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IEEE Transactions on Communication Technology

Issue 5 • Date October 1968

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Displaying Results 1 - 18 of 18
  • [Front cover and table of contents]

    Publication Year: 1968, Page(s): 0
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    Freely Available from IEEE
  • Project for a Digital Telephone Network

    Publication Year: 1968, Page(s):633 - 648
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1721 KB)

    A digital communication network is proposed that would integrate present telephone services and switched mediumspeed data or facsimile channels into a single general-purpose system. Efficient use of the cable plant is made through decentralization of switching and centralized control. Subscribers are connected to voice or data concentrators, and switching between different digital trunks is done i... View full abstract»

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  • An Adaptive Receiver for Signals of Unknown Frequency

    Publication Year: 1968, Page(s):648 - 656
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (874 KB)

    The problem of detection of signals of unknown frequency is analytically described and statistical decision theory is applied to determine the receiver that optimally uses past data to improve present performance. The theoretical peformance of this optimum adaptive receiver is compared with two nonadaptive receivers (the energy detector and an optimum nonadaptive receiver) and it is found that in ... View full abstract»

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  • Communication at Low Date Rates - Spectral Analysis Receivers

    Publication Year: 1968, Page(s):657 - 668
    Cited by:  Papers (2)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1069 KB)

    The purpose of this paper is to introduce a multiple frequency shift keying spectral analysis receiver based on the fast Fourier transform. A novel decision-directed automatic frequency control (AFC) for use with the fast Fourier receiver is mentioned. Not only is the system to be described better than a truncated autocorrelation receiver, the analysis required is unorthodox, being based on the fa... View full abstract»

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  • M-ary Sequential Detection for Amplitude-Modulated Signals in One and Two Dimensions

    Publication Year: 1968, Page(s):669 - 675
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (546 KB)

    M -ary sequential tests are proposed and analyzed for amplitude-modulated signals that can be represented in a one-or two-dimensional signal space. Coherent detection in Gaussian noise has been assumed. Expressions for the probability of error and average sample size are found as a function of the threshold constants. The probability of error as a function of t... View full abstract»

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  • A Contribution to the Multiple-Polarity Coincidence Detection Schemes

    Publication Year: 1968, Page(s):676 - 682
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (503 KB)

    A new approach to multiple-polarity coincidence schemes has led to a relatively simple detector that is superior when compared to other diversity detectors. The new detector is also nonparametric and operates well in general noise environments. View full abstract»

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  • Digital Computer Simulation of a Frequency-Shift Keying System

    Publication Year: 1968, Page(s):683 - 690
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (649 KB)

    A digital computer simulation of a noise-free frequency-shift keying (FSK) data system is described. This system consists of a frequency modulator, a send and receive bandpass filter, a limiter, and a frequency demodulator. The simulation is used to study the performance of the system in terms of telegraph distortion for various filters and demodulators. The accumulated spectral density of the mod... View full abstract»

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  • Analysis of Some Techniques Used in Modern LF-VLF Radiation Systems

    Publication Year: 1968, Page(s):690 - 700
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (842 KB)

    A technique for radiating relatively broad-band pulses from narrow-band antennas is presented and analyzed. Good efficiency and bandwidth are obtained through the techniques of 1) forcing the antenna current to rise to the required level within the required time, and 2) feedback of stored energy from the high-Q antenna to the power supply during the pulse decay. A sample computation is made on a L... View full abstract»

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  • Noise Loading Analysis of a Third-Order Nonlinear System with Memory

    Publication Year: 1968, Page(s):701 - 712
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (928 KB)

    This paper presents the noise loading analysis of a third-order nonlinear system characterized by Volterra kernels. The analysis is of practical interest since intermodulation distortion is often a limiting consideration in the design of solid-state long-haul broad-band frequency-division multiplexed transmission systems, and since speech on such systems is best represented by zero mean Gaussian n... View full abstract»

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  • Thermal and Intermodulation Noise due to Two-Path Propagation in FM-FDM Systems Using Space Diversity

    Publication Year: 1968, Page(s):713 - 720
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (737 KB)

    Space diversity schemes are studied in terms of the relative outage probability for two-path propagation conditior.s. The outage is considered as due to thermal and intermodulation noise in FM-FDM transmission for both selection and combining schemes. The discussion includes common control systems where diversity conditions in several RF channels are controlled by information obtained at a single ... View full abstract»

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  • Multiple-Access Tradeoff Study for Intra-South American Satellite Communication System

    Publication Year: 1968, Page(s):721 - 730
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (882 KB)

    This paper concerns two important aspects of a multiple-access tradeoff study for an intra-South American satellite communication system: 1) the radio-frequency transmitter power in both the satellite and the earth stations (particularly the former which is at a preminm) needing to give acceptable telephone channel signal-to-noise ratio performance; 2) the bandwidth requirements in both the satell... View full abstract»

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  • A Hybrid Cross-Correlation Data Processing System

    Publication Year: 1968, Page(s):731 - 736
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    A telemetry data processing system based on crosscorrelation techniques and maximum-likelihood detection principles and designed to decode a special type of pulse-code modulated (PCM) signals, pulse-frequency modulation (PFM), is discussed. The decoding system employs a high-speed multiple-pass tape scanner to sequentially generate a set of correlation indices for each data word using the alphabet... View full abstract»

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  • Correction to "Probablities of error for adaptive reception of M-phase signals"

    Publication Year: 1968, Page(s): 736
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    Presents revisions to equations 4, 5, 6 and 11 and formulas for the above-named article. View full abstract»

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  • Idle Channel Noise of Delta Modulation

    Publication Year: 1968, Page(s):737 - 742
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (531 KB)

    The basic properties of idle channel noise in a delta modulation (\Delta M) system are determined. Analytical results are used to predict the noise waveform that the decoder will receive as well as the power level of the received noise. Experimental and computational results are in good agreement. View full abstract»

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  • Irreducible Error-Rate Performance of Phase-Shift Keyed Signals over Correlated Dual-Diversity Channels

    Publication Year: 1968, Page(s):743 - 746
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (381 KB)

    Dual-diversity reception of 1- and 2-bit per baud differentially coherent phase-shift keyed signals over correlated Rayleigh fading channels is investigated. The mechanism that produces irreducible errors is signal distortion due to multiplicative noise. No additive noise is assumed to be present. As the fading correlation coefficient approaches unity or zero, the system error probability approach... View full abstract»

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  • Equivalence of FM Threshold Extension Receivers

    Publication Year: 1968, Page(s):746 - 748
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (350 KB)

    FM threshold extension is achieved in the phaselocked loop (PLL), the frequency-locked loop (FLL), or the frequency demodulator with feedback (FMFB). In this paper the FLL and PLL with respect to their defining equations are shown to be limiting forms of the FMFB. View full abstract»

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  • Further Results Concerning the Effect of Frequency-Selective Fading on Differentially Coherent Matched Filter Receivers

    Publication Year: 1968, Page(s):749 - 751
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (283 KB)

    In this correspondence, error probabilities are calculated for binary DPSK communication through frequency-selective channels with predetection diversity matched filter reception. A method due to Bello and Nelin is used to carry out the calculations. Error probabilities are calculated for three different combinations of signaling pulse shape and channel frequency correlation function. One of these... View full abstract»

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  • [Back cover]

    Publication Year: 1968, Page(s): 0
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    Freely Available from IEEE

Aims & Scope

This Transactions ceased publication in 1971. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope