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IEEE Transactions on Communication Technology

Issue 3 • Date June 1970

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Displaying Results 1 - 20 of 20
  • [Front cover and table of contents]

    Publication Year: 1970, Page(s): 0
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    Freely Available from IEEE
  • Transmission Improvements in Two-Wire Switching Systems

    Publication Year: 1970, Page(s):161 - 164
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    Customer distant dialing without operator intervention is predicated on rapid dependable switching and high-quality transmission with minimum contrast from call to call. It is, therefore, mandatory that each incremental unit in each built-up connection follow the best and latest design practice and be subjected to a rigid preventive maintenance program. This paper will discuss some recent changes ... View full abstract»

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  • Improved Multifrequency Receiver for 2/6 Code Communications Switching

    Publication Year: 1970, Page(s):165 - 168
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (443 KB)

    Telephone interoffice signaling is often accomplished through the use of a system in which digits and control signals are represented by two frequencies chosen from a group of six. A new receiver is described, which provides improved system performance in the presence of noise, line transients, and interfering signals. Several interesting circuit innovations are described. View full abstract»

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  • Electronic Translator System for Toll Switching-System Description

    Publication Year: 1970, Page(s):168 - 175
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (988 KB)

    The electronic translator system (ETS), which represents the first major electronic adjunct to a toll crossbar switching system, employs the stored program control (SPC) system No. 1A in conjunction with electromechanical-electronic interface circuits to perform route translation and selection functions. The introduction of the stored program with its associated electronic speed of operation enabl... View full abstract»

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  • Electronic Translator System for Toll Switching-Routing Strategy and Network Control

    Publication Year: 1970, Page(s):175 - 181
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (885 KB)

    Call routing proceeds, in general, by direct indexing into head-cell referenced tables. A link controller software stage retrieves and stores data pertinent to incoming trunk identification in memory assigned to the sender seized for the call. The decoder channel software stage, separated in time from the link controller stage by electromechanical functions, uses the incoming trunk and sender info... View full abstract»

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  • Advances in Phase-Lock Demodulation

    Publication Year: 1970, Page(s):182 - 191
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1023 KB)

    A procedure for the design of nearly optimum unconditionally stable phase-lock (PL) demodulators is given. The various noise contributions at threshold are investigated and procedures to reduce the noise due to losses of lock are discussed. Experimental results of a nearly optimum 24-telephone-channel PL demodulator equipped with a particular type of threshold noise compensator are given. View full abstract»

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  • A Comparison of the Threshold Extension Capabilities of FMFB and Phase-Lock Loop Demodulators Employed in FDM-FM Communication Systems

    Publication Year: 1970, Page(s):191 - 200
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (930 KB)

    A comparison of the threshold extension capabilities of the phase-lock loop and frequency modulation feedback (FMFB) demodulators is presented. The comparison, instead of being based upon the usual sinusoidal modulating signal type analysis, is based upon analyses which give consideration to the type of modulation that is of most interest to designers of frequency division multiplexfrequency modul... View full abstract»

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  • HF Markov Chain Models and Measured Error Averages

    Publication Year: 1970, Page(s):201 - 208
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (806 KB)

    A set of calculated channel parameters are postulated for a 2800-km HF ionospheric F2 -mode propagation path to organize error sequences into stationary samples. Measurements of the single sideband-frequency-shift keying (SSB-FSK) binary error-free run distributions are used with the parameters to obtain stationary Markov chain transition probabilities. A re... View full abstract»

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  • A Digital System for Compensating Time-Base Error in Analog Tape Recorders

    Publication Year: 1970, Page(s):209 - 213
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (538 KB)

    A buffer shift register with feedback control is used during playback to obtain a variable delay to compensate for recorder time-base error. A prototype system is described and typical experimental results are provided to illustrate the system performance. A mathematical model of the system is developed and used to select system parameters. View full abstract»

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  • Data Modems with Integrated Digital Filters and Modulators

    Publication Year: 1970, Page(s):214 - 222
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (875 KB)

    The application of a binary transversal filter as transmitting filter and a digital circuit as modulator makes it possible to construct data transmitters consisting only of transistors and resistors. The modulation distortion, caused by the keying of a low-frequency square-wave carrier, can be compensated by a modification of the transfer function of the transmitting filter, provided the carder fr... View full abstract»

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  • CODEST: A New Pulse-Code Modulation System for Telegraph and Data Transmission

    Publication Year: 1970, Page(s):223 - 233
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1114 KB)

    CODEST (coding for definition of significant states and transitions) is a system for the transmission of telegraph signals and digital data in coded form. CODEST is a completely "transparent" system; i.e., it restitutes the position of significant instants of a modulation whatever the speed and whatever the operating mode, whether synchronous or asynchronous. Furthermore, the telegraph distortion ... View full abstract»

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  • Use of Differential Phase and Gain to Predict Performance of FM Radio Relay Systems

    Publication Year: 1970, Page(s):234 - 241
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (911 KB)

    Results are given to show that the recently available distortion test sets have greatly extended the usefulness of differential phase and gain measurements in analyzing radio relay transmission deviations. Experimental System results, utilizing both lower and upper baseband test frequencies, indicate improved correlation between intermodulation noise and differential phase and gain measurements. View full abstract»

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  • Binary PSK Error Probabilities with Multiple Cochannel Interferences

    Publication Year: 1970, Page(s):241 - 253
    Cited by:  Papers (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1042 KB)

    Exact error probabilities are given for a binary phase-shift-keyed (PSK) signal which is transmitted over a nondistorting channel, but additively corrupted by Gaussian noise and cochannel interference. Both coherent detection and quasicoherent (noisy reference) detection are considered. The analysis admits a wide class of interferences, but numerical results are limited to interferences modeled by... View full abstract»

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  • The Interference Noise in High-Quality Push-Pull Frequency Modulators

    Publication Year: 1970, Page(s):253 - 258
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    There exists a special kind of loading noise in highly linear push-pull frequency modulators used in radio links. It is caused by the higher order interference products in the mixer of the modulator. This noise can be very annoying and necessitates a careful selection of the oscillator frequencies. The theory leading to optimum frequencies is shown, and equations for the direct calculation of the ... View full abstract»

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  • Numerical Results for Group Delay of Minimum Phase Bandpass Filters

    Publication Year: 1970, Page(s):259 - 261
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    Using the Hilbert transform theory, an expression for the group delay of a minimum-phase bandpass filter is derived. Group delay as a function of amplitude response characteristics (shape factor, bandwidth, and ultimate attenuation) is numerically determined for high-quality filters of the MIL-STD-188C and DCA types. The results are useful in estimating the performance of data transmission systems... View full abstract»

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  • Microwave Space and Frequency Diversity Performance under Adverse Conditions

    Publication Year: 1970, Page(s):261 - 263
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (334 KB)

    An experimental study of the effects of meteorological conditions and irregular terrain upon the performance of an optimum diversity system showed that: l) the refractive index departed appreciably from a linear profile and was not uniform along the propagation path, and 2) more than two field components were produced by the combination of irregular terrain and the nonlinear refractive index struc... View full abstract»

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  • Spectral Density Functions of a Carrier Amplitude Modulated by a Biphase PCM Code

    Publication Year: 1970, Page(s):263 - 265
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The autocorrelation and power spectral density functions are given for a carrier signal that is coherently and noncoherently amplitude modulated by a biphase pulse-code modulation code. View full abstract»

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  • Compatible High-Density Bipolar Codes: An Unrestricted Transmission Plan for PCM Carriers

    Publication Year: 1970, Page(s):265 - 268
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (367 KB)

    A family of compatible high-density bipolar codes (CHDB), which allow unrestricted binary signaling on pulse-code modulation (PCM) systems, while limiting the number of consecutive 0's in the coded sequence, are presented. CHDB compares favorably to other transmission plans with the same purpose. Examples of coding, decoding, and error monitoring hardware are given. View full abstract»

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  • Comments on "Synchronization of a PCM Integrated Telephone Network"

    Publication Year: 1970, Page(s):269 - 270
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (118 KB)

    It is shown that the original stability condition is not sufficient for fully interconnected networks of more than 4 exchanges. A new result is given for such networks. Comparison with a sufficient condition for a general network shows close agreement with the new result. View full abstract»

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  • [Back cover]

    Publication Year: 1970, Page(s): 0
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    Freely Available from IEEE

Aims & Scope

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

Full Aims & Scope