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IEEE Transactions on Communications

Issue 10 • Date Oct 1991

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Displaying Results 1 - 16 of 16
  • Log2 (N, m, p) strictly nonblocking networks

    Publication Year: 1991, Page(s):1502 - 1510
    Cited by:  Papers (59)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    A class of self-routing strictly nonblocking switching networks, called the Log2 (N, m, p) network, is introduced. The proposed networks are self-routing and have O (Log2 N) stages between each inlet-outlet pair. The self-routing capability makes it attractive for high-speed switching; the small number of crosspoints between each i... View full abstract»

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  • Performance of convolutionally coded optical M-PPM systems with imperfect slot synchronization

    Publication Year: 1991, Page(s):1433 - 1437
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Performance of convolutionally coded M-ary pulse position modulation (M-PPM) systems in the presence of slot synchronization errors is evaluated for the shot-noise-limited photon-counting receiver and the avalanche photodetection receiver. Both hard and soft (δ-max) demodulation results are given, and two soft-decision metrics are investigated View full abstract»

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  • Comparison of correlator configurations for band-limited FSK demodulation

    Publication Year: 1991, Page(s):1418 - 1422
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Comparisons of the performance of different types of correlator receivers and the limiter-discriminator for FSK (frequency shift keying) demodulation are presented, based on a modification of the analysis used by N. Ekanayake (1984), which allows the IF (intermediate frequency) bandlimiting to be taken into account. It is shown that for optimal values of IF bandwidth and deviation ratio, all recei... View full abstract»

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  • On the evaluation of telecommunications network reliability using routing models

    Publication Year: 1991, Page(s):1494 - 1501
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    A reliability measure that takes into account routing and rerouting policies after failures as well as the capacity of the network to satisfy its demand is proposed. The measure, based on the evaluation of the lost call traffic, needs resolution of a routing model for the states of perfect functioning as well as the most probable failure states. A type of routing model useful for network planning ... View full abstract»

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  • Well-structured FHMA codebooks: a geometric approach

    Publication Year: 1991, Page(s):1427 - 1432
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    A geometric approach in the design of codebooks for OR frequency-hopping multiple-access (FHMA) channels is developed by treating a signal matrix as a finite set of distinct points. The relationship among the parameters of an interference-free j-distinguishable-point codebook, j⩾1, is established by using coordinate-free arguments. Geometry induced by such a codebook is chara... View full abstract»

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  • Estimation variance bounds of importance sampling simulations in digital communication systems

    Publication Year: 1991, Page(s):1413 - 1417
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    In practical applications of importance sampling (IS) simulation, two basic problems are encountered, that of determining the estimation variance and that of evaluating the proper IS parameters needed in the simulations. The authors derive new upper and lower bounds on the estimation variance which are applicable to IS techniques. The upper bound is simple to evaluate and may be minimized by the p... View full abstract»

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  • Jamming in slotted ALOHA multihop packet radio networks

    Publication Year: 1991, Page(s):1525 - 1531
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    The properties of a packet radio network in the presence of active interference are discussed. Both the jammer and the network nodes are subject to an average power constraint. The network uses slotted ALOHA multiple access schemes and some simple fixed routing strategies with constant transmitter power. By using a game-theoretic approach the situation is considered as a two-person constant-sum ga... View full abstract»

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  • MLSE equalization and decoding for multipath-fading channels

    Publication Year: 1991, Page(s):1455 - 1464
    Cited by:  Papers (51)  |  Patents (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    The performance of a receiver using a combined MLSE (maximum likelihood sequence estimation) equalizer/decoder and D-diversity reception is analyzed for multipath Rayleigh fading channels. An upper bound on the (decoded) bit error probability is derived. Comparisons to simulation results show that this upper bound is quite tight when the system has a high signal-to-noise ratio or when div... View full abstract»

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  • Internet time synchronization: the network time protocol

    Publication Year: 1991, Page(s):1482 - 1493
    Cited by:  Papers (464)  |  Patents (120)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1216 KB)

    The network time protocol (NTP), which is designed to distribute time information in a large, diverse system, is described. It uses a symmetric architecture in which a distributed subnet of time servers operating in a self-organizing, hierarchical configuration synchronizes local clocks within the subnet and to national time standards via wire, radio, or calibrated atomic clock. The servers can al... View full abstract»

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  • Highly efficient coding schemes for contour lines based on chain code representations

    Publication Year: 1991, Page(s):1511 - 1514
    Cited by:  Papers (32)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The encoding schemes utilize the first- and second-order Markov models to describe the source structure. Two coding techniques, Huffman encoding and arithmetic encoding, are used to achieve a high coding efficiency. Universal code tables which match the statistics of contour line drawings obtained from 64 contour maps are presented and can be applied to encode all contour line drawings with chain ... View full abstract»

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  • A new interpolation theorem with application to pulse transmission

    Publication Year: 1991, Page(s):1438 - 1444
    Cited by:  Papers (25)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    An interpolation theorem is determined for the case when there are a finite number of arbitrarily placed sampling instants and the interpolation function is the output of a known filter. They are also the interpolation functions with the specified properties that have minimum energy. The theorem is used to determine the input to a communications channel given a finite number of samples of its outp... View full abstract»

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  • Performance analysis of Viterbi detection of class IV partial response for data transmission over multipair cables

    Publication Year: 1991, Page(s):1423 - 1426
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    Partial response class-IV signaling combined with Viterbi decoding to perform maximum-likelihood sequence detection is considered for high-speed data transmission over twisted-pair cables. In order to establish which data rates and distances can be achieved by this method, a performance evaluation is conducted. Binary and quaternary modulations are considered, and disturbance of the received signa... View full abstract»

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  • Second-order statistics of logarithmic quantization noise in QAM data communication

    Publication Year: 1991, Page(s):1465 - 1472
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    When a QAM (quadrature amplitude modulation) data signal is transmitted over a channel that includes PCM codecs, it has frequently been observed and shown that the resulting noise around the final received constellation points grows with the distance of the point from the origin. The authors extend the analysis of this effect, and further show that the noise distribution about each point is ellipt... View full abstract»

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  • Performance of a nonblocking space-division packet switch in a time variant nonuniform traffic environment

    Publication Year: 1991, Page(s):1515 - 1524
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    The authors study the performance of a nonblocking space-division packet switch, given that the traffic intensities at the switch not only are nonuniform but also change as a function of time. A finite-state Markov chain is used as an underlying process to govern the time variation of traffic for the entire switch. The packet arrivals at each input form an independent Bernoulli process modulated b... View full abstract»

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  • A statistical model for the factory radio channel

    Publication Year: 1991, Page(s):1445 - 1454
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    A statistical model, based on experimental data, is presented to characterize the multipath propagation medium in typical manufacturing environments. The statistical behavior of the medium is described by a time-varying impulse response which includes the distribution of the parameters of the channel such as the gain, the interarrival time, and the number of paths. The resolvable components in a n... View full abstract»

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  • Nonlinear continuous phase frequency shift keying

    Publication Year: 1991, Page(s):1473 - 1481
    Cited by:  Papers (19)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    A novel signal-space coded CPM (continuous phase modulated) signaling technique, called nonlinear CPFSK (continuous phase frequency shift keying) signaling, which guarantees the maximum constraint length allowed by the number of states is introduced. Nonlinear CPFSK signals use a suitably selected state transition matrix during all signaling intervals. The selected state transition matrix is reali... View full abstract»

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Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas