IEEE Transactions on Communication Technology

Issue 6  Part 2 • December 1971

 This issue contains several parts.Go to:  Part 1 

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Displaying Results 1 - 22 of 22
  • Table of contents

    Publication Year: 1971, Page(s): 0
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  • IBM 2750 Voice and Data Switching System: System Generation and Simulation

    Publication Year: 1971, Page(s):1157 - 1163
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (777 KB)

    A large number of IBM 2750 system configurations is available. Any particular 2750 system configuration runs under control of a personalized program package, and each personalized program package is generated on a remote system/360 using as input a generalized program package, written in a macro assembly language, in conjunction with a set of configuration parameters. The output of the generation ... View full abstract»

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  • Performance of Digital Matched Filter Correlator With Unknown Interference

    Publication Year: 1971, Page(s):1163 - 1172
    Cited by:  Papers (17)  |  Patents (11)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (886 KB)

    The S/N loss due to amplitude quantization is examined in connection with a digital matched filter correlator for a binary coded signal. A minimax binary quantizing concept is described, which adds an optimized noise dither prior to hard clipping. The design philosophy is minimax; i.e., the loss from an ideal analog correlator is minimized in the presence of the worst interference constrained to a... View full abstract»

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  • Spectra of Low-Deviation Frequency-Modulated Waves

    Publication Year: 1971, Page(s):1172 - 1178
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (569 KB)

    For non-Gaussian frequency modulation of a sinusoidal carrier, a general method for the calculation of the spectral density is not available. As has been shown by Blachman, we treat here low-deviation frequency modulation by a general stationary low-pass random process and show that, to first order, the modulated wave has a single-pole spectrum. We also present a higher order estimate for the spec... View full abstract»

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  • Performance Analysis of DPSK Systems in Both Thermal Noise and Intersymbol Interference

    Publication Year: 1971, Page(s):1179 - 1188
    Cited by:  Papers (19)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (750 KB)

    In this paper a useful and mathematically rigorous method is presented for exactly evaluating the error-probability performance of a binary differentially coherent phase-shift-keyed (DPSK) system in the presence of both thermal noise and intersymbol interference. The channel filter and the receiver input signal-to-noise ratio are assumed to be given. This method suggests, first, to calculate the p... View full abstract»

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  • FM Noise With Fading Channels and Diversity

    Publication Year: 1971, Page(s):1189 - 1200
    Cited by:  Papers (22)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    The response of an FM discriminator to a fading signal is derived, taking into account the below-threshold noise and the effect of various diversity techniques. The effect of muting the discriminator output at low signal levels is considered and shown to achieve only marginal improvement. The diversity techniques considered are maximal-ratio combining, selection diversity, and equalgain combining.... View full abstract»

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  • Phase-Ambiguity Resolution in a Four-Phase PSK Communications System

    Publication Year: 1971, Page(s):1200 - 1210
    Cited by:  Papers (12)  |  Patents (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1004 KB)

    The constraints of digital satellite communications systems have led to the derivation of a method for resolving the problem of recovered-carrier phase ambiguity in a coherent fourphase phase-shift-keying (PSK) communications system while simultaneously providing synchronization information. This method is described for the general case and a general implementation is given. In addition, implement... View full abstract»

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  • On an Optimum Design for Digital Radio Relay Systems

    Publication Year: 1971, Page(s):1211 - 1217
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (698 KB)

    A straightforward technique for optimum (minimum cost) design of digital radio relay systems is given. The same technique with small modifications is also applied to analog FDM-FM systems. The total cost of a multihop radio relay system including transceiver, antenna, feeder, and mast expenses is considered by developing the cost functions for different component parts, i.e., the dependence of com... View full abstract»

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  • Subsurface Electromagnetic Telecommunication - A Review

    Publication Year: 1971, Page(s):1217 - 1228
    Cited by:  Papers (33)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1127 KB)

    We present a review of the telecommunication possibilities for terminals that are buried in the earth or submerged in the sea. The important role of the operating frequency is stressed. Without being comprehensive, we discuss the relevance of the large number of theoretical papers on electromagnetic waves in conducting media. Our most important recommendation is that the highfrequency band be give... View full abstract»

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  • Subjective Effects of Noise and Loss in Telephone Transmission

    Publication Year: 1971, Page(s):1229 - 1233
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (494 KB)

    This paper describes an experiment that was performed to study the subjective effects of noise and loss on actual telephone calls made within the Murray Hill location of Bell Telephone Laboratories. The effects of noise and loss on talker volume as well as on transmission quality ratings are discussed. A joint transmission grade of service is obtained, which shows, for various distributions of noi... View full abstract»

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  • The Development of Ocean-Cable Plows

    Publication Year: 1971, Page(s):1233 - 1241
    Cited by:  Papers (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (1162 KB)

    Transatlantic communication cables have been in use for more than a century. Studies indicate that more than half of the failures in telegraph cables in the past were due to fishing activity. Since 1956 high-capacity telephone cables have largely replaced telegraph cables. In these new cables 95 percent of all breaks have been due to fishing trawlers. To protect against this hazard a plow was deve... View full abstract»

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  • A Frequency-Division Multiplex Key Telephone System

    Publication Year: 1971, Page(s):1242 - 1243
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    A new key telephone system, which uses four-wire connections between the telephone stations and the electronic key service unit, is described. The drastic reduction in the number of conductors results from the transfer of logic functions from the telephone stations to a central controller. Supervision and control signals are provided by a frequency division multiplex arrangement. View full abstract»

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  • Baseband Modeling and Distortion Equalization of FM Discriminators by Functional Methods

    Publication Year: 1971, Page(s):1243 - 1247
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (529 KB)

    The output of a real discriminator is a nonlinear functional of the instantaneous frequency of its input signal. This functional may be separated into a linear term (the only significant term as the FM deviation goes to zero) and a distortion term. To remove the distortion, a feedback arrangement is proposed in which, after a subtraction, the discriminator output is passed through the inverse of t... View full abstract»

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  • Multiple-Access Communication with Binary Orthogonal Sine and Cosine Pulses Using Heavy Amplitude Clipping

    Publication Year: 1971, Page(s):1247 - 1252
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (586 KB)

    Amplitude clipping of PCM signals consisting of superimposed sine and cosine pulses allows a signal power increase compared to time division of 4 to 10 dB, depending on the activity actor, in peak limited multichannel systems. View full abstract»

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  • Properties of a Class of Signaling Waveforms for Digital Phase Modulation

    Publication Year: 1971, Page(s):1252 - 1259
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    This paper is concerned with the performance of partially coherent digital phase modulation (DPM) systems employing a class of binary signaling waveforms containing a zero crossing within each bit period. The class of waveforms includes the Manchester II bit code and sinusoidal bit code as well as an infinite number of other nonrectangular bit shapes. We wish to study the tradeoff between the RF b... View full abstract»

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  • Random FM in Mobile Radio with Diversity

    Publication Year: 1971, Page(s):1259 - 1267
    Cited by:  Papers (14)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (687 KB)

    The probability density function and autocorrelation function of random FM in a mobile radio system are derived for the case where postdetection selection diversity is used. Closed-form solutions for the autocorrelation function have been found for no diversity and two-branch diversity and infinite series expansions for higher orders. The use of two-branch selection diversity is shown to reduce th... View full abstract»

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  • Audio-Frequency Circulator for Use in Telephone Sets

    Publication Year: 1971, Page(s):1267 - 1271
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (382 KB)

    The gyrator is used as the basis for the realization of an audio-frequency circulator suitable for use in an electronic telephone. The conditions for ideal operation are derived in terms of simple admittances. A gyrator circuit with a specified gyration admittance and phase angle is designed and built and its performance is measured experimentally. View full abstract»

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  • FM Click Shapes

    Publication Year: 1971, Page(s):1271 - 1273
    Cited by:  Papers (9)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    A simple technique for obtaining a great deal of accurate information about FM clicks is described. General comments concerning click shapes are made. View full abstract»

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  • Performance of an Asymptotically Optimum Estimator of the Amplitude of a Coherent Signal

    Publication Year: 1971, Page(s):1273 - 1275
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    An easily implemented estimator of the amplitude (including sign) of a sine wave of known phase is described. The performance of this estimator when zero-mean Gaussian noise is added to the signal is then determined by computing its probability density, mean, and second moment. These statistics are shown to converge to those of the maximum likelihood estimate for large values of signal-to-noise ra... View full abstract»

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  • Systematic Jitter Due to Imperfect Equalization

    Publication Year: 1971, Page(s):1275 - 1276
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (154 KB)

    Extraction of a timing wave from PCM baseband signals through a square law device is studied. The relationship between waveforms and systematic jitter in the timing wave is derived. A criterion for jitter free equalization is obtained. Examples of waveforms that satisfy the criterion are given. Maximum jitters for some practical waveforms are given by numerical examples. View full abstract»

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  • 1971 Technical Reviewers

    Publication Year: 1971, Page(s): 1277
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    Freely Available from IEEE
  • 1971 Index IEEE Transactions on Communication Technology Vol. COM-19

    Publication Year: 1971, Page(s):1277 - 1288
    Request permission for reuse | PDF file iconPDF (1920 KB)
    Freely Available from IEEE

Aims & Scope

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

Full Aims & Scope