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IEEE Transactions on Communications

Issue 9 • September 1978

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Displaying Results 1 - 15 of 15
  • [Front cover and table of contents]

    Publication Year: 1978, Page(s): 0
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    Freely Available from IEEE
  • Carrier Synchronization Techniques for Unbalanced QPSK Signals-Part I

    Publication Year: 1978, Page(s):1325 - 1333
    Cited by:  Papers (15)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    This paper uses MAP estimation techniques to obtain carrier reconstruction circuits for unbalanced QPSK signals. In addition, the performance analysis of these circuits is carried out to the extent that a loop design can proceed. Optimal weighting coefficients in the receiving system are identified as functions of theI-Qpower and data rate splits. Finally, numerical results are presente... View full abstract»

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  • Carrier Synchronization Techniques for Unbalanced QPSK Signals-Part II

    Publication Year: 1978, Page(s):1334 - 1341
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (441 KB)

    This paper develops the theory for assessing the tracking performance and designing carrier synchronization loops which are to be matched to an unbalanced QPSK signal design. It is assumed that the power split and theIandQchannel data rates are arbitrary. Bit synchronization is assumed unavailable for both carrier reconstruction techniques which have been suggested via MAP es... View full abstract»

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  • Tree-Encoding of Speech Using the (M, L)-Algorithm and Adaptive Quantization

    Publication Year: 1978, Page(s):1376 - 1379
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (402 KB)

    This paper shows the utility of using adaptive quantizers in the tree-encoding of speech waveforms based on the (M, L) algorithm [1]. Resulting adaptive differential PCM (ADPCM) and adaptive delta modulation (ADM) encoders, with time-invariant prediction networks, can provide useful speech outputs at bit rates in the order of 24 kbits/s; at 16 kbits/s, on the other hand, the encoders ex... View full abstract»

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  • Error Probability Performance of Unbalanced QPSK Receivers

    Publication Year: 1978, Page(s):1390 - 1397
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (713 KB)

    A simple technique for calculating the error probability performance and associated noisy reference loss of practical unbalanced QPSK receivers is presented. The approach is based on expanding the error probability conditioned on the loop phase error φ in a power series in φ and then, keeping only the first few terms of this series, averaging this conditional error probability over the p... View full abstract»

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  • Comments on "The Modeling of Adaptive Routing in Data-Communication Networks"

    Publication Year: 1978, Page(s): 1399
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (91 KB)

    First Page of the Article
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  • Author's reply

    Publication Year: 1978, Page(s):1399 - 1400
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (193 KB)

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  • [Back cover]

    Publication Year: 1978, Page(s): 0
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    Freely Available from IEEE
  • Effect of Phase Ripple on Class 4 Partial Response Data Signals

    Publication Year: 1978, Page(s):1397 - 1399
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    An expression is derived for the mean square error of a SSBAM or a baseband multilevel class 4 partial response data signal when distorted by a channel which has a sinusoidal phase ripple. Such characteristics are approximated when the channel has been equalized by so called "bump" group delay equalizers. Included are the expressions for the optimum carrier phase and sampling time. For a low frequ... View full abstract»

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  • An Upper Bound on the Performance of Pulse Modulation Systems

    Publication Year: 1978, Page(s):1352 - 1355
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A lower bound is found on the mean square error achievable by any nonlinear pulse modulation system without memory. This bound differs by 6 dB from the limit given by Shannon theorems, at high signal-to-noise ratios. The bound is obtained by finding the signal locus which minimizes a simple lower bound on mean square error, for a given average signal energy and without bandwidth constraints. For t... View full abstract»

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  • Fixed Assignment Access Technique

    Publication Year: 1978, Page(s):1370 - 1376
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    In this paper, two implementations of the fixed assignment technique are examined for time sharing either a satellite or terrestrial channel among the users of a data communication system. In fixed assignments, the transmission time on the channel is partitioned and permanently assigned to the users. The equations for the user buffer queue length and message delay are obtained for arbitrary alloca... View full abstract»

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  • Global Scheduling Approach to Conflict-Free Multiaccess via a Data Bus

    Publication Year: 1978, Page(s):1342 - 1352
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    A global scheduling multiple access (GSMA) scheme for data communication via a high speed bus is described. The GSMA scheme, which has a variable length frame format and the desirable property of guaranteeing each active user a minimum service per frame, attains conflict-free multiaccess and has the flexibility of providing more channel capacity to the large users. An expression for the mean syste... View full abstract»

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  • Adaptive Multipath Cancellation for Digital Data Communications

    Publication Year: 1978, Page(s):1380 - 1390
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    In this paper, an adaptive spectral equalization technique is developed for multipath cancellation, and more generally for any minimum-phase distortion, which is implemented by a constrained form of adaptive linear prediction. The technique does not use decisiondirected feedback, has guaranteed convergence and stability, and is simple to realize using conventional circuit technology. Binary amplit... View full abstract»

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  • Acquisition Behavior of a First-Order Digital Phase-Locked Loop

    Publication Year: 1978, Page(s):1364 - 1370
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A general "phase-plane" technique for investigating the stability of nonlinear difference equation is described and applied to determine the stability criterion of a first-order digital phase-locked loop (DPLL). If the loop is stable, it is shown that acquisition behavior can be modeled as a first passage time problem. Using this model, one can evaluate the acquisition probability and the mean tim... View full abstract»

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  • A Binary Quantized Digital Phase Locked Loop: A Graphical Analysis

    Publication Year: 1978, Page(s):1355 - 1364
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A non-uniform sampling digital phase locked loop (DPLL), with a hard limiter as quantizer, is analyzed by a graphical method in the case of phase and frequency step inputs and no noise. The cycle slipping and the limit cycles phenomena are investigated. An upper-bound to the model gain and, consequently, to the pull-in range is obtained. Also a closed-form expression of acquisition time is derived... 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