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IEEE Transactions on Communications

Issue 11 • November 1974

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Displaying Results 1 - 25 of 28
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • A Unified Algorithm for Designing Multidrop Teleprocessing Networks

    Publication Year: 1974, Page(s):1762 - 1772
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1198 KB)

    The problem of designing minimum-cost multidrop lines which connect remote terminals to a concentrator or a central data-processing computer is studied. In some cases, optimal solutions can be obtained by using either linear integer programming or a branch-bound method. These approaches are not practical, since they lack flexibility and require an enormous amount of computer time for most practica... View full abstract»

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  • Nonideal Photoelectron Counting

    Publication Year: 1974, Page(s):1836 - 1841
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    Expressions are obtained for the probability of error of a binary intensity-modulated direct-detection optical communication system consisting of an ideal photodetector followed by a nonideal photoelectron counter, in this case anRClow-pass filter. Calculation of probability of error requires the determination of the output statistics of the nonideal counter. Numerical techniques are us... View full abstract»

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  • High-Capacity PCM Transmission Systems for Toll Networks

    Publication Year: 1974, Page(s):1881 - 1885
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (659 KB)

    High-capacity pulse code modulation (PCM) transmission systems have made little impact despite the availability of suitable technology and the rapid growth of low-capacity systems. It is shown that high-capacity systems can now be introduced into toll telephony networks without short-term economic or compatibility disadvantages and with considerable long-term advantages. A 120Mbits/s coaxial cable... View full abstract»

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  • Single Channel PCM Audio Encoding Using Level Elimination Companding

    Publication Year: 1974, Page(s):1885 - 1890
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (493 KB)

    This concise paper describes a single channel audio coder suitable for use in Picturephone audio transmission. Companding is carried out digitally by sequential elimination of levels from the linear scheme with equally spaced quantizing levels. The basic technique, called level elimination encoding is presented and analyzed. Then a level-at-a-time coder whose quantizer consists of a linear segment... View full abstract»

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  • On the Complexity of Strictly Nonblocking Concentration Networks

    Publication Year: 1974, Page(s):1890 - 1892
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (390 KB)

    A concentration network is a contact switching network that provides a number of potential users (connected to its inputs) with access to a smaller number of equivalent resources (connected to its outputs). Its basic property is that any sufficiently small subset of the inputs can be simultaneously connected by disjoint paths to distinct outputs, although the particular outputs to which they are t... View full abstract»

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  • Comments on "Real-Time Minimal-Bit-Error Probability ' Decoding of Convolutional Codes

    Publication Year: 1974, Page(s):1892 - 1894
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The real-time minimal-bit-error probability (RTMBEP) decoding procedure recently presented by Lee is compared with the sequential compound decoding procedure originally described by Abend and Fritchman for the detection of symbols in the presence of intersymbol interference. We compare the number of computations and the amount of storage required for each algorithm as well as show how Lee's proced... View full abstract»

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  • Author's reply

    Publication Year: 1974, Page(s):1894 - 1895
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (166 KB)

    First Page of the Article
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  • Comments on "The Effects of Quadratic AM-PM Conversion in Frequency-Division Multiplexed Multiple-Access Communication Satellite Systems"

    Publication Year: 1974, Page(s): 1895
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (76 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • An Analysis of a Loop Switching System with Multirank Buffers Based on the Markov Process

    Publication Year: 1974, Page(s):1772 - 1778
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    The analysis of a distributed loop switching system with multirank buffers is based on the Markov process. The mergeability of the process is proved for a system of single-rank buffers, and generalized to systems of multirank buffers. The results for single-rank buffers are found to be in agreement with already established results. The solution for double-rank buffers, the only multirank buffer sy... View full abstract»

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  • Baseband Pulse Transmission in a Chain of Analog Repeaters

    Publication Year: 1974, Page(s):1823 - 1835
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    Simple methods that compensate for low- and highfrequency delay distortions, which are the predominant distortions in a baseband hybrid digital transmision line, have been developed. Compensation for low frequency distortion is optimized by a rational minimum-phase function. Compensation for high-frequency distortion is attained by a combination of an optimum cutoff shape and an all-pass network. ... View full abstract»

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  • A Stochastic Analysis of Signal Sharing in a Bandpass Nonlinearity

    Publication Year: 1974, Page(s):1778 - 1788
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    When constant-amplitude signals and noise constitute the input to a bandpass device exhibiting a nonlinear input-output power characteristic and AM/PM conversion, the relative signal levels may change and intermodulation (IM) products are produced. A new and totally general method of evaluating the complex Fourier coefficient of any desired output component is presented. The analysis is based on r... View full abstract»

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  • The Effects of Clock Drift Upon the Synchronization of Digital Communications Networks

    Publication Year: 1974, Page(s):1842 - 1844
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Effects of clock drift on the performance of a discretetime control system for synchronizing all the clocks in a digital communications network are shown by a detailed analysis of the dynamic behavior of the simple case of a two-node network. With a unidirectional frequency drift of one or both oscillators, it is shown that the buffer stores eventually overflow. A more general linear control schem... View full abstract»

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  • Sequentially Adaptive Prediction and Coding of Speech Signals

    Publication Year: 1974, Page(s):1789 - 1797
    Cited by:  Papers (44)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (960 KB)

    A new method of speech digitization called residual encoding is introduced, and its application to the speech digitization problem is studied. The residual encoding system is a form of differential pulse code modulation which utilizes both an adaptive quantizer and an adaptive predictor. The residual encoder differs from previous systems in two ways. First, a sequential estimation method is used t... View full abstract»

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  • Stability of a Synchronization Control System for an Integrated Telephone Network

    Publication Year: 1974, Page(s):1848 - 1853
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    This paper is a sequel to previous papers which considered the characteristics of a proposed synchronization control system for an integrated telephone network. In those papers, delay of the paths of each junction, one for transmission and the other for control signal, were assumed to have the same value. Though the analysis produced exact expressions for the static and dynamic characteristics of ... View full abstract»

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  • Optimal Filters for Binary Detectors with Comparator Hysteresis

    Publication Year: 1974, Page(s):1853 - 1856
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    Methods that increase the speed of digital detection comparators can also produce hysteresis, wherein the effective threshold in a given signaling interval is influenced by the previous output. If the comparator is fed by a peak-limited IF detector output followed by a detection filter with unity dc gain, the hysteresis can be a significant fraction of the peak comparator input. This concise paper... View full abstract»

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  • Linear, Nonlinear, and Adaptive Delta Modulation

    Publication Year: 1974, Page(s):1807 - 1823
    Cited by:  Papers (6)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1552 KB)

    The paper treats linear and nonlinear methods that refine the delta modulation process. These methods improve the quality of the decoded signal at a given transmission rate. Two linear processes are analyzed. The first one matches the source signal to the coder for minimum weighted noise in the decoded signal. The second one influences the signal which is fed to the comparator; it shapes the spect... View full abstract»

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  • The Distribution of Error Probability for Rayleigh Fading and Gaussian Noise

    Publication Year: 1974, Page(s):1856 - 1858
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The distribution function of the probability of error in the presence of Rayleigh fading and Gaussian noise is determined for the basic binary modulation schemes of coherent frequencyshift keying (CFSK), noncoherent frequency-shift keying (NCFSK), differential phase-shift keying (DPSK), and coherent phase-shift keying (CPSK). General expressions for the distribution function of error probability a... View full abstract»

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  • Interpolative Digital-to-Analog Converters

    Publication Year: 1974, Page(s):1797 - 1806
    Cited by:  Papers (22)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    Interpolative digital-to-analog (D/A) converters produce a final output via a two-step process. First, each digital input word is used to control a circuit whose output oscillates rapidly (i.e., many times faster than new digital input values are provided) between coarsely spaced analog values (i.e., many times coarser than the resolution specified by the input word). Second, the oscillating analo... View full abstract»

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  • A New Carrier Recovery Technique for Vestigial-Sideband (VSB) Data Systems

    Publication Year: 1974, Page(s):1866 - 1870
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    In this concise paper we have developed a new carrier recovery system for vestigial sideband amplitude modulation (VSB-AM) data sets. Neither dc restoration nor extra bandwidth is required for the proposed system. A pilot tone is transmitted at the carrier frequency and the phase jitter is derived from the quadrature chnnnel. "Artificial" phase jitter which is introduced by the data signal can be ... View full abstract»

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  • Topological Design of Multipoint Teleprocessing Networks

    Publication Year: 1974, Page(s):1753 - 1762
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    This paper is concerned with the problem of designing a minimum-cost network of acceptable performance that connects several remote terminals to a central processor using multidrop lines. It is assumed that the message generation rate at each of the terminals is known and that the communication lines of the network have the same capacity. A simple model of the network is used to derive performance... View full abstract»

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  • The Economics of Segregated and Integrated Systems in Data Communication with Geometrically Distributed Message Lengths

    Publication Year: 1974, Page(s):1844 - 1848
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Integrating two different message switching systems into one with the resultant integrated system having the combined channel capacity, need not necessarily result in improved performance. This segregated versus integrated system question has been adequately answered in a recent communication for the specific case when the message arrivals are Poisson processes and the message lengths for the two ... View full abstract»

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  • Statistical Behavior of Second-Order Phase-Locked Loops in the Presence of a Mixture of Impulsive and Gaussian Noise

    Publication Year: 1974, Page(s):1877 - 1881
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    An equation is found for the steady-state probability density function of the modulo-2π-reduced phase error of a secondorder phase-locked loop (PLL) with a proportional-proportional-plus-integral control type filter. The equation involves a certain conditional expectation which has been evaluated in an approximate way following the same approach used by previous authors in the case of sole Ga... View full abstract»

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  • Reliability Bounds for Coherent Communications with Maximum Likelihood Phase Estimation

    Publication Year: 1974, Page(s):1859 - 1862
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    This concise paper describes a new technique for upper bounding the performance of coherent binary phase-shift keyed (PSK) systems which derive a phase reference using one-shot maximum likelihood phase estimates. By performance, we mean any positive monotonically increasing function of phase error, such as error probability or power loss. A tight upper bound to the phase error cumulative distribut... 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