission system using dual polarization are presented. It is concluded that, currently, the 64 QAM DMR with XPIC (cross-polarization interference cancellers) is the most feasible system from both the technical and economical viewpoints when a capacity of higher than 135 Mb/s is required.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114487038","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
A versatile time domain Reed-Solomon decoder 一个多功能的时域里德-所罗门解码器
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64125
Y. Shayan, T. Le-Ngoc, V. Bhargava
{"title":"A versatile time domain Reed-Solomon decoder","authors":"Y. Shayan, T. Le-Ngoc, V. Bhargava","doi":"10.1109/GLOCOM.1989.64125","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64125","url":null,"abstract":"A versatile Reed-Solomon (RS) decoder structure based on a time-domain decoding algorithm is developed. The algorithm is modified to increase the performance, and a method is introduced to decode any RS code generated by any generator polynomial. The main advantage of the introduced decoder structure is the versatility. By a versatile decoder, the authors mean a decoder that can be programmed to decode any RS code defined in Galois field 2/sup m/ with a fixed symbol size m. This decoder can correct both errors and erasures for any RS code, including shortened and singly extended codes. The introduced decoder has a very simple structure and can be used to design high-speed, single-chip VLSI decoders.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114732035","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
A network status monitoring system using personal computer 一种使用个人计算机的网络状态监测系统
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.63967
L. Chang, W. Chan, J. Chang, P. Ting, M. Netrakanti
{"title":"A network status monitoring system using personal computer","authors":"L. Chang, W. Chan, J. Chang, P. Ting, M. Netrakanti","doi":"10.1109/GLOCOM.1989.63967","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.63967","url":null,"abstract":"The Customer Operations Service Management Interface Control (COSMIC) system, a network status monitoring system used by an AT&T Network Control Center (NCC) to monitor the status of a large private telecommunications network is described. COSMIC integrates and correlates network alarm information and graphically displays the network's status on a near-real-time basis. COSMIC has established the use of personal computers for network status monitoring. Its main capabilities are in the areas of real-time graphical displays for network management. Its features include a hierarchical graphical display of the network configuration, alarm correlation, and additional database referencing features. COSMIC provides a user-friendly and easy-to-use interface to the technicians in the NCC. The system has been deployed in the NCC for more than a year, and the efficiency of network management operations with the NCC has improved substantially. The software and hardware architecture of the COSMIC system and the features and functionality it provides to the NCC are described.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114989718","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
A mobile communication system providing integrated voice/data services over power limited satellite channels 在功率有限的卫星信道上提供综合话音/数据业务的移动通信系统
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64067
S. K. Bose, J. Gordon
{"title":"A mobile communication system providing integrated voice/data services over power limited satellite channels","authors":"S. K. Bose, J. Gordon","doi":"10.1109/GLOCOM.1989.64067","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64067","url":null,"abstract":"The modeling and analysis of a system providing integrated voice/data services to mobile terminals over a power-limited satellite channels are discussed. The mobiles use slotted ALOHA random access to send requests for channel assignments to a central station. For successful requests, the actual transmission of voice/data within a call is done using the channel assigned for this purpose by the central station. The satellite channel is assumed to be power limited. Taking into account the known burstiness of voice sources (which use a voice-activated switch), the central station overassigns channels so that the average total power is below the power limit of the satellite transponder. The performance of this model is analyzed. Certain simple, static control strategies for improving performance are also proposed.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117193337","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
Six-dimensional trellis-coded modulation 六维格子编码调制
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64202
A. Chouly, H. Sari
{"title":"Six-dimensional trellis-coded modulation","authors":"A. Chouly, H. Sari","doi":"10.1109/GLOCOM.1989.64202","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64202","url":null,"abstract":"A family of trellis-coded modulation (TCM) schemes is presented which is based on two-step partitioning of six-dimensional (6D) signal constellations. Maximum-likelihood detection of these schemes based on the Viterbi algorithm is described. The asymptotic gain is 3.01 dB for the two-state code, and 4.33 dB for the four- and eight-state codes which involve a smaller expansion of the uncoded signal alphabet. A comparison is made between proposed schemes and the conventional 2D TCM in terms of tradeoff between performance and detection complexity. It is shown that some of the proposed schemes have a significant advantage over 2D TCM. In particular, the eight-state 6D trellis code involves only half of the complexity of the eight-state 2D code while providing an additional gain of 0.15 dB.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117269631","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
Voice control of the pan-European digital mobile radio system 语音控制的泛欧洲数字移动无线电系统
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64122
C. Southcott, D. Freeman, G. Cosier, D. Sereno, A. van der Krogt, A. Gilloire, H. Braun
{"title":"Voice control of the pan-European digital mobile radio system","authors":"C. Southcott, D. Freeman, G. Cosier, D. Sereno, A. van der Krogt, A. Gilloire, H. Braun","doi":"10.1109/GLOCOM.1989.64122","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64122","url":null,"abstract":"The DTX (discontinuous transmission) system that has been standardized by CEPT for the pan-European digital mobile radio system is described. In this mode the transmitter is switched on when a user begins to talk and switched off again when he or she stops. There are two reasons for using DTX: to increase the number of radio channels (by 100% or more) which can be accommodated in a given bandwidth and to reduce the power drain in hand portable equipment. It is noted that, while adding little degradation to the speech channel and very little additional cost, the DTX will increase considerably the capacity of the system. Particular attention is given to the voice activity detector, the comfort noise subsystem, speech frame substitution, objective and subjective testing, and complexity.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"151 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117353278","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: 26
An analytical technique for evaluating packet routing policies in metropolitan area networks 城域网中评估分组路由策略的分析技术
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64115
B. Khasnabish
{"title":"An analytical technique for evaluating packet routing policies in metropolitan area networks","authors":"B. Khasnabish","doi":"10.1109/GLOCOM.1989.64115","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64115","url":null,"abstract":"An analytical technique for evaluating packet routing strategies in metropolitan (or wide) area networks is presented. This technique determines the upper bound of the mean packet transfer time in a class of regular mesh networks called Manhattan street networks. The proposed technique is based on determining the internode distance distribution and the topology z-transform for an ideal (i.e. where the links are of infinite capacity or the nodes are equipped with infinite buffer space) version of the network under consideration for a specific traffic distribution pattern. Deviations from the ideal conditions are taken into account by incorporating a tuning parameter and a penalty indicator in the performance equations. The value of the tuning parameter is zero for the ideal network. The penalty indicator depends on the network's topology and the type (i.e. half-duplex or full-duplex) of communication links used in the network.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"601 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116309239","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
On the NEXT and impulse noise properties of subscriber loops 用户环路的NEXT和脉冲噪声特性研究
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64210
K. Széchényi
{"title":"On the NEXT and impulse noise properties of subscriber loops","authors":"K. Széchényi","doi":"10.1109/GLOCOM.1989.64210","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64210","url":null,"abstract":"The transmission range of subscriber loops carrying ISDN (integrated services digital network) signals with a net bit rate of 144 kb/s is limited mainly by the near-end crosstalk (NEXT) between cable pairs and by impulse noise transformed into these loops owing to their imperfect symmetry. In order to be able to predict this transmission range, a considerable amount of experimental and theoretical work was required prior to the introduction of ISDN for a better understanding of the cross-talk and noise phenomena in these loops. The author summarizes NEXT measurement results and modeling methods and reports on impulse noise measurements and the statistical models derived from them. Detailed results of swept-frequency measurements in different cables are considered. Measurement results indicate considerable variation in the density of impulse noises within 24 h, a hyperbolic distribution, interval distribution according to the sum of exponential functions, and steadily increasing amplitude density below 40 kHz.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124480345","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
Protection of SONET based networks 基于SONET的网络保护
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64078
R. D. Hall, S. Whitt
{"title":"Protection of SONET based networks","authors":"R. D. Hall, S. Whitt","doi":"10.1109/GLOCOM.1989.64078","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64078","url":null,"abstract":"The authors address the issue of telecommunications network protection, with particular reference to optical fibers and the new topologies made possible using the SONET signal format. It is found that the introduction of SONET-based networks provides an ideal opportunity to reappraise protection methodologies and to improve customer circuit availability significantly. The authors propose techniques for achieving these aims by examining a whole network from customer to customer so that weak links in the chain can be identified. In this manner, the network operator can be sure that investment in infrastructure is correctly targeted to provide a service that satisfies the customers' expectations.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125847575","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
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