IEEE Transactions on Communications

Issue 11 • November 1980

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Displaying Results 1 - 18 of 18
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Statistical Block Protection Coding for DPCM-AQF Speech

    Publication Year: 1980, Page(s):1899 - 1907
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    The statistical block protection coding scheme [2] for protecting DPCM encoded speech signals through noisy channels has been extended to accommodate DPCM-AQF encoded speech, where AQF stands for adaptive quantization with forward (explicit) transmission of step size. Signal-to-noise ratio (SNR) gains, typically 12 dB, have been achieved over a dynamic range> 20dB for a bit error rat... View full abstract»

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  • Iterative Computation of the M/G/1 Queue Length Distribution via the Discrete Fourier Transform

    Publication Year: 1980, Page(s):1929 - 1932
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (451 KB)

    An iterative method is presented by which the distribution of queue lengths in theM/G/1queue may be computed. The method applies to the nonsteady-state case and involves repeatedly performing convolutions. The steady-state solution may be obtained by performing the iterations until convergence occurs. A frequencydomain equivalent of the method is presented which gives much greater compu... View full abstract»

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  • On the Stability of Slotted ALOHA Systems

    Publication Year: 1980, Page(s):1936 - 1939
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (311 KB)

    In this correspondence we prove the following properties of the stability of the finite population model of slotted ALOHA systems. 1) The input-output packet flow balance principle [1] and the concept of expected drift [2] used for the stability analysis of the slotted ALOHA system are mathemtaically equivalent. 2) The slotted ALOHA system can only have either one stable equilibrium point or three... View full abstract»

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  • Comment on "A General Theory for Intelligible Crosstalk Between Frequency-Division Multiplexed Angle-Modulated Carriers"

    Publication Year: 1980, Page(s):1939 - 1943
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (354 KB)

    There are a few errors, a couple of poor suggestions, and several assumptions made without being stated in the above paper by Shimbo and Pontano for crosstalk computation. The method does not seem to work when the two carriers (for a two carrier case) are not at equal power levels. Also, better approximations of TWTA characteristics do not seem to produce more reliable results. View full abstract»

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  • Correction to "Optimization of the processing gain of an M-ary direct sequence spread spectrum communication system"

    Publication Year: 1980, Page(s): 1944
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (74 KB)

    Summary form only given, as follows. On page 1398 of the above paper (ibid., vol. COM-28,Part II,pp. 1389-1398, Aig. 1980), the Acknowledgment was published incorrectly. The correct Acknowledgment is as follows: "ACKNOWLEDGMENT The authors would like to thank Prof. C. Ziegler for generating the numerical results, and J. Bartow and S. Hall for their helpful suggestions." View full abstract»

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  • [Back cover]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Magnitude/Phase Quantization of Independent Gaussian Variates

    Publication Year: 1980, Page(s):1924 - 1929
    Cited by:  Papers (42)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The performance of two-dimensional polar quantization of independent Gaussian variates is evaluated as a possible improvement over one-dimensional quantizers. The distortion measure is assumed to be squared error. The quantizers are a generalization of more restrictive polar quantizers analyzed previously, admitting a differing number of phase positions in each magnitude sector. Results are provid... View full abstract»

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  • Authors'Reply

    Publication Year: 1980, Page(s):1943 - 1944
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    This is in reply to the comments made by Messrs. X. T. Vuong and H. J. Moody on "A general theory for intelligible crosstalk between frequency-division multiplexed angle-modulated carriers." We do want to express our gratitude for the editorial comments which were made by Messrs. Vuong and Moody which could be of help to the reader. The comments of substance however we feel are in many cases misle... View full abstract»

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  • Charge-Pump Phase-Lock Loops

    Publication Year: 1980, Page(s):1849 - 1858
    Cited by:  Papers (482)  |  Patents (113)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    Phase/frequency detectors deliver output in the form of three-state, digital logic. Charge pumps are utilized to convert the timed logic levels into analog quantities for controlling the locked oscillators. This paper analyzes typical charge-pump circuits, identifies salient features, and provides equations and graphs for the design engineer. View full abstract»

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  • A Modified Monte-Carlo Simulation Technique for the Evaluation of Error Rate in Digital Communication Systems

    Publication Year: 1980, Page(s):1916 - 1924
    Cited by:  Papers (143)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    Digital communication systems are frequently operated over nonlinear channels with memory. The analysis of the performance of these systems is difficult and no complete analytical treatment of the problem has been obtained before. Several recent efforts have been directed toward the computation of error probabilities via Monte-Carlo simulation using a complete system model. These simulations requi... View full abstract»

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  • The Multiple Stack Algorithm Implemented on a Zilog Z-80 Microcomputer

    Publication Year: 1980, Page(s):1876 - 1882
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    A sequential algorithm for decoding convolutional codes, the multiple stack algorithm or MSA devised by Chevillat and Costello, has been implemented and tested on a Zilog Z-80 microcomputer system. The results of this implementation, when compared to those of a (2, 1)8 Viterbi algorithm implemented on the same microcomputer system, show that the MSA obtains significantly higher data throughput. Th... View full abstract»

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  • Self-Recovering Equalization and Carrier Tracking in Two-Dimensional Data Communication Systems

    Publication Year: 1980, Page(s):1867 - 1875
    Cited by:  Papers (1577)  |  Patents (107)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    Conventional equalization and carrier recovery algorithms for minimizing mean-square error in digital communication systems generally require an initial training period during which a known data sequence is transmitted and properly synchronized at the receiver. This paper solves the general problem of adaptive channel equalization without resorting to a known training sequence or to conditions of ... View full abstract»

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  • Performance Analysis of Mixed-Base Modulation System

    Publication Year: 1980, Page(s):1908 - 1916
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    In this paper the performance of the mixed-base modulation (MBM) system is analyzed for the case where the input signal is a sample function of a Gaussian random process and an optimum stretching is employed. The comparison of theoretical performance of the MBM system with that of other common modulation schemes such as FM and PCM/PSK shows that it provides performance much better than that of tho... View full abstract»

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  • Balanced HDLC Procedures: A Performance Analysis

    Publication Year: 1980, Page(s):1889 - 1898
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    The prime objective of the present paper is to analyze the performance of HDLC Balanced Class of Procedures, i.e., to quantitatively study the interaction among a multiplicity of parameters which are procedure specific, characterize the properties of the transmission medium, and identify the operational characteristics and requirements. The approach taken is to consider two kinds of operation: a s... View full abstract»

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  • A Modified Barrett-Lampard Expansion and Its Application to Bandpass Nonlinearities with Both AM-AM and AM-PM Conversion

    Publication Year: 1980, Page(s):1859 - 1866
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    A two-dimensional Barrett-Lampard expansion is developed to handle two-dimensional nonlinear systems with random Gaussian inputs. The theory is applied to the problem of evaluating the mean signal and the inphase and quadrature noise correlation functions at the output of a TWT nonlinearity exhibiting arbitrary AM-AM and AM-PM characteristics, when the input consists of a narrow-band signal and Ga... View full abstract»

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  • On the Throughput of an ALOHA Channel with Variable Length Packets

    Publication Year: 1980, Page(s):1932 - 1935
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    In this paper we give a new simple expression for the probability of successful transmission on an infinite population ALOHA channel with variable length packets. Expressions for the throughput and the probability density of the packet length on the channel are derived in a straightforward way along with the best and the worst length densities. View full abstract»

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  • Delay Analysis of TASI with Random Fluctuations in the Number of Voice Calls

    Publication Year: 1980, Page(s):1883 - 1889
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    In this paper we consider a system where the talkspurts from several voice conversations are buffered and multiplexed over the same transmission channels. A simple mathematical model is given for the case where the number of voice calls may statistically come and go. This model is then used to numerically analyze the system and make comparisons with previously presented results. 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