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IRE Transactions on Communications Systems

Issue 4 • December 1961

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Displaying Results 1 - 25 of 26
  • [Front cover and table of contents]

    Publication Year: 1961, Page(s): 0
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    Freely Available from IEEE
  • Meeting the challenge ahead

    Publication Year: 1961, Page(s): 327
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    Freely Available from IEEE
  • Link Error Control and Network Route Selection

    Publication Year: 1961, Page(s):328 - 334
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (785 KB)

    Military networks must deliver messages during periods of high noise. On a link basis, character reliability can be increased using decision feedback for error control. Two specific decision feedback schemes are described in detail. The improved reliabilities and the reduced capacities for information transfer are computed. A method is then given for determining the optimal message route between e... View full abstract»

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  • An Automatic Computer-to-Computer Digital Communications System

    Publication Year: 1961, Page(s):335 - 342
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (884 KB)

    This paper discusses the design of an automatic on-line computer-to-computer intercommunications system with locations at several data processing centers throughout the world. The solution to the problem is developed in logical order starting with the selection of a transmission medium. Leased private wire telephone facilities were found to be the best world-wide common denominator for economicall... View full abstract»

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  • Analysis of a PCM System Employing a PPM Vernier

    Publication Year: 1961, Page(s):342 - 349
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    The upper limit to the output SNR of sampled-data PCM systems is set by the quantization noise. The present study is concerned with a method of overcoming this limitation by employing time shifting of the PCM pulse groups so as to constitute an analog encoding of the difference between the sample amplitude and the nearest quantization level. Thus PCM is introduced to serve as a vernier to PPM. For... View full abstract»

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  • Linear Reconstruction of Quantized and Sampled Random Signals

    Publication Year: 1961, Page(s):350 - 355
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (579 KB)

    Techniques for optimal mean-square linear reconstruction from quantized samples of a random signal and the resulting errors are discussed in this paper. The signal is assumed to be wide-sense stationary with Gaussian statistics. The shape of the sample pulse is arbitrary. It is shown that the pulse shape has no effect upon the minimum mean-square error. An optimal linear filter for reconstruction ... View full abstract»

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  • Effects of Impulse Noise on Digital Data Transmission

    Publication Year: 1961, Page(s):355 - 361
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (894 KB)

    This paper presents the basic characteristics of impulse noise and its effects on various types of binary data transmission systems. The sources and properties of such impulsive noise, in contrast to Gaussian noise, are discussed. A method is described for the experimental comparative evaluation of bit error rates in the presence of additive impulse noise. The method is shown to permit unique comp... View full abstract»

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  • On the Potential Advantage of a Smearing-Desmearing Filter Technique in Overcoming Impulse-Noise Problems in Data Systems

    Publication Year: 1961, Page(s):362 - 366
    Cited by:  Papers (17)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (517 KB)

    It has long been recognized that impulse noises or even very short duration line interruptions are the most vicious form of interference affecting data communications over wire lines. These noises, while annoying, are not catastrophic in voice communications because of the inherent redundancy in speech sounds. If a degree of apparent redundancy can be inserted into a data stream, the serious degra... View full abstract»

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  • Effect of Terrestrial Electromagnetic Storms on Wireline Communications

    Publication Year: 1961, Page(s):367 - 377
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1326 KB)

    Effects of natural electromagnetic phenomena on wireline circuits are discussed. An important factor causing degradation of system operation or damage to equipment is the occurrence of earth currents, or geoelectric variations, associated with electromagnetic storms. Three to six earth-current storms occur yearly, during and after the maximum of the sunspot cycle. Peak disturbances last 10 to 30 m... View full abstract»

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  • Statistics of Hyperbolic Error Distributions in Data Transmission

    Publication Year: 1961, Page(s):377 - 382
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (510 KB)

    Error bursts in data transmission systems do not usually occur completely at random. It has been found that often they follow a hyperbolic rather than a Poisson distribution. Several statistical quantities consistent with the hyperbolic distribution have been developed. These are compared with the corresponding quantities for a Poisson distribution. Specifically, the quantities are the probability... View full abstract»

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  • A Long Range Digital Communicaton System

    Publication Year: 1961, Page(s):383 - 389
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    With the arrival of digital data-processing techniques, it becomes necessary both to increase the speed of communication between the data-processing and automatic control equipments and to increase the reliability with which the data are transmittedparticularly over comparatively long ranges. With the immense number of systems that must be developed to provide the everincreasing amount of data pro... View full abstract»

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  • The Long Range Subsurface Communication System

    Publication Year: 1961, Page(s):390 - 396
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (715 KB)

    Discussed herein is a point-to-point communication system for ranges in the order of hundreds of miles where the transmitting and receiving equipment, including radiating devices, can be buried deep underground. Results of theoretical analyses and subsequent experimental verifications of various aspects of the communication system have been presented in this paper. Problems on the optimization of ... View full abstract»

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  • Long Line System for Global Communications

    Publication Year: 1961, Page(s):396 - 398
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    Some aspects of the entire global telecommunication system are considered with emphasis on transmission delay and circuit instabilities. Some calculations are made using CCITT recommendations. Attention is then focused on the local networks and terminal equipment and their relation to the entire system. View full abstract»

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  • The Dwindling High-Frequency Spectrum

    Publication Year: 1961, Page(s):399 - 408
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1082 KB)

    The bulk of the world's long-distance communications presently takes place in the high-frequency radio spectrum (between approximately 3 and 30 Mc), by means of ionospheric reflection. The ionosphere is formed mainly by ultraviolet radiation emitted from the sun, and its capability to reflect HF radio waves varies diurnally, seasonally, geographically and throughout the sunspot cycle. While the ph... View full abstract»

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  • Frequency Division Multiplexing on Transoceanic Cables

    Publication Year: 1961, Page(s):408 - 412
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    Heretofore cable, land-line telegraph, and microwave channeling has been limited to approximately 1100 bits per second (bauds), utilizing 22 subcarriers spaced 120 cps apart. Frequency shift keying, together with more sophisticated filter design, has enabled this capacity to be doubled. High data transmission speeds require frequency division multiplexing in order to reduce the distortion in the r... View full abstract»

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  • A New Frequency-Division Radiotelegraph Multiplex System (MADFAS)

    Publication Year: 1961, Page(s):412 - 416
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (482 KB)

    A frequency-division multiplex system (MADFAS) is described for operation at HF with less bandwidth than is commonly allowed. The reduction in required bandwidth is achieved by using oscillators with greater frequency stability, and signaling by FSK with the minimum frequency shift compatible with the keying speed. Details on the design and operational characteristics of the system are presented. View full abstract»

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  • Some Design and Application Considerations of a 600-Channel Military Multiplex System

    Publication Year: 1961, Page(s):417 - 427
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    An applications review is presented of a singlesideband suppressed-carrier 600-channel all-transistorized multiplex system for use on cable, and line-of-sight or tropospheric scatter radio circuits. System flexibility provides for growth in 12-channel increments up to the full channel complement. Highly ruggedized modular construction, and miniaturized printed-circuit techniques are employed throu... View full abstract»

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  • Equipment Configuration and Performance Criteria for Fully Optimized Tropospheric-Scatter Systems

    Publication Year: 1961, Page(s):427 - 433
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (735 KB)

    The "optimum" system is examined with the aid of a basic equation related to channel SNR. Expressions are then developed which show that for equal channel loading and capacity, FM systems are likely to be superior to SSB systems for normal voice channel operation. Further improvement in FM performance may be achieved with "phase-locked" receivers. Performance equations for such receivers are used ... View full abstract»

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  • Result of Bandwidth Tests on the 185-Mile Florida-Cuba Tropospheric Scatter Radio System

    Publication Year: 1961, Page(s):434 - 439
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (610 KB)

    Some proposed tropospheric scatter paths are several hundred miles long, and their geometry suggests the possibility that the increased relative delays of signal components traveling the higher-altitude paths could result in significant interchannel modulation interference in an FM system. Therefore, a program of experimental investigation has been undertaken by Bell Telephone Laboratories to dete... View full abstract»

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  • Path Loss Measurements vs Prediction for Long Distance Tropospheric Scatter Circuits

    Publication Year: 1961, Page(s):439 - 445
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (743 KB)

    Before any communications circuit can be established between two points, whether it be by wire lines, or by tropospheric or ionospheric radio propagation, a thorough knowledge of the intended path should be obtained so that an efficient and economical installation can be made. Each system should have as high a reliability as is required for its intended use. Tropospheric forward scatter circuits h... View full abstract»

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  • Interdependence Between Hourly Median Transmission Loss and Surface Refractivity Index Observed at 900 Mc on a 232-Mile Far-Beyond-the-Horizon Path

    Publication Year: 1961, Page(s):445 - 450
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (622 KB)

    A detailed analysis is made of propagation data obtained from the North Atlantic Scatter System installed in Iceland. In particular, the correlation of the transmission loss and meteorological observations on a long path is analyzed in detail. By separating the data into various time periods, it is shown that for periods of time during which the received field is lowest, the correlation between tr... View full abstract»

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  • Parametric Converter Performance on a Beyond-the-Horizon Microwave Link

    Publication Year: 1961, Page(s):451 - 455
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (678 KB)

    Experimental parametric converters were installed on a quadruple-diversity link of the White Alice system. Two parametric receivers with noise figures of 1.5 db were operated simultaneously with two normal receivers of 8.8-db noise figures. Comparative measurements showed improvements of 7 db in telephone-channel noise and 10-fold in teletype error-rates. View full abstract»

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  • An 11,000-Mc Radio System Across Chesapeake Bay

    Publication Year: 1961, Page(s):455 - 459
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    This paper describes briefly the Western Electric type TJ microwave Radio System designed for operation in the 10.7 to ll.7-kMc frequency allocation, and covers the performance of this system since it was placed in service across Chesapeake Bay on February 1, 1959. This is the first TJ system to be placed in service in the territory of The Chesapeake and Potomac Telephone Company of Virginia, and ... View full abstract»

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  • Coexistence of Celestial and Terrestrial Communications

    Publication Year: 1961, Page(s):460 - 462
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Artificial satellite repeaters will revolutionize radio communication by permitting the use of microwaves over long paths. There will also be a continuing and mounting need for terrestrial applications of microwave services over relatively short distances. Achieving coexistence between these long- and shortdistance systems will conserve and enhance the utilization of the microwave spectrum. Extens... View full abstract»

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  • Mutual Interference in Communication Equipment Can Be Reduced

    Publication Year: 1961, Page(s):462 - 469
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (955 KB)

    The application of well-known techniques in the re-examination of existing systems, aided by interference charts to identify areas of greatest vulnerability, will prolong the useful life of present equipment and guide designers of future systems to meet advancements in the state of the art. View full abstract»

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Aims & Scope

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

Full Aims & Scope