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IEEE Transactions on Communications

Issue 6 • Date June 1983

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Displaying Results 1 - 20 of 20
  • [Front cover and table of contents]

    Publication Year: 1983, Page(s): 0
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    Freely Available from IEEE
  • Comments on Electronic Techniques for Pictorial Image Reproduction

    Publication Year: 1983, Page(s):846 - 848
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    The role of dither threshold matrices has not been paid much attention in a recent paper [1]: These comments highlight the useful features of the so-called Nasik pattern as a threshold matrix. It is shown that the total number of Nasik type matrices is 384. The properties of Nasik patterns are invariant to dyadic shifts. Hence, random selection of matrices and adaptive selection schemes can be dev... View full abstract»

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  • [Back cover]

    Publication Year: 1983, Page(s): 0
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    Freely Available from IEEE
  • Stability and Optimization of the CSMA and CSMA/CD Channels

    Publication Year: 1983, Page(s):763 - 774
    Cited by:  Papers (38)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    A comprehensive study of the stability and optimization of the infinite population, slotted, nonpersistent CSMA and CSMA/ CD channels is presented. The approach to both stability and performance optimization differs significantly from previous work, and provides a number of new results including robustness in stability and performance in the presence of channel and control parameter variations. It... View full abstract»

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  • Multiprocessor Implementation of Adaptive Digital Filters

    Publication Year: 1983, Page(s):826 - 835
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    Adaptive filters, employing the transversal filter structure and the least mean square (LMS) adaptation algorithm, or its variations, have found wide application in data transmission equalization, echo cancellation, prediction, spectral estimation, on-line system identification, and antenna arrays. Recently, in response to requirements of fast start-up, or fast tracking of temporal variations, fas... View full abstract»

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  • Spectral Analysis and Implementation of Duobinary FSK Systems Working at High Bit Rates

    Publication Year: 1983, Page(s):811 - 816
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A new modulation technique for nonperiodic data is presented. Binary data, coded by means of the duobinary technique, modulate a voltage controlled oscillator (VCO). The system has a very simple structure and is capable of transmitting data having a variable bit rate about twice the carrier (VCO) frequency. The resulting spectrum, centered around the VCO frequency, could be as narrow as 0.3 times ... View full abstract»

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  • The Uses of Kosten's Systems in the Provisioning of Alternate Trunk Groups Carrying Heterogeneous Traffic

    Publication Year: 1983, Page(s):741 - 749
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    A functional recursive scheme is described and linked with the equivalent random theory to estimate heterogeneous call blocking probabilities and "overflow" variances in toll network trunk groups. It is then used to calculate exactly the call blocking probabilities in multidimensional Kosten overflow and Engset finite source models. Numerical examples are shown. View full abstract»

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  • Unauthorized Descrambling of a Random Line Inversion Scrambled TV Signal

    Publication Year: 1983, Page(s):816 - 821
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    Simple techniques for unauthorized descrambling of a random line inversion scrambled television signal are proposed. An analysis of the complexity of the proposed descrambling process is presented and it is shown that high-quality estimates of moderately long encoding sequences can be obtained with reasonable memory and delay. An improvement to the basic scheme which substantially reduces memory r... View full abstract»

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  • A Performance Study of NLA 64-State QAM

    Publication Year: 1983, Page(s):821 - 826
    Cited by:  Papers (7)  |  Patents (52)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The performance of a modulation technique which is both power and bandwidth efficient, termed nonlinearly amplified 64-state quadrature amplitude modulation (NLA 64-state QAM), is studied. To assess the effects of selective fading and/or system filter imperfections, computer simulated results are presented which show the sensitivity of the modulation technique to typical group delay and amplitude ... View full abstract»

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  • Distributions of the Two-Dimensional DCT Coefficients for Images

    Publication Year: 1983, Page(s):835 - 839
    Cited by:  Papers (297)  |  Patents (41)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    For a two-dimensional discrete cosine transform (DCT) image coding system, there have been different assumptions concerning the distributions of the transform coefficients. This paper presents results of distribution tests that indicate that for many images the statistics of the coefficients are best approximated by a Gaussian distribution for the DC coefficient and a Laplacian distribution for th... View full abstract»

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  • Implementation of a Multirate Speech Digitizer

    Publication Year: 1983, Page(s):775 - 783
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (928 KB)

    In this paper, implementation of a compact and efficient multirate speech digitizer with variable transmission rates of 2.4, 4.8, 9.6, and 14.96 kbits/s is presented. The multirate algorithm has been made based on the residual-excited linear prediction (RELP) vocoder with a transmission rate of 9.6 kbits/s. The residual encoder employed in the RELP vocoder uses hybrid companding delta modulation (... View full abstract»

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  • Improvements of Antijam Performance of Spread-Spectrum Systems

    Publication Year: 1983, Page(s):803 - 808
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    The present paper gives theoretical analysis and simulation tests of a proposed external circuit connection for enhancing the performance of spread-spectrum (SS) systems in the presence of continuous wave (CW) interference. This connection is an adaptive notch filter. It consists of a hard limiter, a phase-locked-loop (PLL) tracking the CW interference yielding a first estimate, an adaptive two-qu... View full abstract»

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  • The Effects of Noise Correlation and Power Imbalance on Terrestrial and Satellite DPSK Channels

    Publication Year: 1983, Page(s):750 - 755
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    New results are given for the bit error probability for binary DPSK modulation over both terrestrial and satellite channels taking into account noise correlation and power imbalance. The new expressions are remarkably simpler than their previously published counterparts. For the terrestrial channel, the results are in closed form in terms of tabulated functions and, for the hard-limiting satellite... View full abstract»

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  • BTC Image Coding Using Median Filter Roots

    Publication Year: 1983, Page(s):784 - 793
    Cited by:  Papers (56)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2608 KB)

    In this paper we source encode the truncated block used in block truncation coding. It is shown that the truncated block is well approximated by wide-sense Markoff statistics; a signal having these characteristics has a high probability of belonging to the root signal set of median filters. Because the root signal space is much smaller than the binary space, it takes fewer bits to specify the trun... View full abstract»

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  • A Multi-Bit-Rate Substitute-Communication System with High Call-Carrying Capacity

    Publication Year: 1983, Page(s):799 - 803
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A multi-bit-rate substitute-communication system (MSCS) is an efficient means to achieve higher call-carrying capacity in a congested network. When a trunk line is congested with a large amount of traffic, MSCS makes subscribers communicate by a lowerbit-rate medium, even though they request higher-bit-rate forms. This limitation is made when the number of idle basic channels is less than or equal... View full abstract»

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  • A Distributed Algorithm for Minimum Weight Directed Spanning Trees

    Publication Year: 1983, Page(s):756 - 762
    Cited by:  Papers (43)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    A distributed algorithm is presented for constructing minimum weight directed spanning trees (arborescences), each with a distinct root node, in a strongly connected directed graph. A processor exists at each node. Given the weights and origins of the edges incoming to their nodes, the processors follow the algorithm and exchange messages with their neighbors until all arborescences are constructe... View full abstract»

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  • A Procedure for Optimal Dimensioning of Trunk Groups While Serving Two Traffic Loads with Different Grade of Service

    Publication Year: 1983, Page(s):794 - 799
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    In this paper we have developed a procedure for optimal dimensioning of trunk groups which serve two traffic loads with different grades of service prescribed. Owing to the overflow character of traffic in the common part of the trunk group, the Wilkinson equivalent random method was used and algorithms for determining necessary traffic parameters were developed. This procedure and the procedure w... View full abstract»

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  • Anomalous Union Bound Behavior for MFSK Signaling on Inverse Linear Channels

    Publication Year: 1983, Page(s):848 - 849
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Application of the union bound to MFSK signaling on certain channels where probability of bit error varies in an inverse linear fashion with E_{b}/N_{0} can lead to the erroneous conclusion that performance degrades with increasing alphabet size. The anomaly is shown for the worst-case partial band Gaussian interference channel and the Rayleigh fading channe... View full abstract»

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  • Performance of an FH Multilevel FSK for Mobile Radio in an Interference Environment

    Publication Year: 1983, Page(s):840 - 846
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    This paper considers a frequency-hopped multilevel frequency shift keying (FH-MFSK) spread-spectrum communication system applied to cellular mobile radiotelephony. We present a mobile-to-base transmission model that allows us to study system impairments, such as interference from nonsynchronous users and adjacent frequency channels in the presence of matched tuned receiver filters. For interceli i... View full abstract»

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  • An Approximate Formula for Individual Call Losses in Overflow Systems

    Publication Year: 1983, Page(s):808 - 811
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A simple approximate formula for estimating individual call losses in overflow systems is derived using the interrupted Poisson process. The formula presents good accuracy in the single-overflow model, and it is also applicable to the multioverflow model. It is expected that the present formula is useful for the optimization of systems under given service criteria. 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