IEEE Transactions on Communications

Issue 5 • 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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    Freely Available from IEEE
  • 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 (26)
    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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  • 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 (1102 KB)

    Simulation results are presented for the error-rate performance of the recursive digital maximum a posteriori probability (MAP) detector for knownM-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 digit per second transmission ... 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 (670 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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  • Order Wire Transmission in Digital Microwave Systems

    Publication Year: 1974, Page(s):676 - 680
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (473 KB)

    Control, supervisory, and order wire signal transmission, i.e., service channel (SC) is a requirement for most microwave systems. In digital radio the data spectrum extends to the lowest baseband (BB) frequencies. Frequency translation of the SC above the data spectrum is one possibility. Another method, in frequent use, is the double modulation technique, e.g., the SC amplitude modulates the carr... 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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  • Estimation of Delay of M PPM Signals in Laguerre Communications

    Publication Year: 1974, Page(s):713 - 714
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (210 KB)

    In this note the maximum likelihood detector forMpulse-position-modulated (PPM) signals in Laguerre communications is derived. A decision-directed maximum likelihood estimator for the delay ofMPPM signals is discussed. 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 (440 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 anXband 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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  • 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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  • On the Threshold Performance of a PCM/FM Receiver

    Publication Year: 1974, Page(s):726 - 729
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (396 KB)

    Studies for the Skylab PCM links reveal that for a binary PCM/FM communication receiving system with a rectangular predetection bandpass filter, an ideal limiter discriminator and an ideal integrate-and-dump postdetection filter, suboptimal system performance can be achieved by choosing the largest possible value of deviation index which lies approximately at0.7 + 2n, wheren = 0,1,... View full abstract»

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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
  • 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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  • 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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  • On the Relationship Between Scintillation Index and Rician Fading

    Publication Year: 1974, Page(s):731 - 732
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (344 KB)

    The literature dealing with communication theory contains numerous analyses of the effect of fading on communications signals, while the literature dealing with ionospheric physics contains numerous models and measurements of ionosphericinduced scintillation. This correspondence relates the two; thus, the literature of each field can be applied to the other. 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 (4)
    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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  • An Occurrence of Very Heavy Rain on a 42-km Path

    Publication Year: 1974, Page(s):708 - 710
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (352 KB)

    Records of a 4-GHz 42-km propagation experiment near Atlanta, Ga. indicate that a squall line of heavy rain along the path caused 7-dB rain attenuation and degraded the cross-polarization discrimination from 27 dB down to 9 dB. 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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  • 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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  • 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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  • 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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  • Random-Access Digital Communication for Mobile Radio in a Cellular Environment

    Publication Year: 1974, Page(s):688 - 692
    Cited by:  Papers (5)
    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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  • Signal Coding Using Asynchronous Delta Modulation

    Publication Year: 1974, Page(s):729 - 731
    Cited by:  Papers (3)
    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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  • Adaptive Maximum-Likelihood Receiver for Carrier-Modulated Data-Transmission Systems

    Publication Year: 1974, Page(s):624 - 636
    Cited by:  Papers (379)  |  Patents (179)
    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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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