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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
    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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  • 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
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    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
  • Analysis of Phase-Locked Timing Extraction Circuits for Pulse Code Transmission

    Publication Year: 1974, Page(s):1236 - 1249
    Cited by:  Papers (35)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB)

    An analysis is presented of the performance of phaselocked timing extraction circuits for baseband pulse code transmission. The phase error of the extracted timing wave is influenced by the properties of three essential stages in signal processing: prefiltering, nonlinear treatment, and narrow-band filtering. The analysis enables us to calculate quantitatively the quasi-static and the dynamic part... 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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  • Pharaon Urbain, A Digital Radio Relay System for Urban Areas

    Publication Year: 1974, Page(s):1226 - 1235
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    The radio relay system Pharaon Urbain has been conceived to realize the interconnection between switching and transit centers in urban areas. The first practical use of this system is planned in the urban zone of Paris, using the Maine-Montparnasse tower as a nodal point. This paper describes the system conception and the equipment of this first French urban radio relay system. View full abstract»

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  • Transmission of 4Ø-Phase-Shift Keyed Time-Division Multiple Access over Satellite Channels

    Publication Year: 1974, Page(s):1354 - 1360
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    The design of 60 Mbit/s/180 Mbit/s time-division multiple-access (TDMA) channels for the European Communication Satellite (ECS) system is analyzed and a possible configuration is suggested [1]. The effects of adjacent-channel interference, nonlinear power amplifiers both on the ground and in space, uplink and downlink noise are investigated and results are shown. Methods for carrier recovery are i... 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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  • Transmitter and Receiver Filters for Digital PAM Using Transversal Filters with Few Taps

    Publication Year: 1974, Page(s):1215 - 1225
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    Optimization in the mean-square sense of a transmitter and receiver filter for a time-discrete pulse-amplitude modulation (PAM) system is considered, assuming a situation of realizable filters. This means a general departure from the common matched filter-periodic filter receiver structure. The minimization is carried out with respect to both intersymbol interference and noise, assuming that both ... View full abstract»

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  • Recent British Work on Millimetric Waveguide Systems

    Publication Year: 1974, Page(s):1378 - 1390
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1480 KB)

    A comprehensive United Kingdom program of research and development on guided millimetric waves concentrates its main effort on a 50-mm internal diameter lightweight helix waveguide, but a lightweight dielectric-lined waveguide is also being investigated. A full-scale Post Office/industry field trial over a 14.1-kin route is scheduled for 1975. Problems of mechanical construction of waveguides are ... View full abstract»

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  • 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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  • Communications in Israel

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

    First Page of the Article
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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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  • 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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  • Evolution of Store-and-Forward Techniques

    Publication Year: 1974, Page(s):1297 - 1301
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    This paper attempts to establish a connection between the different factors that influence the structure and procedures of the various store-and-forward systems and their ability to meet user needs. 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
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1544 KB)

    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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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