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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
  • CDMA Ku-band network for portable terminals

    Publication Year: 1995 , Page(s): 366 - 373 vol.1
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (384 KB)  

    ARCANET is a Ku-band VSAT network intended to provide personal communications utilising either fixed or suitcase portable terminals. The ARCANET system utilizes an innovative satellite access technique, band limited quasi-synchronous CDMA, together with state-of-the-art digital signal processing components and algorithms. The result is a very effective cost-performance system that provides data, fax, and toll quality phone communication to the end user. The system architecture, configuration and services are described, giving an insight into the network management as well as the characteristics of the main network elements View full abstract»

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  • Application of the access network concept of ETSI to the on-board processing system of the European Space Agency (ESA)

    Publication Year: 1995 , Page(s): 167 - 171 vol.1
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    This paper describes the application, to the onboard processing (OBP) system of the European Space Agency (ESA), of the access network (AN) concept and related protocols which have been standardised by the European Telecommunication Standardisation Institute (ETSI). The advantages of this approach as well as mandatory modifications to the ETSI protocols are listed. The mission of the OBP system is to offer ISDN (integrated services digital network) services to the European continent via a geostationary satellite. These standard services, providing connections via primary rate access (PRA) and basic rate access (BRA), are complemented with services for which satellites have a long tradition, i.e. multi- and broad-cast services but at multiples of 64 kbit/s View full abstract»

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  • Low sidelobe simple antenna and efficient multiple access method for realization of USAT system

    Publication Year: 1995 , Page(s): 47 - 54 vol.1
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    The paper proposes a Ku-band ultra small aperture terminal (USAT) network offering various kinds of multi-media communications services. The USAT network proposed will accelerate the diffusion of the multimedia communications by enhancing the features of satellite communications such as multiple access, simultaneous distribution and wide service area. Furthermore, the USAT network is expected to be used in various kinds of service applications by a huge number of users owing to low-cost and easy installation of USAT terminal. The USAT antenna aperture size assumed in the paper is around 50-cm that is relatively smaller than the conventional VSAT antenna of around 1.2-m. As the key technologies for the realization of the USAT system, a low sidelobe simple antenna which meets ITU-R Recommendations, a carrier power spectrum density reduction technique for suppressing interference levels towards adjacent satellite systems, and an efficient multiple access method which can accommodate a huge number of USAT terminals with the higher throughput-delay time performance are proposed View full abstract»

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  • Satellite modem equipment using advanced coding and modulation techniques for current and potential INTELSAT services

    Publication Year: 1995 , Page(s): 24 - 33 vol.1
    Cited by:  Patents (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    Higher-order modulation schemes like 8PSK combined with powerful channel coding techniques like trellis coding and conjugateness Reed-Solomon coding, have been demonstrated in the INTELSAT study INTEL-1268 to achieve a higher bandwidth efficiency compared to QPSK with conventional coding. Almost error-free transmission (BER<10-10) is demonstrated with an engineering model, for Eb/No>5 dB with QPSK modulation, rate-3/4 convolutional code conjugateness with RS code according to IESS-308 (IDR), and for Eb/No>6 dB with 8PSK modulation, rate-2/3 trellis code conjugateness with a (255,235,10) RS code. The following efficiencies are obtained: QPSK: (rate 3/4 Viterbi plus RS coding). Efficiency=1.15 bit/s/Hz and 8-PSK: (rate 2/3 trellis plus RS coding). Efficiency=1.54 bit/s/Hz. The overall transmission delay for a typical 2 Mbps carrier is: QPSK: (rate 3/4 Viterbi plus RS coding). Delay=3 ms (@ 2.048 Mbps) and 8PSK: (rate 2/3 trellis plus RS coding). Delay=10 ms (@ 2.048 Mbps). The feasibility of fully software switchable and programmable QPSK/8PSK modem/codec equipment has been demonstrated. Price estimates for this switchable QPSK/8PSK modem/codec equipment show excellent price/performance ratios for this new type of equipment View full abstract»

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  • Evaluation of voice codec performance for the Inmarsat mini-M system

    Publication Year: 1995 , Page(s): 101 - 105 vol.1
    Cited by:  Papers (3)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (268 KB)  

    In this paper the method and results of a subjective evaluation are presented which was conducted in order to select a new speech codec for the Inmarsat mini-M system. The mini-M system is designed to provide the next generation of global, notebook-sized satellite terminals for transportable, land-mobile and maritime voice, facsimile, and data communications. Overall, six different codecs operating at a combined source and channel rate of 4.8 kbit/s were evaluated in a series of six subjective tests. From this, it was concluded that one codec was able to deliver performance that is equivalent to, or better than, the IS-54 full-rate digital cellular 8 kbit/s VSELP codec, and was selected for use in the mini-M system 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
    Save to Project icon | Click to expandQuick Abstract | 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 addressed 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)
    Save to Project icon | Click to expandQuick Abstract | 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 developments in VSATs have made it possible to provide basic telephone services to rural/remote areas. In India, about 80% of our population lives in rural, remote sparsely populated areas where presently there is no basic telephone service available. The geographic remoteness, hilly hostile terrain requires the installations of costly transmission lines to bring basic telephone services to these underdeveloped areas. The low population density and poor economic conditions makes it difficult for the service provider to justify the economic investment to bring basic telephone services to these areas. In the MCPC VSAT network as the name implies, several information channels are multiplexed and sent on a single satellite carrier frequency. In a rural environment, where a few information channels are required for communication, the MCPC VSATs network system would provide the best economy. This satellite based telecommunication network provides all the basic services such as telephone, fax and data transmission View full abstract»

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  • Advanced communications technology satellite (ACTS) applications and experiments

    Publication Year: 1995 , Page(s): 159 - 166 vol.1
    Save to Project icon | Click to expandQuick Abstract | 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 manmade disasters. Service can also be provided to terrestrial and airborne mobile users. The ACTS satellite has met its design requirements and its architecture has been verified by the experiments completed so far. ACTS has paved the way for the use of hopping spot beams, the use of demand assigned on-board switching, the use of Ka band, and the introduction of high bandwidth channels. These features will result in lower cost and wider availability, especially in isolated areas View full abstract»

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  • The application of wide area diversity techniques to Ka band VSATs-simulated and experimental observations

    Publication Year: 1995 , Page(s): 41 - 46 vol.1
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (340 KB)  

    Spracklin et al. (1993) reported on the design of a wide area diversity Ka-band VSAT network that has been extensively simulated in software as well as having been constructed and tested using an innovative hardware fade simulator that enables the behaviour of the system under reproducible propagation conditions to be examined. The present paper reports on the performance of the system using both simulated results as well as those taken from a hardware fade simulator. It shows that spatial diversity techniques, when used in conjunction with data networks, can provide Ka band users with significant improvements in service, particularly when reliability and availability are of importance 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)
    Save to Project icon | Click to expandQuick Abstract | 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 sacrifice in bandwidth occupancy is needed and the `demultiplexer' complexity is comparable to that for FDMA consisting of a FFT type processor involving only additions. A hybrid approach which reduces the peak processing requirement is the MF-CDMA scheme in which each 2 Mb/s carrier is shared using CDMA with different spreading factors but a common chip rate. This scheme is simple in demultiplexing, allows variable rate transmissions and avoids the synchronisation problems in a pure CDMA scheme View full abstract»

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  • A hybrid system for global communications

    Publication Year: 1995 , Page(s): 559 - 565 vol.2
    Cited by:  Patents (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (272 KB)  

    The communications industry of the twenty-first century will be facing critical challenges in providing a readily accessible worldwide personal communications fiberless network. In addition, this network must have features like transparency to all protocols, bandwidth on demand, instant access to all information through databases, high-speed links, and be cost effective and maintenance-free. This paper will explore current and future consumer requirements for global communications. The consumer needs will be examined against the current available wireless and satellite technologies. This paper will discuss a hybrid communication system. A hybrid network appears to be the only acceptable option for consumers and providers, as it will meet all of the above listed criteria. The hybrid solution will evolve from PCS/PCN and digital satellite communications. The PCS/PCN infrastructure will be weighed against the existing satellite network. A simulation model depicting this infrastructure will be presented. The results of this simulated model will be tabulated. Similar results will be presented using a satellite model. A comparison will show how these two technologies can be married to produce the hybrid result for consumers as well as providers. Frequency allocation and bandwidth utilization will be addressed View full abstract»

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  • A C-band micro-terminal

    Publication Year: 1995 , Page(s): 55 - 62 vol.1
    Save to Project icon | Click to expandQuick Abstract | 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 CCIR recommendations on off-axis emission and interference to other satellite systems. Link budget tables are provided and implementation considerations are addressed 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
    Save to Project icon | Click to expandQuick Abstract | 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” and “communications-quality” circuits differ as regards the perception of voice transmission performance as a function of delay View full abstract»

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  • The impact of miniaturized RF technologies on payload architectures of future digital communications satellites

    Publication Year: 1995 , Page(s): 637 - 645 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (780 KB)  

    This paper addresses the impact of miniaturized RF technologies on emerging communications satellite payload architectures with microwave switching, onboard signal regeneration, and multiple-beam operation with reconfigurability and steering. RF hardware miniaturization using gallium arsenide (GaAs) monolithic microwave integrated circuits (MMICs) not only makes some of these complex systems feasible, but offers the additional advantages of improved performance, enhanced reliability, and significant size and weight reduction. GaAs MMIC components have been space-qualified and have been flown or are planned to be flown on operational spacecraft. In addition, several transponder subsystems for onboard satellite applications have been successfully demonstrated using GaAs MMIC technologies. This paper also discusses a generic payload architecture for future digital satellite communications and presents key technology implementation issues and examples for miniaturized RF subsystems View full abstract»

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  • Adaptive multiple access protocols for VSATs providing voice/data services and ATM interconnection

    Publication Year: 1995 , Page(s): 351 - 357 vol.1
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    We discuss an adaptive multiaccess scheme that, when applied to a VSAT satellite network, could efficiently accommodate traffic consisting of short, interactive data messages, longer file transfers and voice calls. This enables a large number of users to share the satellite channel. The difficulties associated with the introduction of speech are discussed and ways to deal with these are suggested, so that VSAT systems become able to provide a wide range of multimedia services to geographically dispersed users. We conclude our discussion by turning our attention to the need for VSATs to become compatible with the emerging ATM technology and thus provide a way of remote connection of thin route users to the B-ISDN 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)
    Save to Project icon | Click to expandQuick Abstract | 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 broadcast function of a satellite. This paper presents an overview of this market potential and of the technical concept of a high capacity OBP system, addressing the implications of the application scenarios and user groups on the OBP system design and implementation. This is followed by a discussion of the user traffic stations and the overall communication control techniques and a presentation of a representative 20/30 GHz payload design View full abstract»

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  • Self interference in non geostationary satellite systems

    Publication Year: 1995 , Page(s): 290 - 297 vol.1
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (436 KB)  

    By early 2000, several non geostationary satellite mobile communication systems will be in operation. The frequency bands allocated by the ITU-R to the Mobile Satellite Service (MSS) being scarce, such systems will be allowed to operate only in narrow frequency bands, not large enough to allow them, in the absence of frequency reuse, to cope with the traffic generated by the total number customers. Therefore, the implementation of frequency reuse will be mandatory. The implementation strategy will have to consider reducing as much as possible the system self-noise generated by the interference between spot beams reusing a common frequency band. The important parameter is the ratio C/I between the useful received carrier power on a mobile-to-satellite or satellite-to-mobile link and the overall contribution at the receiver input of interference power generated by other links. This ratio depends on the system characteristics, such as type of orbits, number of satellites in the constellation, antenna radiation patterns, etc. The paper presents a method for calculating the ratio C/I, and the results obtained for two types of constellations. One is a 48 Low Earth Orbit (LEO) constellation, the other is a 12 Intermediate Circular Orbit (ICO) constellation. The results are displayed in the form of maps with C/I areas about the geographical location of a mobile within which a given value of C/I is guaranteed for a given percentage of time for the uplink or the downlink. These results are of paramount importance for designing subsequently a frequency reuse policy View full abstract»

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  • Comparison of coherent and non-coherent modulation schemes for low-data rate hand-held satellite terminals subject to high phase noise

    Publication Year: 1995 , Page(s): 339 - 342 vol.1
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (184 KB)  

    The object of this paper is to compare the performance degradation of coherent and non-coherent modulation schemes for low data rate transmissions in the presence of oscillator phase noise. The effect of phase noise on coherent binary phase shift keying (CPSK), differential binary phase shift keying (DPSK) and non-coherent orthogonal M-ary frequency shift keying (MFSK) has been considered. Results are presented in the form of bit error rate (BER) versus Eb/No plots. It has been shown that in noncoherent schemes MFSK is more robust than DPSK and CPSK performs better than either noncoherent scheme when the correct choice of optimum noise bandwidth of the phase locked loop (PLL) in the carrier recovery circuit is made. It is assumed that there is no cycle slipping in the CPSK demodulator. However, for hand-held technology which requires low complexity and low cost receiver structure, a noncoherent scheme may be more attractive, and hence, MFSK can be considered to be more suitable for hand-held satellite terminals 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
    Save to Project icon | Click to expandQuick Abstract | 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) videoconference. Migration of these services to 20/30 GHz is discussed assuming system parameters derived by ITALSAT (Italian domestic satellite programme) experience, and extrapolating equipment costs for both space and ground segments. Results show a fairly promising cost perspective in favour of Ka architectures. Some lessons learned from the 20-year experience we have gained on Ka-band systems makes it possible to outline some design guidelines that can be useful in developing Ka-band satellite systems of the year 2000 View full abstract»

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  • An overview of mobile satellite systems and their evolution towards satellite personal communication networks

    Publication Year: 1995 , Page(s): 435 - 441 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    The paper reviews the evolutionary trend from mobile to personal satellite communications. In addition to summarizing technical/market parameters of present-day (GEO) Mobile Satellite Systems (MSS) and MSSs under development (INMARSAT Network, ESA PRODAT and MSBN, OmniTRACS/EutelTRACS, American and Asia-Pacific Systems,....), an attempt is made to identify critical system/service aspects related to the deployment of personal satellite communications. Such aspects substantially deal with equipment standardization and type approval, frequency spectrum allocation and assignment (i.e. licensing), mutual recognition of licences, multiple-entry provision and so forth. The present situation of “little”, “big” and “super” LEOs is depicted, identifying issues to be addressed when designing and implementing satellite personal communication networks (S-PCN). Inmarsat plans to deploy the “Standard-P” system are also indicated View full abstract»

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  • Incorporating voice telecommunication with VSATs

    Publication Year: 1995 , Page(s): 497 - 502 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (272 KB)  

    To meet a growing need for voice telecommunication over VSATs, AT&T Tridom and AT&T Bell Laboratories developed the voice link module (VLM). By utilizing state of the art code excited linear prediction (CELP) compression techniques, the VLM is able to compress the voice signal down to 8 kbits/second or 4.8 kbits/second with a slight degradation in voice quality. The voice compression is combined with a flexible interface that supports two lines which may be configured for station or office connections. In addition, network software was added to support routing of the calls based on DTMF or dial pulse (DP) dialing. The combination of the high quality voice compression, flexible interface, and network software produced a unit that almost transparently supports voice telecommunication over VSAT circuits View full abstract»

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  • The quality challenge...now and for the future [satellite communication]

    Publication Year: 1995 , Page(s): 551 - 558 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (600 KB)  

    Addressing the fact that a quality revolution is taking place within the contemporary network operators' community, this paper demonstrates by example that the immediate future is teeming with new applications, services, and network trends demanding a much higher level of quality from satellite links than is now being provided by many satellites. Discussion focuses on how satellite resource providers are responding to customers' needs with a multi-pronged strategy incorporating advanced ground segment and spacecraft technology; participation in development of new, internationally recognized performance standards; demonstration of the feasibility of satellites for new digital network services; and development of satellite-friendly protocol specifications for end-to-end open networks. The conclusion emphasizes that through these ongoing substantial and tangible efforts, today's space segment resource providers, working with their customers to meet the quality challenge, will secure a major role for satellites in tomorrow's seamless networks of multimedia data exchange View full abstract»

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  • Study on interference between non-GSO MSS gateway station and GSO FSS earth station under reverse band operation

    Publication Year: 1995 , Page(s): 282 - 289 vol.1
    Cited by:  Papers (2)
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (476 KB)  

    The reverse band operation of feeder links for a non-GSO mobile satellite service (MSS) system is considered to be one of viable methods in sharing frequency bands with a GSO fixed satellite service (FSS) system. In this operation, the up and down link frequency bands of a non-GSO MSS system use the down and up link frequency bands of a GSO FSS system. The paper describes interference characteristics between a non-GSO MSS gateway station and a GSO FSS earth station, under the implementation of reverse band operation View full abstract»

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  • Fault tolerant on-board switches for ATM

    Publication Year: 1995 , Page(s): 88 - 95 vol.1
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (372 KB)  

    Reliability of any on-board ATM switch depends on providing redundant paths within the switch. This paper reports on simulated fault injection in a multistage ATM switch based on the augmented shuffle exchange network. Results indicate that an acceptable fault tolerance and performance can be achieved with reasonable buffer sizes at each switching node View full abstract»

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  • Global digital satellite highway

    Publication Year: 1995 , Page(s): 696 - 701 vol.2
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (344 KB)  

    This paper examines various current and future digital satellite technologies, including the future of fiber and cable systems in relation to PCS/PCN. The paper presents consumer requirements in domestic applications, as well as in business environments, and a model suitable for most new technologies such as ISDN and SONET is examined and discussed. For this paper's purpose, ISDN stands for integrated “satellite” digital network and SONET as “satellite”/optical network. This paper examines the potential use of low orbit satellites, satellite to satellite communications, DBS (direct broadcasting satellites) and frequency hopping techniques for current and future needs. The on-board switching and processing techniques are considered. Mobile satellite stations will become a wave of the future. Multimedia transmission, ATM, interactive voice, data and video via satellite networks are examined. A marketing summary for future digital satellite business is provided, and the VSAT market is examined. TDMA and CDMA technologies, with respect to growing demand for spectrum, are discussed. New earth station products in antenna, LNAs, HPAs, and modems are examined. Several company mergers are discussed, as well as what they mean for consumers. Analytical research data, facts, findings and future prediction models and assumptions are used by the author to show how satellites will be the dominant communications superhighway for all View full abstract»

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