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IEEE Transactions on Communications

Issue 1 • Date January 1979

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Displaying Results 1 - 25 of 41
  • [Front cover and table of contents]

    Publication Year: 1979, Page(s): 0
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  • Modulation Transfer from TDMA On-Off Bursting to FM Carriers in Memoryless Nonlinear Devices: Part I - Power Spectra

    Publication Year: 1979, Page(s):94 - 100
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (538 KB)

    The modulation transfer noise caused by the "on-off" bursts of TDMA signals is modeled and analyzed in detail. Expressions of the power spectra of the RF and the baseband modulation transfer noise have been obtained for the most general case of L TDMA and N FM carriers in a zero-memory nonlinear amplifier such as a helix-typ... View full abstract»

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  • Congestion Control of Store-and-Forward Networks by Input Buffer Limits - An Analysis

    Publication Year: 1979, Page(s):127 - 134
    Cited by:  Papers (71)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (806 KB)

    The use of input buffer limits for congestion control of store-and-forward networks is investigated. An analytic model is formulated. Based upon the analytic results, strategies are proposed for the design of input buffer limits to achieve the maximum network throughput as well as to provide a safety margin for uncertainties in traffic assumptions. A useful capacity law is discovered. Major conclu... View full abstract»

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  • Further Comments on "VHF and UHF Links Using Mountains as Reflectors"

    Publication Year: 1979, Page(s):255 - 256
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (223 KB)

    First Page of the Article
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  • Comments on "VHF and UHF Links Using Mountains as Reflectors"

    Publication Year: 1979, Page(s): 255
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (111 KB)

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  • Authors' reply

    Publication Year: 1979, Page(s): 256
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

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  • [Back cover]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • Characteristics of Manchester-Coded FSK

    Publication Year: 1979, Page(s):209 - 216
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    In this paper, the Manchester-coded frequency-shift-keyed (MCFSK) signal is shown to be representable in terms of an in-phase (I) and a quadrature (Q) carrier term. The I -term carries the bit timing and the Q -term carries the message informatio... View full abstract»

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  • Optimal Quantization of the Rayleigh Probability Distribution

    Publication Year: 1979, Page(s):101 - 112
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    We have derived an efficient and general algorithm for optimal quantization and applied it to the important, but neglected Rayleigh random variable. The optimal quantization range and output levels for the distortion criterion of minimum mean squared error have been calculated and tabulated for numbers of output levels from 1 to 64. We also compute and report the corresponding distortions and outp... View full abstract»

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  • Decomposition of Traffic in Loss Systems with Renewal Input

    Publication Year: 1979, Page(s):44 - 58
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1440 KB)

    A method is proposed for the analysis of a teletraffic network with alternative routing. The approach used is to model a "general link" as a separate entity, being a first step towards analyzing the network in a link-by-link fashion. To this end the general link is considered to be a group of fully available trunks offered a number of separate streams of traffic. By considering the multivariate po... View full abstract»

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  • Digital Bandlimiting Filters for P.C.M. Transmission Systems

    Publication Year: 1979, Page(s):240 - 246
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    Bandlimiting filtering is required at the input to p.c.m. transmission and switching systems to prevent aliasing. The required filtering can be performed by a combination of analog and digital filters or by analog filters alone. This paper discusses a combination of a simple analog filter and digital filter suitable for Large Scale Integration. Both recursive and transversal digital filters are co... View full abstract»

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  • Analysis of Multipath Outage with Applications to 90-Mbit/s PSK Systems at 6 and 11 GHz

    Publication Year: 1979, Page(s):68 - 75
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    An analytical study to predict multipath fading outages in terrestrial digital radio systems is described. The method, which is quite general, makes specific use of previously reported statistics on multipath fading. It is applied, in this study, to 6- and 11-GHz systems carrying 90 Mbits/s per RF channel. For purposes of comparing alternate approaches, three different modulations are considered, ... View full abstract»

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  • The Effect of Call Routing Rules in Non-Blocking Three-Stage Switching Networks

    Publication Year: 1979, Page(s):150 - 152
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Sequential hunting and call packing rules are discussed as they are used to route calls in a non-blocking symmetric 3-stage netWork. It is shown that the Clos bound is met with both procedures, for most network parameter values. View full abstract»

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  • On the Reduction of Hardware in Digital Modulators

    Publication Year: 1979, Page(s):221 - 228
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    A Possible simplification of digital modulation (carrier multiplication with sine or cosine signal) is discussed. Using the fact that samples of a sine (or cosine) function are periodic under certain circumstances, a novel implementation is proposed. Depending on the ratio of sampling and carrier frequencies this implementation can lead to a reduction of cost in comparison with usual methods of im... View full abstract»

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  • Analysis and Simulation of No. 4 ESS Network Performance

    Publication Year: 1979, Page(s):1 - 9
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (984 KB)

    No. 4 ESS is a newly developed, high capacity toll switching machine with a maximum of 107,000 4-wire terminations. Call switching is accomplished via a large digital time-division switching network. The network was evaluated both by a full scale simulation study and by analytical methods to determine its performance characteristics, that is, its blocking and switching capacity. In both simulation... View full abstract»

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  • Fading Effects on the Performance of a Spread Spectrum Multiple Access Communication System

    Publication Year: 1979, Page(s):143 - 149
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    The effects of fading on the performance of a spread spectrum multiple access communication system using direct sequence modulation are investigated. Expressions for the system signal-signal-to-noise ratio and for the mean and variance of the desired and interfering users are derived in terms of the spreading code and fading correlation functions. The system error probability is also evaluated for... View full abstract»

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  • High Order Algorithms for Adaptive Filters

    Publication Year: 1979, Page(s):216 - 221
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    Faster convergence of adaptive filters has been of particular interest in the areas of adaptive equalizers and adaptive antennas. The algorithm most frequently suggested is some variation of the firstorder gradient-descent LMS algorithm. This paper investigates a general procedure for the design of higher-order algorithms. Convergence of the mean weight vector and the variance is compared for thre... View full abstract»

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  • Optimization of Quadrature-Carrier Modulation for Low Crosstalk and Close Packing of Users

    Publication Year: 1979, Page(s):176 - 185
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    For FDM users with arbitrary quadrature-carrier modulation, signal smoothness at bit transitions is shown to completely determine mean-square crosstalk between users at large frequency spacings. To find modulation forms which reduce interference between users at closer spacings, where crosstalk is not dependent solely on bit transition smoothness, optimum windows are generated by numerical minimiz... View full abstract»

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  • Optimal Switch-Concentrator Location for a Telephone Network

    Publication Year: 1979, Page(s):36 - 44
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    This paper considers the problem of the optimal introduction of digital switching equipment into an existing analog local telephone network. The criterion used is the present worth of annual charges. Using certain plausible assumptions, this multilocation dynamic problem is shown to reduce to an equivalent static problem. The latter can be expressed as a classical plant location problem for which ... View full abstract»

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  • Calculation of Some Functions Arising in Problems of Queueing and Communications Traffic

    Publication Year: 1979, Page(s):249 - 251
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Useful formulas are developed for the iterative calculation of the inverse of blocking probability for Erlang loss and Erlang delay systems, and for the determination of offered traffic and blocking probability for Erlang loss systems when the carried traffic and number of servers are given. These formulas which arise in many problems of queueing and communications traffic can be easily programmed... View full abstract»

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  • Equalization Design for a 600 MBd Quantized Feedback PCM Repeater

    Publication Year: 1979, Page(s):134 - 142
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    A frequency domain approach to the design of equalization for a quantized feedback PCM repeater is described. The method commences with a feedback path specified as a low-pass filter function and path delay from which the ideal signal path equalization is calculated. This characteristic is approximated by network realizable poles and zeros, with all-pass sections satisfying the non-minimum phase e... View full abstract»

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  • A Hybrid of Erlang B and C Formulas and Its Applications

    Publication Year: 1979, Page(s):59 - 68
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (960 KB)

    This paper attempts to broaden the usefulness of existing Erlang grade of service formulas, especially when faced with the evolving extensive changes in telephone networks. The old Markov traffic arrival and Markov call duration (or service) models are combined with what may be called more realistic user behavior and network scenarios. For the specified service system models, a generalized merger ... View full abstract»

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  • An Approximate Method to Estimate an Upper Bound on the Effect of Multipath Delay Distortion on Digital Transmission

    Publication Year: 1979, Page(s):76 - 81
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Microwave transmission on line-of-sight paths occasionally experiences severe fading associated with multiple transmission paths of differing propagation delays. An expression for the envelope delay distortion caused by two such paths is presented. Assuming that envelope delay distortions comparable to the symbol length of a digital signal could be intolerable, an expression is derived for critica... View full abstract»

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  • A Convenient Multivariate Gram-Charlier Type A Series

    Publication Year: 1979, Page(s):247 - 248
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    It is often necessary to approximate the probability density function of a random variable from given statistical moments. The Gram-Charlier Type A series is one well known method for such representations. In this note, the Gram-Charlier Type A series is generalized to the multidimensional case. View full abstract»

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  • Signal-to-Noise Ratio Evaluations for Nonlinear Amplifiers

    Publication Year: 1979, Page(s):197 - 201
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    This paper presents a solution for the output signal-to-noise ratio of a bandpass nonlinearity which is attractive for numerical evaluations of certain nonlinearities of interest. The solution is obtained by solving a differential equation which results in an expression for the n th order Chebyshev transform of an odd-order nonlinearity in terms of the 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