IEEE Transactions on Communications

Volume 25 Issue 5 • May 1977

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Displaying Results 1 - 19 of 19
  • [Front cover and table of contents]

    Publication Year: 1977, Page(s): 0
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    Freely Available from IEEE
  • Intraframe Sequential Picture Coding

    Publication Year: 1977, Page(s):485 - 495
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (914 KB)

    This paper generalizes time-discrete autoregressive source coding results of rate-distortion theory to two dimensions. A 2-D discrete autoregressive source is defined and shown to produce a 2-D widesense Markovian field. The rate distortion function of the source is then obtained under assumption of Gaussian field statistics and a squared error fidelity criterion. A procedure for generating an ens... View full abstract»

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  • Transmitting 4-MHz TV Signals by Combinational Difference Coding

    Publication Year: 1977, Page(s):508 - 516
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (885 KB)

    An interframe coding system is described which is capable of transmitting both 4-MHz videotelephone signals and NTSC color TV signals at an average rate of 6.312 Mbits/s. The coding system takes as much advantage as possible of in-frame correlation, in addition to interframe correlation, by coding pel-to-pel difference of interframe difference (combinational difference). Variable-length word codin... View full abstract»

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  • Spectra of PSK Signals with Overlapping Baseband Pulses

    Publication Year: 1977, Page(s):523 - 530
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (491 KB)

    This paper derives a new power spectrum formula for constant-envelope PSK signals. The only signal constraints are that the baseband pulses be of finite duration and the pulse amplitudes be mutually independent. The computer program used to implement the formula is made highly efficient by the use of fast Fourier transform (FFT) algorithms. The key contribution of the new result is the high degree... View full abstract»

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  • Truncation Error Probability in Viterbi Decoding

    Publication Year: 1977, Page(s):530 - 532
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (325 KB)

    An upper bound on the bit error probability due to truncation of the path length in Viterbi decoding is obtained for any given convolutional code. This bound is then used to determine the path length at which the additional error probability due to truncation becomes negligible compared to the maximum likelihood decoding error probability. These results are tested by simulation using several short... View full abstract»

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  • Error Rate Bounds for Digital PAM Transmission with Phase Jitter and Intersymbol or Cochannel Interference

    Publication Year: 1977, Page(s):536 - 541
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (641 KB)

    A simple method is presented for computing upper and lower bounds for binary PAM signaling over channels with phase jitter. Other impairments to reliable communication are taken to be additive thermal noise and intersymbol or cochannel interference. The important cases of binary and quadrature phase shift keying are cases for which the analysis presented is valid. The method consists of finding up... View full abstract»

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  • Error Probabilities for Orthogonal Multiplex Systems in the Presence of Intersymbol Interference and Gaussian Noise

    Publication Year: 1977, Page(s):549 - 557
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (662 KB)

    The transmission model for anN-dimensional system is extended to handle additive noise and timing error. An orthogonal multiplex system operating in the presence of additive noise and channel introduced inter- and intra-symbol interference is analyzed. Error probabilities are derived and results are reported for carder sets comprising trigonometric product waveforms, Walsh functions, pa... View full abstract»

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  • Adaptive Delta Modulation for Companded PCM Coding and Decoding

    Publication Year: 1977, Page(s):557 - 561
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (538 KB)

    An adaptive delta modulator and demodulator are used as the first and last stages in a system for coding and decoding telephone signals into μ = 255 companded pulse code modulation (PCM). The system objectives are to devise an economic coder and decoder that is reliable, free of potentiometer adjustments, and convenient for automated manufacturing for large quantity production. The strateg... View full abstract»

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  • Performance of Biphase Digital FM Transmission

    Publication Year: 1977, Page(s): 564
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (109 KB)

    The observation by several investigators that the spectrum of a digital FM signal is concentrated near the carrier frequency for small frequency deviation ratios (h) led Tjhung and Wittke [1] to investigate the probability of error to determine the optimum bandwidth-bit period (BT) product and optimumh. Their results using discriminator demodulation showed that for... View full abstract»

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  • [Back cover]

    Publication Year: 1977, Page(s): 0
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    Freely Available from IEEE
  • A Linear Algorithm for the Merli Scan

    Publication Year: 1977, Page(s):564 - 567
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A linear algorithm for the merli scan is described which exhibits a better quantization SNR than a nonlinear algorithm proposed by Limb and is more easily implemented. The error propagation characteristics for the linear algorithm are similar to those for the Limb algorithm. View full abstract»

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  • Experimental Fiber-Optic Transmission System for Interoffice Trunks

    Publication Year: 1977, Page(s):517 - 523
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    This paper discusses in a general way the design of, and realization of, an experimental transmission system using optical fibers. Aimed at interoffice trunk applications in metropolitan areas, the design demonstrates the performance expected for a practical system. Included in the experimental system is a translation from standard digital hierarchy signal formats to a format more suitable for sim... View full abstract»

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  • A Detailed Comparison of Four Approaches to the Calculation of the Sensitivity of Optical Fiber System Receivers

    Publication Year: 1977, Page(s):541 - 548
    Cited by:  Papers (81)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    In this paper four approaches to the calculation of error rates for optical fiber system repeaters are compared ("Exact" calculation, Monte Carlo simulation, Chernoff bounds and the Gaussian approximation). We conclude that the "Exact" and Monte Carlo calculations are in complete agreement. This allows the Monte Carlo results to be used to calibrate other methods. The relatively simple Chernoff bo... View full abstract»

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  • Improved Sequential Signaling and Decision Techniques for Nonbinary Block Codes

    Publication Year: 1977, Page(s):561 - 563
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A situation is postulated whereby the goal is to maximize the average number of bits per second reliably communicated by nonbinary block codes over a channel whose conditions are slowly varying in a largely unpredictable fashion. A feedback channel limited to block retransmission requests is assumed. It is demonstrated that repetition usually is not the best signaling technique for sequential deci... View full abstract»

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  • A Three-Level Adaptive Delta Modulator

    Publication Year: 1977, Page(s):532 - 536
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    A three-level adaptive delta modulator for image encoding is presented. Its advantage is better tracking of signal levels. The characteristic constants of this modulator are designed to satisfy certain convergence and error properties. Behavioral curves of the modulator for different choices of the characteristic constants are included as well as the reconstructed versions of pictures that were en... View full abstract»

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  • Optimum Quantization for Signal Detection

    Publication Year: 1977, Page(s):479 - 484
    Cited by:  Papers (104)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    Optimum quantization of data, primarily for signal detection applications, is considered. It is shown that two useful detection criteria lead to quantization which gives the minimum mean-squared error between the quantized output and the locally optimum nonlinear transform for each data sample. This criterion is an extension of the usual minimum distortion criterion for optimum quantizers. Numeric... View full abstract»

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  • Interpolative Picture Coding Using a Subjective Criterion

    Publication Year: 1977, Page(s):503 - 508
    Cited by:  Papers (6)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    Interpolative picture coding refers to sending coded information about a few picture elements separated in space and interpolating all the rest of the picture elements. In this paper we consider sending coded information about picture elements separated by as large a distance as possible along a scan line. We study the effects of a few twodimensional interpolation strategies and evaluate the usefu... View full abstract»

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  • Retransmission Error Control with Memory

    Publication Year: 1977, Page(s):473 - 479
    Cited by:  Papers (100)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    Automatic-repeat-request (ARQ) is one of the most commonly used error control techniques today. In this paper, an error control technique that is a basic improvement over ARQ is presented. The technique uses the simple idea of utilizing erroneously received blocks in an ARQ system for error control, retaining most of the other aspects of ARQ. The technique is termed ARQ-with-memory (MRQ). The gene... View full abstract»

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  • Buffer Control for Transmission of Blocked Data Over Fading Channels

    Publication Year: 1977, Page(s):496 - 502
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    Since fading channels are characterized by frequent signal dropouts which are long compared to packet duration, substantial buffer space must be provided at both ends of the link. Systems which rely on selective, on/off transmission to achieve low bit error rates are seriously affected by the special conditions which must be imposed on them to prevent buffer overflow or underflow. This effect can ... 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