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IEEE Transactions on Communications

Issue 9 • Date 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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  • Preface

    Publication Year: 1974, Page(s):1157 - 1158
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  • A Processor Controlled Telephone Switching System - TXE4

    Publication Year: 1974, Page(s):1276 - 1282
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    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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  • Telecommunications in Greece - Present and Future

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

    Publication Year: 1974, Page(s):1479 - 1481
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (375 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • CITEDIS Production PCM Public Telephone Switching System

    Publication Year: 1974, Page(s):1264 - 1268
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    After a short review of the interest in digital switching and network integration, a description of the CITEDIS system organization is given (CITEDIS is a digital exchange now in production), outlining its specific features and possibilities. The industrial aspect of CITEDIS manufacturing and the present manufacturing rate are then given. 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 (1528 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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  • 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 (392 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 last k symbols. 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 even... View full abstract»

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  • A Shipborne Antenna for Maritime Satellite Communications

    Publication Year: 1974, Page(s):1310 - 1325
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1360 KB)

    From a cost effectiveness point of view, the shipborne antenna is usually considered the most critical component in a shipborne terminal for maritime satellite communications (MARSAT). For possible use in such a system, a high gain autotrack antenna has been developed. The antenna utilizes a combined electronical and mechanical beam steering realized with two planar phased arrays mounted on a mech... View full abstract»

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  • Error Performance for Adaptive Transmission on Fading Channels

    Publication Year: 1974, Page(s):1331 - 1337
    Cited by:  Papers (29)
    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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  • RF Mixers Driven by Pseudorandom Signals

    Publication Year: 1974, Page(s):1424 - 1428
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Mixers driven with RF, biphase-modulated, pseudorandom signals are analyzed. The main properties considered are insertion loss and matching conditions. Application to Doppler radar is discussed. View full abstract»

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  • Surface Wave Device Applications in Microwave Communication Systems

    Publication Year: 1974, Page(s):1410 - 1419
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1256 KB)

    The application of certain prototype devices, already realized in the complementary surface acoustic wave (SAW) and magnetostatic wave (MSW) technologies, is examined in the context of analogue and digital microwave communications equipments. The specifications of Gaussian response IF bandpass filters and satellite channel multiplexing filters are detailed in the context of SAW designs. Extensions... View full abstract»

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  • Adaptive Sampling of Speech Signals

    Publication Year: 1974, Page(s):1189 - 1194
    Cited by:  Papers (1)
    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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  • New Telecommunication Systems Under Development in France

    Publication Year: 1974, Page(s):1481 - 1491
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1216 KB)

    This paper presents a review of the main telecommunications systems now under development in France. First, it gives the general objectives, the basic options, and the general design of the new electronic switching system E. 1 defined by CNET, with the principal characteristics of the E.10 and E.12 variants, and general planning of studies and development in process in this field. Then a summary o... View full abstract»

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  • Some New Results of Propagation Measurements and Their Application for Planning Transmitter Networks

    Publication Year: 1974, Page(s):1394 - 1402
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    To improve the coverage with medium frequency (MF) transmitters, new results of propagation measurements have to be recognized. Experiments were made to draw ground conductivity maps and to evaluate new propagation curves. Further measurements were begun to get information about the propagation with different polarization at MF. Great interest exists in preparing new frequency ranges for practical... 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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  • Recent Progress in Digital Processing of Speech

    Publication Year: 1974, Page(s):1168 - 1171
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    Current scientific efforts in the field of digital processing of speech are focused at the aims of improving the efficiency in the present state of the art, and of developing new digital speech communication systems. Therefore, thorough studies on the statistical characteristics of speech signals, speech coding, speech recognition, and speech synthesis are necessary. Recent results and actual tren... View full abstract»

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  • Picture Coding

    Publication Year: 1974, Page(s):1158 - 1167
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1304 KB)

    A survey of recent German research in the field of picture coding is presented. The described coding methods are mainly based on extended differential pulse-code modulation (DPCM) techniques. A unified model of a feedback switched quantizer for picture coding is explained. Theoretical results show a 9-dB gain in SNR over that of DPCM. A simple realization is shown. For encoding the 1-MHz videotele... View full abstract»

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  • Increasing Automation in the Special Telephone Services in West Germany

    Publication Year: 1974, Page(s):1283 - 1285
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Both authors have been involved with the development of special service equipment within the telephone Switching technique of the German Federal Post Office. The article in question reports on the state of automation of special telephone services in West Germany. The description includes systems already in existence and those still in the testing stage and also discusses the possibilities resultin... 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)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    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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  • Communications Research in Romania

    Publication Year: 1974, Page(s): 1492
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (79 KB)

    First Page of the Article
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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 (472 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... 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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  • On the Predicition of the Characteristic Parameters of Long-Distance Tropospheric Communication Links

    Publication Year: 1974, Page(s):1325 - 1331
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    This paper describes a technique for determining probability distributions of parameters necessary for the design of tropospheric scatter communication links. The method, resulting from earlier studies of scatter propagation and the structure of the troposphere, utilizes information which is easily obtained from routine conventional radiosonde observations. Examples of probability distributions, b... 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