IEEE Transactions on Communications

Issue 3 • March 1980

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Displaying Results 1 - 16 of 16
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Deadlock Avoidance in Store-and-Forward Networks - I: Store-and-Forward Deadlock

    Publication Year: 1980, Page(s):345 - 354
    Cited by:  Papers (101)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1036 KB)

    Store-and-forward deadlock in store-and-forward networks may be avoided by forwarding messages from buffer to buffer in accordance with a loop-free directed buffer graph which accommodates all the desired message routes. Schemes for designing such buffer graphs are presented, together with methods for using them to forward the messages in an efficient and deadlock-free manner. These methods can be... View full abstract»

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  • Deadlock Avoidance in Store-and-Forward Networks - II: Other Deadlock Types

    Publication Year: 1980, Page(s):355 - 360
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (703 KB)

    This paper describes the construction of loop-free buffer graphs which avoid four types of buffer deadlocks in store-and-forward networks. 1) Progeny deadlock, where original messages spawnother ones, and buffer contention occurs between the original and progeny messages. This occurs when positive or negative acknowledgments are created, e.g., if messages reverse direction after encountering a pat... View full abstract»

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  • Noise Study of an Asynchronous Delta Sigma Modulator

    Publication Year: 1980, Page(s):375 - 379
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The steady-state probability density function of the error of an asynchronous delta sigma modulator in the presence of a dc input and additive Gaussian noise withRCpower spectrum is obtained by solving the Fokker-Planck equation. The error pdf plots are presented for different system parameters. View full abstract»

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  • An Effective Error Control Scheme for Satellite Communications

    Publication Year: 1980, Page(s):395 - 401
    Cited by:  Papers (42)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (651 KB)

    The conventional go-back-NARQ is inadequate for error control on satellite channels due to the large round-trip delay and high bit rate. The throughput efficiency of this system drops rapidly as the channel error rate increases. In this paper, a variation of the go-back-NARQ is described. This variation reduces the effect of the round-trip delay, and hence increases the syste... View full abstract»

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  • [Back cover - Advertisement]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Design and Evaluation of a Convolutional Codec in Additive White Gaussian Noise, Sinusoidal Interference, and Intersymbol Interference Environment

    Publication Year: 1980, Page(s):391 - 395
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    An integrated view of the performance of a rage 3/4, forwardacting, error-correcting convolutional codec, as used on the Intelsat single channel per carrier (SCPC) satellite communication system, is presented with respect to various transmission problems. The available literature does not indicate clearly whether such a codec would have acceptable performance in an environment involving detrimenta... View full abstract»

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  • A Technique for Adaptive Voice Flow Control in Integrated Packet Networks

    Publication Year: 1980, Page(s):325 - 333
    Cited by:  Papers (83)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    Integrated packet-switched networks have potential for providing improved performance by dynamically sharing transmission bandwidths between various users and user types, but new flow control methods are needed to deal with packetized voice traffic. This paper describes a packet voice flow control concept based on embedded speech coding. Results are presented from a computer simulation study of th... View full abstract»

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  • The Correlation of the Output of a Binary Convolutional Encoder

    Publication Year: 1980, Page(s):371 - 375
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    In this paper we discuss the correlation properties of the output of a binary convolutional encoder. We consider both random statistically independent inputs and first-order Markov inputs. It is shown that for random inputs, the ensemble average of the product of the outputs of a convolutional encoder taken two at a time is always either 0 or 1, and that for almost all good codes the ensemble aver... View full abstract»

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  • Fiber Optics Receiver Error Rate Prediction Using the Gram-Charlier Series

    Publication Year: 1980, Page(s):402 - 407
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    This paper applies the Gram-Charlier series method to the caculation of error probabilties in digital optical receivers. This method allows the calculation of "exact" error probabilities including the effects of avalanche noise, thermal noise, and arbitrary posidetection processing filter. The predictions of this method are compared with those of a simple Gaussian approximation and with the Cherno... View full abstract»

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  • Error Tolerant Adaptive Algorithms for Delta-Modulation Coding

    Publication Year: 1980, Page(s):385 - 391
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    This paper investigates the adaption of qnantizer step size in voice coding circuits. Techniques which maintain the decoder step size in the presence of channel errors have been evaluated. Graphs are presented for the comparison of error recovery performance. Practical considerations favor one algorithm, and its digital implementation has been described in the paper. Laboratory measurements of ste... View full abstract»

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  • Signal Parameter Optimization for the Impulsive Noise Channel

    Publication Year: 1980, Page(s):379 - 385
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A common assumption in the analysis of impulsive noise channels is that at most one noise impulse occurs to affect any given decision. In practice, this assumption is not always valid. However, in this work it is shown that optimum signals parameter values can be determined subject to the single noise impulse assumption. The analysis is based on a linear channel model, and the optimality criterion... View full abstract»

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  • Multiple User Variable Rate Coding for TASI and Packet Transmission Systems

    Publication Year: 1980, Page(s):334 - 344
    Cited by:  Papers (23)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    In this paper we examine the use of variable rate coding concepts for TASI and packet speech transmission systems. The paper is divided into three major parts. In the first part, the theoretical performance of variable rate coding is analyzed for multiple user (TASI) applications. Potential gains are experimentally determined from twoparty telephone conversation data for up to 12 shared conversati... View full abstract»

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  • Kalman Backward Adaptive Predictor Coefficient Identification in ADPCM with PCQ

    Publication Year: 1980, Page(s):361 - 371
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1184 KB)

    Kalman backward adaptive predictor coefficient identification is combined with a modified pitch-compensating quantizer (MPCQ) to produce a high-performance adaptive differential pulse code modulation (ADPCM) system for operation at data rates of 12-16 kbits/s. The Kalman/MPCQ system is compared to an ADPCM system using a Kalman algorithm and robust Jayant qnantization and to a system with a fixed-... View full abstract»

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  • Recursive Formulas for the Calculation of Point-to-Point Congestion

    Publication Year: 1980, Page(s):313 - 316
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    This paper presents recursive formulas for calculating the point-to-point congestion in a circuit-switched telecommunication network. This congestion value is derived from the individual blocking probabilities of each link, with or without regard to switch blocking. The approach is valid for alternate routing plans with a fixed sequence of route selection, using a link-by-link call setup procedure... View full abstract»

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  • Optimal Modernization Policies for Telecommunications Facilities

    Publication Year: 1980, Page(s):317 - 324
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    This paper considers a problem of telecommunications network modernization. The model presented provides the cost criterion corresponding to a general network evolution strategy which may consist of a combination of three basic policies: expansion of existing facilities; overlay of existing facilities with modern equipment to serve the growth; or replacement of existing facilities with modern equi... 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