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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 (1421)  |  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 (273)  |  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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  • Intelligible Crosstalk Between Frequency Modulated Carrers Through AM-PM Conversion

    Publication Year: 1964, Page(s):160 - 166
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (595 KB)

    When two or more frequency modulated signals are transmitted simultaneously through a nonlinear device, intelligible crosstalk from one signal to another is a potential problem. Such a situation arises in connection with the multicarrier use of satellite transponders. In this paper, intelligible crosstalk arising from transmission vs frequency deviations followed by amplitude-to-phase (AM-PM) conv... 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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  • On Binary Data Transmission Error Rates Due to Combinations of Gaussian and Impulse Noise

    Publication Year: 1963, Page(s):428 - 435
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    Error rates are computed for a binary data transmission system subject to both Gaussian and impulse noise. The rates are displayed as a function oflambdaT, whereTis the signal duration and λ-1is the average time between noise pulses. Poisson-distributed impulse noise and periodically recurring noise pulse clusters are considered. Error rates are computed for c... View full abstract»

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  • Logarithmic PCM Encoding Without Diode Compandor

    Publication Year: 1963, Page(s):296 - 307
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1075 KB)

    Instantaneous companding is a useful technique for the improvement of the transmission quality of PCM systems. In this paper various nonlinear encoding and decoding techniques without using diode compandors are stated with a focus on the logarithmic decoders, which are composed of cascaded attenuators. Hyperbolic sinusoidal law is also derived from the logarithmic law and is obtained by an attenua... View full abstract»

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  • Power Amplifier Linearity Studies for SSB Transmissions

    Publication Year: 1964, Page(s):150 - 159
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1114 KB)

    Intermodulation distortion measurements were made on traveling-wave tube amplifiers to determine the suitability of this tube type for use in single-sideband (SSB) frequency division multiplex transmitters. It was found that coupled cavity tubes exhibit better intermodulation distortion properties (by a factor of 5 or 6 db) than helix tubes. By employing a direct narrow-band feedback loop around a... 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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  • 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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  • Finding the Most Reliable Routes in Communication Systems

    Publication Year: 1963, Page(s):402 - 406
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    It is shown that the problem of finding the most reliable route between two stations in a communication system can be reduced to the problem of finding the shortest path between two nodes in a weighted linear graph. The known methods for finding the shortest path in a linear graph are extended to apply to any communication system, and simplified algorithms and computer subroutines are presented. 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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  • A Time Slot Interchange System in Time-Division Electronic Exchanges

    Publication Year: 1963, Page(s):336 - 345
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (774 KB)

    A system of time-division exchange is proposed in which the time slots are independently assigned to the originating and terminating subscribers and are interchanged, in setting up connection, by means of an appropriate delay or memory device. Such a system, which is economically feasible if the code modulation techniques are employed, increases the efficiency by avoiding time slot mismatch loss a... View full abstract»

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  • Error Rate Approximations for Differential Phase-Shift Keying

    Publication Year: 1964, Page(s):18 - 27
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (825 KB)

    In this paper, we present an analysis of the performance of a model of the Differential Phase Shift Keying (DPSK) system. The method employed consists of deriving the test statistic for choosing between any two phases when an arbitrary phase is transmitted. The characteristic function of the test statistic is derived, and from this, the decision probability, i.e., the probability of choosing betwe... View full abstract»

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  • Rapidly converging sample weighting functions

    Publication Year: 1964, Page(s):116 - 117
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    In this communication, a family of sampling formulas are developed which have better convergence properties than the standard formula based on amplitude samples taken at the Nyquist rate. Sampling is done at higher than the minimum rate and a sampling function, whose Fourier transform has cosine tapered skirts, is used. Suitable choice of the taper results in a formula with no "crosstalk" at the s... View full abstract»

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  • Solar Radio Interference as a Function of Frequency and Time Associated Ionosphere Disturbances

    Publication Year: 1963, Page(s):79 - 88
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1337 KB)

    In the following study radio emissions from the sun are considered under the separate headings of 1) the quiet sun component, 2) the slowly varying component, and 3) the catastrophic component. An attempt is made to establish some statistics as to the percentage of time that the sun is likely to produce interference in radio communications at frequencies within the "atmospheric window" and an opti... View full abstract»

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  • Optimization of Subchannel Data Rate in FDM-SSB Transmission over Selectively Fading Media

    Publication Year: 1964, Page(s):46 - 53
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    In radio channels both time-selective and frequencyselective fading effects distort the transmitted signal. The present paper determines the effect of time and frequency selective fading upon the binary error probabilities of incoherent matched filter receivers employing postdetection diversity combining. General analytical results are specialized to the case of phase-continuous FSK and a Gaussian... View full abstract»

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  • Synchronization

    Publication Year: 1963, Page(s):481 - 491
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1203 KB)

    The purpose of the panel is to spread knowledge and shed light on the problems of synchronization and to take steps toward the formulation of a theoretical framework which will also assist the practitioner. We are engaged in an attempt to point out to practicing engineers some of the things which are already well known and relatively obvious from a theoretical standpoint so that, hopefully, the ti... View full abstract»

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  • Performance of Coherent Detection Systems Using Decision-Directed Channel Measurement

    Publication Year: 1964, Page(s):54 - 63
    Cited by:  Papers (38)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    A receiver which employs coherent, or synchronous, detection must have knowledge of the phase of the received signal. In general, the receiver acquires this knowledge from sighals received previously over the channel. The result of this measurement process is a noisy phase reference which is then used by the receiver in the detection of the incoming signals. In this paper the effect of using baud ... View full abstract»

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  • Application of Network Synthesis to Broadbanding of Low-Frequency Antennas

    Publication Year: 1964, Page(s):237 - 250
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1181 KB)

    Being quite narrow, the bandwidth of low-frequency transmitting antennas is often insufficient for modern communication requirements. Some physical reconstruction of the existing antenna, or damping of the output circuit may be used for broadbanding. In this paper, a method of synthesis for broadbanding coupling networks is shown, together with curves relating the Chebyshev and Butterworth types o... View full abstract»

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  • A lower bound on the cross correlation between signals of prescribed energy

    Publication Year: 1964, Page(s): 251
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (98 KB)

    The author describes how to derive the average cross-correlation as ⩾ [-1/(n-1)] (average signal energy), where the averaging is over the ensemble of signals. In the important special case in which all signals have the same energy E and all the cross-correlations are made equal to R, this result reduces to the constraint R ⩾ -[E/(n-1)]. View full abstract»

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  • Radio Communications via Rock Strata

    Publication Year: 1963, Page(s):159 - 169
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (937 KB)

    The communications potential of radio wave propagation through rock strata in the earth's crust is discussed. Included are geological and geophysical considerations pertinent to communications system design. Expressions are given for radio wave attenuation and wavelength, performance factors of bare and insulated linear antennas, and transmission loss between antennas immersed in dissipative media... View full abstract»

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  • Error rate of a cascaded pair of rayleigh fading communication links

    Publication Year: 1963, Page(s):354 - 355
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    First Page of the Article
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  • Non-Gaussian Atmospheric Noise in Binary-Data, Phase-Coherent Communication Systems

    Publication Year: 1963, Page(s):280 - 284
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (509 KB)

    Performance evaluation of a binary-data phasecoherent system is presented for the case when interference is confined to the non-Gaussian component of atmospheric noise. As a first step, a mathematical model of the non-Gaussian component of atmospheric noise in narrow bandwidths is formulated which, for high instantaneous noise voltages, coincides exactly with the empirical atmospheric noise data. ... View full abstract»

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  • On a Slope-Quantized Ternary PCM

    Publication Year: 1964, Page(s):217 - 222
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (505 KB)

    A new method of coding complex signals based on 3-unit (+1,0,-1) quantization of their slopes, similar to the equalslope approximation used in network synthesis, and the resultant modulation schemes have been investigated. Using some compression and equalization, the optimum SNR for sinusoidal signals is found to be 25-34 db for the PRF of 20-60 kc. When feedback is used from a local receiver to t... 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