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IEEE Transactions on Communications

Issue 6 • December 1972

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Displaying Results 1 - 25 of 31
  • [Front cover and table of contents]

    Publication Year: 1972, Page(s): 0
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    Freely Available from IEEE
  • On the Detection of Differentially Encoded Polyphase Signals

    Publication Year: 1972, Page(s):1121 - 1128
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (606 KB)

    Any digital communication system that employs coherent detection requires coherent reference signals for proper operation. This paper is concerned with the transmission and detection of differentially encoded multiple phase-shift-keyed (MPSK) signals and the ambiguity resolution problem that results from suppression of the transmitted carrier. In particular, the paper presents the analysis and per... View full abstract»

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  • Effect of Mutual Coupling on a Mobile-Radio Maximum Ratio Diversity Combiner With a Large Number of Branches

    Publication Year: 1972, Page(s):1188 - 1193
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (505 KB)

    The effect of mutual coupling on a space diversity combined signal from an optimum resistive load network lessens when the antenna spacingdand the number of elementsMincrease. Whendis greater than 0.2λ, the cumulative distribution curves of anM-branch signal with mutual effects included show only a small difference compared to an array with no coupl... View full abstract»

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  • Comments on "Performance of an Experimental Angle-Diversity Troposcatter System"

    Publication Year: 1972, Page(s):1200 - 1201
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (189 KB)

    First Page of the Article
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  • Correction to "Subjective Effects of Channel Transmission Errors on PCM and DPCM Voice Communication Systems"

    Publication Year: 1972, Page(s): 1201
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (93 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1972, Page(s): 0
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    Freely Available from IEEE
  • A Bipolar Signal Waveform Generator

    Publication Year: 1972, Page(s):1198 - 1200
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Bipolar signal waveforms for digital communication are normally accomplished by coding the message sequence first and then pulse shaping the bipolar signal. The coding is relatively simple to mechanize; the pulse shaping may present some difficulty and approximation techniques may have to be used. A hybrid digital-analog mechanization of a bipolar signal waveform generator in which the bipolar enc... View full abstract»

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  • A Tabulation of Hilbert Transforms for Electrical Engineers

    Publication Year: 1972, Page(s):1194 - 1198
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    The Hilbert transform has found application in the analysis of single-sideband signals and angle modulation in communication systems. This extensive tabulation of this transform should prove handy for engineers as much as the more popular Laplace transform tabulations. Such a comprehensive listing of Hilbert transforms is not available in any published work so far. View full abstract»

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  • A Theoretical Analysis of Telephone Dial Pulse Signaling

    Publication Year: 1972, Page(s):1073 - 1079
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    This paper presents a theoretical analysis of the distortion of the dial pulse waveform and its effects on the response characteristics of the pulse-receiving circuit in the telephone office. To derive expressions for the waveform for dial speeds of 10 and 20 pulses per second (pps) Laplace transformation and matrix algebra are applied to the system, represented by two complementary linear lumped-... View full abstract»

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  • Considerations of Nonlinear Effects in Phase-Modulation Systems

    Publication Year: 1972, Page(s):1063 - 1073
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    A class of "optimum" phase modulation (PM) system treated in the past is one wherein a sinusoidal carrier is phase modulated linearly by a Gaussian (baseband) random process and demodulation is performed by a phase-locked loop (PLL). This paper is concerned with PM systems in which the phase modulation is allowed to be nonlinear. In practice, most phase modulators are restricted to finite ranges o... View full abstract»

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  • Analysis of Variance of Traffic Usage Data

    Publication Year: 1972, Page(s):1051 - 1062
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    Procedures are developed and illustrated by application to real usage data of analysis of variance techniques for measuring components of variance in the data due to trend and arbitrary random variability in usage of equipment in a group as a whole. The usage data are obtained by periodic scanning of the equipment group at fixed intervals. Procedures for fitting the Polya distribution to the data ... View full abstract»

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  • Complex Detection: A Waveform Preserving Technique for Single-Sideband Demodulation

    Publication Year: 1972, Page(s):1097 - 1100
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    The full-carrier single-sideband signal is of the minimal phase type with limited phase excursion and contains sufficient information to recover completely the message waveform. A receiving system is described that makes use of both the envelope and the phase information in the signal. Operation is independent of input signal level and requires no wide-band quadrature network. View full abstract»

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  • Phase and Frequency Tracking Accuracy in Direct-Detection Optical-Communication Systems

    Publication Year: 1972, Page(s):1139 - 1142
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    Lower bounds are given on the attainable mean-square performance in causally tracking the phase and frequency of a subcarrier that modulates an optical carrier in a direct-detection opticalcommunication system. View full abstract»

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  • Stability Analysis of a Digital Rate-Locked Loop

    Publication Year: 1972, Page(s):1136 - 1139
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    We analyze the locking properties of a digital rate-locked loop that may be used to synchronize a slave oscillator with a master. Formulating the dynamics of this system by a nonlinear differentialintegral equation, we rigorously prove that in the absence of filtering in the loop the slave oscillator output waveform has periodic zero crossings occurring at exactly the same rate as those of the mas... View full abstract»

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  • Efficient Synchronization for Digital TV Phone Transmission

    Publication Year: 1972, Page(s):1158 - 1159
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    We describe a technique for jointly encoding the rasterscan sync and data framing information for digital TV phone systems in which synchronous sampling is employed for picture encoding. The technique yields: 1) fast acquisition and hard locking synchronization; 2) highly stable picture displays; and 3) reduced channel capacity requirements. View full abstract»

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  • Signal Relay Systems Using Large Space Arrays

    Publication Year: 1972, Page(s):1108 - 1121
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1576 KB)

    The results of an investigation of the feasibility of using passive space arrays as highly efficient signal reflectors is reported. The design selected as having the maximum efficiency in terms of the ratio of the signal energy reflected in the required direction to the weight of the space array is a gravity gradient stabilized planar array of dipoles connected and supported by lightweight dielect... View full abstract»

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  • The Performance of a Noncoherent FSK Receiver Preceded by a Bandpass Limiter

    Publication Year: 1972, Page(s):1128 - 1136
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Many applications of the bandpass limiter involve either coherent or noncoherent demodulation following the limiter. In this paper we study the performance of a noncoherent frequency-shift keying (FSK) receiver when it is preceded by a bandpass limiter. In particular, we obtain expressions for signal suppression- factor, output signal-to-noise ratio (SNR), and error probability from which one can ... View full abstract»

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  • Signal Detection in the Presence of Cochannel Interference and Noise

    Publication Year: 1972, Page(s):1153 - 1158
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The problem of detection of a sinusoidal signal in the presence of white Gaussian noise and an interfering sinusoid at a nearby frequency is discussed. In the case of coherent detection, several possible receivers are analyzed and probability of error curves are calculated. In some cases it is possible to reduce the effect of cochannel interference significantly by proper choice of a receiver. In ... View full abstract»

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  • Theory of Operation and Design of an All-Digital FM Discriminator

    Publication Year: 1972, Page(s):1159 - 1165
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The theory of operation and the design of an all-digital FM discriminator is presented in this paper. It is shown that the digital discriminator is equivalent to the Foster-Seely demodulator, i.e., a discriminator that converts the FM signal into an AM signal and then recovers the AM by using envelope detection. The output signal-to-noise ratio is found analytically above and below threshold and t... View full abstract»

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  • Statistical Behavior of Deep Fades of Diversity Signals

    Publication Year: 1972, Page(s):1100 - 1107
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    This paper presents the results of a statistical analysis of diversity combining systems. Previous theoretical work on this topic often assumes that the input signals are jointly Rayleigh distributed, which may not hold for a practical fading environment. In this paper, we use a new formulation and analysis to show that the major results of previous theoretical work are actually valid without the ... View full abstract»

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  • An Adaptive Electronic Hybrid Transformer

    Publication Year: 1972, Page(s):1184 - 1188
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A hybrid transformer is used to couple simultaneously both a transmitter and a receiver to the same end of a telephone line with minimum crosstalk. Under ideal circumstances the transformer provides a cancellation signal at the input terminals of the receiver to exactly cancel the signal induced by the local transmitter. This paper describes a simple electronic device that closely behaves as a hyb... View full abstract»

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  • A Digital Echo Suppressor for Satellite Circuits

    Publication Year: 1972, Page(s):1176 - 1181
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    An echo suppressor that is composed solely of digital logic circuits and based on a digital voice detector [1] has been designed. The unit is simple and requires no adjustment. Its basic application is to the SPADE [2] PCM channel, although it can be adapted to work with other systems. Results of initial subjective tests are included. View full abstract»

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  • A Double-Loop Tracking System

    Publication Year: 1972, Page(s):1142 - 1150
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    A nonlinear analysis which can be used to assess certain statistical characteristics of double-loop tracking systems is presented. It takes into account the mutual coupling effects of the loops in the system. Two approaches are taken to obtain steady-state probability density functions (pdf's) of the system phase errors, φ1and φ2From these pdf's, important system pe... View full abstract»

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  • Amplitude- and Time-Limited Functions With Minimum Out-of-Band Energy

    Publication Year: 1972, Page(s):1150 - 1153
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The theory of time-limited functions with minimum out-of-band energy is extended to apply to functions whose amplitude is held constant and hence, are limited to phase modulation. In the absence of the amplitude constraint, the desired functions are prolate spheroidal functions of time, of order zero, with time-bandwidth product as a parameter. With the amplitude constraint, the desired functions ... View full abstract»

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  • On Bandwidth Requirements for Multilevel PCM Encoders

    Publication Year: 1972, Page(s):1165 - 1169
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Most receivers for multilevel pulse-code modulation (PCM) signals incorporate a sample-and-hold circuit in the analog-analog-to-digital converter. The sample-and-hold circuits cannot respond instantaneously in practice, and this paper considers the effects on system performance of their finite response time. To provide guidelines for system designers, the problem is analyzed in some generality and... 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