IEEE Transactions on Communications

Issue 2 • April 1972

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Displaying Results 1 - 25 of 36
  • [Front cover and table of contents]

    Publication Year: 1972, Page(s): 0
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  • An Analytical Methodology for Solving Complex Stochastic Network Problems

    Publication Year: 1972, Page(s):81 - 87
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (705 KB)

    An analytical methodology (GERT) using the linear signal flowgraph topology is recommended for solution of problems related to complex stochastic networks, as a convenient alternative to commonly used Monte Carlo simulation technique. The novelty of this paper is in the use Laplace transforms in defining thewfunction associated with each branch of the network, which permits solution of ... View full abstract»

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  • Compression of Transmission Bandwidth Requirements for a Certain Class of Band-Limited Functions

    Publication Year: 1972, Page(s):104 - 114
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1038 KB)

    A study of source-encoding techniques that afford a reduction of data-transmission rates is made with particular emphasis on the compression of transmission bandwidth requirements of band-limited functions. The feasibility of bandwidth compression through analog signal rooting is investigated. It is found that theNth roots of elements of a certain class of entire functions of exponentia... View full abstract»

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  • A Simple Method of Calculating the Characteristics of FSK Signals With Modulation Index 0.5

    Publication Year: 1972, Page(s):139 - 147
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (774 KB)

    Frequency-shift-keying (FSK) signals with modulation indexm = 0.5have two significant properties. They have no discrete frequency components and nearly all the signal energy is contained within a narrow frequency region equal tofrac{3}{2}of the bit speed even without any band limiting. Unfortunately, a complete mathematical description of FSK signals in general is difficult, ... View full abstract»

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  • Spectral Energy Distribution of Radio Link FM

    Publication Year: 1972, Page(s):165 - 173
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (849 KB)

    The series expansion for the energy distribution of quasi-niose-modulated and arbitrarily preemphasized FM signals is being derived. Computer evaluations for the CCIR multichannel preemphasis in the range applicable to systems between 12- and 1800-channel loading show that not the total phase deviation but the deviation ηtopof the upper baseband portion is the quantity governing th... View full abstract»

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  • Calculating Method for Call Congestion of Gradings for Random Routing Whose Traffic has a Poisson Distribution

    Publication Year: 1972, Page(s):204 - 210
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (661 KB)

    First Page of the Article
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  • Geostationary Satellite Orbital Geometry

    Publication Year: 1972, Page(s): 252
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    In the design of communication systems using geostationary satellites, it is essential to know the relationships among the slant range, elevation angle, central angle, and nadir angle. View full abstract»

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  • Correction to "The Effect of Gaussian Error in Maximal Ratio Combiners"

    Publication Year: 1972, Page(s): 258
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (138 KB)

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  • Correction to "A Communications Detector With a Signal-Synthesized Reference"

    Publication Year: 1972, Page(s): 262
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (109 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
  • Threshold-Extended FM Demodulator for Black and White Video Signal

    Publication Year: 1972, Page(s):235 - 242
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (840 KB)

    In frequency demodulation threshold noise appears in the form of pulses of various amplitude and width. When a TV signal is transmitted these pulses can be detected at the outputs of a line-by-line subtractor, since their amplitude is in general much greater than the amplitude of the noise and of the residual video signal. Based on this principle a threshold noise suppressor (TNS) has been applied... View full abstract»

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  • Pacific Intertie Tests

    Publication Year: 1972, Page(s):202 - 204
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (368 KB)

    The Pacific Intertie has the world's longest highvoltage direct current (HVDC) transmission line. Its presence in proximity to communications circuits poses a potential interference problem with respect to electrostatic and electromagnetic induction and a possible electrolysis problem with respect to underground metallic structures located near the line's earth electrodes. This paper traces the hi... View full abstract»

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  • Choice of Prefix in Self-Synchronizing Codes

    Publication Year: 1972, Page(s):253 - 254
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (192 KB)

    In this correspondence a special prefix code with stuffing bits is described and the sequences that are more suitable as prefixes, called valid sequences, are determined by means of a condition they must satisfy. The best prefix length as a function of the total number of bits in the code is then evaluated. View full abstract»

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  • Hard-Limiter Intermodulation Product Magnitudes for Three Signals in Random Noise

    Publication Year: 1972, Page(s):258 - 260
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (304 KB)

    When two or more sinusoidal signals are passed through a hard limiter, intermodulation (IM) products are developed at the limiter output. The magnitudes of the IM products are a function of the relative levels of the input signals, as well as the input noise, if present. This paper considers the case of three input sinusoids plus random noise. Quantitative values for IM-product magnitudes are pres... View full abstract»

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  • Buffer Behavior for Mixed Input Traffic and Single Constant Output Rate

    Publication Year: 1972, Page(s):230 - 235
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (424 KB)

    A queueing model with limited waiting room (buffer), mixed input traffic (Poisson and compound Poisson arrivals), and constant service rate is studied. Using average burst length, traffic intensity, and input-traffic mixture rate as parameters, we obtain relationships among buffer size, overflow probabilities, and expected message-queueing delay due to buffering. These relationships are portrayed ... View full abstract»

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  • Hard Limiting of Gaussian Noise Having a First-Order Butterworth Bandpass Spectrum

    Publication Year: 1972, Page(s):255 - 258
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (344 KB)

    This correspondence is concerned with the closedform computation of tight upper and lower bounds to the primary zone spectrum existing at the output of a symmetrical hard limiter driven by stationary zero-mean Gaussian noise whose spectral shape is that of a narrow-band first-order Butterworth bandpass filter. View full abstract»

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  • The A6 Channel Bank

    Publication Year: 1972, Page(s):196 - 201
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (688 KB)

    The A6 channel bank is the latest of a series of Bell System frequency division multiplex terminal equipments used to provide the first step of modulation and the final step of demodulation in carrier telephony. Cost and size reduction are the primary objectives of the development and are realized through the use of monolithic quartz crystal filters and hybrid monolithic silicontantalum thin film ... View full abstract»

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  • Understanding Impulse-Noise Measurements

    Publication Year: 1972, Page(s):247 - 251
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (512 KB)

    Numerous articles have been written on the general properties of impulse noise, models for it, and its effects on data transmission. Most of these make an attempt to apply or generate some particular theory with respect to the phenomenon. A literature search has given rise to an awareness of the need for a paper devoted solely to the idiosyncrasies of impulse-noise measurements and their interpret... View full abstract»

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  • Note on Phase Locking to the Envelope of a Periodically Pulsed Sine Wire

    Publication Year: 1972, Page(s):254 - 255
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (176 KB)

    A periodically pulsed sine wave in noise, typical in wildlife tracking systems, is often envelope demodulated in the signal detector. An automatic detector using correlation techniques might employ a binary (bang-bang) multiplier in the phase-lock loop to lock onto the demodulated pulse train. A threshold device in front of or incorporated into the multiplier to quantize the pulse envelope causes ... View full abstract»

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  • Convergence of Oscillator Spectral Estimators for Counted-Frequency Measurements

    Publication Year: 1972, Page(s):214 - 217
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (440 KB)

    A common intermediary connecting frequency-noise calibration or testing of an oscillator to useful applications is the spectral density of the frequency-deviating process. In attempting to turn test data into predicts of performance characteristics, one is naturally led to estimation of statistical values by sample-mean and sample-variance techniques. However, sample means and sample variances the... View full abstract»

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  • Autocorrelation and SNR for the Output of a Square-Law Device and Low-Pass Filter With Square-Law SSB Plus Gaussian Noise at the Input

    Publication Year: 1972, Page(s):222 - 225
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (440 KB)

    Powers' square-law single-sideband (SSB) signal is shown to be to ordinary SSB roughly what amplitude modulation (AM) with carrier is to amplitude-modulation suppressed carrier (AMSC) signaling. That is, both SSB and AMSC require coherent demodulation at the receiver to recover the information signal properly and this requires the slaving of the receiver to the transmitter or at least the use of e... View full abstract»

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  • Minimum Mean-Squared-Error Quantization in Speech PCM and DPCM Systems

    Publication Year: 1972, Page(s):225 - 230
    Cited by:  Papers (125)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (496 KB)

    The optimum (minimum mean-squared-error) and optimum uniform quantizing characteristics for Laplacian- and gamma-distributed signals are given in tabular form. The performance of these quantizers in real speech pulse-code modulation (PCM) and differential pulse-code modulation (DPCM) systems is investigated and compared with that obtained when the μ-law quantizing characteristic is used. View full abstract»

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  • On the Selection of an Optimum Design Point for Phase-Coherent Receivers Employing Bandpass Limiters

    Publication Year: 1972, Page(s):210 - 214
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (544 KB)

    In the design of phase-coherent receivers employing bandpass limiters, it is customary to specify system performance relative to its value at a fixed design point. For a given design point, it is well known that an optimum tradeoff can be found between the power allocated to the carrier and sideband signals. This paper describes an attempt to further improve the performance of such coherent carrie... View full abstract»

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  • Distortion in the Frequency Demodulator Using Feedback

    Publication Year: 1972, Page(s):157 - 165
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (656 KB)

    The response of a frequency demodulator using feedback (FMFB) to a frequency modulated signal is analyzed. Canonical equations of operation are obtained. Harmonic distortion is calculated for the case of a sinusoidal modulating signal. Intermodulation distortion is calculated assuming a noise-like modulation. Design curves are presented. The special case of harmonic and intermodulation distortion ... View full abstract»

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  • The Effect of Timing Errors in Optical Digital Systems

    Publication Year: 1972, Page(s):87 - 93
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (672 KB)

    The use of digital transmission with narrow light pulses appears attractive for data communications, but carries with it a stringent requirement on system bit timing. The effects of imperfect timing in direct-detection (noncoherent) optical binary systems are investigated using both pulse-position modulation (PPM) and on-off keying for bit transmission. Particular emphasis is placed on specificati... 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