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Digital Satellite Communications, 1995., Tenth International Conference on

Date 15-19 May 1995

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Displaying Results 1 - 25 of 100
  • Advanced communications technology satellite (ACTS) applications and experiments

    Publication Year: 1995, Page(s):159 - 166 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (460 KB)

    The ACTS satellite was designed to provide demand assigned multiple access (DAMA) digital communications with a minimum switchable circuit bandwidth of 64 kbps, and a maximum channel bandwidth of 900 MHz. It can, therefore, provide service to thin routes as well as connect fiber backbones in supercomputer networks, across oceans, or to restore full communications in the event of national or manmad... View full abstract»

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  • 20/30 GHz satellite communications: the technology is mature

    Publication Year: 1995, Page(s):152 - 158 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (488 KB)

    The paper addresses from a “strategic” point of view the inherent advantages of Ka-band satellite services as compared to C- and Ku-band systems. The analysis starts from considering Intelsat-like service requirements for four categories of applications (presently rendered at C/Ku bands): (i) trunk telephony; (ii) high capacity data services (cable restoration); (iii) VSAT and (iv) vid... 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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  • Satellite communication systems for multimedia services

    Publication Year: 1995, Page(s):690 - 695 vol.2
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    This paper proposes a satellite communication system configuration suitable for multimedia communication and discusses the requirements for the network system. In the proposed system, multi-speed digital data is multiplexed and distributed to users by satellites. The distribution data is received not only at users' homes directly but also at the head-ends of CATV systems. Users can get desired inf... 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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  • Implementation of ATM via satellite for B-ISDN

    Publication Year: 1995, Page(s):137 - 142 vol.1
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    Advances in digital signal processing and telecommunication technologies has led to the development of ATM and B-ISDN. Satellite communications systems can play an important role in the development of the initial experimental systems and also in the fully developed networks due to their features of flexible wide coverage, independent of ground distances and geographical constraints, multiple acces... View full abstract»

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  • Link enhancement for ATM over satellite links

    Publication Year: 1995, Page(s):129 - 136 vol.1
    Cited by:  Papers (1)  |  Patents (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (464 KB)

    The burst errors experienced on coded satellite links impact the operation of both asynchronous transfer mode (ATM) and ATM adaptation layer (AAL) protocols and their transport in synchronous digital hierarchy/plesiochronous digital hierarchy (SDH/PDH) frames. COMSAT has developed an ATM link enhancer (ALE), which provides significant improvement in the probability of cell discard due to header er... View full abstract»

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  • Design of an integrated protocol architecture for Micro-VSAT networks

    Publication Year: 1995, Page(s):358 - 365 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (484 KB)

    This paper proposes a voice-data integrated digital network designed for Micro-VSAT networks. The design is the result of a study performed under contract for the European Space Agency, in the framework of the development of a portable VSAT network based on the advanced access technique Bandlimited Quasi-Synchronous CDMA, operating in Ku-band (referred to as CKN in this paper). The study was inten... View full abstract»

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  • MCPC VSATs for rural network

    Publication Year: 1995, Page(s):484 - 490 vol.2
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    The multiple channel per carrier very small aperture terminal (MCPC VSAT) is ideally suited for trunk connections between a large switching centre and small exchanges in rural/remote inaccessible areas on a point to point basis in star connectivity. Utilising low bit encoding techniques for voice, the MCPC VSAT network achieves economy in satellite resources while retaining circuit quality. The de... View full abstract»

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  • Satellite onboard fast packet switch

    Publication Year: 1995, Page(s):172 - 179 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (468 KB)

    An onboard baseband fast packet switch test bed, implemented as an 8×8 switch, with input and output ports operating at 164.24 Mbit/s, was developed. The switch fabric is implemented as a data-directed space switch capable of supporting data rates of 1.6 Gbit/s. The test bed was developed to demonstrate and characterize the flexibility of an onboard fast packet switch and to gain better unde... 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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  • 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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  • Digital compression-a carrier's perspective

    Publication Year: 1995, Page(s):466 - 470 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    A great deal has been heard about digital compression over the past few days. The article deals with some of the practical issues surrounding the implementation of such equipment from a user's perspective, and highlights some of the points that the new technology raises on the satellite services agenda View full abstract»

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  • Investigation of MSK and FSK modulation schemes for single channel communications system using DSP techniques on-board low Earth orbit microsatellite

    Publication Year: 1995, Page(s):9 - 16 vol.1
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (548 KB)

    The constraints and requirements placed on modulation schemes by LEO microsatellites communications systems are summarized and followed by the introduction of an in-orbit research tool, the Digital Signal Processing communications Experiment payload (DSPE) on-board the PoSAT-1 microsatellite. The preliminary in-orbit communications experiments using PoSAT-1 DSPE are described, including optimizing... View full abstract»

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  • Improvement and application of the INTELSAT (SS)TDMA system

    Publication Year: 1995, Page(s):413 - 418 vol.2
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (456 KB)

    This paper presents the rationale for improvement of the present INTELSAT (SS)TDMA system, and describes the current INTELSAT program to achieve this goal. The role of TDMA in the INTELSAT system and the performance record and customer benefits are described. Two objectives of this program are to make low cost TDMA terminal equipment available to INTELSAT TDMA system customers, and to enhance the ... View full abstract»

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  • ACE-8PSK: band-limited 8PSK with an Almost Constant Envelope

    Publication Year: 1995, Page(s):325 - 331 vol.1
    Cited by:  Papers (2)  |  Patents (67)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (472 KB)

    8PSK modulation is of increasing interest in satellite communications applications where bandwidth efficiency is a prime concern. However, its adoption in practical systems has been limited, largely due to its increased sensitivity to channel and transmitter imperfections as compared with QPSK and other modulation schemes. In particular, band-limited 8PSK is highly susceptible to the interference ... View full abstract»

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  • Efficient support of circuit-mode and packet-mode services in micro-VSAT networks

    Publication Year: 1995, Page(s):503 - 510 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (512 KB)

    This paper studies the provision of low data rate services in micro-VSAT networks such as the bandlimited quasisynchronous CDMA VSAT system currently being developed by ESA. It presents the results of a simulation study intended to evaluate the performance impact of several system design choices. The simulated network (which is a generalization of the first-generation system planned by ESA) is req... View full abstract»

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  • Digital audio broadcasting: high-grade service quality through on board processing techniques

    Publication Year: 1995, Page(s):375 - 381 vol.2
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (292 KB)

    A digital audio broadcasting (DAB) satellite system is presented, providing optimized service and guaranteeing an high-grade quality service for some hundreds of channels. This with minimum cost of the radio set and of the broadcasting station, greatly improving the radio broadcasting service throughout the world, especially in areas where deployment of conventional relay infrastructures is diffic... View full abstract»

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  • Impact of delay on the voice transmission performance of mobile-satellite systems

    Publication Year: 1995, Page(s):96 - 100 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    This paper presents the design and analysis of an experiment, which was conducted in order to assess subjectively the impact of transmission delay on mobile voice communications. This study was undertaken using simulated end-to-end propagation delays representative of low Earth orbit (LEO) and geostationary Earth orbit (GEO) systems. From this it was concluded that “wireline-quality” a... View full abstract»

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  • Design and development of a configurable architecture for on board digital switching in regenerative payloads

    Publication Year: 1995, Page(s):72 - 78 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (480 KB)

    The paper starts from the results of the activities that have been carried out to develop an on-board processing switching unit that features a modular architecture. It shows the suitability of the developed modules to be arranged in different configurations for on-board regenerative payloads. To fit a wider range of requirements, the developed modules are proposed also with additional features an... View full abstract»

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  • Low Earth orbit microsatellites for data communications using small terminals

    Publication Year: 1995, Page(s):457 - 465 vol.2
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (548 KB)

    For more than a decade SSTL/UoSAT has been pioneering the use of microsatellites in low Earth orbits. Simple, efficient and low cost digital `store and forward' communications systems are a key element for a successful microsatellite mission. These communications payloads now form the basis of the communications links for both experimental and operational microsatellite missions and perform a rang... View full abstract»

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  • Use of satellite for digital broadcasting and interactive television

    Publication Year: 1995, Page(s):479 - 483 vol.2
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    The advances in transmission and coding technologies will allow telecommunication network operators to provide customers with high bandwidth interactive services such as video on demand (VOD), home shopping, entertainment, work at home, etc. Several solutions based on different physical layers and network architectures have been proposed for delivering interactive services. Following this trend, w... View full abstract»

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  • The development of an operational computer based satellite data broadcasting system

    Publication Year: 1995, Page(s):405 - 412 vol.2
    Cited by:  Papers (2)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    Describes the hardware and software development of a low cost, 100 kbit/sec data modem for satellite broadcasting and reception of computer disk files. Primarily developed for use as a sub-carrier on a standard FM TV transmission, the system has been adapted to operate at 128 kbits/sec utilising a user data port on an MPEG compressed digital TV channel. The modulator and demodulator printed circui... View full abstract»

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  • Digital engines-business and technological aspects

    Publication Year: 1995, Page(s):XXI - XXV vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    The digital electrotechnology having most impact within society today is provided, in various forms, via computers. Dedicated and specialized digital computations impact the everyday welfare of citizens in all nations of the world. Their commercial, financial and environmental well-being is increasingly assisted by the power of computational engines. The combined computational and communications e... View full abstract»

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  • A C-band micro-terminal

    Publication Year: 1995, Page(s):55 - 62 vol.1
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (400 KB)

    The provision of a portable C-band terminal communicating with large hub stations through an 18 MHz band of INTELSAT V transponders is investigated. The considered multiple hub network with distributed control can support up to 18 2.4 kbit/s simultaneously active users equipped with 0.8 m antennas at remote sites. The inbound and outbound carriers are spread by an appropriate factor for meeting CC... View full abstract»

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