IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond最新文献_第4页

Comprehensive improvement in low bit rate speech coding 低比特率语音编码的全面改进

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64271

Changxin Fan, Hongfei Ma

引用次数: 0

Tackling productivity and quality through customer involvement and software technology 通过客户参与和软件技术解决生产力和质量问题

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64046

H.S. Burns, R.A. Halliburton

引用次数: 9

High-speed self-healing ring architectures for future interoffice networks 用于未来局间网络的高速自愈环架构

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64075

Tianyuan Wo, D. Kolar, R. H. Cardwell

引用次数: 44

Integrated OS features for geographically distributed switching exchanges 集成的操作系统功能，地理上分布式交换交换机

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64131

G. Arrigoni, G. Fantauzzi

引用次数: 0

Scattered microwave energy and building surface features 散射微波能量与建筑物表面特征

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.63943

A.R. Noerpel, A. Ranade

{"title":"Scattered microwave energy and building surface features","authors":"A.R. Noerpel, A. Ranade","doi":"10.1109/GLOCOM.1989.63943","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.63943","url":null,"abstract":"It has been shown previously by the authors (Electron. Lett., vol.23, no.18, p.922-4, 1987) that city structures with regular layouts of streets and buildings present an ordered geometry whose effect on scattered interference, although heretofore neglected, is significant. A method is developed to characterize the effect of such building features. Scattering patterns from building structures are described in terms of a functionality equivalent facade made of finite number of smooth panels with small random tilts about its plane. The scattering problem is defined by the orientation of the buildings, and the gross structure of building surfaces is characterized by the number of panels with distinct offset from each other azimuthal tilt and attenuation by the material of the building facade. The reasonable bounds for the first two parameters are 1<N<or=10; 0<S/sub tau /<or=1 degrees . Within these bounds, for a facade of given surface area the level of off-specular interference increases nearly linearly with the number of panel subdivisions. The degree of tilt determines the broadening of the beam pattern in the near specular direction. The amount of interference in the nonspecular region is estimated using both the physical and geometrical theories of diffraction. The observed interference in Kansas City is within bounds predicted by the building model.<<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":"134282360","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

A new approach to the provision of POTS and CATV over passive optical networks 无源光网络上提供POTS和CATV的新方法

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64228

P. Rosher, A. Cooper, S. Fenning, L. Bickers

引用次数: 2

Tradeoff of horizontal decomposition versus vertical stacking in rearrangeable nonblocking networks 可重排非阻塞网络中水平分解与垂直叠加的权衡

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64142

C. Lea, D. Shyy

引用次数: 114

Flexible power and bandwidth allocation in mobile satellites 移动卫星的灵活功率和带宽分配

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64065

L. Keyes

{"title":"Flexible power and bandwidth allocation in mobile satellites","authors":"L. Keyes","doi":"10.1109/GLOCOM.1989.64065","DOIUrl":"https://doi.org/10.1109/GLOCOM.1989.64065","url":null,"abstract":"The introduction of L-band mobile communication services by spot beam satellites creates a payload design challenge due to uncertainty in the location and size of the new market to be served. A combination of payload technologies that allow a flexible allocation of power and bandwidth to any portion of the coverage area is described. Power flexibility is achieved by a novel combination of a low-level beam-forming network and a matrix power module which ensures equal sharing of power among individual amplifiers. This eliminates the loss of efficiency and increased mass when an amplifier associated with a beam must be over-designed to meet uncertainties in power distribution between beams. The matrix power amplifier also benefits from the spreading of intermodulation products among output ports such that only a portion falls in the beam of interest, yielding lower system-level intermodulation. Flexibility in allocation of bandwidth to beams is achieved by intermediate frequency subdivision of the L-band service categories defined by ITU (AMSS, LMSS, MMSS). These spectral subdivisions are assigned to beams by an IF interconnect matrix having beam ports and filter ports as inputs and outputs, respectively. Two such filter switch matrices are required, one for the inbound L-band to feeder link transponder, and one for the outbound feeder link to L-band transponder.<<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":"133072359","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

Optical signal processing for local-access networks 本地接入网的光信号处理

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.63926

L. Kazovsky

引用次数: 0

Performance analysis of multiple-packet messages in uni-directional bus networks 单向总线网络中多包消息的性能分析

IEEE Global Telecommunications Conference, 1989, and Exhibition. 'Communications Technology for the 1990s and Beyond Pub Date : 1989-11-27 DOI: 10.1109/GLOCOM.1989.64100

C. Chao, M. Ilyas

引用次数: 3