IEEE Transactions on Communications

Issue 3  Part 2 • June 1972

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  • [Front cover and table of contents]

    Publication Year: 1972, Page(s): 0
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  • Editorial

    Publication Year: 1972, Page(s): 263
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  • Subjective Effects of Channel Transmission Errors on PCM and DPCM Voice Communication Systems

    Publication Year: 1972, Page(s):281 - 290
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (999 KB)

    Isopreference tests were used to study the subjective effects of channel transmission errors on computer-simulated PCM and previous-sample feedback DPCM voice systems. Numerically scaled isopreference contours were obtained and plotted on planes having as axes the number of quantization bitsNand the bit error probabilitypof the binary symmetric transmission channel. For any View full abstract»

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  • Interleaving and Error-Burst Distribution

    Publication Year: 1972, Page(s):291 - 296
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (481 KB)

    A simple partitioned Markov chain model is proposed for characterization of the HF channel. It is demonstrated that from the model, the error-burst distribution can be derived with good agreement with simulation results. In this paper the transition probability matrixPof the model is raised to theNth power PN. PNis used to represent the channel after int... View full abstract»

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  • Performance Measures for Transform Data Coding

    Publication Year: 1972, Page(s):411 - 415
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (609 KB)

    This paper develops performance criteria for evaluating transform data coding schemes under computational constraints. Computational constraints that conform with the proposed basis-restricted model give rise to suboptimal coding efficiency characterized by a rate-distortion relationR(D)similar in form to the theoretical rate-distortion function. Numerical examples of this performance m... View full abstract»

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  • Interplex - An Efficient Multichannel PSK/PM Telemetry System

    Publication Year: 1972, Page(s):415 - 419
    Cited by:  Papers (21)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (554 KB)

    This paper describes a new phase-shift-keyed/phasemodulation (PSK/PM) scheme, called Interplex, which improves the performance of multichannel telemetry systems by reducing the cross-modulation loss. In the case of two-channel systems, the improvement in data power efficiency relative to a conventional system can be as much as 3 dB. A major feature of Interplex is that it can be implemented with v... View full abstract»

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  • An Information-Feedback Approach Applied to Polarization-Modulated Laser Communication Systems

    Publication Year: 1972, Page(s):419 - 423
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (433 KB)

    The use of an information-feedback procedure, called "feedback averaging," is applied to anM-ary polarization-modulated laser communication system. The systems with and without feedback, which are limited by photon fluctuation, are considered and compared. A significant improvement in error rate of a system with feedback is demonstrated over a one-way system for a quarternary system sub... View full abstract»

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  • Coherent Demodulation of Frequency-Shift Keying with Low Deviation Ratio

    Publication Year: 1972, Page(s):429 - 435
    Cited by:  Papers (158)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (705 KB)

    A coherent binary FSK modulation system is discussed, that has the following properties: 1) it is phase coherent; 2) it has a low deviation ratio,h = frac{1}{2}; 3) it occupies a small RF bandwidth, typically only 0.75 times the bit rate, without need for intersymbol interference correction; 4) it uses as receiver a self-synchronizing circuit and a phase detector, which together achieve... View full abstract»

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  • Equivalance of Time-Multiplexed and Frequency-Multiplexed Signals in Digital Communications

    Publication Year: 1972, Page(s):435 - 438
    Cited by:  Papers (2)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (426 KB)

    In comparing different techniques for multiplexingNbinary data signals into a single channel, time-division multiplexing (TDM) is known to have a theoretic efficiency of 100 percent (neglecting sync power) and thus seems to outperform frequencydivision multiplexing systems (FDM). By considering more general FDM systems, we will show that both TDM and FDM are equivalent and have an effic... View full abstract»

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  • On the Selection of a Sampling Filter Bandwidth for a Digital Data Detector

    Publication Year: 1972, Page(s):438 - 441
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (343 KB)

    We consider here the problem of selecting the lowpass sampling bandwidth for a digital mechanization of a matchedfilter bit-synchronizer combination. In particular, if digital data at a rateRbits/second plus Gaussian noise is passed through a filter of bandwidthKRand then sampled at the Nyquist rate, i.e.,2 KR, then how small can we chooseKwithout paying... View full abstract»

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  • Carrier Synchronization and Detection of Polyphase Signals

    Publication Year: 1972, Page(s):441 - 454
    Cited by:  Papers (29)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (875 KB)

    Digital communication networks used for the distribution of high-speed digital information are currently the subject of design studies for many civil and military applications. This paper presents results that are useful in such studies as well as in network planning. In particular, the paper is concerned with the problems of carrier synchronization and noisy reference detection of polyphase signa... View full abstract»

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  • The Amplitude Density of a Truncated Fourier Series

    Publication Year: 1972, Page(s):483 - 485
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (286 KB)

    A theoretical method is presented for finding the amplitude density of a periodic waveform expressed in terms of a truncated trigonometric Fourier series. If the waveform is approximated bynharmonics, the density depends on the roots of a polynomial of degree 2nwhose coefficients are simple functions of the Fourier series coefficients. View full abstract»

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  • Comments on "The Divergence and Bhattacharyya Distance Measures in Signal Selection"

    Publication Year: 1972, Page(s): 485
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    First Page of the Article
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  • Comparative Performance Results for Three Rate 1/2 Burst-Trapping Codes

    Publication Year: 1972, Page(s):485 - 487
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (303 KB)

    This paper presents comparative performance results for three ratefrac{1}{2}burst-trapping error-correcting codes using real channel error data gathered by USAECOM on microwave and/or wide-band cable links operating at 40.8 kbits/s. A limited amount of error data gathered on the German telephone network has also been used. View full abstract»

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  • Correction to "Random FM in Mobile Radio With Diversity"

    Publication Year: 1972, Page(s): 487
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (106 KB)

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  • Correction to "Piecewise Fourier Transformation for Picture Bandwidth Compression"

    Publication Year: 1972, Page(s):488 - 492
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1159 KB)

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  • Correction to "A Survery of Coding Schemes for Transmission or Recording of Digital Data"

    Publication Year: 1972, Page(s): 492
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (183 KB)

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  • Issues in Computer Communications

    Publication Year: 1972, Page(s):495 - 498
    Cited by:  Papers (1)
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  • TYMNET - A Serendipitous Evolution

    Publication Year: 1972, Page(s):511 - 515
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (510 KB)

    TYMNET is a large full duplex terminal oriented network that has been developed by Tymshare, Inc. The network is composed of over 100 interconnected computers serving as hosts or nodes. The evolution of this network was made possible by resolving a variety of hardware, software, and telecommunications problems. This paper describes the steps that took place in this evolution, the problems that wer... View full abstract»

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  • Loop Transmission Systems - Mean Value Analysis

    Publication Year: 1972, Page(s):592 - 602
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    A simple analytical model is developed for loops with centralized control, random slot seizure, and fixed slot duration. Slots are assumed to be generated at regular intervals, regardless of whether they are utilized or not, while requests for service at terminals attached to the loop are described by Poisson arrival statistics, For loops used for data collection, mean waiting-line lengths and que... View full abstract»

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  • [Back cover]

    Publication Year: 1972, Page(s): 0
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    Freely Available from IEEE
  • Gaussian and Click Noise in an FM/FM Multiplex Receiver

    Publication Year: 1972, Page(s):373 - 381
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    An FM/FM system is one in which the signal information frequency modulates a subcarrier, which, in turn, frequency modulates a main carrier for transmission. The detection process then involves two frequency demodulators in sequence. Using Rice's click model for both FM demodulators, we obtain the average click rate and an approximate output spectrum that include the effect of the impulses generat... View full abstract»

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  • Performance Measurements on the ARPA Computer Network

    Publication Year: 1972, Page(s):630 - 636
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    An extensive measurement capability has been implemented in the interface message processors (IMP) of the ARPA network of computers. These measurement facilities were implemented by the network contractor, Bolt, Beranek, and Newman, Inc., to meet the measurement needs of the University of California, Los Angeles, (UCLA) network measurement center, and consist of software routines within the store-... View full abstract»

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  • Overseas AUTOVON Systems Testing for Acceptance and Cutover

    Publication Year: 1972, Page(s):399 - 403
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    On June 7, 1969, a major milestone in the augmentation of the Defense Communications System's global automatic voice network (AUTOVON) was achieved with the simultaneous cutover into an operational network of four automatic switching centers in Europe and one in Panama. With this cutover, for the first time direct-distance dialing on a worldwide basis became possible for AUTOVON subscribers. This ... View full abstract»

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  • A Communications Interface for Computer Networks

    Publication Year: 1972, Page(s):550 - 556
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    The scope of this paper is to describe the architecture of a communications line protocol for computer networks. Development and implementation details will be introduced where necessary to clarify the presentation. The need for an architecture to facilitate interprocessor communications has been a requirement to the computing industry for several years. The described line protocol was derived thr... 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