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IRE Transactions on Communications Systems

Issue 3 • Date September 1961

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Displaying Results 1 - 24 of 24
  • [Front cover and table of contents]

    Publication Year: 1961, Page(s): 0
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    Freely Available from IEEE
  • Our expanding resposibilities

    Publication Year: 1961, Page(s): 193
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  • A Technique for Lowering the Noise Threshold of Conventional Frequency, Phase and Envelope Demodulators

    Publication Year: 1961, Page(s):194 - 206
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1448 KB)

    Envelope, phase and frequency demodulators exhibit a stronger-signal capture phenomenon which enables the noise to suppress the signal when the signal is the weaker of the two, and the signal to suppress the noise when the reverse is true. The presence of the noise thus imposes a threshold that must be exceeded by the signal for proper envelope, phase or frequency demodulation. A general discussio... View full abstract»

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  • Binary Error Rates in Fading FDM-FM Communications

    Publication Year: 1961, Page(s):206 - 214
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (992 KB)

    This paper discusses the transmission of binary data over a fading frequency-division multiplexed FM (FDM-FM)radio system. The important results are convenient design formulas for binary error rate in terms of the symbol duration, the IF bandwidth, the per channel rms frequency deviation, the average received carrier-to-noise ratio, and the particular types of binary detection and diversity combin... View full abstract»

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  • Reduced-Time Facsimile Transmission by Digital Coding

    Publication Year: 1961, Page(s):215 - 222
    Cited by:  Papers (7)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1025 KB)

    The growing importance of digital communication links has resulted in a family of coding methods designed to achieve reduced-time digital facsimile transmission. This paper reports on a study of the effectiveness and feasibility of one of these methods, Run Length Coding (RLC). RLC is a well-known digital method in which the area and shade of the copy are quantized to form a mosaic pattern. Neighb... View full abstract»

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  • A Technique for Improving the Intelligibilty of Speech Transmitted by Amplitude Modulation over Noisy Channels

    Publication Year: 1961, Page(s):222 - 225
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (419 KB)

    This paper describes a limited experimental study of a technique for enhancing the intelligibility of speech transmitted by amplitude modulation over noisy channels. The technique requires that the two sidebands of the received signal be demodulated separately by conventional single-sideband methods, and that the resulting audio signals be presented to the listener via headphones as binaural stimu... View full abstract»

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  • Jamming Vulnerability of Communication Systems

    Publication Year: 1961, Page(s):226 - 232
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (699 KB)

    This paper presents the procedure for evaluating the jamming vulnerability of a communication system. The factors considered include system performance under laboratory conditions, characteristics of transmission channels, power and transmitter design of jammer, and the costs of desired communication and jamming systems. View full abstract»

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  • The Sideband Intermediate Frequency Radio Communications System

    Publication Year: 1961, Page(s):232 - 238
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (691 KB)

    A communications system is described which eliminates oscillator-frequency drift problems by incorporating an amplitude modulated transmitter modulated by an oscillator tuned to half the intermediate frequency of the receiver. The use of a balance modulator elimates the carrier and allows energy at the two sideband frequencies to be propagated to a receiver. In the receiver these two sidebands are... View full abstract»

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  • Techniques for Comparing Modulation Methods for Data Transmission over Telephone Channels

    Publication Year: 1961, Page(s):239 - 243
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (878 KB)

    A program has been initiated for study of complete data communication systems by a general purpose analog computer. Complete PM and FM systems including transmitter, receiver, and channel have been simulated. Illustrative results and a discussion of criteria of performance are presented. View full abstract»

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  • New Equipment for Experiments on Data Transmission and Error Analysis

    Publication Year: 1961, Page(s):244 - 246
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (294 KB)

    This paper describes the test equipment which was used jointly in 1959 by Post Office authorities and IBM for evaluation of the data transmission feasibility over European telephone networks. A summary of the results gained is displayed and demonstrates the feasibility of data transmission even if many problems are still to be solved. In the second part of the paper a method for recording and anal... View full abstract»

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  • The Telephone Channel in a Global Communications System

    Publication Year: 1961, Page(s):247 - 252
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    The nominal 4-kc telephone channel is by far the most dominant parameter of contemporary telecommunication networks. It is, directly or otherwise, underwritten by a world-wide investment of the order of fifty billion dollars. The engineering of present and future global communication networks must therefore provide for working with and into such channels, concomitantly with finding avenues out of ... View full abstract»

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  • Start-Stop Data Transmission Without the Stop Element

    Publication Year: 1961, Page(s):252 - 258
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (675 KB)

    The existing start-stop telegraph system as used in the telex service allows for the transmission of 400 telegraph characters per minute when the CCIT recommended speed of 50 bauds is used. The signals comprise a start element and 5 information elements, each of unit length (20 msec), and a stop element with a duration of I 1/2 units, so that a telegraph signal of this type has a duration of 150 m... View full abstract»

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  • Telegraph Distortion on High-Speed Frequency Shift Data Transmission Systems

    Publication Year: 1961, Page(s):259 - 270
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1052 KB)

    First, the distortion due to the telephone channel is calculated by considering the instantaneous frequency of the transmitted signal, the telephone channel being defined in terms of its frequency characteristics: attenuation and group delay. The results are easily obtained when the signal is recurrent. Calculations have been carried out on a particular binary signal, for some typical telephone li... View full abstract»

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  • Some Results of Data Transmission Tests Over Leased Telephone Circuits

    Publication Year: 1961, Page(s):271 - 275
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (481 KB)

    Data transmission tests were performed on leased telephone circuits using two different sets of terminal equipments. The first applied phase-reversal modulation (PM), the second, frequency-shift keying (FSK). The transmission speeds were 750 or 1625 baud in the former and 750 or 1500 baud in the latter case. Nine different circuits, having an average length of 980 km, were tested. Only erroneous b... View full abstract»

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  • Oblique-Sounding and HF Radio Communication

    Publication Year: 1961, Page(s):275 - 279
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (554 KB)

    The sweep-frequency oblique sounder is a powerful tool for the study of ionospheric propagation over actual communication circuits. In addition, since it provides the pulse response of the ionosphere as a function of frequency it is potentially a powerful tool for improving communication via the ionsphere. The Defence Research Telecommunications Establishment's (DRTE) experience in using sweep-fre... View full abstract»

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  • Information Bandwidth of Tropospheric Scatter Systems

    Publication Year: 1961, Page(s):280 - 287
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (642 KB)

    A set of design curves of peak intermodulation distortion due to frequency selective fading, as a function of information bandwidth, is derived for tropospheric scatter systems. These curves are applicable to systems frequency-modulated with frequency-division multiplexed telephone and telegraph channels. A two-ray tropospheric scatter model was selected in order to derive general results. This, h... View full abstract»

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  • The Economical Design of Radio Communication Systems by Matching the Message Urgency to the Fading Conditions

    Publication Year: 1961, Page(s):288 - 291
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (393 KB)

    A "matched-traffic technique" is proposed to control the hourly traffic volume so that the capability of the system is designed only to carry the urgent messages that require immediate transmission at the desired reliability. The urgent messages carried by preferred channels will be transmitted as usual all the times while the nonurgent messages carried by delayed channels will be transmitted when... View full abstract»

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  • Universal Combined Radio Relay and Tropospheric Scatter Equipment [Equipment Group AN/FRC-( )]

    Publication Year: 1961, Page(s):292 - 297
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (610 KB)

    The characteristic distinguishing this equipment group resides in the words "Equipment", "Universal" and "Combined''. As conceived by Rome Air Development Center, this approach is aimed to bring about a matrix of least-common buildingblock equipments with the built-in flexibility for mutual fit to make up any required radio relay or tropospheric scatter subsystem. It is intended that the resulting... View full abstract»

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  • Correction [to "Some recent developments in digital feedback communication systems"]

    Publication Year: 1961, Page(s): 297
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    Summary form only given, as follows. The author of the above-named work, which appeared on pages 51-57 of the March, 1961, issue of these Transactions, requested the following addition to his paper: "The research reported was performed at New York University, N.Y., under the sponsorship of the Air Force Command and Control Development Division, Air Research and Development Command, Laurence G. Han... View full abstract»

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  • Planning Aspects of Globe-Circling Communications System of High Capacity, Reliability, and Performance Quality

    Publication Year: 1961, Page(s):298 - 311
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1483 KB)

    The need for very long-haul circuits of high-quality has developed considerably over the last few years. Recent developments in the under-seas cable field indicate that a global cable network might be devised to solve much of this traffic problem. A review is made of the basic considerations which enter into the planning of such a network, and it is pointed out that political difficulties may toda... View full abstract»

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  • Integration of Independently Designed Military Communication Systems

    Publication Year: 1961, Page(s):312 - 316
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    The existence of many special purpose military communication systems will be pointed out, and the efficiency resulting from integrating these separate systems is discussed, as against the technical complexities involved in modifying them for interconnection. The various degrees of integration is considered, from maintaining separate channels on shared-baseband systems to complete interconnection f... View full abstract»

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  • System Utilization of Electronic Frankensteins

    Publication Year: 1961, Page(s):316 - 319
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    Short-sighted system planning has resulted in the evolution and system mix of both megawatt and microwatt power level equipments with little concern for the over-all system degradations which result from sub-system interactions. Unfortunately the effects of these interactions are often felt far beyond the immediate system. As a result, the full use of extremely sensitive sensors and detectors, whi... View full abstract»

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  • A Laboratory Comparison of Maximal-Ratio Combiners and Optimal Selectors for Fading HFSK Channels

    Publication Year: 1961, Page(s):320 - 321
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (170 KB)

    Experimental results are described to demonstrate the superiority of a maximal ratio combiner (or ratio squarer) over an optimal selector in the reception of fading HFSK signals. View full abstract»

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  • [Back matter]

    Publication Year: 1961, Page(s): 0
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Aims & Scope

This Transactions ceased publication in 1962. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope