IEEE Transactions on Communications

Issue 6 • June 1979

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

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • Maximum Likelihood Sequence Estimation for Randomly Dispersive Channels

    Publication Year: 1979, Page(s):833 - 839
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (677 KB)

    Receiver designs for maximum likelihood sequence estimation of digital data transmission through randomly dispersive channels are developed. The random channels are constrained to have finite memory of durationLin the sense that the casual minimum mean square error estimate of the channel output at any given time is a function of only the most recentLTseconds of observations.... View full abstract»

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  • The Stutter Go Back-N ARQ Protocol

    Publication Year: 1979, Page(s):869 - 875
    Cited by:  Papers (65)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (533 KB)

    In this paper we consider the problem of designing a good ARQ protocol for a message transmission environment characterized by high error rates and/or long propagation delays. We derive the average queue length for an idealized ARQ protocol for such an environment. We also describe a modification that can be made to existing ARQ protocols which can significantly decrease queue lengths in such an e... View full abstract»

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  • Two ADPCM Algorithms with Widely Separated Error Recovery Times

    Publication Year: 1979, Page(s):876 - 883
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    Two adaptive differential pulse code modulation (ADPCM) algorithms are discussed that provide for transmitter-receiver resynchronization when used in a non-zero error rate digital transmission medium. Novel techniques are used in the algorithms (e.g., step-size bias) and in their extensive characterization (e.g., intermodulation distortion measurements). View full abstract»

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  • Signal and Interference Output of a Bandpass Nonlinearity

    Publication Year: 1979, Page(s):888 - 891
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (377 KB)

    This paper deals with the passage ofmsignals along with additive Gaussian noise through a memoryless bandpass nonlinearity. It offers a method for finding the fundamental zone output attributable to anyninput signals (including their intermodulation) which at the same time specifies the equivalent new nonlinearity seen by these signals. The fundamental (i.e, bandpass) transfe... View full abstract»

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  • The SCEM-PLL and Ideal FM Detection: Part II - Noise and Distortion

    Publication Year: 1979, Page(s):925 - 927
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (313 KB)

    The conventional FM discriminator is subject to wideband distortion (WBD) which increases with increasing modulation frequency for wide frequency deviations. The output filtering for such discriminators cannot, in general, be optimized (i.e., in the Wiener sense). The SCEM-PLL (Sine-CosineE-Matrix Phase-Lock-Loop) is not subject to WBD; also, optimum output filtering can be used. Experi... View full abstract»

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  • Correction to "Speech coding"

    Publication Year: 1979, Page(s): 932
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    First Page of the Article
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  • [Back cover]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • Efficient Pulse Shaping Using MSK or PSK Modulation

    Publication Year: 1979, Page(s):927 - 930
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    The increasing requirement for high data rate, bandwidth efficient digital radio systems has led to the development of MSK-type modulation methods designed to achieve a compact signal spectrum. These modulation methods include sinusoidal frequency shift keying (SFSK), special MSK-type pulse shapes, and multiamplitude minimum shift keying (MAMSK). When more compact signal spectra are required, band... View full abstract»

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  • A Study of Users' Buffer Variations in Random Access Satellite Channels

    Publication Year: 1979, Page(s):857 - 868
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    A novel approach to modeling the slotted-ALOHA random access channel is presented. The objectives of the model are threefold: (1) to identify the channel's stability boundaries analytically as a function of the system's independent input parameters; (2) to investigate the impact of buffer-control on the channel's behavior; and (3) to facilitate the structuring of individual users' buffer-control a... View full abstract»

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  • Polar Quantization of a Complex Gaussian Random Variable

    Publication Year: 1979, Page(s):892 - 899
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    We solve numerically the optimum fixed-level non-uniform and uniform quantization of a circularly symmetric complex (or bivariate) Gaussian random variable for the mean absolute squared error criterion. For a given number of total levels, we determine its factorization into the product of numbers of magnitude and phase levels that produces the minimum distortion. We tabulate the results for number... View full abstract»

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  • Digital Transmission Over Existing Subscriber Cable

    Publication Year: 1979, Page(s):918 - 924
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    The paper first describes strategies to permit the smooth transition to all-digital operation in the subscribers' area. This emphasizes the essential employment of the existing network to support alldigital working. Two particular aspects of the many factors relevant to such realization are then highlighted-signaling and transmission. It is claimed that the former must provide a rich signaling rep... View full abstract»

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  • On a Mixed Mode Multiple Access Scheme for Packet-Switched Radio Channels

    Publication Year: 1979, Page(s):906 - 911
    Cited by:  Papers (9)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    We extend the study of access schemes for packet-switched radio channels as an alternative to conventional wire communications for data transmission among users. Among the various multiple access schemes previously implemented or proposed, ALOHA presents many advantages, especially for a large population of bursty users. However, more than 60% of the ALOHA channel capacity is wasted. In this paper... View full abstract»

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  • Differential Detection of MSK with Nonredundant Error Correction

    Publication Year: 1979, Page(s):912 - 918
    Cited by:  Papers (54)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    A proposed scheme for differential detection of MSK with nonredundant error correction utilizes the output detected from the difference in phase between alternate signaling intervals, along with the output of the conventional differential detector, in accordance with the concept of a convolutional error correcting code. Theoretical analysis and experimental results show that the degradation from c... View full abstract»

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  • An Assigned-Slot Listen-Before-Transmission Protocol for a Multiaccess Data Channel

    Publication Year: 1979, Page(s):846 - 857
    Cited by:  Papers (23)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1088 KB)

    In the multiaccess protocol described in this paper, users are each assigned specific slots of time in which to listen to the channel and determine if the channel is busy or idle. If the channel is idle, a ready user may transmit a fixed length message, or packet; otherwise he must wait a random time and try again. When two or more users transmit simultaneously, none are successful and each must r... View full abstract»

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  • A Modified Huffman Procedure with Reduced Memory Requirement

    Publication Year: 1979, Page(s):930 - 932
    Cited by:  Papers (10)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The usual Huffman procedure for source coding requires a codebook memory for translation of the source messages into variable-length codewords. When some of the source messages are highly improbable, the size of the required codebook becomes very large. This correspondence proposes a modification of the Huffman procedure to reduce the size of the required memory under those conditions. View full abstract»

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  • Optimum Finite Duration Nyquist Signals

    Publication Year: 1979, Page(s):884 - 888
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    This paper deals with the design of finite duration signals, which maximize spectral content inside a given band and which avoid intersymbol interference by being orthogonal to discretely delayed versions of itself. The signal is a solution of an integral equation With constraints. Techniques for numerically solving this equation are given. The signals are compared to the classical prolate spheroi... View full abstract»

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  • Channel Equalization Using Adaptive Lattice Algorithms

    Publication Year: 1979, Page(s):899 - 905
    Cited by:  Papers (129)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    In this paper, a study of adaptive lattice algorithms as applied to channel equalization is presented. The orthogonalization properties of the lattice algorithms make them appear promising for equalizing channels which exhibit heavy amplitude distortion. Furthermore, unlike the majority of other orthogonalization algorithms, the number of operations per update for the adaptive lattice equalizers i... View full abstract»

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  • Resynch Procedures and a Fail-Safe Network Protocol

    Publication Year: 1979, Page(s):840 - 845
    Cited by:  Papers (32)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    In this paper a new class of network synchronization procedures, called Resynch Procedures, is described. A resynch procedure is a mechanism for effectively bringing all nodes of a distributed network to a known state simultaneously, despite arbitrary finite delays between nodes. The procedures presented have the interesting property that no time-outs are required. One use of a resynch procedure i... 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