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IEEE Transactions on Communications

Issue 5 • Date May 1974

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Displaying Results 1 - 25 of 30
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): 0
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  • Survivability Analysis of Command and Control Communications Networks - Part I

    Publication Year: 1974, Page(s):589 - 595
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    This paper is the first of a two part study summarizing the results of a research program on the survivability analysis of command and control communication(C^{3})systems. In the first part, we consider the formulation of realistic survivability models and criteria, determine the fundamental physical problems affecting survivability analysis, and determine suitable approaches to the sur... View full abstract»

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  • Survivability Analysis of Command and Control Communications Networks - Part II

    Publication Year: 1974, Page(s):596 - 605
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1091 KB)

    This paper is the second of a two-part study summarizing the results of a research program on the survivability analysis of command and control communication(C^{3})systems. In the first part, we consider the formulation of realistic survivability models and criteria and the fundamental physical problems affecting survivability analysis. In this paper, we first discuss algorithms for det... View full abstract»

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  • The Range Extender with Gain - A New Telephone System Loop Extender

    Publication Year: 1974, Page(s):681 - 684
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Approximately 2 percent of Bell System loops are longer than the central office switching equipment design limit of 1300 Ω. These long loops require treatment on a special basis with the use of so-called long line circuits and voice frequency repeaters. The complexity, cost, and lack of a simple way to test the loop through these circuits led to a new design. In this paper, we describe the RE... View full abstract»

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  • Comments on "Effect of Multipath on Ranging Error for an Airplane-Satellite Link"

    Publication Year: 1974, Page(s): 726
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (139 KB)

    First Page of the Article
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  • Introduction to Diffraction,Information Processing, and Holography

    Publication Year: 1974, Page(s):732 - 733
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • Intersymbol Interference in an FM-DCPSK System

    Publication Year: 1974, Page(s):660 - 670
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (968 KB)

    A digital computer simulation of a frequency-modulation differentially coherent phase-shift-keying (FM-DCPSK) system is described. This simulation program is used to investigate the effect of intersymbol interference on the error-rate performance of the two- and four-phase system. Nyquist channels have been obtained and verified. Performance curves are presented to facilitate system design. View full abstract»

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  • A New Synchronization Technique for Switched TDMA Satellite Systems

    Publication Year: 1974, Page(s):710 - 713
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A coarse search synchronization technique is described for switched time division multiple access (TDMA) satellite systems, using a coded search signal. It is shown that this method achieves coarse search synchronization much faster, on the average, than the burst synchronization method described by Rapuano and Shimasaki. A description of an integrated synchronization system that combines the code... View full abstract»

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  • A Unified Representation of Differential Pulse-Code Modulation (DPCM) and Transform Coding Systems

    Publication Year: 1974, Page(s):692 - 696
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    We consider a transform coding system that uses a lower-triangular transformation to uncorrelate the data. Based on this transformation we propose a generalized differential pulse code modulation (DPCM) system and show that at high bit rates it performs almost as well as coding by the method of principal components (Karhunen-Loeve transformation). This study connects the transform coding system to... View full abstract»

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  • Signal Coding Using Asynchronous Delta Modulation

    Publication Year: 1974, Page(s):729 - 731
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A description is given for a delta modulation system wherein the sampling interval is varied as a function of the characteristics of the signal to be coded. The system thus operates asynchronously as compared with the usual delta modulator, and permits the transmission of fewer samples during periods of small signal variation. The algorithm used for sampling interval variation is common to both tr... View full abstract»

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  • Channel Multiplexing Network for a Millimeter Waveguide Transmission System

    Publication Year: 1974, Page(s):714 - 721
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    The Nippon Telegraph and Telephone Public Corporation (NTT) plans to make a field test for the practical application of the W-40G millimeter waveguide transmission system, using a frequency range of 43 GHz to 87 GHz and a clock frequency of 403 MBd. This paper describes channel multiplexing-demultiplexing networks fabricated for use in the test. First, frequency allocation and construction of the ... View full abstract»

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  • Telemedicine: New Application of Communications Technology

    Publication Year: 1974, Page(s):685 - 688
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Telemedicine may be defined as the practice of medicine at long distance by means of telecommunications, in particular, closed-circuit television and telemetry. Two-way television enables physicians to establish a nominal doctor-patient relationship with patients at a remote location, while providing the means for visual examination of patients. Biomedical telemetry transmits patients' vital signs... View full abstract»

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  • Distortion in SSB-AM Signals Demodulated via Envelope Detection and Hilbert Transform Processing

    Publication Year: 1974, Page(s):605 - 613
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    It is known that, under certain conditions, the logarithm of the envelope and the instantaneous phase deviation of a singlesideband amplitude-modulated (SSB-AM) channel signal form Hilbert pairs. This minimum phase relationship has previously been employed to demodulate SSB-AM asynchronously and without distortion. The demodulator consisted of an envelope detector followed by nonlinear post-detect... View full abstract»

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  • Transient Statistics of the First-Order Phase-Locked Loop

    Publication Year: 1974, Page(s):698 - 703
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The transient behavior of the phase-error probability density function of the first-order phase-locked loop (PLL) in the presence of additive white Gaussian noise is determined using numerical techniques. In addition, the modulo-2π probability density function and cycle-slipping density functions are found. The algorithm used in these calculations involves numerical integration of a modified ... View full abstract»

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  • A Protocol for Packet Network Intercommunication

    Publication Year: 1974, Page(s):637 - 648
    Cited by:  Papers (107)  |  Patents (181)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1464 KB)

    A protocol that supports the sharing of resources that exist in different packet switching networks is presented. The protocol provides for variation in individual network packet sizes, transmission failures, sequencing, flow control, end-to-end error checking, and the creation and destruction of logical process-to-process connections. Some implementation issues are considered, and problems such a... View full abstract»

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  • Adaptive Maximum-Likelihood Receiver for Carrier-Modulated Data-Transmission Systems

    Publication Year: 1974, Page(s):624 - 636
    Cited by:  Papers (359)  |  Patents (167)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1352 KB)

    A new look is taken at maximum-likelihood sequence estimation in the presence of intersymbol interference. A uniform receiver structure for linear carrier-modulated data-transmission systems is derived which for decision making uses a modified version of the Viterbi algorithm. The algorithm operates directly on the output signal of a complex matched filter and, in contrast to the original algorith... View full abstract»

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  • Pulse-Frequency Communication Using Gunn Diodes

    Publication Year: 1974, Page(s):721 - 724
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    With the help of the relevant equations and new experimental data on Gunn-effect diodes, both with InP and with GaAs, pulse frequency modulation is discussed for 1 Gigapulse/s with an X band carrier. Improvements in switching speeds are reported by multifrequency operation during transient. The use of mode jumping for frequency shifting offers useful features. View full abstract»

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  • Performance of a Long Troposcatter Link in the Southeast Asia Equatorial Region

    Publication Year: 1974, Page(s):703 - 708
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    This paper presents the results of a propagation survey and the actual performance of a subsequently installed troposcatter system between East and West Malaysia, a distance of 739 km (463 mi), mainly over water. The survey was carried out at 1840 MHz and the installed system uses the 900-MHz band. The path attenuation results are compared with predictions based on the International Radio Consulta... View full abstract»

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  • Random-Access Digital Communication for Mobile Radio in a Cellular Environment

    Publication Year: 1974, Page(s):688 - 692
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    A random-access digital multiplex system is considered in the context of a cellular mobile radio system. Three different ways of implementing this technique in a cellular system are described. With the aid of certain simplifying assumptions, the techniques are compared as to their traffic-carrying capacity. View full abstract»

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  • On the Performance of Digital Phase Locked Loops in the Threshold Region

    Publication Year: 1974, Page(s):724 - 726
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Extended Kalman filter algorithms are used to obtain a digital phase lock loop structure for demodulation of angle modulated signals. It is shown that the error variance equations obtained directly from this structure enable one to predict threshold if one retains higher frequency terms. This is in sharp contrast to the similar analysis of the analog phase lock loop, where the higher frequency ter... View full abstract»

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  • Some Results for the Eye Patterns of Class 4 Partial Response Data Signals

    Publication Year: 1974, Page(s):696 - 698
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    Considering the eye-openings of a Class 4 partial response signal, expressions are derived for the horizontal eye-opening and for the vertical opening after single-sideband (SSB) transmission with a carrier phase error. The latter result is obtained at both the original sampling time and at the optimum sampling time. View full abstract»

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  • Baseband Diversity for Hybrid Microwave Systems

    Publication Year: 1974, Page(s):671 - 676
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A hybrid information carrier is defined as a carrier for partly analog and partly digital source information. Some of the reported schemes transmit 1.5 Mbits/s and 1200 frequency division multiplexing (FDM) channels, others 6.3 Mbits/s and 600 FDM channels, in the shared spectrum of the microwave baseband (BB). Baseband diversity (BBD) is frequently used in this type of system. As hybrid transmiss... View full abstract»

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  • Hybrid Coding of Pictorial Data

    Publication Year: 1974, Page(s):614 - 624
    Cited by:  Papers (49)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    Two hybrid coding systems utilizing a cascade of a unitary transformation and differential pulse code modulators (DPCM) systems are proposed. Both systems encode the transformed data by a bank of DPCM systems. The first system uses a one-dimensional transform of the data where the second one employs two-dimensional transformations. Theoretical results for Markov data and experimental results for a... View full abstract»

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  • Simulation Results for the Decision-Directed MAP Receiver for M-ary Signals in Mulitiplicative and Additive Gaussian Noise

    Publication Year: 1974, Page(s):649 - 660
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1112 KB)

    Simulation results are presented for the error-rate performance of the recursive digital maximum a posteriori probability (MAP) detector for known M -ary signals in multiplicative and additive Gaussian noise. The structure of the digital simulation of the optimum detector is generally described, with specific results obtained for a quaternary signal and 2500 di... 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