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3rd European Conference on Satellite Communications - ECSC-3, 1993.

2-4 Nov 1993

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Displaying Results 1 - 25 of 81
  • NDA chip synchronizers for bandlimited DS/SS signals using CDMA on frequency nonselective fading channels

    Publication Year: 1993, Page(s):336 - 340
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    The authors investigate the chip synchronization for a bandlimited direct-sequence spread spectrum (DS/SS) M-PSK signal transmitted over a slowly time-varying nonselective fading channel. Two maximum-likelihood (ML) nondecision-aided (NDA) chip synchronization algorithms are derived. The first algorithm is nonchannel-aided (NCA): timing is acquired independently of the channel gain estimation. The... View full abstract»

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  • A high level satellite system planning tool

    Publication Year: 1993, Page(s):81 - 85
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    Vega have been awarded a contract to develop a software based high level planning tool for the UK Defence Research Agency. The first phase of this development was to produce an interactive simulation and model of the UK Military Satellite Communications System (UKMSCS) encompassing several different satellites, a multiplicity of different earth terminals and a core backbone of terrestrial data lin... View full abstract»

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  • Centralized management of configuration and monitor & control of a large SCPC DAMA network

    Publication Year: 1993, Page(s):419 - 423
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (232 KB)

    In the framework of the SCPC-DAMA system for satellite telecommunications, the master station (DMS) is basically in charge of the satellite circuit assignment of a call-by-call basis. Because of the size of the network the remote stations can be spread on a large geographic area; the controlling and monitoring activities are of major concern. The paper describes how the network management has been... View full abstract»

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  • Ring-TCM codes for QAM

    Publication Year: 1993, Page(s):341 - 345
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    Multilevel convolutional codes based on rings of integers modulo-4 suitable for rectangular QAM constellations are presented. Codes performing at similar or better coding gains than binary TCM codes which have similar or less complex decoders than these and which, in addition, are 90° phase rotationally invariant are reported in this paper. This means a significant improvement on channels subj... View full abstract»

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  • The BT experience of implementing 140 Mbit/s 8-PSK carriers for transatlantic cable restoration purposes

    Publication Year: 1993, Page(s):86 - 90
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (352 KB)

    For many years, the satellite communications fraternity has grappled with the problem of squeezing carriers with an information rate of 140 Mbit/s into a transponder bandwidth of 72 MHz, which has a practical transmission rate limit of around 60 MBaud (i.e. 120 Mbit/s when using the 4-phase PSK modulation technique). This paper describes the BT experience in implanting the solution agreed upon wit... View full abstract»

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  • Digital video compression-the future for satellites

    Publication Year: 1993, Page(s):29 - 32
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    The paper reviewed low bit rate digital transmission of television signals on satellites. Some of the systems aspects have been discussed and particular details of a practical satellite system already available commercially have been given. These developments, together with attention to practical design details and particularly receiver costs, will eventually result in a variety of TV broadcast sy... View full abstract»

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  • Double-layer satellite network for regional voice communications

    Publication Year: 1993, Page(s):424 - 429
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    The double layer satellite system DOLSAT is organized in two independent layers and combines a robust star-net architecture based on Intelsat IDR technology with a versatile CDMA-system in the mesh layer. This structure results from traffic statistics as expected for small regional exchange facilities. The system is well suited to connect a medium number of remote stations with a main station. The... View full abstract»

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  • Multilevel trellis MPSK codes and rotationally invariant construction

    Publication Year: 1993, Page(s):346 - 351
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    Multilevel trellis codes (MLTC) have proved to be a bandwidth efficient coding technique that can achieve high asymptotic coding gain. Using a staged decoding process, these codes permit very good trade off between performance and complexity. Rotationally invariant multilevel trellis 8PSK codes are proposed to counteract phase instabilities in a bandlimited satellite communication system. By an ap... View full abstract»

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  • Design and performance of a variable rate digital demodulator for a 23/26 GHz DRS user spacecraft transponder

    Publication Year: 1993, Page(s):289 - 293
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    This paper describes the design and the performance of a variable rate digital demodulator for a 23/26 GHz DRS user spacecraft transponder. In the Ka-band, a transmission link is provided with a bandwidth of approximately 47 MHz. On this link, from ground via a DRS satellite to a user spacecraft, any data rate between 1 kbit/s and 25 Mbit/s may be used. The variable rate digital demodulator covers... View full abstract»

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  • Interconnection of high-speed network clusters through satellites

    Publication Year: 1993, Page(s):91 - 95
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    Full network interconnections will not be possible in this century unless satellite technology is used to integrate networks. The limitations from the lack of telecommunications infrastructure in large or developing regions could be quickly overcome by satellite links joining terrestrial networks such as high bandwidth network islands. With these considerations in mind, the article presents the op... View full abstract»

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  • Developments in digital video transmission via satellite

    Publication Year: 1993, Page(s):33 - 37
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    Address issues associated with satellite transmission of digital video signals including; the demands on satellite power and bandwidth, the subjective quality of digital compressed video, and the cost implications of digital video transmission to satellite operators, earth station operators and broadcasters View full abstract»

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  • Payload for medium altitude global mobile satellite system

    Publication Year: 1993, Page(s):320 - 324
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (228 KB)

    ESA is currently studying mobile satellite systems based on MEO (medium altitude Earth orbits) for global personal communications. As a result of this study a 14-satellites constellation in circular orbits at a height of 10355 km has been chosen as the baseline. The authors present basic trade-offs of the payload design, as well as payload mass and power budgets. The selected payload makes use of ... View full abstract»

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  • Performance of concatenated trellis-coded 16QAM with pilot symbol aided technique in the presence of fading

    Publication Year: 1993, Page(s):352 - 356
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (244 KB)

    The performance of a concatenated trellis-coded 16QAM modem is presented for Rayleigh, Rician and shadowed land mobile satellite communication channels. For the concatenated coded modulation scheme, the outer code is a rate of 223/255 Reed-Solomon code and the inner code is a rate of 3/4, 8-state trellis-coded modulation (TCM). Time-multiplexed TCM codecs are used for interleaving and a pilot symb... View full abstract»

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  • Power control techniques performances evaluation in the SCPC/DAMA access scheme

    Publication Year: 1993, Page(s):294 - 300
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (344 KB)

    The paper analyses the power control problem in the case of a SCPC/DAMA satellite communication network based on a centralized control management. In particular, different possible solutions are considered both for the master station and for the remote terminal. Performances evaluation of the proposed different solutions is carried out in terms of the input power flux density (IPFD) resulting accu... View full abstract»

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  • Exploitation of synchronous digital hierarchy features to provide multidestination satellite communications

    Publication Year: 1993, Page(s):96 - 101
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (308 KB)

    The paper addresses the role that the synchronous digital hierarchy (SDH) can play in providing effective multi-destination satellite communications. SDH and its earlier partner SONET are generally considered to be appropriate to the optical fibre cable transmission domain. It shows their applicability to satellite systems and how they are well matched to that transmission media. In particular it ... View full abstract»

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  • A high quality voice coder with integrated echo canceller and voice activity detector for VSAT systems

    Publication Year: 1993, Page(s):196 - 200
    Cited by:  Papers (3)  |  Patents (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    Low bit rate speech coding research has received much attention resulting in newly developed good quality speech coders operating at as low as 4.8 kb/s. Although speech quality at around 8 kb/s is acceptable for a wide variety of applications, at 4.8 kb/s more improvements in quality are necessary to make it acceptable to the majority of applications and users. In addition to the required low bit ... View full abstract»

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  • New trends in satellite news gathering

    Publication Year: 1993, Page(s):38 - 43
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (532 KB)

    Satellite news gathering is a growing service in the application field of satellite communications. After the first years of enthusiasm with this new service the user demand asks for more customer-`tailored' system solutions. The paper presents a short retrospective regulatory affairs, steps in the next future, ancillary communication system, and compressed video and digital transmitting View full abstract»

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  • Statistical analysis of mobile channel fading of MEO communication systems

    Publication Year: 1993, Page(s):367 - 373
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (356 KB)

    Many studies have been made in order to find solutions for global satellite mobile communication systems. Medium Earth orbit (MEO) constellations of satellites, which altitudes ranging from 10000 to 20000 km, seem to be adequate trade-off to provide a continuous world wide communication service with a reduced number of satellites. The paper presents a statistical analysis of mobile channel fading ... View full abstract»

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  • The networking of dynamic satellite constellations

    Publication Year: 1993, Page(s):325 - 329
    Cited by:  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (296 KB)

    Networking issues relating to dynamic satellite constellations (DSCs) are examined. These issues are of direct relevance to personal mobile satellite communication systems. Initially an explanation is given of the baseline DSC network architecture, upon which the network examinations were based. Two approaches to user mobility management-a GPS-type positioning approach and one based on network cov... View full abstract»

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  • AEROSATEL: a closed IBS network for aeronautical communications

    Publication Year: 1993, Page(s):70 - 74
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (276 KB)

    Presents an overview of the AEROSATEL closed IBS network. The network configuration, earth station hardware and network monitoring and control aspects are presented View full abstract»

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  • Issues on the protocol definition for an integrated space/terrestrial mobile communication system

    Publication Year: 1993, Page(s):21 - 23
    Cited by:  Patents (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (220 KB)

    In an integrated space/terrestrial system for mobile communications the satellite is cooperating with a terrestrial cellular network for providing user services. Considering the basic operations of a cellular network, the authors discuss some aspects related to the definition of similar procedures for a much more complex system View full abstract»

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  • Propagation characteristics for satellite optical communication links

    Publication Year: 1993, Page(s):309 - 314
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    The authors present a model for the propagation of electromagnetic waves at optical frequencies, through atmospheric channels, with different turbulence levels. Using this model, the variation of the power at the receiver end, the rise time of the channel and amplitude fluctuation have been computed with respect to beamwidth channel thickness, and degree of turbulence View full abstract»

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  • A WAN Inter-Working Unit for satellite links

    Publication Year: 1993, Page(s):187 - 191
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (364 KB)

    Commercially available protocol implementations often perform well down to a BER of 10-6. The results presented show that a packet service may tolerate a significant further increase in the tolerated BER allowing operation down to 10-4 BER using the proposed satellite efficient link protocol implemented in an experimental WAN Inter-Working Unit (IWU). The IWU has two interfac... View full abstract»

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  • Interoperability concept for LEO satellite personal communications

    Publication Year: 1993, Page(s):357 - 361
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (244 KB)

    The fact that various cellular telephone systems already exist and satellite (store and forward or courier mode) data systems are being developed will result in eventual deployment of large families of system unique terminals. Interoperable communications between disparate terminal types may be an occasional operational requirement. A concept for providing interoperable communications among small ... View full abstract»

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  • Impact of propagation effects on an adaptive TDMA network

    Publication Year: 1993, Page(s):301 - 305
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (236 KB)

    An experimental TDMA network consisting of four stations located within different (CCIR-rain climatic zones) has been successfully operated in the 20/30-GHz frequency range. To improve system availability limited by link attenuation due to rain, an up-grade of the network by a fade countermeasure protocol is planned applying up-link power control and common resource sharing, techniques. Ideal perf... View full abstract»

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