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IEEE Transactions on Communications Systems

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  • Characterization of Randomly Time-Variant Linear Channels

    Publication Year: 1963, Page(s):360 - 393
    Cited by:  Papers (1429)  |  Patents (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3401 KB)

    This paper is concerned with various aspects of the characterization of randomly time-variant linear channels. At the outset it is demonstrated that time-varying linear channels (or filters) may be characterized in an interesting symmetrical manner in time and frequency variables by arranging system functions in (timefrequency) dual pairs. Following this a statistical characterization of randomly ... View full abstract»

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  • On Distributed Communications Networks

    Publication Year: 1964, Page(s):1 - 9
    Cited by:  Papers (274)  |  Patents (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1004 KB)

    This paper briefly reviews the distributed communication network concept in which each station is connected to all adjacent stations rather than to a few switching points, as in a centralized system. The payoff for a distributed configuration in terms of survivability in the cases of enemy attack directed against nodes, links or combinations of nodes and links is demonstrated. A comparison is made... View full abstract»

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  • Distributed Solution of Network Programming Problems

    Publication Year: 1964, Page(s):176 - 184
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (739 KB)

    A method is presented for the solution of network programming problems through the iterative execution of the same algorithm for each station of the network. At a given station, the algorithm requires data only from adjacent stations of the network. The theory of the method is developed through the use of electrical models of network programming problems. The techniques should be useful for the co... View full abstract»

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  • Switching of Reactive Elements in High-Q Antennas

    Publication Year: 1963, Page(s):254 - 255
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

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  • Automatic Tuning of High-Q Antenna For VLF FSK Transmission

    Publication Year: 1964, Page(s):110 - 115
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    A solution to the problem of increasing the bandwidth of a VLF antenna without decreasing the efficiency is to automatically tune the antenna to the transmitter frequency. Automatic tuning is achieved by means of two nonlinear inductors connected in series with the antenna tuning coil. The average inductance of these inductors are made to vary in accordance with an error signal derived from the ph... View full abstract»

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  • Block Quantization of Correlated Gaussian Random Variables

    Publication Year: 1963, Page(s):289 - 296
    Cited by:  Papers (263)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (737 KB)

    The paper analyzes a procedure for quantizing blocks ofNcorrelated Gaussian random variables. A linear transformation(P)first converts theNdependent random variables intoNindependent random variables. These are then quantized, one at a time, in optimal fashion. The output of each quantizer is transmitted by a binary code. The total number of binary digit... View full abstract»

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  • Optimizing High-Frequency Telegraph Transmission

    Publication Year: 1964, Page(s):104 - 107
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Recent technological developments in HF radio have increased its reliability and accuracy to a point where it rivals other media for long-distance data transmission. Economic considerations should justify growth in the application of HF circuits despite the development of new methods for transmission of intelligence. View full abstract»

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  • Combined Frequency and Time-Shift Keyed Transmission Systems

    Publication Year: 1963, Page(s):414 - 421
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (746 KB)

    Consideration is given to a transmission technique which is based on the combination of frequency-shift keying (FSK) and time-shift keying (TSK). In the resulting frequency and timeshift keyed (FTSK) transmission, the two possible states of a binary waveform are represented by the order of two pulses which occur on different frequencies, for instance, f1and f2. For example, i... View full abstract»

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  • Bandwidth and Spectra of Phase-and-Frequency-Modulated Waves

    Publication Year: 1963, Page(s):407 - 414
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (707 KB)

    The spectrum of a sinusoid, angle-modulated by a stationary Gaussian random process (GRP) of almost arbitrary spectrum, is investigated. Such a GRP provides a convenient model for voice signals, TV signals, and complex communication signals of other types. It is shown that the rms bandwidth of the modulated wave is the product of the rms bandwidth of the modulating wave and the rms angle modulatio... View full abstract»

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  • Correlation functions for the random binary wave

    Publication Year: 1963, Page(s):496 - 497
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (133 KB)

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  • The Future of Digital Communications

    Publication Year: 1963, Page(s):149 - 158
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (972 KB)

    The current global telecommunications plant, an estimated 50 billion dollar investment, is built around the 4-kc channel and frequency division multiplex (FDM). The characteristics of this 4-kc channel are uniquely suited to telephone communications at continental distances (mean of 2000 miles with a dynamic range varying from 200 to 6000 miles) and all but ignore predominately digital communicati... View full abstract»

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  • Multiple-Carrier Behavior of a Frequency-Selective Ferrite Limiter

    Publication Year: 1964, Page(s):138 - 150
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (915 KB)

    The ferrite limiter is a device which has the property of independently limiting two or more RF carriers if they are spaced by several megacycles from each other. This property may have utility in communication satellites as a multiple access tool or for minimizing the effects of jamming signals. The introductory section describes the device, its limiting action, and mode of operation in a commerc... View full abstract»

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  • A Nomograph for Predicting the Performance of Tropospheric Scatter Communication Circuits

    Publication Year: 1963, Page(s):138 - 142
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (735 KB)

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  • Distortion of SSB Transmission Due to AM-PM Conversion

    Publication Year: 1964, Page(s):166 - 176
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    It appears not to have been widely recognized that intermodulation distortion of a SSB-AM signal will be generated by AM-PM conversion effects present in amplifiers (such as traveling wave tubes), as well as by output-input nonlinearity. When the SSB-AM signal is carrying multichannel telephony this can be an important source of distortion. In the present paper, a formula is developed relating int... View full abstract»

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  • An Experimental SSB-FM System

    Publication Year: 1964, Page(s):222 - 229
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (718 KB)

    By the use of the proper combination of angle modulation and amplitude modulation, it is possible to generate a wave which may be detected without distortion on a conventional FM detector, but which has all its energy concentrated on one side of the carrier. A (SSB-FM) transmitter has been constructed by implementing each part of the mathematical equation for this wave. The signal generated by thi... View full abstract»

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  • Band Limitation and Error Rate in Digital UHF-FM Transmission

    Publication Year: 1963, Page(s):110 - 117
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (629 KB)

    The literature on systems design for the transmission of high speed digital data in the "megabits per second" range over UHF links is scarce and somewhat contradictory. Essentially, the designer is confronted with an optimization problem of finding the best compromise between radiated bandwidth, power balance, and output SNR, the latter being directly related to the error rate. Confining the analy... View full abstract»

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  • Performance of Digital Communications Systems in an Arbitrary Fading Rate and Jamming Environments

    Publication Year: 1963, Page(s):57 - 68
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1177 KB)

    The purpose of this theoretical investigation is to study the effects of fading rate on the performance of binary digital communications systems. The performance of three systems is evaluated from the aspect of probability of error per information bit when the desired and undesired signals are subject to statistically independent Rayleigh fading. Diversity reception is not included in the system c... View full abstract»

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  • Diversity Combination of Fading Signals with Unequal Mean Strengths

    Publication Year: 1963, Page(s):73 - 78
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (654 KB)

    This paper compares several techniques of diversity combination without placing the usual restriction requiring the mean signal-to-noise ratios on the various diversity branches to be equal. The probability distribution of the postcombination SNR is calculated for various cases, and it is shown that the shape of this distribution curve is not greatly affected either by the choice of diversity tech... View full abstract»

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  • The Effect of Frequency Selective Fading on the Binary Error Probabilities of Incoherent and Differentially Coherent Matched Filter Receivers

    Publication Year: 1963, Page(s):170 - 186
    Cited by:  Papers (164)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1736 KB)

    The presence of frequency-selective fading in a communication channel limits the maximum data rate capability of conventional communication systems. Surprisingly little analysis has been carried out to determine the effect of frequency-selective fading on digital (or analog) communication systems. This paper considers the effect of frequency-selective fading on the binary error probabilities of in... View full abstract»

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  • Storage Requirements for a Message Switching Computer

    Publication Year: 1964, Page(s):191 - 195
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (558 KB)

    A mathematical model which utilizes queuing theory is devised for estimating the storage requirements of a message switching computer. Since the storage needed for a message is proportional to the message length, the familiar derivation of a queue distribution in terms of the number of messages is not applicable. Instead the composite queue, resulting from a number of sending lines, is developed i... View full abstract»

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  • Computer Design and Control of Probabilistic Communication Networks

    Publication Year: 1963, Page(s):30 - 35
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (598 KB)

    A probabilistic communication network is one in which the nodes and links are subject to random failure (or destruction). For a class of such probabilistic networks-in which user traffic demands are converted and stated in terms of required number of circuits or trunks between each node pair-an optimum method of design and utilization (or control) is described. A linear programming model of the co... View full abstract»

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  • A Statistical Evaluation of Error Detection Cyclic Codes for Data Transmission

    Publication Year: 1964, Page(s):211 - 216
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (561 KB)

    Error data from about 350 hours of 1200-baud data transmission tests are used to evaluate cyclic error detection codes. For polynomials of low degree (<7), the ratio of undetected erroneous messages to total erroneous messages is inversely proportional to the period of the coding polynomial. In a commercial synchronous operation, the typical optimum block length (>4,000 digits) is such that ... View full abstract»

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Aims & Scope

This Transactions ceased publication in 1964. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope