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IEEE Transactions on Communications

Issue 6 • June 1975

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Displaying Results 1 - 19 of 19
  • [Front cover and table of contents]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE
  • On Crossbar Switching Networks

    Publication Year: 1975, Page(s):646 - 659
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1454 KB)

    For networks that exhibit neither concentration nor expansion, the well-known probabilistic model of C. Y. Lee is refined so as to take account of the dependence of events in different stages. For series-parallel networks, the refined model yields exact expressions for the point-to-point blocking probability. These expressions bear the same relationship to the refined model as the KittredgeMolina ... View full abstract»

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  • Entropy coded differential pulse-code modulation systems for television

    Publication Year: 1975, Page(s):660 - 666
    Cited by:  Papers (15)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (771 KB)

    This paper describes experiments with a television (TV) source encoder which consists of a differential PCM encoder followed by entropy coding. This encoder converts analog television signals into a digital bit stream for digital transmission or storage. When optimized, this type of system is known to perform very close to the rate distortion bound. The differential PCM encoder has a 16-level quan... View full abstract»

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  • Correction to Table of Contents of February 1975 Issue

    Publication Year: 1975, Page(s): 687
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (115 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1975, Page(s): 0
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    Freely Available from IEEE
  • Data-Derived Symbol Synchronization of MASK and QASK Signals

    Publication Year: 1975, Page(s):606 - 620
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (984 KB)

    Much has been said in the literature with regard to the problem of establishing symbol synchronization in binary baseband digital communication systems. By comparison, the literature contains little information relating to the extraction of symbol sync from multilevel baseband data. With the recent interest in multilevel amplitude-shift keying (MASK) and quadrature amplitude-shift keying (QASK) as... View full abstract»

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  • Two Extensional Applications of the Zero-Forcing Equalization Method

    Publication Year: 1975, Page(s):684 - 687
    Cited by:  Papers (17)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The zero-forcing automatic equalization technique is extended to equalization in quadrature amplitude modulation data transmission and TV transmission systems. A general cost function, whose minimization problem can be applied to the automatic equalization in the above two systems, is first presented. Based on this cost function, the zero-forcing equalizability condition is solved. Under this cond... View full abstract»

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  • Determining Repeater Margin with a Stub and Attenuator

    Publication Year: 1975, Page(s):682 - 684
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The margin of a high-speed digital regenerative repeater can be determined easily by adding a misterminated stub at the repeater input. The stub adds an interfering signal which, if large enough, will cause the repeater to make errors. The amplitude of the interfering signal is determined by the termination, so the termination impedance at which errors begin is a good measure of repeater margin. N... View full abstract»

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  • Simple Asynchronous Multiplex System for Unidirectional Low-Data-Rate Transmission

    Publication Year: 1975, Page(s):675 - 679
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The communication system considered is characterized by a large number of stations transmitting messages through a simple binary channel to a single central receiver in an unsynchronized and unorganized fashion. Individual messages are repeated according to statistical criteria. The form of coding selected permits detection but not separation of coinciding or overlapping messages. Hardware require... View full abstract»

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  • An Upper Bound Analysis for Coherent Phase-Shift Keying with Cochannel, Adjacent-Channel, and Intersymbol Interference

    Publication Year: 1975, Page(s):586 - 597
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1120 KB)

    An error-probability upper-bound is developed for coherent phase-shift keying (CPSK) considering the combined effects of Gaussian noise, intersymbol interference (ISI), and several peak-limited circular-symmetric (CS) components such as adjacent-channel interference (ACI) and cochannel interference (CCI). In an earlier paper [1], an upper bound was introduced, based on the "maximizing probability ... View full abstract»

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  • Statistical Methods for Testing Quality of Communication Channels

    Publication Year: 1975, Page(s):670 - 675
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The reliable transmission of information over communication channels depends greatly on the adequacy of the maintenance program provided for the transmission medium. An integral part of such a program is the procedure used for determining the quality of a communication link. In this concise paper, we discuss several statistical methods for ascertaining those impairments-and their respective levels... View full abstract»

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  • Noniterative Automatic Equalization

    Publication Year: 1975, Page(s):621 - 633
    Cited by:  Papers (23)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    An equalizer based on the minimum mean-square error (MSE) criterion, but with direct solution of the resulting equations, is described. The direct solution is based on the algorithms devised by Levinson and Trench. With the availability of large-scale integration (LSI) bipolar computing elements, these algorithms are competitive with iterative procedures. A method is considered for the estimation ... View full abstract»

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  • Cutset Manipulations for Communication Network Reliability Estimation

    Publication Year: 1975, Page(s):569 - 575
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    The problem of calculating the reliability of a communication network of given topology is discussed. The definition of failure is generalized from simple disconnection to the event that terminal capacity falls below some threshold, and simple methods are developed for bounding the probability of such failures and for approximating the mean time between failures (MTBF). It is shown that the cumula... View full abstract»

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  • Phase Error Characteristics of a Second-Order Phase-Lock Loop

    Publication Year: 1975, Page(s):687 - 688
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    An analytical expression for the phase error characteristics of a second-order phase-lock loop (PLL) is determined using the results of a previous nonlinear analysis. The characteristics determined are for sinusoidal FM in the absence of noise. Theoretical and experimental results are compared and are in close agreement. The theoretical results are useful as a design aid and in determining the pro... View full abstract»

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  • A Routing Procedure for the TIDAS Message-Switching Network

    Publication Year: 1975, Page(s):575 - 585
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1264 KB)

    In this paper an investigation of some routing methods suitable for a special computer communication network called TIDAS-T, in which the traffic exchange is done according to the store and forward message-switching technique, is elucidated. The properties of different routing procedures and sensitivity of some parameter settings during the various conditions, that may occur in this network, have ... View full abstract»

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  • A Method of Self-Recovering Equalization for Multilevel Amplitude-Modulation Systems

    Publication Year: 1975, Page(s):679 - 682
    Cited by:  Papers (475)  |  Patents (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A self-recovering equalization algorithm, which is employed in multilevel amplitude-modulated data transmission, is presented. Such a self-recovering equalizer has been required when time-division multiplexed (TDM) voice or picturephone PCM signals must be transmitted over the existing frequency-division multiplexed (FDM) transmission channel. The present self-recovering equalizer is quite simple,... View full abstract»

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  • Coding of Multilevel Graphics

    Publication Year: 1975, Page(s):598 - 606
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    In this paper we consider the digitization and coding of graphics, specifically typewritten letters, and make two contributions. The first contribution concerns the tradeoff between resolution and number of gray levels. We carried out subjective tests which showed that, in order to get better image quality at a given bit rate, for good-quality originals, one should use only two levels/sample and h... View full abstract»

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  • Hybrid Amplitude-and-Phase Modulation for Analog Data Transmission

    Publication Year: 1975, Page(s):634 - 645
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    Pulse-amplitude modulation (PAM) is extended to two and four dimensions by means of a nonlinear, memoryless mapping to obtain pulse-amplitude-and-phase modulation (PAPM). This modulation requires either the same bandwidth as double-sideband PAM or twice as much but yields a signal-to-noise ratio (SNR) improvement factor similar to that of FM with considerably less sacrifice of spectral occupancy. ... View full abstract»

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  • Analysis of Synchronous Digital-Modulation Schemes for Satellite Communication

    Publication Year: 1975, Page(s):666 - 670
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The multipath communication channel for space communication is modeled as a multiplicative channel. This paper discusses the effects of the multiplicative channel processes on the symbol error rate for quadrature modulation (QM) digital modulation schemes. An expression for the upper bound on the probability of error is derived and numerically evaluated. The results are compared with those obtaine... 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