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IEEE Transactions on Communication Technology

Issue 4 • Date August 1971

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Displaying Results 1 - 25 of 35
  • [Front cover and table of contents]

    Publication Year: 1971, Page(s): 0
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    Freely Available from IEEE
  • Dynamic Behavior of a System of Mutually Synchronized Oscillators

    Publication Year: 1971, Page(s):373 - 395
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2950 KB)

    An analysis is presented of the performance of a synchronous digital communications system in which the clock rate of each station is established as the average of the clock rates of all incoming signals to each station. In a previous paper the steady-state frequencies and phase relationships between stations were analyzed. Here the dynamic response of various frequency-averaging system configurat... View full abstract»

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  • On the use of Channel Introduced Redundancy for Error Correction

    Publication Year: 1971, Page(s):396 - 402
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (535 KB)

    The problem considered is that of reducing intersymbol interference caused by time dispersive channels. Similarity between the response of a time dispersive channel and that of a cyclic algebraic encoder has led to a method of treating the dispersive channel as a linear encoder. A tapped delay line equalizer is used to complete the encoding process so that the result can be decoded and errors corr... View full abstract»

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  • Evaluation of Diver Communication Systems by a Diver-to-Diver Technique

    Publication Year: 1971, Page(s):403 - 409
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (867 KB)

    This investigation was conducted as part of a program of research designed 1) to develop several methodologies for the evaluation of diver communication systems and 2) to carry out these evaluations on available units. The major focus of this report is on a diver-to-diver procedure and data resulting from the evaluation of seven diver communication systems, viz: a) hard-lineAquaphone; b) acoustic-... View full abstract»

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  • Optimal Power Transfer Through Atmospheric Turbulence Using State Knowledge

    Publication Year: 1971, Page(s):410 - 414
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (495 KB)

    The design of a laser transmitter that achieves maximum power transfer through the earth's turbulent atmosphere is considered. It is shown that optimum power transfer would be realized with an adaptive system that uses the appropriate beacon signal to probe the channel state. This result is applied to show that the average power gain of the optimal earth-to-space optical link is the diffraction-li... View full abstract»

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  • An Empirical Comparison of Two Sequential Decoding Algorithms

    Publication Year: 1971, Page(s):415 - 419
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (429 KB)

    The results of comparison of the conventional Fano algorithm and a new stack algorithm proposed by Zigangirov and Jelinek, by computer simulation of two sequential decoding algorithms are reported. The results indicate that for rates near Rcompthe stack algorithm offers a considerable improvement in decoder speed over the Fano algorithm, provided that fairly large storage capacity is av... View full abstract»

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  • Multiple Error Performance of PSK Systems with Cochannel Interference and Noise

    Publication Year: 1971, Page(s):420 - 430
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    The multiple error performance of a phase-shift-keyed (PSK) communications system, when both cochannel interference (due possibly to other cochannel angle-modulated systems) and Gaussian noise additively perturb the transmitted signals, is considered. The results are fairly general: the main requirement is that the interference be circularly symmetric. All of our findings are also applicable to th... View full abstract»

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  • Performance Evaluation of a New Modulation Technique

    Publication Year: 1971, Page(s):431 - 445
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1574 KB)

    The performance of a new modulation technique which has been called mixed-base modulation (MBM) is presented. This technique provides significant performance advantages over other common modulation techniques for applications where both power and bandwidth are limited. Its performance for bandspreading factors of two relative to single-sideband is within 4 dB of the ultimate Shannon bounds. Most a... View full abstract»

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  • Signal Design and Error Rate of an Impulse Noise Channel

    Publication Year: 1971, Page(s):446 - 458
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1033 KB)

    An optimal signal design of the classical smeardesmear technique for combating impulse noise is demonstrated. The signal design makes use of calculus of variations to derive an integral equation to which several solutions are given, along with a technique for generating additional solutions. A computer simulation and an evaluation of Rice's triple integral pdf for impulse noise are used to analyze... View full abstract»

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  • The Spectra of Digitally Encoded Video Signals

    Publication Year: 1971, Page(s):459 - 466
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (723 KB)

    Because of the nonlinear nature of quantizing and coding operations, it is not possible, in general, to derive the power spectrum for a digitally encoded signal from a knowledge of only the spectrum of the original analog signal. For video signals, however, the analog process can be modeled by the random step function. This leads to a convenient expression for the power spectral density of the dig... View full abstract»

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  • On Decoding of Correlative Level Coding Systems with Ambiguity Zone Detection

    Publication Year: 1971, Page(s):467 - 477
    Cited by:  Papers (21)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1022 KB)

    Decoding of a correlative level coding or partialresponse signaling system is discussed in an algebraic framework. A correction scheme in which the quantizer Output includes ambiguity levels is proposed. The implementation and algorithm of error correction is discussed in some detail. An optimum design of the quantizer based on Chow's earlier work is discussed. Both analytical and simulation resul... View full abstract»

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  • Distortion Analysis of Binary FSK

    Publication Year: 1971, Page(s):478 - 486
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    The performance of the binary frequency-shift keying (FSK) data system employing a conventional limiterdiscriminator detector is analyzed. Both additive noise and distortion produced by the transmitter and receiver bandpass filters are taken into account. Performance tradeoffs with respect to transmitter frequency deviation, bandpass filter shape, and bandpass filter bandwidth are investigated. In... View full abstract»

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  • Statistical Bit Synchronization in Digital Communications

    Publication Year: 1971, Page(s):487 - 491
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    A Kalman filtering algorithm has been applied to the problem of bit synchronization in an M -ary communication system. No synchronizing signal is assumed present; the approach is arranged to determine timing information from the transitions occurring in a pseudorandom sequence of symbols, generated with a fixed but initially unknown bit rate. Procedural steps s... View full abstract»

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  • The Effect of Gaussian Error in Maximal Ratio Combiners

    Publication Year: 1971, Page(s):492 - 500
    Cited by:  Papers (148)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (658 KB)

    In a fading channel, maximal ratio diversity combilling improves the average signal-to-noise ratio over thatof a single branch in proportion to the number of diversity branches combined. However, its main advantage is the reduction of the probability of deep fades. The effect of Gaussian errors in the combiner weighting factors on the probability distribution of the output signal-to-noise ratio is... View full abstract»

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  • Computer-Aided Analysis and Design of Negative Impedance Boosted Transmission Lines

    Publication Year: 1971, Page(s):501 - 516
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1246 KB)

    Negative impedance boosting using active RC circuits series connected at intervals along a cable pair has been shown to minimize loss and provide nearly distortionless bilateral transmission of either digital or analog signals. Results from computation and field measurements are in good agreement. Recently, on-line plotting with a time-shared computer has made... View full abstract»

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  • Surface Transfer Impedance of Cable Shields Having a Longitudinal Seam

    Publication Year: 1971, Page(s):517 - 522
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (573 KB)

    The magnitude of noise induced into communication cable from electromagnetic influences is reduced by the shielding properties of the metallic shield. One of these properties is the surface transfer impedance. The surface transfer impedance relates the current induced on one side of a shield to the longitudinal voltage appearing on the other side due to that current. At low frequencies the surface... View full abstract»

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  • Subscriber Loop Multiplexer - A High Pair Gain System for Upgrading and Growth in Rural Areas

    Publication Year: 1971, Page(s):523 - 527
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (507 KB)

    The subscriber loop multiplexer is a combined carrier and switching system for serving 80 main stations on 24 channels. The system has been designed for use in rural areas to handle growth and upgrading from multiparty service toward individual service. The system consists of a control terminal and up to six remote terminals located near the customers being served. The system is digital and uses a... View full abstract»

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  • A New Store and Forward Message Switching System

    Publication Year: 1971, Page(s):528 - 529
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (258 KB)

    A store and forward message switching system, made up of duplexed 16-bit computers, fixed head discs (FHDs), moving head discs (MHDs), and multiline controllers (MLCs) is described. The paper discusses the area of application for a system of this type, and the equipment configuration and operation of the subject system. The paper concludes with a discussion of the redundancyswitchover aspects of t... View full abstract»

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  • A Method for Computer Control Transfer in a Communication Switching System

    Publication Year: 1971, Page(s):529 - 532
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (315 KB)

    A method is outlined for maintaining digital processor control of a switching system in the event of a processor failure. The solution chosen uses a minimum of equipment consistent with high system availability. Transfer mechanisms, logic, and required software processing are discussed. View full abstract»

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  • Optimum Prefiltering and Postfiltering of Sampled Waveforms

    Publication Year: 1971, Page(s):532 - 535
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    Communication systems that transmit samples from analog waveforms are considered. Optimum pre- and postfilters of these samples are derived. The criterion of optimality is minimization of the mean-square error in reproducing the waveforms subject to a constraint on the signal-to-noise ratio per transmitted sample. The results of this filtering are evaluated and compared to other filtering schemes. View full abstract»

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  • A Derivation of the Spectra of N-Ary Orthogonal Comtinuous-Phase FSK Waveforms for ELF/VLF Communications

    Publication Year: 1971, Page(s):536 - 539
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (361 KB)

    The power spectral density of continuous-phase minimum-bandwidth waveforms composed from a set of N mutuallyorthogonal chips (pulsed sinusoids of equal amplitude and duration and constant frequency) is derived. The spectrum and its derivation for this class of signals are of particular interest in highpower extremely low frequency/very low frequency (ELF/VLF) c... View full abstract»

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  • Distribution of Click Amplitudes

    Publication Year: 1971, Page(s):539 - 543
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    The amplitude of a click is defined as the output of an ideal FM demodulator at the time of occurrence of the click. It is shown that the amplitude of a click (when the carrier is unmodulated) is a function of two random variables whose join distribution function is derived under the condition that a positive click has occurred. The distribution of positive click amplitudes is derived with the car... View full abstract»

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  • Implementation of Reed-Solomon Erasure-Correcting Decoder for Hybrid Coding Scheme

    Publication Year: 1971, Page(s):543 - 546
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (379 KB)

    Implementation of the algebraic section of a relatively simple sequential-algebraic error-correcting scheme for very noisy channels is detailed, and its complexity evaluated. Since one of the properties of this hybrid is that the sequential portion can be any standard sequential decoder, the description here is sufficient to specify the modifications which must be performed on a convolutional-enco... View full abstract»

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  • Adaptive Delta Modulator for Telephony and Its Application to the Adaptifon System - An Alternative Implementation of the Lincompex Concept

    Publication Year: 1971, Page(s):547 - 551
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (435 KB)

    An adaptive version of the basic delta modulator employing full-width pulses and RC integration is described. A digital technique is used to sense the slope of the input signal and to control the amplitude of the pulses supplied to the RC network in the feedback loop. Subjective testing with speech signals and a modulator ... View full abstract»

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  • Storage and Delay Estimates for Asynchronous Multiplexing of Data in Speech

    Publication Year: 1971, Page(s):551 - 555
    Cited by:  Papers (17)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    The communication system considered here interpolates data in the pauses in speech. Speech is gated on and off by comparing its own envelope to a threshold. At the same time a source is generating data at a fixed rate. The data are stored in a buffer, awaiting transmission during one of the gaps in speech. This paper presents a theoretical analysis of a model in which successive speech durations a... View full abstract»

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Aims & Scope

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

Full Aims & Scope