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
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    Freely Available from IEEE
  • Control aspects of a TDMA system for passive optical networks

    Publication Year: 1990, Page(s):33 - 37
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    The authors describe a time-division multiple-access (TDMA) system developed at British Telecom Research Laboratories for telephony over passive optical networks (TPON). The system is called the TPON Bit Transport System (BTS). A bit-interleaved technique coupled with efficient control protocols facilitates the design of reliable, low-complexity, and low-power-consumption TPON hardware at both hea... View full abstract»

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  • Signal statistics from a LMSS propagation experiment in Europe

    Publication Year: 1990, Page(s):227 - 232
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    A land mobile satellite system (LMSS) experiment was performed within the framework of ESA's PROSAT phase II program in order to analyze the dominant propagation factors in Europe. The measurements were made using a van as the mobile platform and the MARECS satellite as the 1.5-GHz signal source. Various environments in Spain, France, and Sweden were selected. Similar tests took place along the Sp... View full abstract»

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  • An architecture and implementation for an FDDI MAC concentrator

    Publication Year: 1990, Page(s):255 - 259
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The authors present an architecture and implementation for an FDDI (fiber distributed data interface) concentrator with media access control (MAC) sublayer support. The architecture calls for a distributed implementation of the SMT CMT (station management connection management) for the concentrator. The main features include microcontroller-based physical connection management, configuration manag... View full abstract»

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  • Signal theory for SONET STM-1

    Publication Year: 1990, Page(s):26 - 32
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    The authors discuss a signal theory approach to SONET fundamental operations: (1) multiplexing of payloads, section path overheads into a SONET structure; (ii) scrambling; and (iii) conversion into a line signal. The CCITT recommendations are taken as reference, but the formulation is sufficiently general to include the operations STS of US standards. In particular, the following sequence of opera... View full abstract»

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  • Site-diversity performance at Ku-band in Peru

    Publication Year: 1990, Page(s):222 - 226
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Results of a propagation experiment conducted at a low latitude location are presented. The experiment was designed to address the lack of measured data, at Ku-band frequencies and above, from tropical regions where there is a high incident of rainfall. Sky noise at 11.6 GHz and rainfall measurements were made at two sites separated by 30 km. Both single-site and site-diversity results in... 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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  • 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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  • Approximate solution of closed queueing networks using mathematical formulae

    Publication Year: 1990, Page(s):172 - 175
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    A practical method which gives the approximate solution of product form closed queueing networks is developed. The starting point is the integral representation of the normalization constant G. This approach was first used by Mitra et al. (1982). A conceptually simpler solution is proposed. It follows that the memory space requirements are dramatically reduced and the processing time is q... 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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  • A comparison between experimentally observed and simulated behaviors of XPD in frequency-reuse LOS links

    Publication Year: 1990, Page(s):217 - 221
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    A simulation model of multipath propagation is used to characterize the relationship between the cross-polarization discrimination and the co-polar attenuation in frequency-reuse line-of-sight links. The behavior of several links are then simulated, and the results are compared with measurements, to test the prediction capability of the model View full abstract»

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  • Resource management in a hierarchical network

    Publication Year: 1990, Page(s):563 - 567
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    A distributed algorithm for resource management in a hierarchical network is introduced which uses dynamic information about the system state in local and wide area networks. The algorithm uses broadcast information to make decision about process transfer and message routing, considering processor availability and system security. The algorithm establishes a path from the source to the destination... 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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  • Optimum alternative routing strategy for mobile radio systems

    Publication Year: 1990, Page(s):414 - 419
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The hexagonal shape of the cells in a mobile radio system is considered as an ideal model. In practice the borders between cells are not clearly defined, but are fuzzy. If a mobile is near a cell boundary, it may well have adequate communication with more than one base station. This property has already been used by the authors to define five alternative routing techniques, whose performances were... 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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  • 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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  • 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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  • Implementing Signalling System No.7 in TROPICO RA system

    Publication Year: 1990, Page(s):137 - 142
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    The authors describe implementation principles and practical arrangements for introduction of the Signalling System No.7 in the TROPICO-RA switching office. The adopted solution allows an easy realization while meeting requirements for performance, service and technological evolution. TROPICO-RA is a digital stored program controlled switching system which is presently at its development stage at ... View full abstract»

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  • Queuing analysis of a shared buffer strategy for transport-layer connections

    Publication Year: 1990, Page(s):166 - 171
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The performance of transport-layer connections with buffer sharing is investigated. The authors consider the scenario of multiple sender hosts and a single receiver host which are connected through a transport network. Application-layer processes in the sender hosts generate messages which are transferred to a peer process in the receiver host. Messages are transferred over window flow-controlled ... View full abstract»

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  • Polarization shift keying: an efficient coherent optical modulation

    Publication Year: 1990, Page(s):14 - 20
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    Multilevel digital coherent optical modulation schemes based on the state of polarization of a fully polarized lightwave are proposed and analyzed. Based on the complete statistical characterization of the Stokes parameters, extracted through appropriate signal processing in the presence of shot and additive Gaussian noise, the optimum maximum likelihood receiver operating symbol by symbol is deri... View full abstract»

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  • An efficient demultiplexing algorithm for non-contiguous carriers

    Publication Year: 1990, Page(s):373 - 376
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    A channel separation algorithm for the FDMA/TDM (frequency division multiple access/time division multiplexing) scheme is presented. A demultiplexing algorithm that would allow demultiplexing of only the carriers of interest from the wideband spectrum of the FDMA signal in a random and efficient manner is proposed. The computational requirements indicate that the proposed technique of approximatio... View full abstract»

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  • A novel baud-length memory FSE

    Publication Year: 1990, Page(s):292 - 296
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The author presents a novel fractionally spaced equalizer (FSE) that spans a single symbol period. It is derived from the parametric estimates of a time-invariant or slowly time-varying baseband equivalent channel. The parametric channel estimates are assumed to be obtainable from a training sequence prior to data acquisition. The performance of the FSE depends to a large extent on how well the ch... View full abstract»

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  • A discrete time analysis of the DQDB access protocol with general input traffic

    Publication Year: 1990, Page(s):121 - 126
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The authors present an approximate performance study of the DQDB (distributed queue dual bus) medium access protocol, which is an emerging IEEE 802.6 standard for local and metropolitan area networks. They investigate the influence of general traffic process characteristics on the protocol performance. Due to the consideration of general arrival and service processes, the analysis is derived in th... 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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  • Efficient sampling rate conversion with cubic splines

    Publication Year: 1990, Page(s):439 - 442
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    An efficient implementation of a two-stage fractional sampling rate conversion for digital audio signals is presented, based on: local cubic spline interpolation. The first (up-converter) stage is computationally optimal, using polyphase networks. The second (down-converter) stage generally requires coefficient calculations for each sample, but is also efficient because of the local nature of the ... View full abstract»

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