IEEE Transactions on Communications

Issue 12 • December 1973

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Displaying Results 1 - 25 of 27
  • [Front cover and table of contents]

    Publication Year: 1973, Page(s): 0
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  • The Bidirectional Communication Theory - A Generalization of Information Theory

    Publication Year: 1973, Page(s):1345 - 1351
    Cited by:  Papers (117)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (705 KB)

    A generalization of information theory is presented with the aim of distinguishing the direction of information flow for mutually coupled statistical systems. The bidirectional communication theory refers to two systems. Two directed transinformations are defined which are a measure of the statistical coupling between the systems. Their sum equals Shannon's transinformation. An information flow di... View full abstract»

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  • A Digital Demodulator for PSK Signals

    Publication Year: 1973, Page(s):1352 - 1360
    Cited by:  Papers (4)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (729 KB)

    This paper describes a digital demodulator for phase-shift-keyed (PSK) signals in which the phase difference between the received signal and a carrier reference is found by measuring digitally the time interval between the zero crossings of the signal and the reference. In the case of coherent detection the reference is locked to one of theMpossible phases of the signal. The advantage o... View full abstract»

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  • The Center Frequency ω0and Normalized Curves of Z0,θ_{Z_0}, γ, θγ, α, β, and Velocity of Propagation for Electrical Transmission Lines

    Publication Year: 1973, Page(s):1361 - 1376
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (910 KB)

    Transmission lines exhibit a center frequencyomega_{0} = sqrt{(R/L)(G/C)}about which several interesting phenomena can be observed when plotted on double log paper. The magnitude of the characteristic impedance manifests "double mirror" symmetry, with the impedance being greater below this frequency than above, whenR/L > G/C, and less if the converse is true. The impedance... View full abstract»

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  • Correction to "Range Extension of a Phase-Locked Loop"

    Publication Year: 1973, Page(s): 1434
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (141 KB)

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  • Correction to "Second-Order Phase-Locked-Loop Acquisition Time in the Presence of Narrow-Band Gaussian Noise"

    Publication Year: 1973, Page(s): 1434
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (141 KB)

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  • A Comparison of Receivers Designed on the Basis of Minimum Mean-Square Error and Probability of Error for Channels with Intersymbol Interference and Noise

    Publication Year: 1973, Page(s):1434 - 1438
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (519 KB)

    In much theoretical work, the minimum mean-square error (MMSE) criterion is used as a basis of design for receivers of dispersed digital signals in the presence of noise. A variant of this criteria that is also frequently used is the MMSE with the constraint of zero intersymbol interference (OISI). In this discussion we compare the probability of errorP(e)of receivers designed with the ... View full abstract»

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  • Correction to "Performance of Jointly Optimized Prefilter-Equalizer Receivers"

    Publication Year: 1973, Page(s):1441 - 1442
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (153 KB)

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  • A Projected Gradient Method for Automatic Equalization in the Discrete Frequency Domain

    Publication Year: 1973, Page(s):1442 - 1446
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (443 KB)

    In a recent paper [1] we reported on a new mean-square error automatic equalizer utilizing Rosen's gradient projection theorem to optimize parameters in the discrete frequency domain. Here we develop another projection method to optimize the discrete frequency parameters. The algorithm converges (in the mean) for any channel, even in the presence of noise. It is shown that for the channels conside... View full abstract»

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  • Are Group Delay Time and/or Phase Delay Time Useful Parameters for Defining Low Distortion Transmission?

    Publication Year: 1973, Page(s):1446 - 1448
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (323 KB)

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  • Recommended Practice for Voice-Frequency Electrical Noise Tests of Distribution Transformers

    Publication Year: 1973, Page(s):1448 - 1455
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (614 KB)

    The practice described herein provides instruction on the testing of distribution transformers as voice-frequency noise generators, to measure the degree to which they may contribute to electrical noise in communication circuits that are in parallel with the power supply circuits serving the transformers. Transformers have a characteristic common to other iron-core devices of causing harmonic curr... View full abstract»

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  • [Back cover]

    Publication Year: 1973, Page(s): 0
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    Freely Available from IEEE
  • No. 1 EAX Common Control

    Publication Year: 1973, Page(s):1393 - 1399
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    This paper describes the common control subsystem of the No. 1 electronic automatic exchange (EAX) switch. The data-processing unit is a high-speed interrupt-driven general-purpose computer. It is broken down into its component parts of control, memories, communication channels, and input/output and its functions are described. The register-sender, a hard-wired preprocessor that handles both incom... View full abstract»

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  • Digital MF Receiver Using Discrete Fourier Transform

    Publication Year: 1973, Page(s):1331 - 1335
    Cited by:  Papers (21)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    In a digital toll switching office a digital multifrequency (MF) receiver may be more economical than the present analog MF receiver. This paper suggests an algorithm that could be used for digital implementation of such a receiver. The algorithm employs discrete Fourier transform and leads to more efficient design than a system using second-order digital bandpass filters. The presented results of... View full abstract»

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  • The Lincoln Training System

    Publication Year: 1973, Page(s):1335 - 1345
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1088 KB)

    LTS (Lincoln Training System) is an automated training system that has been designed to meet the need for individualized, selfpaced learning outside of as well as within a conventional classroom environment. The system employs microfiche as the basic medium for storing and distributing instructional material. A solid-state electrooptical reader has been developed to permit storage of audio and bra... View full abstract»

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  • No. 1 EAX Maintainability

    Publication Year: 1973, Page(s):1381 - 1384
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The importance and objectives of maintainability to a telephone switching system are reviewed. Design approaches involving system structure, components, application software, and maintenance software are discussed. The basic elements of the system's maintainability: malfunction detection, retry, unit isolation, system recovery, fault localization, repair, and preventative maintenance are described... View full abstract»

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  • No. 1 EAX Switching Plan and Network

    Publication Year: 1973, Page(s):1399 - 1405
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    Suitability of a switching system to solve wide and diverse application problems as well as the general case, is largely determined by its switching plan. In No. 1 EAX, the strategy of the plan is to establish a flexibility in internal network trunking that allows separation of traffic by type, directional flow, and intensity. The three major network divisions-line, selector, and trunk registerare... View full abstract»

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  • Two-Level Block Encoding for Digital Transmission

    Publication Year: 1973, Page(s):1438 - 1441
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    Communication channels with no transmission at dc require data encoding to eliminate dc from the signal. Many coding schemes have been developed for this purpose. The scheme discussed here uses code blocks with equal numbers of plus and minus pulses, according to a previously published algorithm. This code is compared to a three-level "bipolar" coding scheme in terms of spectral characteristics, e... View full abstract»

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  • No. 1 EAX System Objectives and Description

    Publication Year: 1973, Page(s):1405 - 1409
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    This paper discusses the application of the No. 1 EAX system as a class 5 or a combined class 4 and 5 office. All hardware subsystems are briefly described, and the major software programs are introduced. System features from manufacturing through subscriber features to maintenance features are described, and the system capacity is discussed in terms of traffic and directory numbers. View full abstract»

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  • No. 1 EAX Operating System Software

    Publication Year: 1973, Page(s):1390 - 1393
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    The operating system provides the environment for proper execution of the application and diagnostic software. The control of processor time and memory and the paging of drum resident software into core memory are described. System configuration control, and special control of interrupts and programs, for diagnostic purposes, are discussed and described. View full abstract»

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  • No. 1 EAX Diagnostic Software

    Publication Year: 1973, Page(s):1377 - 1381
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The common maintenance software, a part of the operating system, is described and its significance for the control of diagnostic programs and system hardware configuration is emphasized. Diagnostic software functions of isolation, recovery, localization, routining, and repair verification are discussed and the diagnostic package for each of the subsystems is described. View full abstract»

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  • Progress Tones in PCM Switching Environment

    Publication Year: 1973, Page(s):1431 - 1434
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    This correspondence defines a new set of precision tone frequencies for digitally generating normal progress tones in a PCM switching environment. The technique of generating the progress tones is similar to the one described for digital multiple frequency (MF) tone senders in which the tone is generated by reading a memory store that contains the binary words representing a presynthesized wavefor... View full abstract»

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  • Variable Length Coding for Increasing Traffic Capacity in PCM Transmission Systems

    Publication Year: 1973, Page(s):1422 - 1430
    Cited by:  Papers (3)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The probability density function of PCM encoded speech signals has been measured, and it has been found that, as a result of companding, the distribution is rather flat except in the neighborhood of the zero level. On the basis of the measured probability density function (PDF) a variable length prefix code was developed that allows an increase in the traffic capacity of PCM transmission systems. ... View full abstract»

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  • No. 1 EAX Call-Processing and Metering Software

    Publication Year: 1973, Page(s):1384 - 1390
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    This paper provides a basic description of the No. 1 electronic automatic exchange (EAX) call-processing and metering software programs. The call-processing portion of the paper describes how the callprocessing program and the call-processing data base provide the system with the originating, digit analysis, charge analysis, routing, and terminating phases of setting up a call. The metering portio... View full abstract»

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  • Beam Stability Control in Optical Waveguides Subject to Statistical Variations

    Publication Year: 1973, Page(s):1409 - 1414
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Beam position control in beam waveguides subject to statistical variations is studied. Variations in alignment and component values cause the beam to be displaced from the guide axis. A control system to correct this displacement is described. Both the expected and the rms values of the beam position are discussed. An approximate expression for the stability conditions is determined. 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