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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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Techno-economics of advanced optical subscriber networks 先进光用户网络的技术经济学
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64169
D. Gardan, A. Zaganiaris, A. Madani, R. Madigou, D. Machón
{"title":"Techno-economics of advanced optical subscriber networks","authors":"D. Gardan, A. Zaganiaris, A. Madani, R. Madigou, D. Machón","doi":"10.1109/GLOCOM.1989.64169","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64169","url":null,"abstract":"An ad hoc geometrical model has been developed for evaluating the quantities of the components needed in various video communications systems. The impact of key field factors such as subscriber density variation was investigated through practical examples from real operating networks. The overall system costs, including costs of active and passive components as well as electronics and implementation expenditures, were calculated for two single-mode systems: AM with one fiber per subscriber andFM with fiber share. The evaluation was carried out for three user-density configurations corresponding to urban, suburban, and rural zones. The cost analysis was performed for short- and long-term component costs. The overall system cost turns out to be lower for the FM configuration; this is valid for both the short term and the long term.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"94 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":"127026320","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: 15
Evaluation of an admission control scheme for an ATM network considering fluctuations in cell loss rate 考虑小区损失率波动的ATM网络准入控制方案的评价
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64247
Takashi Kamitake, Tatsuya Suda
{"title":"Evaluation of an admission control scheme for an ATM network considering fluctuations in cell loss rate","authors":"Takashi Kamitake, Tatsuya Suda","doi":"10.1109/GLOCOM.1989.64247","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64247","url":null,"abstract":"The authors investigate an admission-flow-control scheme for an ATM (asynchronous transfer mode) network and analytically obtain the cell loss rate considering fluctuations in the number of active calls on a network. A queuing model is developed for an ATM switch where a number of bursty calls are multiplexed onto an output port of a switch. To make the analysis tractable, it is assumed that the number of active calls changes slowly relative to the cell transmission time (quasi-stationary approximation). It is shown that the fluctuation of the cell loss rate is larger when high-speed calls (e.g. 10 Mb/sec) are multiplexed than when low-speed calls (e.g. 64 kb/sec) are multiplexed. Furthermore, it is observed that congestion may last for more than several hundred milliseconds, which is comparable to or even longer than one talkspurt (burst). Thus, it is shown that bursty cell loss is a serious problem.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"170 6 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":"122573168","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: 69
Tilted-beam, beam-width- and space-diversity improvements on various paths 倾斜波束，波束宽度和不同路径上的空间分集改进
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.63938
A. Satoh, O. Sasaki
{"title":"Tilted-beam, beam-width- and space-diversity improvements on various paths","authors":"A. Satoh, O. Sasaki","doi":"10.1109/GLOCOM.1989.63938","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.63938","url":null,"abstract":"Results of diversity improvements on various paths are presented. Propagation tests were conducted on paths over land and water. Several antenna beam configurations were used to clarify improvements in received power obtained by using tilted-beam-, beam-width-, and space-diversity reception. In order to evaluate the diversity improvement, a three-ray model is derived. The results show that diversity improvement is clearly dependent on the path conditions. Thus, path conditions should be considered in order to achieve the best diversity improvement.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"72 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":"122673074","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
Parameters affecting mode partition noise in laser transmission systems 影响激光传输系统模分噪声的参数
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64056
M. Ramadan
{"title":"Parameters affecting mode partition noise in laser transmission systems","authors":"M. Ramadan","doi":"10.1109/GLOCOM.1989.64056","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64056","url":null,"abstract":"An analysis is carried out to determine the parameters affecting mode partition noise in a laser transmission system operating at a gigabits per second data rate using long dispersive fibers. The analysis is based on a Monte Carlo simulation technique of mode partition noise in systems using single-mode or multimode lasers. Some interesting results were found when the fiber dispersion and/or bit rate were high and raised cosine shaping of the data was used. The results show that, as the dispersion is increased, the bit error rate floor, due to the mode partition noise, increases to a maximum value and then decreases substantially to a minimum and oscillates periodically between those two extremes. The period between maximums is determined by the bit rate, fiber dispersion, and mode spacing. Experimental results substantiating the theoretical predictions are given for a single-mode laser. For the case of a multimode laser, it was found that because of pulse shaping there are certain modes which contribute most to mode partition noise. Specifically, the modes contributing most to mode partition noise in typical 560 Mb systems are typically the fifth to seventh modes, which are displaced from the central mode on the short wavelength side. This result suggests a new criterion for choosing multimode lasers with low mode partition noise based on the intensity of those modes.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"2 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":"122115599","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
New design of a 64 kbps modem 64 kbps调制解调器的新设计
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64279
Changxin Fan, Zengjun Zhang
{"title":"New design of a 64 kbps modem","authors":"Changxin Fan, Zengjun Zhang","doi":"10.1109/GLOCOM.1989.64279","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64279","url":null,"abstract":"The design of a 64-kb/s modem that uses a single-chip digital signal processor (DSP) is described. The key points of the modem implementation with DSP are generation of satisfactory PRS-SSB (partial response suppressed carrier single side band) line signals, recovery of the carrier in the received signals, and acquisition of the bit-synchronization information. Some computer simulation results are given.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"17 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":"129959438","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
Software quality via rapid prototyping 通过快速原型设计提高软件质量
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64048
A. Jain, P. D. Ting
{"title":"Software quality via rapid prototyping","authors":"A. Jain, P. D. Ting","doi":"10.1109/GLOCOM.1989.64048","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64048","url":null,"abstract":"Rapid prototyping is described as a software development process which provides improved software quality and increases software productivity, in addition to providing other benefits such as reduced costs, reduced risk, shorter schedules, and customer satisfaction. This process does not usually produce throwaway prototypes; rather, prototyping methodology is employed without using any specific rapid prototyping tools to produce field-grade products. The approach emphasizes selection of smaller teams working closely with the customers. Using rapid prototyping, many successful software systems that perform planning, provisioning, monitoring, and maintenance operations support for various AT&T network services have been developed.<<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":"130632864","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
Designing high speed controllers for high speed local area networks 高速局域网高速控制器的设计
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.63961
P. Martini, M. Rupprecht
{"title":"Designing high speed controllers for high speed local area networks","authors":"P. Martini, M. Rupprecht","doi":"10.1109/GLOCOM.1989.63961","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.63961","url":null,"abstract":"Performance requirements for bridges interconnecting LANs (local area networks) and HSLANs (high-speed LANs) were studied. It turned out that, in many cases, state-of-the-art bridges are much more likely to be the bottleneck than the medium access protocol used in the HSLAN. Thus, speeding up network controllers will be inevitable. This holds even more for the implementation of more complex functions required for gateways and direct interconnection of high-speed devices. Working in parallel will probably be the only solution for speeding up network controllers.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"69 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":"123378673","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
Generalized Viterbi algorithms for error detection with convolutional codes 卷积码错误检测的广义Viterbi算法
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64204
N. Seshadri, C. Sundberg
{"title":"Generalized Viterbi algorithms for error detection with convolutional codes","authors":"N. Seshadri, C. Sundberg","doi":"10.1109/GLOCOM.1989.64204","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64204","url":null,"abstract":"Presented are two generalized Viterbi algorithms (GVAs) for the decoding of convolutional codes. They are respectively, a parallel algorithm that simultaneously identifies the L best estimates of the transmitted sequence, and a serial algorithm that identifies the lth best estimate using the knowledge about the previously found l-1 estimates. These algorithms are applied to combined speech and channel coding systems, concatenated codes, trellis-coded modulation, partial response (continuous-phase modulation), and hybrid ARQ (automatic repeat request) schemes. As an example, for a concatenated code more than 2 dB is gained by the use of the GVA with L=3 over the Viterbi algorithm for block error rates less than 10/sup -2/. The channel is a Rayleigh fading channel.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"47 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":"123686207","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: 48
Statistical distribution of parameters in a variable delay two-ray propagation model 变延迟双射线传播模型中参数的统计分布
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.63941
P. Balaban, V. P. Dewal
{"title":"Statistical distribution of parameters in a variable delay two-ray propagation model","authors":"P. Balaban, V. P. Dewal","doi":"10.1109/GLOCOM.1989.63941","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.63941","url":null,"abstract":"Propagation data obtained from a 6-GHz channel with a 30-MHz bandwidth over a 23.3 mile path are used to obtain the statistics of parameters of propagation for two models, namely, the two-ray model and W.D. Rummler's (1979) model. Only scans with both an in-band notch and an in-band power difference greater than 1 dB are considered. It is noted that the statistics of the relative delay between rays is important because the mean of this delay is directly related to the severity of the dispersive fading and the outage time of the system. The results show that the relative delay of the second ray in the two-ray model can be best approximated by a gamma distribution.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"105 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":"121286844","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
Groupwise and collaborative systems-a big picture view 团队和协作系统——一个大的视图
IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64148
R. Johansen
{"title":"Groupwise and collaborative systems-a big picture view","authors":"R. Johansen","doi":"10.1109/GLOCOM.1989.64148","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64148","url":null,"abstract":"Groupware and collaborative systems, terms used to describe the general area of term-oriented computing, are discussed. More than a new technology or a new class of products, groupware is a perspective on computing and telecommunications. This perspective is based on the premise that the user is a collaborative work group, rather than an individual-as in personal computing-or an aggregation of unallied users-as in time-share computing. There are both electronic and nonelectronic forms of groupware. Electronic groupware typically involves the use of shared computing and telecommunications resources that are used collaboratively by teams. Four groupware options are discussed, and future directions are indicated.<<ETX>>","PeriodicalId":256305,"journal":{"name":"IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond","volume":"11 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":"116327779","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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