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Communications, 1992. ICC '92, Conference record, SUPERCOMM/ICC '92, Discovering a New World of Communications., IEEE International Conference on

14-18 June 1992

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Displaying Results 1 - 25 of 363
  • All-optical bidirectional Manhattan networks

    Publication Year: 1992, Page(s):1461 - 1467 vol.3
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The authors showed previously that very simple wavelength switches are sufficient for the implementation of unidirectional all-optical Manhattan networks. They illustrate that similar components can be used for the implementation of bidirectional all-optical Manhattan networks, with the advantage of a significant reduction in the number of nodes traversed by the user data, with a much smaller powe... View full abstract»

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  • Limiting removal depth in the pushout scheme for ATM networks

    Publication Year: 1992, Page(s):997 - 1003 vol.2
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (577 KB)

    The asynchronous transfer mode (ATM) handles cells of different classes in various ways to provide the different services with their respective quality of service requirements. To decrease the loss probability of high priority cells at the expense of cells with lower priorities, two loss priority schemes have been proposed in the literature: capped threshold and push out. Since throughput is sligh... View full abstract»

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  • Limited-1 cyclic service system as an imbedded Markov chain at server arrival instants

    Publication Year: 1992, Page(s):400 - 404 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The authors model the limited-1 cyclic service system as an embedded Markov chain at server arrival instants. Using the related state equations, for a system with (N+1)-queues, a set of (N+1) simultaneous equations in (N+1) unknowns is derived whose solution gives the probability of queue i for i=0,1, . . .,N being empty when the server arrives there. An expression of the expected number of custom... View full abstract»

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  • A class of protocols for heavy loaded multiple-channel local area networks

    Publication Year: 1992, Page(s):23 - 27 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Multichannel local area networks (MLANs) that use several parallel broadcast channels and carrier sense multiple-access (CSMA)-type protocols have been shown to provide better performance than single-channel LANs of the same total bandwidth. The authors introduce new protocols that apply an asymmetric load assignment policy and show that at medium to high levels they allow higher throughput than t... View full abstract»

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  • SUPERCOMM/ICC '92. Discovering a New World of Communications (Cat. No.92CH3132-8)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (33 KB)
    Freely Available from IEEE
  • On the efficiency of fast frequency hopping multiple-access systems

    Publication Year: 1992, Page(s):33 - 37 vol.1
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The spectral efficiency of fast frequency hopping/multiple frequency shift keying (FFH/MFSK) multiple-access systems is investigated and its dependence on the basic system parameters is developed. Noncoherent MFSK signaling is studied in an additive white Gaussian noise (AWGN) channel. Chip synchronism and complex addition of signals having the same frequency are assumed at the hard-limited combin... View full abstract»

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  • Throughput performance of unslotted FH-CDMA systems

    Publication Year: 1992, Page(s):38 - 41 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The authors evaluate the throughput in unslotted frequency hopping code division multiple access, (FH-CDMA) systems under Poisson traffic. Reed-Solomon coding is assumed in the systems. The relationship between slotted and unslotted FH-CDMA systems is also studied. The system model is introduced, and some of the results obtained in previous research on packet error probabilities for unslotted FH-C... View full abstract»

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  • Comments on tone calibration in time varying fading

    Publication Year: 1992
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    The validity of the slow fading assumption used in previous analyses of tone calibration techniques (TCT) is examined. TCT systems previously proposed will produce an error floor, albeit a very low one. The requirements for the elimination of the error floor are examined, and the error floor produced in a typical TCT system is studied. Monte Carlo integration techniques are used to evaluate integr... View full abstract»

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  • M-ary differential phase-shift keying with diversity combining for communications over a doubly selective fading channel

    Publication Year: 1992, Page(s):46 - 50 vol.1
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The authors analyze the bit and symbol error probabilities of a system employing M-ary differential phase-shift keying (DPSK) and equal-gain diversity combining for land mobile radio systems. The channel is a doubly selective fading channel. An efficient iterative expression is given for computation of error probabilities. Expressions are derived for second moments of certain intermediate... View full abstract»

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  • Modified Viterbi detection for recording channels with jitter

    Publication Year: 1992, Page(s):131 - 135 vol.1
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The performance of Viterbi detection is degraded in the presence of jitter in magnetic recording. Based on the assumption of Gaussian jitter, the authors propose a new suboptimal detection algorithm, which is essentially Viterbi detection with a modified error metric which takes into account the pattern-dependent nature of jitter noise. Performance analysis and simulation results indicate that for... View full abstract»

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  • A performance analysis for trellis coded hybrid-ARQ protocols

    Publication Year: 1992, Page(s):647 - 651 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A method is described for modifying trellis coded modulation systems for use in type-1 hybrid automatic repeat request (ARQ) protocols. The difference in the metrics between the surviving and the nonsurviving paths throughout the trellis can be used to determine the desirability of retransmission requests. Bounds on the reliability and throughput performance of the resulting error control scheme a... View full abstract»

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  • Optimum filter design for partial-response class-IV transmission systems

    Publication Year: 1992, Page(s):51 - 56 vol.1
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    The design of a mixed digital/analog transmit filter and a variable analog receive filter for partial-response class-IV signaling over metallic cables is discussed. Optimum filters are analytically determined for maximum cable length and additive Gaussian noise. Since the transfer function of the overall channel is given, these filters are independent of crosstalk. The optimum filter characteristi... View full abstract»

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  • Decentralized control of a multiple shared memory module ATM switch

    Publication Year: 1992, Page(s):704 - 708 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    In an earlier paper, the authors proposed an asynchronous transfer mode (ATM) switch (called the MSM switch) in which several shared memory modules were placed in parallel with every input and every output having access to every one of the switch modules. Here the effort is toward building distributed control schemes for the MSM switch to achieve the same performance. In the distributed control sc... View full abstract»

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  • An efficient memory fault-test technique for ASIC-based memories

    Publication Year: 1992, Page(s):136 - 141 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A new test technique that is efficient in terms of additional circuitry and test vectors and is easily implemented as a built-in-self test (BIST) circuit is described. The technique tests the individual memory elements, the input and output data buses, the address decoding circuits, the read and write select lines, the test circuits, and any address or data buffers associated with the memory. The ... View full abstract»

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  • An integrated system for video, voice and data communications

    Publication Year: 1992, Page(s):511 - 515 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    A particular technique for integrating different categories of traffic, typified as data, voice, and video in a multimedia environment, is discussed. The available bandwidth is divided into two portions, one for the first-class traffic that encompasses video and voice, which is never to be exceeded, and a second for the buffered data traffic that varies according to the first-class load. The effic... View full abstract»

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  • Staggered multicast protocol with collision-free acknowledgement in multihop spread spectrum packet radio networks

    Publication Year: 1992, Page(s):1338 - 1343 vol.3
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    The authors present the staggered multicast protocol with collision-free acknowledgement, which is suitable for unicasting and broadcasting as well as multicasting in multihop spread spectrum packet radio networks. The common-header/transmitter-based spreading code is used for data packet transmission and the receiver-based code is used for acknowledgement packet transmission. By staggering packet... View full abstract»

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  • A new approach for evaluating the performance of a symbol timing recovery system employing a general type of nonlinearity

    Publication Year: 1992, Page(s):1441 - 1445 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A new technique is presented for evaluating the jitter performance of a symbol timing recovery (STR) subsystem for binary synchronous data transmission systems. The STR system consists of any even-symmetric zero-memory nonlinear device followed by a narrowband filter tuned to the pulse repetition frequency. The exact analytical expressions are derived for the mean and the mean-squared values of th... View full abstract»

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  • Computation of exact interference and probability of error for several CDMA communication systems

    Publication Year: 1992, Page(s):652 - 656 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A new class of hit arrays called cyclical hit arrays is introduced. They give insight into the previously unavailable properties of a modified number of theoretical frequency-hop patterns, which are based on Welch-Costas and quadratic congruence codes. Three theorems related to the cyclical hit arrays are proved and are used to determine the exact probability distribution function of a random vari... View full abstract»

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  • A near perfect stable random access protocol for a broadcast channel

    Publication Year: 1992, Page(s):370 - 374 vol.1
    Cited by:  Papers (22)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A near perfect stable random access protocol for a broadcast channel, the distributed queuing random access protocol (DQRAP), is presented and evaluated. The DQRAP protocol utilizes minislots to provide ternary channel feedback and two distributed queues to resolve contention and to schedule the transmission of messages. Modeling and simulation indicate that the DQRAP protocol, using as few as thr... View full abstract»

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  • Selective handover for traffic balance in mobile radio communications

    Publication Year: 1992, Page(s):1840 - 1846 vol.4
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The selective handover for traffic balance (SHOT) technique, which is effective in increasing frequency efficiency for varying traffic loads, is presented. If the traffic of a cell increases temporarily such that the resource utilization rate exceeds a threshold, SHOT hands some calls over to the appropriate adjacent cells. Three algorithms are proposed and examined through computer simulations. T... View full abstract»

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  • Switched simplex high bit rate services in today's residential environment

    Publication Year: 1992, Page(s):1799 - 1804 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Critical technologies required to support high bit rate and broadband services in the near and long term are discussed. Specifically, the loop requirements for residential video on demand are presented. The use of asymmetrical digital subscriber lines and Motion Picture Experts Group coding and switching systems to support video on demand are described View full abstract»

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  • ATC-based hi-fi audio coding for ATM networks

    Publication Year: 1992, Page(s):57 - 61 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The authors propose an adaptive transform coding (ATC)-based hi-fi audio coding method for asynchronous transfer mode (ATM) networks. To maintain robustness despite cell loss, a novel layered coding scheme has been employed in ATC. In this approach, higher/lower priority is assigned to most/least significant bits, rather than to lower/higher frequency bands, as is commonly done in video coding. Th... View full abstract»

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  • A functional testing approach for interworking between CCS7 TUP and non-CCS7 signaling systems

    Publication Year: 1992, Page(s):572 - 576 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The authors focus on the interworking problem between Common Channel Signaling System No. 7 (CCS7) TUP (telephone user part) and non-CCS7 signaling systems. A novel functional testing approach to verify proper interworking of CCS7 TUP and other non-CCS7 signaling systems in a switching system is presented. Basically, the problem of signaling interworking on a telephone switch is abstracted into fu... View full abstract»

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  • A deadlock-free routing control algorithm for torus network based ATM switches

    Publication Year: 1992, Page(s):709 - 713 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Tightly coupled multicomputer networks offer an alternative approach to building large asynchronous transfer mode (ATM) switches for broadband networks. Among them multidimensional tori are the most popular topologies in use today among high performance multicomputers. Communication deadlock and its avoidance are critical issues in routing control algorithms for such networks. A new routing algori... View full abstract»

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  • DQDB: a fast converging bandwidth balancing mechanism that requires no bandwidth loss

    Publication Year: 1992, Page(s):142 - 146 vol.1
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A bandwidth balancing (BWB) mechanism has been included in the IEEE 802.6 standard for metropolitan area networks (MANs). A new BWB mechanism for the distributed queue dual bus (DQDB) is proposed that does not waste any idle slots. For this reason it can converge faster to the steady state than the current BWB mechanism of the DQDB. The authors analyze the throughput and delay performance of the p... View full abstract»

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