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IEEE Transactions on Communications

Issue 1 • January 1974

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

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • Optimization of Two-Dimensional Signal Constellations in the Presence of Gaussian Noise

    Publication Year: 1974, Page(s):28 - 38
    Cited by:  Papers (178)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (945 KB)

    A considerable amount of literature exists on the problem of selecting an efficient set ofNdigital signals with in-phase and quadrature components for use in a suppressed carrier data transmission system. However, the signal constellation which minimizes the probability of error in Gaussian noise, under an average power constraint, has not been determined when the number of signals is g... View full abstract»

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  • Communication Systems Design - P. Panter [Book Reviews]

    Publication Year: 1974, Page(s):95 - 96
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1974, Page(s): 0
    Cited by:  Papers (1)
    Request permission for commercial reuse | PDF file iconPDF (181 KB)
    Freely Available from IEEE
  • Quantizing and Sampling Considerations in Digital Phased-Locked Loops

    Publication Year: 1974, Page(s):68 - 72
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Quantization and sampling effects on the digital phasedlocked loop (DPLL) structures obtained for demodulation of anglemodulated signals using extended Kalman filter algorithms are investigated for the high signal-to-noise ratio (SNR) case in this paper. First, the problem of quantization is considered. The validity of the uniform white sequence model for quantizer error in the DPLL is established... View full abstract»

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  • An Economical Hardware Realization of a Digital Linear Predictive Speech Synthesizer

    Publication Year: 1974, Page(s):82 - 88
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    Speech analysis/synthesis algorithms utilizing linear prediction coefficients have certain advantages over those employing formantbased techniques. For example, 4-kHz speech samples may be synthesized using a basic sequence of 10 multiply/adds followed by a single addition of the current sample of the excitation function. Real-time software synthesis of 4-kHz speech is possible (using this techniq... View full abstract»

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  • Transient Mean and Variance of Phase Error of the First-Order Phase-Locked Loop

    Publication Year: 1974, Page(s):78 - 82
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Based on the Fokker-Planck techniques, the time-dependent mean and variance of phase error of the first-order phase-locked loop in the presence of white Gaussian noise have been obtained via stochastic differential equations. The steady-state variance reduced from the transient case is simple in its form and agrees closely with the previous results obtained by different approaches. View full abstract»

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  • A Second-Order All-Digital Phase-Locked Loop

    Publication Year: 1974, Page(s):62 - 68
    Cited by:  Papers (16)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    A simple second-order digital phase-locked loop has been designed to synchronize itself to a square-wave subcarrier. Analysis and experimental performance are given for both acquisition behavior and steady-state phase error performance. In addition, the damping factor and the noise bandwidth are derived analytically. Although all the data are given for the square-wave subcarrier case, the results ... View full abstract»

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  • Feedback Communications in Fading Channels

    Publication Year: 1974, Page(s):93 - 95
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    A modulation scheme for varying the data rate and transmitted power in accordance with received signal strengths in a fading channel is discussed. The system, using ideal feedback, performs better than one using only rate control with the same constraint on bandwidth. View full abstract»

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  • Hybrid Decoding of Bipolar Signals

    Publication Year: 1974, Page(s):88 - 93
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    An analog-digital hybrid decoder which combines amplitude and duration threshold detection and bipolar violation sensing capabilities for decoding bipolar signals is described. The main features of the decoder are: 1) a preamplifier with automatic gain control (AGC), 2) amplitude and duration threshold detectors, 3) a bipolar violation sensor, and 4) a unipolar pulse generator. The decoder is extr... View full abstract»

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  • Spectrum Clipping

    Publication Year: 1974, Page(s):38 - 45
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    A new signal-processing technique, spectrum clipping, has been investigated. The spectrum clipper is a passive two-port nonlinear circuit that employs parametric excitation of vibrational modes in a magnetoelastic crystal. Spectrum clipping can be considered as a means of recovering periodic and nearly periodic signals from noise. signal-to-noise ratio (SNR) improvements of up to 30 dB are predict... View full abstract»

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  • Bit Error Probability for Baseband and Subcarrier Optical Communication Systems

    Publication Year: 1974, Page(s):55 - 62
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    Digital baseband and digital subcarrier noncoherent optical communication systems are considered in this paper. Expressions are developed for the bit error probability of optical subcarrier systems which use a nonliner polarization modulator and either a one-detector or a two-detector receiver, The expressions are evaluated numerically, and the results are used to compare the one- and two-detector... View full abstract»

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  • Exact Dynamics of Automatic Gain Control

    Publication Year: 1974, Page(s):72 - 75
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The exact input-output relationship is derived for a firstorder automatic gain control loop wherein the variable gain is an exponential function of the gain control voltage. The exact solution is compared to the linearized solution, and the condition for valid linearization is given. View full abstract»

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  • An Error-Probability Upper Bound for Coherent Phase-Shift Keying with Peak-Limited Interference

    Publication Year: 1974, Page(s):6 - 16
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1144 KB)

    An upper bound on the probability of error for coherent phase-shift-keyed (CPSK) systems operating in the presence of peaklimited interference is derived. Such a bound is particularly useful in analyzing the effect of co-channel and adjacent channel interference on CPSK systems. The bound is often tight enough to be employed as a system design tool, and is computationally simple to apply. View full abstract»

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  • Quantized Feedback in an Experimental 280-Mb/s Digital Repeater for Coaxial Transmission

    Publication Year: 1974, Page(s):1 - 5
    Cited by:  Papers (24)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    A 280-Mb/s digital coaxial repeater employing two-level transmission with quantized feedback for dc-wander control has been designed and constructed. The linear channel forward path includes a 10-MHz low-frequency cutoff, and the missing low frequencies are supplied by a filtered signal from the repeater output. This approach effectively removes dc wander without use of code restriction, making it... View full abstract»

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  • Direct-Detection Optical Communication Receivers

    Publication Year: 1974, Page(s):17 - 27
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1184 KB)

    A model that is sufficiently general to describe the predominant statistical characteristics of the output of many real optical detectors is formulated. This model is used to study the optimum receiver processing for direct-detection optical communication systems. In particular, the structures of detectors and estimators for randomly filtered doubly stochastic Poisson processes observed in additiv... View full abstract»

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  • Coupling Errors in Ground Vehicle Communication Systems

    Publication Year: 1974, Page(s):45 - 54
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (904 KB)

    Communication systems for high-speed ground vehicles which employ coupled surface waveguides are considered in this paper. We determine communication errors resulting from AM and FM transmission for the coupling configuration of two randomly separated Goubau lines as a function of the various system parameters. Results are given which indicate that filtering of the transmitted and received signals... View full abstract»

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  • Digital Companding Techniques

    Publication Year: 1974, Page(s):75 - 78
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    This paper deals with the requirements for the design of digital companding techniques in either delta or pulse-code modulation. Both delta and pulse-code modulation convert analogue signals into binary signals and in both these systems the dynamic range is normally small. By the use of companding, the dynamic range can be extended. Since both delta and pulse-code modulation are digital methods, t... View full abstract»

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Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas