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IEEE Transactions on Communications

Issue 9 • September 1976

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Displaying Results 1 - 25 of 28
  • [Front cover and table of contents]

    Publication Year: 1976, Page(s): 0
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    Freely Available from IEEE
  • Editorial

    Publication Year: 1976, Page(s): 945
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    Freely Available from IEEE
  • New Convolutional Codes - Part III

    Publication Year: 1976, Page(s):946 - 955
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (754 KB)

    This paper is the last part of a three-part series on threshold decoding new convolutional codes. The first part of this paper concludes the list with new rate 1/2 codes. For these codes a characteristic equation, in terms of the number of correctable errors and code constraint length, is derived by least square approximations. The second part of the paper is concerned with the usefulness of the c... View full abstract»

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  • Syndrome Decoding of Binary Rate-1/2 Convolutional Codes

    Publication Year: 1976, Page(s):977 - 985
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (939 KB)

    The classical Viterbi decoder recursively finds the trellis path (code word) closest to the received data. Given the received data, the syndrome decoder first forms a syndrome instead. Having found the syndrome, that only depends on the channel noise, a recursive algorithm like Viterbi's determines the noise sequence of minimum Hamming weight that can he a possible cause of this syndrome. Given th... View full abstract»

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  • A VHF Implementation of a LINC Amplifier

    Publication Year: 1976, Page(s):1018 - 1022
    Cited by:  Papers (12)  |  Patents (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1252 KB)

    LINC is a technique that uses signal processing to produce Linear amplification of bandpass signals with grossly Nonlinear circuit Components. The important signal processing functions in LINC are forming two constant envelope phase modulated signal components from the bandpass input signal and recombining the amplified components to produce an amplified replica of the input signal. Two- and three... View full abstract»

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  • A Solution to the Bandwidth Compression Problem - Important Points

    Publication Year: 1976, Page(s):1022 - 1023
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (211 KB)

    The basic problem with all previous methods of bandwidth compression has been that the accuracy of the reconstructed waveform has been poorly controlled. By reconstructing the wavefrom from the compressed digital signal before transmission and creating the error waveform, i.e., substracting the reconstructed from the original waveform to produce the error waveform, followed by adding points to be ... View full abstract»

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  • Recoverability of Communication Protocols - Implications of a Theoretical Study

    Publication Year: 1976, Page(s):1036 - 1043
    Cited by:  Papers (246)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (797 KB)

    A study is presented which permits the formal analysis and synthesis of recoverable computer communication protocols. This study is based on a formal representation of processes by a model of computation, the Petri nets (PN's). The PN model is generalized to include a representation of the possible failures, and then, the concept of "recoverability" is formally defined. A set of necessary and suff... View full abstract»

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  • Average- and Median-Based Smoothing Techniques for Improving Digital Speech Quality in the Presence of Transmission Errors

    Publication Year: 1976, Page(s):1043 - 1045
    Cited by:  Papers (52)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    In digital speech communication, transmission errors generally introduce impulsive distortions in the received speech waveform. Smoothing of this waveform results at once in a squelching of the distortion component, and in an undesirable smearing of the speech. However, our experience with practical differential PCM (DPCM) codes (with adaptive quantizers and first-order predictors) has shown that ... View full abstract»

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  • Regeneration of a Binary Signal in a Uniform Transmission Line

    Publication Year: 1976, Page(s):1054 - 1057
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (437 KB)

    A "square" pulse, positive or negative, is sent along a uniform transmission line fromell = 0and is regenerated atell = L, with some probability of error. The pulse is possibly regenerated at an intermediate point. In all the most reliable channels and in several others that we have examined, the best intermediate point for regeneration is the midpoint,ell = L/2, b... View full abstract»

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  • Correction to "Transmission Characteristics of an M-ary Coherent PSK Signal Via a Cascade of N Bandpass Hard Limiters"

    Publication Year: 1976, Page(s): 1072
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    First Page of the Article
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  • Correction to "An Overview of Latin American Telecommunications, Past, Present, and Future"

    Publication Year: 1976, Page(s): 1072
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    First Page of the Article
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  • Techniques for Correcting Transmission Errors in Video Adaptive Delta Modulation Channels

    Publication Year: 1976, Page(s):1064 - 1070
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1192 KB)

    We investigated the effects of channel errors on an adaptive delta modulator used to encode video signals. The investigation revealed that channel errors caused a permanent shift in the dc level of the delta modulator's estimate. Errors in the step size, on the other hand, were transitory and had no noticeable effect on the received pictures. We then presented three error correction schemes to min... View full abstract»

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  • Formulas for Signal Time Delay Through the Ionosphere

    Publication Year: 1976, Page(s):1052 - 1054
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    Using a probabilistic approach, expressions are obtained for the time delay suffered by a signal propagating through the ionosphere at VHF. The analysis indicates that a first-moment effect (due to the average electron density) and a second-moment effect (due to fluctuations in the angles determined by Snell's laws) superpose. The analysis then leads to three expressions for the first-moment effec... View full abstract»

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  • Transmission of Analog Video and Digital Signals Over Analog-Repeatered Coaxial Lines

    Publication Year: 1976, Page(s):1008 - 1017
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    The transmission of digital telephony or data, alone and together with analog video, over analog-repeatered coaxial-cable lines is discussed. Expressions for the total random noise power and the signal-to-noise ratio (SNR) are derived. These expressions include the effects of thermal noise and the intermodulation distortion due to nonlinearity in the analog repeater amplifiers. The dependence of t... View full abstract»

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  • Optimization of Digital Postdetection Filters for PSK Differential Detectors

    Publication Year: 1976, Page(s):963 - 970
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A digital transversal postdetection filter for use in differential PSK demodulation is proposed, and a method for optimizing the weighting coefficients is presented. This low-pass filter is implemented using a finely spaced (relative to the symbol rate) tapped delay line whose tap weights are determined so as to minimize the overall mean-square error at the detector outputs. It is shown that even ... View full abstract»

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  • A General Theory of Intelligible Crosstalk between Frequency-Division Multiplexed Angle-Modulated Carriers

    Publication Year: 1976, Page(s):999 - 1007
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    A new method for calculating intelligible crosstalk between frequency-division multiplexed (FDM) angle-modulated carriers has been developed and is directly applicable to multicarrier operation in communications satellite systems. The analysis is general in scope and accounts for both the nonlinear amplitude and phase characteristics of the amplifying device by the use of a complex Bessel function... View full abstract»

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  • A New Digital Echo Canceler for Two-Wire Full-Duplex Data Transmission

    Publication Year: 1976, Page(s):956 - 962
    Cited by:  Papers (56)  |  Patents (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    A new approach to echo canceling for two-wire fullduplex data transmission is proposed. The canceling signal is directly synthesized from the binary data, using a transversal filter approach, and the usual multiplications are replaced by additions and subtractions, thus allowing efficient operation of a large number of taps as required for the canceling of distant echoes. As a specific application... View full abstract»

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  • Elimination of DC Offset by MMSE Adaptive Equalizers

    Publication Year: 1976, Page(s):1049 - 1052
    Cited by:  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Data communication systems are often beset with the problem of dc offset. The questions addressed and answered in this concise paper are: 1) can minimum mean-squared error (MMSE) equalizers correct dc offset? 2) what are the exact effects of the equalizer on offset, and offset on residual MSE? We conclude that MMSE equalizers can reduce the effects of dc offset but cannot completely eliminate them... View full abstract»

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  • The Effect of Single Bit Errors in Standard Nonlinear PCM Systems

    Publication Year: 1976, Page(s):1062 - 1064
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The effects of independent bit errors are calculated for nonlinear PCM systems. General simplified computer formulas are given for natural binary and binary folded PCM codes. Analytical formulas are produced for μ-quantization, binary folded PCM, and speech-like input signal density functions. View full abstract»

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  • Harmonic Bandpass Distortion of a Chebyshev Nonlinearity

    Publication Year: 1976, Page(s):1057 - 1060
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Harmonic distortion imparted to the sidebands of an amplitude-modulated carrier by a system described by a Chebyshev series is evaluated. Sideband distortion increases with modulation depth but decreases with low carrier level, when even-harmonic contributions disappear. View full abstract»

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  • How Good is Tapped Delay Line Simulation?

    Publication Year: 1976, Page(s):1029 - 1032
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Some calculations are presented for a uniformly spaced time-invariant tapped delay line simulation of a two-path propagation model using white noise and pseudonoise sequences as input signals. The results indicate that, at least for a straightforward approach, signalto-signal-to-interpolation-noise ratios are poorer than generally expected. View full abstract»

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  • Stability of Decision Feedback Inverses

    Publication Year: 1976, Page(s):970 - 977
    Cited by:  Papers (27)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The method of inversion of linear discrete time systems utilizing quantized feedback is examined, and a stability concept is developed. The application in mind is decision feedback equalization (DFE). Sets of necessary conditions and sufficient conditions for stability are derived. A lower bound for the probability of recovery from error, and an upper bound for the mean recovery time are obtained.... View full abstract»

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  • Performance Monitoring of Digital Communication Systems Using Extreme-Value Theory

    Publication Year: 1976, Page(s):1032 - 1036
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Extreme-value theory has been suggested by various investigators as an efficient tool for use in monitoring the performance of digital communication systems. One drawback to such a procedure is that it requires learning periods to estimate certain parameters of the extremal distributions. Clearly, whenever an update of the estimates is needed, transmission of information must temporarily cease sin... View full abstract»

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  • A Fast Karhunen-Loeve Transform for a Class of Random Processes

    Publication Year: 1976, Page(s):1023 - 1029
    Cited by:  Papers (90)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    The Karhunen-Loeve transform for a class of signals is proven to be a set of periodic sine functions and this Karhunen-Loeve series expansion can be obtained via an FFT algorithm. This fast algorithm obtained could be useful in data compression and other mean-square signal processing applications. View full abstract»

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  • A Simple Buffer Control for Variable-Rate Communication Systems

    Publication Year: 1976, Page(s):1045 - 1048
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    Transmission of data with receiver-controlled bit rate is an effective way to reduce the effect of signal-to-noise ratio (SNR) fluctuations, as in a fading channel. All previous publications on this subject ignore the critical topic of buffer size. This concise paper summarizes the results of the first study of the effect of finite buffers on a variable-rate system for fading channels. 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