By Topic

IEEE Transactions on Communications

Issue 3 • Date March 1973

Filter Results

Displaying Results 1 - 23 of 23
  • [Front cover and table of contents]

    Publication Year: 1973, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (165 KB)
    Freely Available from IEEE
  • Radio Transmission to and from Underground Coal Mines - Theory and Measurement

    Publication Year: 1973, Page(s):194 - 202
    Cited by:  Papers (21)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (690 KB)

    Research involved in the development of a radio communication system for use in coal mine disasters is described. Theoretically predicted field strengths for surface to mine and mine to surface propagation are compared with measurements in coal mines in Colorado and Pennsylvania. It is concluded that surface-to-mine voice communication is practical using a horizontal wire antenna operating at audi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Correction to "Effect of Mutual Coupling on a Mobile-Radio Maximum Ratio Diversity Combiner With a Large Number of Branches"

    Publication Year: 1973, Page(s):266 - 267
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (90 KB)

    First Page of the Article
    View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Publication Year: 1973, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (207 KB)
    Freely Available from IEEE
  • Comparison of Some Cost Functions for Automatic Equalization

    Publication Year: 1973, Page(s):233 - 237
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Automatic equalization for digital systems often has as its immediate goal the minimization of some cost function that depends explicitly on the values of intersymbol interference, and thus implicitly on the tap settings. For ease of implementation it is often desirable to slightly modify the conventional distortion measures. A theoretical comparison of several such criteria, some of which are of ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transmission Properties of Filled Thermoplastic Insulated and Jacketed Telephone Cables at Voice and Carrier Frequencies

    Publication Year: 1973, Page(s):203 - 209
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    Interest is increasing in thermoplastic insulated and jacketed cables that are filled to minimize the entry and flow of water within the core. Such cable designs provide reliable, stable transmission characteristics, particularly for the increasingly popular pulse-code modulation (PCM) systems. This paper explores the primary and secondary electrical parameters of filled telephone cables in the vo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Intermodulation Distortion of FDM-FM in Injection-Locked Oscillator

    Publication Year: 1973, Page(s):191 - 194
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    When an injection-locked oscillator is used to amplify a frequency division multiplexing-frequency modulation FDM-FM signal, second- and third-order distortions are found to exist. Explicit expressions are derived that give the signal-to-distortion ratio (NPR) as a function of the locking bandwidth, frequency offset, and various modulation parameters. These formulas are believed to be valid within... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Note on the Error Signal of Block Quantizers

    Publication Year: 1973, Page(s):216 - 219
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    We show that the error signal incurred by block quantizing stationary data is nonstationary under some conditions. Examples are presented that indicate that the mean square error is largest at the block edges. When block quantizers are used to encode pictures at low bit rates, this effect tends to make the block edges visible in the reconstructed picture. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Intraframe Image Coding by Cascaded Hadamard Transforms

    Publication Year: 1973, Page(s):175 - 180
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    Various image coding schemes have been studied for digital transmission of videophone signals. The Hadamard transform, which is now studied for the transmission of pictures such as those from satellites, has been considered too complicated for public use, though the characteristics such as the ratio of bit-rate reduction are more desirable than those of differential pulse-code modulation (DPCM). W... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Error Probability in the Presence of Intersymbol Interference and Additive Noise for Multilevel Digital Signals

    Publication Year: 1973, Page(s):181 - 190
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    A new method is presented to compute the average probability of error in the presence of intersymbol interference and additive noise for multilevel pulse-amplitude-modulation (PAM) and partial-response-coded (PRC) signaling schemes. The method is based upon nonclassical Gauss quadrature rules (GQR) and suffers no limitation on noise statistics, so that it applies also for non-Gaussian noise. Moreo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Simple Analytical Model for the Envelope Distribution of a Sinusoidal Carrier in Atmospheric Radio Noise

    Publication Year: 1973, Page(s):254 - 255
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    A recent article by Omura and Shaft [1] proposed modeling atmospheric radio noise as a narrow-band process having a lognormal envelope distribution. Based on such a model, an approximate expression is derived for the envelope probability distribution of a sinusoidal carrier in atmospheric radio noise. The results are compared with measured distribution of the instantaneous amplitude out of a wide-... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A New Digital Coherent Demodulator

    Publication Year: 1973, Page(s):237 - 238
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A coherent demodulator is described which is particularly well suited to digital implementation. Its important features are that no low-pass filter is required to eliminate double-frequency terms and that the passband signal need be sampled at only twice the highest frequency of the baseband signal, rather than at twice the highest frequency of the passband signal. A demodulator of this type will ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Intersymbol Interference in Binary Communication Systems with Single-Pole Band-Limiting Filters

    Publication Year: 1973, Page(s):238 - 243
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    The exact value of the probability of error is computed for binary communication systems with sampling detector or integrating-and-dumping detector, with nonreturn-to-zero or split-phase signals and single-pole filters in the receiver and transmitter. The effect of nonoptimal sampling time on the probability of error is presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Digital Single-Sideband Modulation

    Publication Year: 1973, Page(s):255 - 262
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    This paper considers digitized Weaver modulators for single-sideband modulation that can be used in radio communications and telemetering. A system of 12 such modulators to process 12 analog signals digitally is replaced by six multiplex modulators at the cost of additional computation at the input but with an overall reduction in computation time and a higher degree of accuracy. A unique digital ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Upper Bound for Error-Pattern Probabilities for Digital Transmission by PAM

    Publication Year: 1973, Page(s):230 - 233
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    This paper presents an upper bound on error-pattern probabilities for digital pulse-amplitude modulation transmission in a bandrestricted and additive white noise environment. The bound involves the computation of exponential and hyperbolic cosine functions. For two examples from the literature it yields a result that is an improvement on previously known results. For the case of double errors it ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Linear Bit Synchronizer with Learning

    Publication Year: 1973, Page(s):226 - 230
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    An adaptive sequential bit synchronizer for a random squarewave data process is proposed in this paper. The probability distributions of the signal parameters and noise process are assumed unknown. The synchronization algorithms, implemented on a small computer, are capable of accurately estimating pulse transition time, pulse amplitude, and pulsewidth simultaneously by invoking the Gauss-Markov t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Adaptive Delta Modulator with Overshoot Suppression for Video Signals

    Publication Year: 1973, Page(s):243 - 247
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    An adaptive delta modulator for television signals has been implemented in which the step magnitude depends on the four most recent sign bits. Overshoot limits the largest step size that can be used: to overcome this limitation an overshoot suppression scheme has been devised, considerably improving picture quality. An adaptive 2-bit differential pulse-code modulation (DPCM) system is also describ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Effect of Carrier Phase and Timing on a Single-Sideband Data Signal

    Publication Year: 1973, Page(s):262 - 264
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Considering the recovery of carrier phase and timing for optimum detection of a single-sideband data signal, a relation is derived for simultaneous optimum setting of these parameters. To find the optimum settings, it is shown that the mean-square error (MSE) of the demodulated signal, defined as the sum of the squared deviations of the received signal from the nearest possible level of an undisto... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the Application of Haar Functions

    Publication Year: 1973, Page(s):209 - 216
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    Recent interest in the application of Walsh functions suggests that Haar functions, close relatives of Walsh functions, may also be useful. In this primarily tutorial paper, Haar functions are reviewed briefly and the computational and memory requirements of the Haar transform are analyzed; applications are then discussed. It is concluded that, whereas Haar functions are unlikely to be useful in a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Queuing Problem for an Intermittent Data Transmission System

    Publication Year: 1973, Page(s):247 - 253
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A mathematical model based on queuing theory is described. This model assists the choice of buffer size necessary for an intermittent digital transmission system. The influence of any type of interruption on the data transmission can be evaluated. Comparison among different message transmission formats can be carried out in order to choose the one that best corresponds to the overall requirements. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Coupled Decoding of Block-Convolutional Concatenated Codes

    Publication Year: 1973, Page(s):219 - 226
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    Straightforward implementation of a maximum likelihood decoder implies a complexity that grows algebraically with the inverse of error probability. Forney has suggested an approach, concatenation, for which error probability decreases exponentially with increasing complexity. This paper presents the results of an evaluation of a particular concatenation system, structurally similar to the hybrid s... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Joint Optimization of Receive Filter and Equalizer

    Publication Year: 1973, Page(s):264 - 266
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    It is shown that a suitable adaptive receiver for digital communication over noisy dispersive unknown channels consists of an adaptive prefilter followed by an adaptive equalizer. The adaptive receiver is optimized by a minimization of the overall receiver mean-square error. The resultant adaptive receiver requires a dummy equalizer to supply a control signal for adjusting the tap gains of the pre... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Combined Coding and Modulation Approach for Communication over Dispersive Channels

    Publication Year: 1973, Page(s):159 - 174
    Cited by:  Papers (40)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1408 KB)

    The concept of combining the design of the error-correcting-coding approach and the modulation format is treated in general terms and its effectiveness is demonstrated by a specific implementation referred to as Codem I. A new decoding algorithm is presented, which has the interesting property that the only channel measurement information utilized is the relative reliability of each received digit... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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