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SBT/IEEE International Symposium on Telecommunications

3-6 Sept. 1990

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Displaying Results 1 - 25 of 117
  • SBT/IEEE International Telecommunications Symposium. ITS '90 Symposium Record (Cat. No.90CH2901-7)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (588 KB)
    Freely Available from IEEE
  • Bend losses in rectangular dielectric waveguides with three dielectric layers

    Publication Year: 1990, Page(s):55 - 57
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    Radiation losses due to the curvature in rectangular optical dielectric waveguides with a step index of refraction profile in the upper and lower faces are examined. Expressions are obtained for the propagation constants along the x and y directions of the waveguide, for the conversion coefficient and for the attenuation coefficient. Appreciable radiation loss reduction compared ... View full abstract»

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  • Leaky bucket analysis for ATM networks

    Publication Year: 1990, Page(s):498 - 502
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The authors investigate input rate control in ATM (asynchronous transfer mode) networks. More specifically, they focus on the policing mechanisms, whose function is to assure that the sources abide by their initial specification. They study one such mechanism, the leaky bucket, and use the uniform arrival and service model, as well as simulation to study its effectiveness in bursty traffic. They s... View full abstract»

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  • A 400 Mbps multimedia LAN

    Publication Year: 1990, Page(s):250 - 254
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    A 400 Mb/s multimedia LAN (local area network) with a slotted-ring architecture is described. This LAN provides communication network functions necessary for multimedia communication for offices, plants, and campuses. The LAN features integration of multiple media such as voice, data, image, and video; and interconnection of low- to medium-speed LANs. The authors also discuss the future of multime... View full abstract»

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  • Extension of the data capacity of the European D2-MAC direct broadcasting satellite system

    Publication Year: 1990, Page(s):382 - 387
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Two methods for inserting an additional data signal into the standard D2-MAC (multiplexed analog components) signal are presented. Specifically, two methods for doubling the data rate-one using FDM and the other TDM-are proposed and investigated by computer simulation. These two proposals are compatible with the existing D2-MAC system if-in the case of FDM (frequency division multiplexing) the ADS... View full abstract»

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  • Security in value added networks-security requirements for EDI

    Publication Year: 1990, Page(s):361 - 365
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The author describes the security requirements for the electronic data interchange (EDI) service. The existing security services and mechanisms of X.400 are evaluated in view of the EDI security requirement. Specific security services which appear to be a necessary part of the EDI model are briefly described. The work presented is based on the security concepts in the ISO/IEC JTC1/SWG-EDI document... View full abstract»

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  • On the performance of a packet switch with twin optical transmitters

    Publication Year: 1990, Page(s):49 - 54
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A packet switch based on electrooptical technologies is presented. It is composed of N VLSI chips which interface the input and output links with the internal optical interconnection network. Its simulation, when loaded with homogeneous input and output traffic, showed that two packets at a time must be first extracted from each input buffer and then transmitted on the optical interconnec... View full abstract»

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  • High definition TV: its history and perspective

    Publication Year: 1990, Page(s):541 - 545
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    The author presents a historical review of the introduction of the modern advanced television systems (ATV) such as HDTV and EDTV (high-definition and enhanced-definition TV). Particular attention is given to the system of the Japanese Broadcasting Company (NHK), international polemics on HDTV, and future prospects in this area (with emphasis on the Brazilian situation) View full abstract»

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  • A neural network controller for a high-speed packet switch

    Publication Year: 1990, Page(s):493 - 497
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A neural network implementation of an input access scheme in a high-speed packet switch for broadband ISDN (integrated services digital network) is presented. In this switch, each input maintains a separate queue for each of the outputs, thus n2 input queues in a (n×n) switch. Using synchronous operation, at most one packet per input and output will be t... View full abstract»

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  • A new approach for enhancing the throughput capability of a synchronous bus LAN

    Publication Year: 1990, Page(s):243 - 249
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    An original media access protocol called CAST (counting access to synchronous time slots) is proposed. This protocol can be implemented over a synchronous bus local area network (LAN). CAST uses a simple algorithm by which each station can recognize its turn of access by counting either the number of data packets or the number of idle pulses sent from all preceding stations. The throughput versus ... View full abstract»

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  • Digital group demodulation systems for multiple QPSK carriers

    Publication Year: 1990, Page(s):377 - 381
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    A novel complex-input-complex-output transmultiplexer (TMUX) algorithm is derived with application to quadrature modulation schemes for use in the area of satellite onboard processing. The proposed approach exploits an inherent property of the all-zero lattice filters whereby two reverse polynomial all-zero filters are simultaneously derived. This property is coupled to a similar property requirem... View full abstract»

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  • ISDN-ISUP interworking-a critical view

    Publication Year: 1990, Page(s):355 - 359
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    It is pointed out that the interworking between the ISDN (integrated services digital network) user-network interface layer 3 protocol and the SS7-ISUP (ISDN user part) protocol is not straightforward, in spite of the fact that ISUP was developed to support ISDN. Three basic criteria for designing two protocols, such that their interworking is simplified, are presented, and it is shown that the IS... View full abstract»

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  • A packet compression/decompression approach for very high speed optical networks

    Publication Year: 1990, Page(s):38 - 48
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    A technique to produce time-compressed optical packets for transmission over an ultra-high-speed optical network is proposed and analytically studied. The technique employs two recirculating optical loops per network node, one to optically compress a fully formatted electronic packet for transmission onto the network and one to electronically expand such a packet upon reception. Depending upon the... View full abstract»

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  • Carrier recovery performance in PSK systems using transmission pulses with a square root raised cosine spectrum

    Publication Year: 1990, Page(s):535 - 540
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A general expression is presented for the Mth power carrier tracking loop loss. This expression is applied to assess the performance of Costas-loop type schemes in binary PSK (phase shift keying) and quadrature PSK systems, in which transmission pulses have a square-root raised-cosine spectrum and matched filters are used in the receiver. Numerical results illustrate performanc... View full abstract»

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  • Performance comparison of four MAC protocols for integrated MANs

    Publication Year: 1990, Page(s):104 - 112
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    The performance of four different MAC (medi access control) sublayer protocols proposed for applications in extended local area networks and/or metropolitan area network (MANs) integrating different types of traffic are compared. The four protocols are Expressnet, Fasnet, QPSX (or distributed queue dual bus-DQDB), and FDDI-II (fiber distributed data interface II). Performance results in terms of a... View full abstract»

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  • Survey of unified switching techniques for integrated-service networks

    Publication Year: 1990, Page(s):338 - 344
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    The authors survey proposals for future integrated-service networks, with emphasis on unified approaches which employ a single switching technique across the entire network bandwidth. It is noted that the two most promising unified approaches are burst and fast packet switching. Burst switching is a circuit switching-based approach which allocates channel bandwidth to a connection only during the ... View full abstract»

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  • Propagation characteristics of short-range radio links at 60 GHz for mobile intervehicle communication

    Publication Year: 1990, Page(s):212 - 216
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    It has been shown that a transmission range of 500 m with direct line of sight is achievable at 60 GHz with directional antennas and a transmission power below 2 W. If the line of sight is obstructed by trees, buildings, etc., communication is possible only within a drastically reduced distance. The channel will be non-time- and non-frequency-selective for a bit rate around 1 Mbit/s. The various p... View full abstract»

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  • FEC coding for RH/MFSK multiple-access spread spectrum systems

    Publication Year: 1990, Page(s):271 - 275
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Forward error control (FEC) coding for frequency-hopping multiple frequency shift keying (FH/MFSK) multiple-access systems is analyzed, taking into account synchronous as well as asynchronous other-user interference. For both cases capacity and cut-off-rate are investigated and exact expressions for the basic system parameters are derived. Various types of FEC codes are considered. Systems employi... View full abstract»

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  • Evaluation of filtering effects on optical BPSK systems using external cavity semiconductor lasers

    Publication Year: 1990, Page(s):21 - 25
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    The performance of an optical BPSK (binary phase shift keying) heterodyne system using external-cavity semiconductor lasers and a squaring loop carrier recovery circuit is evaluated theoretically via an analytical method. The method is based on the Gram-Charlier series and takes into account the effect of filtering on the baseband signal disturbed by non-Lorentzian phase noise from external-cavity... View full abstract»

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  • ATM based B-ISDN access signalling

    Publication Year: 1990, Page(s):488 - 492
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    A proposal for a preliminary signaling system, which handles ATM (asynchronous transfer mode) point-to-point connections between two users or between a user and a specialized node is discussed. A specialized node supports services which require centralized resources within the network, such as connectionless or multimedia services. An example of this preliminary signaling protocol, which has been ... View full abstract»

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  • PC workstation for Ethernet monitoring and management

    Publication Year: 1990, Page(s):568 - 570
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    The authors present a monitoring and management workstation for IEEE 802.3 networks (Ethernet) based on a PC-AT. The monitor performs traffic analysis, detects active machines in the network, maintains a network database with information regarding network topology and machines, filters specific packets or protocols, and can also work as a traffic generator. The system has a user friendly interface... View full abstract»

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  • The double-slot slotted ring protocol (DSR)

    Publication Year: 1990, Page(s):238 - 242
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The DSR protocol combines a multilevel priority and fairness guarantee mechanism over a destination-release slotted ring. The fairness mechanism ensures fair bandwidth division within each priority level and operates through a distributed reservations algorithm entirely within the media-access control layer. In common with other destination-release slotted rings, the DSR protocol can offer network... View full abstract»

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  • Effect of channel distortions in the performance of digital transmission systems with QAM modulation

    Publication Year: 1990, Page(s):297 - 301
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    Analytical expressions for mean square and peak values of the intersymbol interference in QAM (quadrature amplitude modulation) digital transmission systems with some particular channel transfer functions are derived. Linear, quadratic, cubic, and sinusoidal channel amplitude responses are considered. Performance degradation curves corresponding to these distortions are obtained using a computer p... View full abstract»

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  • Varshamov-Gilbert bounds for generalized concatenated codes in Euclidean space

    Publication Year: 1990, Page(s):1 - 4
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The author suggests the Varshamov-Gilbert bound as a method for evaluating and comparing various possible inner codes. The advantage is that in this way an evaluation can be obtained which is more or less neutral as far as the choice of outer code is concerned. A few examples are evaluated. It is concluded that set partitioning and generalized concatenation provide excellent possibilities for cons... View full abstract»

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  • Optimal multi-h phase codes for full response continuous phase signaling

    Publication Year: 1990, Page(s):509 - 513
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Multi-h full response CPM (continuous-phase modulated) signals are analyzed at preselected numbers of states in contrast to the standard method of analyzing them at preselected numbers of modulation indices. Optimal multi-h phase codes which produce the highest minimum Euclidean distance are presented according to the number of states. Three orders of multi-h signaling are considered in the optima... View full abstract»

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