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1995 Tenth International Conference on Digital Satellite Communications

15-19 May 1995

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Displaying Results 1 - 25 of 100
  • A low cost ready to deploy open satellite network

    Publication Year: 1995, Page(s):578 - 584 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    SESNET is a satellite communications system which can be tailored to provide voice and data channels to a wide range of users with very different traffic requirements. The modular design of its SCPC-DAMA structure allows an easy, fast and inexpensive network growth. The open architecture of the system allows an easy, fast and inexpensive integration with the terrestrial networks. For those reasons... View full abstract»

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  • INTELSAT second-generation TDMA terminal

    Publication Year: 1995, Page(s):419 - 426 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (568 KB)

    The time-division multiple access (TDMA) traffic terminals currently operating over INTELSAT satellites are rapidly becoming obsolete and difficult to maintain. The increasing use of digital circuit multiplication equipment, together with the need to ensure compatibility with synchronous digital hierarchy multiplexing, makes existing digital speech interpolation terrestrial interfaces ineffectual.... View full abstract»

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  • JOCOS: a triply geosynchronous orbit for global communications: an example

    Publication Year: 1995, Page(s):646 - 652 vol.2
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    In the last decade the development of technology to support roaming of mobile users in a cellular network has open new market frontiers that show a 30% increase per year. The spectacular growing demand for mobile communications has stimulated the satellite community to conceive innovative satellite systems based on similar technology. In fact this technology, which is able to find and interconnect... View full abstract»

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  • The interconnection of local area networks using ATM over satellite

    Publication Year: 1995, Page(s):511 - 517 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    This paper details the work undertaken at the University of Salford in both the design and development of an interface subsystem for attaching either CSMA/CD or FDDI LANs onto the ATM based satellite service. An in depth investigation into the design of both the hardware and software of this subsystem is presented together with actual performance results obtained from the demonstrator trials using... View full abstract»

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  • Making effective satellite network integration to terrestrial PSTN

    Publication Year: 1995, Page(s):585 - 590 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    Integration between terrestrial PSTN and a satellite network is the field where the ease of operation of a sat-com system is proven. A terrestrial telephone network is normally well established and when the need for a satellite telephone arises, the latter provide adequate flexibility to be easily merged into the former. This flexibility must be complemented by a user friendly approach to system o... View full abstract»

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  • Efficient transport of voice-band signals on ATM networks

    Publication Year: 1995, Page(s):115 - 120 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    The asynchronous transfer mode (ATM) is now recognized as the preferred transfer mechanism for high speed services in digital networks. The long-term goal is to offer broadband integrated services digital networks (B-ISDN); so far, the main thrust has been on the development of high speed transport for data as well as video. It is unlikely that ATM can be implemented in all locations simultaneousl... View full abstract»

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  • Proceedings ICDSC-10. 10th International Conference on Digital Satellite Communications (Conf. Publ. No.403)

    Publication Year: 1995
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (44 KB)

    The following topics were dealt with VSAT; on-board processing; mobile satellite systems; ATM/SDH; Ka-band use; video compression; intersatellite links; modulation and coding; audio and data broadcasting; TDMA; user experience; thin route/DAMA; operational aspects; multimedia View full abstract»

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  • Next generation TDMA terminal for INTELSAT system users

    Publication Year: 1995, Page(s):427 - 434 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (512 KB)

    This paper provides the technical description of a next generation (Model 520) traffic terminal under development at Hughes Network Systems, Inc. (HNS) for INTELSAT TDMA system users. The design of this terminal takes full advantage of our current TDMA terminal (Model 1020), which has been very popular with the INTELSAT and EUTELSAT system users for more than 10 years. Additional improvements in t... View full abstract»

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  • Satellite link performance characterization of 2 Mb/s IDR channels with Reed-Solomon codec

    Publication Year: 1995, Page(s):611 - 618 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (396 KB)

    One alternative for improving the performance of INTELSAT's intermediate data rate (IDR) service is to use a more robust error correction coding such as the Reed-Solomon (RS) codec. The RS codec when concatenated with the existing Convolutional encoder/Viterbi decoder of IDR modems can improve the modem performance significantly. This paper presents the results of field characterization tests carr... View full abstract»

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  • SDH in digital satellite systems

    Publication Year: 1995, Page(s):213 - 219 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    In the future the synchronous digital hierarchy as multiplexing technique between cross-connect or switches is expected to replace the current plesiochronous digital hierarchy in the networks. Satellite systems providing trunking services and interfaces with public networks shall become compatible with SDH interfaces. Also management, error performance monitoring, pointer processing, defined for S... View full abstract»

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  • Techniques for optimising satcom packet data networks

    Publication Year: 1995, Page(s):343 - 350 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (612 KB)

    Many satellite links use small satellite terminals and operate at modest data rates. It is a frequent requirement that the links supported by these terminals must maintain reasonable performance when noise on the link causes some packets to be corrupted and lost. When commercial off-the-shelf networking equipment is used with such links to support packet data exchange, the performance has been obs... View full abstract»

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  • Fade countermeasures in Ka band: application of frequency diversity to a satellite system

    Publication Year: 1995, Page(s):143 - 151 vol.1
    Cited by:  Papers (1)  |  Patents (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (620 KB)

    Some of the problems concerning the use of Ka band for satellite systems have been investigated and many fade countermeasures have been described. Frequency diversity has been analyzed and characterized in detail verifying the variability of its performance as a function of several system parameters. A satellite system utilizing frequency diversity has been dimensioned and the advantages in terms ... View full abstract»

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  • QualiView: an in-service, non-intrusive monitoring device (INMD) for call quality performance monitoring

    Publication Year: 1995, Page(s):682 - 689 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (400 KB)

    The in-service non-intrusive monitoring device (INMD) concept itself is straight forward: bridge both call directions (near-to-far and far-to-near), analyze the speech/voiceband data/fax samples to determine various performance measurements which are most telling for callers' quality of service perceptions, perform statistical analysis to understand trends and to proactively identify trouble circu... View full abstract»

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  • Simulation and analysis of the capacity of CDMA for spectrum sharing between satellite-mobile systems

    Publication Year: 1995, Page(s):203 - 207 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    This paper discusses the effect of spectrum sharing between DS-CDMA channels and conventional narrowband channels. Analyses have been performed with the view to increasing the overall spectral efficiency in the frequency band, taking into account various factors such as the proportion of overlapping, the relative location of overlapping and filtering. Spectral sharing between DS-CDMA systems is al... View full abstract»

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  • INTELSAT's traffic monitoring systems

    Publication Year: 1995, Page(s):666 - 673 vol.2
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (420 KB)

    INTELSAT utilizes a number of facilities for monitoring the performance of both its satellite transponders and the traffic they carry. There are facilities for measuring general performance such as the communications satellite monitor (CSM) and the remote spectrum analyzer (RSAN), and a specialized system for monitoring INTELSATs 120 Mbit/s TDMA system. These various systems are located at a numbe... View full abstract»

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  • Design and performance evaluation of the layer 2 signalling protocol in the ESA OBP network

    Publication Year: 1995, Page(s):187 - 194 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (536 KB)

    The paper presents the results of a simulation study, performed under contract for the European Space Agency (ESA), which evaluated the performance of the layer 2 signalling protocol in the ESA On-Board Processing Network (OBP). Two layer 2 design options were compared in the study: a general protocol based on the HDLC family, and a simplified protocol tailored to the OBP environment. In the first... View full abstract»

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  • OBP for private networks and residential users

    Publication Year: 1995, Page(s):653 - 660 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    Satellite communications networks with onboard processing (OBP) can provide interactive satellite communications with very small earth stations over a large area. This brings to small business and residential users a wide range of satellite applications, such as videoconferencing, interactive multimedia, electronic libraries and “Citizen Band Video”, making use of the inherent broadcas... View full abstract»

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  • International compressed video by satellite

    Publication Year: 1995, Page(s):250 - 260 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    NTL has been at the forefront of the development of MPEG digital video compression, launching its MPEG 1 System 2000 product in early 1993. This was the first commercial implementation of the MPEG standard for use in broadcast television applications and many organisations have since operated the system both for point to multipoint distribution to cable head-ends and also for point-to-point delive... View full abstract»

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  • A hybrid CDMA scheme and demodulator structure for KA band operation

    Publication Year: 1995, Page(s):17 - 23 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    This work derived from a study of the impact of 20/30 GHz operation on the OBP requirements for a satellite system intended to serve private user networks of small fixed terminals. As the cost of the HPA was a dominant factor we examined continuous transmission schemes and concluded that CDMA was potentially attractive as with synchronous CDMA mutual interference can be zero. Therefore no sacrific... View full abstract»

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  • Notebook satcom terminal technology development

    Publication Year: 1995, Page(s):269 - 276 vol.1
    Cited by:  Patents (18)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (680 KB)

    Comsat Mobile Communications and Comsat Laboratories have an ongoing multi-year development effort begun in 1992 to evaluate and develop the critical technologies required to meet future generation satellite systems offering handheld and laptop/notebook computer-sized satellite terminals. A critical assumption in the economic success of these future systems is the availability of a low cost termin... View full abstract»

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  • Development of inter-orbit communications equipment of COMETS/NASDA

    Publication Year: 1995, Page(s):304 - 310 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (408 KB)

    The National Space Development Agency of Japan (NASDA) plans to launch the COMmunications and broadcasting Engineering Test Satellite (COMETS) by the H-II launch vehicle in February, 1997. The profiles of COMETS are shown. The aim of COMETS is to develop and to experimentally demonstrate new technologies in the fields of communication and broadcasting using Ka-band equipment; inter-orbit communica... View full abstract»

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  • Improved INTELSAT IDR and IBS services

    Publication Year: 1995, Page(s):34 - 40 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    In response to the concerns of several major customers about the quality and availability of INTELSAT IDR (intermediate data rate) services and IBS (INTELSAT Business Services), COMSAT Laboratories designed and developed an outer codec and demonstrated its capabilities. The improved system was proposed to the INTELSAT Board of Governors in early 1992 and was approved in December 1992. The paper de... View full abstract»

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  • An initiative for conformance ATM-networks relying on satellite-links

    Publication Year: 1995, Page(s):518 - 523 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    This paper presents the preliminary results of an initiative, supported by three public network operators (PNO)s-Telefonica, Swiss Telecom PTT and Telia-and the EUTELSAT organisation. The physical and ATM layer tests were carried out both in the laboratory and via a satellite. During the field trials, the measurements were performed at the earth station and through ATM nodes. Multimedia services e... View full abstract»

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  • Laboratory and field tests of the new INTELSAT standard DCME

    Publication Year: 1995, Page(s):591 - 598 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    This paper describes the testing of the DCME equipment based on the INTELSAT IESS-501 specification. The test plan, test configuration and measurement equipment are described. Then, the major test results are presented and inter-operability related issues are discussed. On-going or recently completed single-vendor field trials are described and the plan for a multi-vendor field trial is briefly ad... View full abstract»

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  • CADENZA: the World's first ATM switch in the sky

    Publication Year: 1995, Page(s):121 - 128 vol.1
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (392 KB)

    The system described makes possible the immediate deployment of a satellite-based ATM switch, offering full cell-by-cell connectivity for private networks or for complementing the terrestrial IBCN. By using a conventional transparent satellite, the system avoids the costs, risks and delays associated with new payload development; and with so little equipment in orbit to fail, and none to be supers... View full abstract»

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