IEEE Transactions on Communications

Issue 9 • September 1974

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Displaying Results 1 - 25 of 52
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • Preface

    Publication Year: 1974, Page(s):1157 - 1158
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    Freely Available from IEEE
  • Speech Interpolation in Digital Transmission Systems

    Publication Year: 1974, Page(s):1179 - 1189
    Cited by:  Papers (15)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (939 KB)

    In a telephone conversation a channel is activated by the voice only 25 percent of the time. It is therefore possible to provide a number ofmconnections with a number ofnchannels, wherenis less thanm. When the number of connections is large,m/n(gain) tends to the inverse of the activity. The interpolation procedures used in overload conditions... View full abstract»

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  • Adaptive Delta Modulation with Delayed Decision

    Publication Year: 1974, Page(s):1195 - 1198
    Cited by:  Papers (24)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A class of adaptive schemes for delta modulation is considered whereby the decision about step size is a function of the present and the lastksymbols. Such schemes are studied by computer simulations using speech-like signals through evaluation of SNR. Occasional large overshoots appear in the reconstructed signal after the integrater, and to avoid such events it is proposed to store a ... View full abstract»

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  • P-N-P-N Interface-to-Interface Switching for Telephony and Broad-Band Communication

    Publication Year: 1974, Page(s):1250 - 1263
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1518 KB)

    To be economically attractive, all-electronic spacedivision multiplex (SDM) networks must have a minimum of wiring and interconnection joints, take maximum advantage of IC-type matrix modules, offer inexpensive control (including checking, fault location and traffic supervision) and still satisfy transmission requirements. A means to meet all these demands is presented. It is based on a special p-... View full abstract»

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  • A Processor Controlled Telephone Switching System - TXE4

    Publication Year: 1974, Page(s):1276 - 1282
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    Telephone subscribers require a service which is reliable and offers a wide range of facilities. System design is of vital importance in determining the ability of an administration to meet these requirements economically, and processor controlled exchanges can be designed to provide the necessary qualities of reliability and flexibility. This paper describes in outline the operation of the TXE4 s... View full abstract»

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  • Design, Testing, and Operation of an X-Band Satellite Communications System

    Publication Year: 1974, Page(s):1338 - 1353
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1784 KB)

    The salient features of a militaryX-band satellite system, which has been planned at SHAPE Technical Centre (STC) to form part of an automatically switched network, is outlined. Satellite post-launch test and system operational requirements such as in-orbit testing, orbit determination and prediction, frequency planning, and system control are discussed. Technical facilities and techniq... View full abstract»

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  • A Coding Scheme for Duplex Channels

    Publication Year: 1974, Page(s):1369 - 1373
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (458 KB)

    In this paper we describe a coding strategy for binary duplex channels (BDC's) that essentially matches the performance of a system with two identical binary forward channels using a systematic rate-frac{1}{2}convolutional code on each of these channels. In other words, our coding strategy achieves the same effect as would the turning around of the feedback channel. View full abstract»

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  • Effects of the Diode Junction Capacitance on the Conversion Loss of Microwave Mixers

    Publication Year: 1974, Page(s):1428 - 1435
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (806 KB)

    The theory of the frequency down-converters, which use sinusoidally driven exponential junction diode, is reviewed here with the purpose of investigating the effects of the junction Capacitance on the conversion loss. The analysis deals With single-ended mixers, both in theZandYconfigurations. Their performances are compared with those obtained from the same configurations of... View full abstract»

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  • Telecommunications in Greece - Present and Future

    Publication Year: 1974, Page(s):1467 - 1469
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  • Communications Research in Finland (1972-1973)

    Publication Year: 1974, Page(s):1479 - 1481
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  • [Back cover]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • Error Performance for Adaptive Transmission on Fading Channels

    Publication Year: 1974, Page(s):1331 - 1337
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    A communication system is analyzed in which the transmission power and/or rate are adjusted to the observed state (attenuation) of a slowly fading channel. The optimum control of power and rate with channel attenuation is determined. Some suboptimum control rules are also investigated. The average probability of error is evaluated for various types of adaptive transmission, imposing different cons... View full abstract»

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  • Adaptive Sampling of Speech Signals

    Publication Year: 1974, Page(s):1189 - 1194
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    The present work gives a proposed method of sampling speech signals with a nonuniform sampling rate according to the magnitude of the slope of the signal, provided that the average sampling rate satisfies Shannon's requirements. With this proposed method, the quality of the reconstructed speech signal is improved. Experimental results have been compared with those obtained mathematically, and sati... View full abstract»

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  • More on Intermodulation Noise in FDM-FM Radio-Relay Systems

    Publication Year: 1974, Page(s):1361 - 1368
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    Intermodulation distortion in FDM-FM radio-relay systems is investigated from an aspect that appears not to have been analyzed in appropriate depth previously, viz., determining more or less exactly the bandwidth within which intermodulation noise is sensitive to transmission imperfections of the radio channel. To this end an analysis of the distortions of linearly filtered anglemodulated signals ... View full abstract»

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  • Circular Waveguide System for Trunk Communications

    Publication Year: 1974, Page(s):1374 - 1377
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    9-km waveguides of 70-ram inner diameter (ID) have been inserted from manholes into ducts of polyvinal chloride (PVC). Expansion joints are provided for taking up length variations. Only a slight increase in attenuation was measured for the helix waveguide after the laying works. Phase-shift-keyed (PSK) signals with bit rates of up to 640 Mbit/s have been transmitted via this line. A new approxima... View full abstract»

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  • TDM-FDM Transmultiplexer: Digital Polyphase and FFT

    Publication Year: 1974, Page(s):1199 - 1205
    Cited by:  Papers (138)  |  Patents (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The cascading of a discrete Fourier transform processor and a digital polyphase network is shown to reduce the computation rate in frequency multiplexing-demultiplexing systems to a value close to minimum. Implementation advantages of that technique are pointed out. The highest efficiency is achieved when the number of channels is close to a power of 2, which is demonstrated by the 60-channel freq... View full abstract»

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  • Metal-Sealed Gas-Protected Contacts

    Publication Year: 1974, Page(s):1420 - 1423
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Contacts in telephone switching systems are used for two basic applications, either for switching functions or control functions, having quite different requirements. So it has been found practical when new gas-protected contacts were being developed by Siemens to have two types of contacts: a highly miniaturized make contact especially for use in crosspoint relays with a lifetime expectancy of ab... View full abstract»

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  • Present Status and Expected Development of the Italian Telecommunication Network

    Publication Year: 1974, Page(s):1469 - 1479
    Cited by:  Papers (1)
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    The problems set by the development of the Italian telephone network and particularly by the scheduled introduction of new services (also of a nontelephone type) are surveyed in this paper. The solution of these problems employing analog techniques presents many difficulties and, also, creates obstacles for future developments; therefore Italy is at present oriented towards the extensive use of di... View full abstract»

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  • The Time-Division Multiplex Switching of Digital Speech Channels

    Publication Year: 1974, Page(s):1271 - 1276
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    PCM transmission and PCM switching cooperate economically in so-called integrated networks (integrated switching and transmission (IST)). Economical and technical aspects are ruling the introduction of IST. Possibilities of introduction were investigated for the various network levels in the Federal Republic of Germany. It was proved that first of all PCM tandem exchanges are required to which up ... View full abstract»

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  • Present State and Trends of Public Communications in the Fedearal Republic of Germany

    Publication Year: 1974, Page(s):1456 - 1467
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    The introduction gives an account of the historical development of telecommunications in Germany (Federal Republic of Germany), the legal status of the Deutsche Bundespost, its relationship with the German telecommunication industry, and the status of the broadcasting organizations. On the basis of the present state of the art, the future trends in switching and transmission as well as in cable an... View full abstract»

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  • Telephone Antiinterference Technique of the German Federal Post Office Telephone System

    Publication Year: 1974, Page(s):1268 - 1271
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    This paper presents function facilities for suppression of telephone lines and associated subscriber equipment. A setup of test combinations can be arranged by technical clerks at the centralized antiinterference station as well as by a field engineer. The present telephone technique is checked directly from the test desk via direct through-connected lines of the supervisory network. In special ca... View full abstract»

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  • Communications in Israel

    Publication Year: 1974, Page(s): 1456
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

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  • An Integrated Communication System with Fully Decentralized Switching

    Publication Year: 1974, Page(s):1292 - 1296
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A purely branched network with decentralized switching using glass fiber channels is discussed. A concise survey is given of the possibilities applying wide-band transmission lines, especially glass fibers, in a communication system, with regard to the integration of services. A purely branched wide-band network with subscribers connected to the lines according to the method of time division multi... View full abstract»

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  • Communications Research in Romania

    Publication Year: 1974, Page(s): 1492
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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