IEEE Transactions on Communication Technology

Issue 6 • December 1969

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Displaying Results 1 - 24 of 24
  • [Front cover and table of contents]

    Publication Year: 1969, Page(s): 0
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    Freely Available from IEEE
  • The DS 4 Data Switching System

    Publication Year: 1969, Page(s):595 - 599
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (681 KB)

    Wired-logic control is efficient but inflexible, whereas stored-program control is flexible but less efficient. The DS 4 system is a judicious attempt to combine the best features of both methods of control. This is the most evident in the telegraph line control unit, via which messages are received and transmitted, for this unit has the ability to absorb unexpected traffic peaks as a normal opera... View full abstract»

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  • The New Telefunken Electronic Switching System EZM 3

    Publication Year: 1969, Page(s):600 - 605
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (767 KB)

    This local exchange system features new customer services, remotely controlled concentrators, and automatic maintenance and operation facilities. It comprises central control with a memory bank and a speech path network with bistable ordinate switches. View full abstract»

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  • Toll Service Desk: An Improved Concept of Telephone Toll Traffic Control

    Publication Year: 1969, Page(s):606 - 615
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1028 KB)

    A new toll service desk (TSD) system has been developed and successfully introduced, which greatly reduces the human involvement in the processing of operator-assisted telephone toll calls. This combination of an advanced toll recording system, a modem pushbutton-operated console, and a common control crossbar switching system has automated a major portion of the traffic room functions. The design... View full abstract»

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  • Correction to "Computer-aided design optimization of FDM-FM communication systems"

    Publication Year: 1969, Page(s): 615
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (105 KB)

    Equations (10) and (12) of the above-named article are corrected. the original article appears in ibid., vol. COM-17, pp. 403-412, June 1969. View full abstract»

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  • An Adaptive Receiver Implementation for the Gaussian Scatter Channel

    Publication Year: 1969, Page(s):640 - 648
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (926 KB)

    To implement the minimum probability of error receiver forM-ary frequency-shift-keyed (FSK) communications over a Gaussian scatter channel, a minimum mean-squared error estimate of the scattered channel output signal must be constructed. It has been difficult to construct the optimum receiver since the correlation function of the scattered signal must be measured, and the impulse respon... View full abstract»

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  • FM Noise and Clicks

    Publication Year: 1969, Page(s):648 - 653
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (563 KB)

    Rice [1] has shown that the noise output of an FM discriminator may be assumed to be the sum of two uncorrelated components, a Gaussian term and a click term (Poisson shot noise of impulses) for large carrier-to-noise ratios (CNR). In this paper the click process is introduced and the output noise is modeled again as the sum of a Gaussian term and shot-noise term that are in general correlated. Th... View full abstract»

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  • Binary Synchronous Communications

    Publication Year: 1969, Page(s):654 - 658
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    Binary synchronous communications, in particular the line-control functions, are described. These functions are independent of the devices transmitting and receiving, the mode of transmission, and the transmission code. A mode known as transparent transmission allows the transmission of data, independent of its bit structure. The various aspects of transmission are discussed, including station con... View full abstract»

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  • Some Experimental Results on Impulse Noise Classification

    Publication Year: 1969, Page(s):659 - 663
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (513 KB)

    The impulse noise that occurs on telephone channels affects the performance of data transmission systems more than it affects voice communications. As a step in constructing a more meaningful model of a telephone channel for use in data transmission studies, a computer-oriented classification technique to search for representative classes of impulse waveforms has been developed. Classes of impulse... View full abstract»

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  • Performance of Self-Synchronized Phase-Shift Keyed Systems

    Publication Year: 1969, Page(s):664 - 669
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    Tight upper and lower bounds on the probability of errorP(E)are derived for self-synchronized binary phase-shift keyed (PSK) communication systems. It is shown that the differential, decision feedback, and phase, doubling PSK receivers can all be represented by a single system block diagram. A new maximum-likelihood system is also derived and studied. Monte Carlo computer simulation res... View full abstract»

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  • The Design of a Pulse-Position Modulated Optical Communication System

    Publication Year: 1969, Page(s):670 - 676
    Cited by:  Papers (34)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    In recent literature the advantages of an idealized narrow-width pulse-position modulated (PPM) optical communication system, using coherent sources and direct photodetection, have been shown. In this paper the practical design of such an operating PPM link is considered. System performance in terms of error probabilities and information rates is derived in terms of key parameters, such as power l... View full abstract»

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  • Signal Characteristics of a Very-High-Frequency Satellite-to-Aircraft Communications Link

    Publication Year: 1969, Page(s):677 - 685
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1127 KB)

    The results of a series of very-high-frequency (VHF) aeronautical communications tests conducted with NASA Applications Technology satellites are summarized. The tests were undertaken to collect data which could be compared to the results obtained from a previously derived analytical model. Specifically, the objective of the program was the measurement of the received signal strength and fading ch... View full abstract»

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  • An Acousto-Optic Receiver and Fast Spectrum Analyzer for Electromagnetic Signals in the VHF-UHF Range

    Publication Year: 1969, Page(s):686 - 700
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1737 KB)

    The principle of a lightweight acousto-optic receiver and fast spectrum analyzer, capable of reception and analysis of electromagnetic signals in the VHF-UHF range, is described. The principle consists of first converting electromagnetic signals to ultrasonic signals that propagate in a solid transparent medium and subsequently separating these signals into many channels by light diffraction techn... View full abstract»

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  • Nonlinear Compensation

    Publication Year: 1969, Page(s):700 - 704
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (561 KB)

    Intermodulation noise in a frequency-division multiplex (FDM) system arises mainly from third-order nonlinearity in the repeater amplifiers. The way in which a biased semiconductor diode can be incorporated in the emitter feedback impedance of the output stage of each repeater so as to reduce this nonlinearity by compensation is described. It is shown that although it is not practicable to adjust ... View full abstract»

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  • A Method for the Design of Equalizers for High-Grade Channels Transmitted Over Telephone Cable Pairs of Mixed Gauges

    Publication Year: 1969, Page(s):705 - 710
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (661 KB)

    The telephone exchange cable plant may be a mixture of several gauges in a particular run. Predicting its electrical behavior precisely when only one gauge is involved is difficult at best. Gauge mixtures and the lack of accurate records preclude the computational course in the practical case. A method is given for the graphical analysis of cable attenuation obtained from measurements. A means for... View full abstract»

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  • Multiplexing Systems for Pulse-Code-Modulated Hierarchial Networks

    Publication Year: 1969, Page(s):711 - 721
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1247 KB)

    Various synchronization systems which function to multiplex lower speed pulse-code-modulated (PCM) signals into a high-speed signal and to drop each lower signal from the highspeed PCM signal, are considered from a practical viewpoint for a useful PCM hierarchial network, and a suitable evaluation basis for such systems is introduced. Three new stuff-synchronization methods are proposed and design... View full abstract»

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  • Long Loop Ringing

    Publication Year: 1969, Page(s):722 - 725
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (466 KB)

    Both Bell System and also independent telephone operating companies seem to be well aware of the large potential savings in outside plant costs offered by fine gauge cable. The problem, of courses is how to realize these potential savings and still be able to dial, ring, supervise, and talk over the higher resistances and greater facility attenuations that normally result when fine instead of coar... View full abstract»

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  • An Adaptive Equalizer for Television Channels

    Publication Year: 1969, Page(s):726 - 734
    Cited by:  Papers (15)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (897 KB)

    The time-varying nature of long cable systems precludes their use for the transmission of television signals which require a fine degree of equalization. A system has been built, where the TV channel quality is continuously monitored and the required equalization is automatically performed during signal transmission. The principles and operation of this system are explained, and some actual experi... View full abstract»

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  • Error Detection for Partial-Response Systems

    Publication Year: 1969, Page(s):734 - 737
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (477 KB)

    An error detector for data transmission systems using a partial-response signaling format is described. The basis of the error detector is a partial-response correlation constraint. An approximate expression for performance is presented, and it is noted that calculated and experimental performance agree for error rates less than 10-3. View full abstract»

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  • Acoustic Transmission System

    Publication Year: 1969, Page(s):737 - 742
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (686 KB)

    A description of equipment providing acoustical transmission over ordinary telephone lines and utilizing standard telephone handsets is presented. Included is a discussion of the more pertinent parameters which determine the final design of the equipment. Among them are proper orientation of the granular carbon transmitter, maximum line bit rates, and tolerable total harmonic distortion. The frequ... View full abstract»

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  • Calculation of Intermodulation Due to Amplitude Limiting of Multiple Carriers

    Publication Year: 1969, Page(s):743 - 745
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (349 KB)

    A method of computation is presented enabling the estimation of suppression and intermodulation with multiple carriers as the input to a soft- or hard-limiting channel (without memory except for filtering to the first zone). The approach utilizes a direct representation in the time domain and a Monte Carlo simulation to gather statistics over the ensemble of the phase angles of the input carriers.... View full abstract»

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  • The Realization of Compatible Single-Sideband Transmission

    Publication Year: 1969, Page(s):746 - 748
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    Compatible single-sideband transmission has been shown to be possible under the limits of an iterative signal-processing technique and with the use of ideal band-limited channels. A realization technique is presented which removes the constraint of ideal channels, but requires a trivial redefinition of the channel to include the effect of delay elements. The step response and convergence character... View full abstract»

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  • [Back cover]

    Publication Year: 1969, Page(s): 0
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    Freely Available from IEEE
  • The Performance of FSK Permutation Modulations in Fading Channels and Their Comparison Based on a General Method for the Comparison of M-ary Modulations

    Publication Year: 1969, Page(s):616 - 640
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2656 KB)

    A problem that arises in multipath fading channels is that of finding a modulation which enables one to obtain high data rates and at the same time does not lead to an excessively complicated system implementation or the requirement of excessive transmitter power. In many dispersive channels the product of time dispersion and Doppler spread is large, so that coherent modulation systems are not fea... View full abstract»

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Aims & Scope

This Transactions ceased publication in 1971. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope