IEEE Transactions on Communication Technology

Issue 2 • April 1968

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Displaying Results 1 - 24 of 24
  • [Front cover and table of contents]

    Publication Year: 1968, Page(s): 0
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    Freely Available from IEEE
  • Transportation or Communications Some Broad Considerations

    Publication Year: 1968, Page(s):195 - 198
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (530 KB)

    Communication is replacing travel or transportation in an increasing number of ways. It is argued that this substitution should be studied in detail, taking account of the economic, political, and psychological, as well as technical factors involved. The basic problem is formulated in terms of the ways in which the substitution can be made and the kinds of environment in which it might be made. A ... View full abstract»

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  • Error Control Techniques Using Binary Symbol Burst Codes

    Publication Year: 1968, Page(s):199 - 214
    Cited by:  Papers (17)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1285 KB)

    Much has been written on the theoretical description of error correcting codes but, due to a lack of actual channel error patterns, little has been said of practical performance. In this paper the performance of three types of error control is evaluated for the case of independent random errors and for an actual channel exhibiting dense bursts. The selected codes are burst codes with high probabil... View full abstract»

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  • Error Patterns Measured On Transequatorial HF Communication Links

    Publication Year: 1968, Page(s):215 - 221
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (570 KB)

    As part of the MITRE Corporation's program for improvement of HF communication, the performance of coding and a means for evaluating coding equipment has been presented. It is, however, preferable to have a channel model upon which various error control techniques can be tried out as opposed to the direct approach, which is available only to the possessor of the data. This paper has been developed... View full abstract»

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  • High Efficiency Multiple Access Communications Through a Signal Processing Repeater

    Publication Year: 1968, Page(s):222 - 232
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (987 KB)

    This paper describes a signal processing repeater which enhances the performance that can be obtained with random access discrete address (RADA) digital transmission links which operate in a multiple access mode. In general, RADA modulation techniques employ groups of pulses to transmit information. The pulses within a group normally have different carrier frequencies and are separated from each o... View full abstract»

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  • Spectral Characteristics of FDM-FM Signals

    Publication Year: 1968, Page(s):233 - 238
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (433 KB)

    The power spectrum of a sinusoidal carrier which is frequency modulated by a normally distributed baseband signal may be expanded as a sum of weighted convolution terms. The significant parameter in the expansion, for an ideally bandlimited baseband spectrum, isR_{x}(0) = R_{dot{x}}(0)/fminfmax whereR_{dot{x}}(0)is the mean squared frequency deviation andf View full abstract»

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  • On the Selection of Signals for Phase-Locked Loops

    Publication Year: 1968, Page(s):239 - 244
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (507 KB)

    The performance of phase-locked loops and related signal tracking devices is dependent upon the cross-correlation function between the input signal and a locally generated signal. This paper is concerned with the problem of selecting both the input and local signals so as to minimize the tracking error due to additive noise. View full abstract»

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  • Performance of Phase-Coherent Receivers Preceded by Bandpass Limiters

    Publication Year: 1968, Page(s):245 - 251
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (575 KB)

    In phase-coherent communication systems, where bandpass limiters precede the radio frequency (RF) carrier tracking loop, it is of interest to understand how the noisy RF carrier reference effects system performance. This paper characterizes a model probability distribution for the RF phase error and uses this to predict the performance of phase-shifted keyed and differentially coherent systems. Th... View full abstract»

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  • Synchronization of PCM Channels by the Method of Word Stuffing

    Publication Year: 1968, Page(s):252 - 254
    Cited by:  Papers (2)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (334 KB)

    The pulse stuffing technique for rate equalization of digital channels is extended in this article to the stuffing of a sequence of pulses (a word), which can be coded. The extra capacity needed for signaling the stuffed word decreases exponentially with the number of pulses in it, and may, in fact, be eliminated at a negligible increase in the error rate of the channel. View full abstract»

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  • Cycle Slipping in a First-Order Phase-Locked Loop

    Publication Year: 1968, Page(s):255 - 260
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (582 KB)

    In this paper a model for a carrier plus narrowband noise is presented, and with its aid the expected number of cycle slipping events per second for a first-order phase-locked loop (PLL) driven by a narrowband noise corrupted carrier, both with and without a limiter, is determined. Experimental data are presented which indicate the extreme accuracy of the results obtained with the use of this mode... View full abstract»

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  • A New Approach to FM Distortion

    Publication Year: 1968, Page(s):261 - 267
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (485 KB)

    Utilizing the theory of periodic distributions, a time domain solution to the problem of FM distortion in bandpass channels is developed. The demodulator output is obtained as a finite convolution of the channel impulse-train response with the FM signal. Distortion is calculated by comparing the demodulator output with the desired signal. View full abstract»

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  • COMET - A New Meteor-Burst System Incorporating ARQ and Diversity Reception

    Publication Year: 1968, Page(s):268 - 278
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1140 KB)

    A system has been built to make efficient use of meteor-trail reflections for telegraph communications in the VHF band over distances up to 2000 kin. The information is transmitted over the circuit in both directions at an instantaneous rate of 2000 bauds whenever a radio path is established by reflection from a meteor trail. The control of the flow of information is not based on an assessment of ... View full abstract»

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  • Waveguide Mixer Sum frequency Termination Considerations in an FM Communication System

    Publication Year: 1968, Page(s):279 - 282
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (359 KB)

    In a 6-GHz FM communications system using a mixer with its diode mounted in waveguide, group delay and linearity anomalies were observed which resulted in serious degradation of intermodulation signal-to-noise performance. This paper describes the problem, presents the reasoning and the laboratory tests by which improper termination of the mixergenerated sum frequency was isolated as its source, a... View full abstract»

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  • Comparison of Space-Polarization and Space-Frequency Diversities

    Publication Year: 1968, Page(s):283 - 288
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (617 KB)

    The effective orders of diversity were measured and compared for quadruple "space-polarization" and "space-frequency' configurations over the 375-mile transhorizon tropospheric radio path between East Island, Puerto Rico, and Grand Turk Island, Grand Bahama Islands. For quadruple-diversity configurations and simultaneous operation over the same (four) radio paths, space-polarization diversity was ... View full abstract»

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  • Intermodulation Distortion in Freqency-Division-Multiplex FM Systems - A Tutorial Summary

    Publication Year: 1968, Page(s):289 - 303
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1290 KB)

    In the design of FDM-FM communication systems, a great deal of importance is attached to an appreciation of those transmission irregularities that yield second- and third-order intermodulation spectra. Such spectra are readily generated by amplitude, phase, and AM/PM conversion anomalies within the FM transmission path. In this paper the results of the available journal literature have been rework... View full abstract»

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  • Analysis of a Hybrid Frequency - Time Hopping Random-Access Satellite Communication System

    Publication Year: 1968, Page(s):303 - 310
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (803 KB)

    This paper analyzes the multiple-access performance of a satellite communications network, in which each subscriber employs a hybrid frequency-time hopping random-access technique for the transmittal of binary information by means of a linear average power limited satellite repeater. The information is repetitively encoded into a number of binary chips. Individual mark and space chips are matched ... View full abstract»

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  • System 4000

    Publication Year: 1968, Page(s):311 - 315
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (553 KB)

    The evolution of a modular control and telemetry system with unusual flexibility for adapting to a wide spectrum of industrial applications is described. Basic logic functions are performed by integrated circuits. All wiring is printed. Unique design concepts permit application to a specific telemetry problem through computer selection of modules from a standard parts list. Modules plug into conne... View full abstract»

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  • Effect of Recorder Time-Base Error on an AM-Baseband Telemetry System

    Publication Year: 1968, Page(s):316 - 320
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (438 KB)

    A model of the demodulation portion of a suppressedcarrier AM-baseband telemetry system, incorporating the effect of tape recorder flutter, is developed. The carriers necessary for demodulation are derived from a single pilot by translation to the appropriate frequencies. The analysis illustrates how flutter affects system performance and shows that the effect is similar for both SSB and DSB syste... View full abstract»

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  • Design Considerations on Line Equipment for 10 800 Voice Channels

    Publication Year: 1968, Page(s):321 - 328
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (856 KB)

    This paper outlines the planning fundamentals of a 60-MHz coaxial system and describes the equipment concept for the transmission line. This is followed by design considerations on wideband repeaters; measurement results on transistors and various amplifier circuits are then discussed. The following problems and their solutions are also taken into account: remote power supply, power filters, dropp... View full abstract»

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  • A Unigauge Design Concept for Telephone Customer Loop Plant

    Publication Year: 1968, Page(s):328 - 336
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1065 KB)

    The unigauge concept permits the extension of both supervisory and transmission range in areas served by No. 5 crossbar and electronic switching system (ESS) from 1300 to 2500 ohms. This will be accomplished by placement of gain and range extension equipment in line links of the No. 5 equipment and the "B" links of the ESS equipment. The extension of range to 2500 ohms permits the exclusive use of... View full abstract»

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  • Further Results on Nyquist's Problem in Pulse Transmission

    Publication Year: 1968, Page(s):337 - 340
    Cited by:  Papers (75)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (303 KB)

    The Nyquist criterion specifies pulse shapes for a synchronous pulse amplitude modulation (PAM) signal which produce no intersymbol interference when the signal is sampled at the proper instants. For bandwidths in excess of one half the pulse repetition rate, the criterion is not uniquely satisfied. This paper considers the selection of pulse shapes for a single-sideband carrier signal which, in a... View full abstract»

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  • On Optimum Digital Phase-Locked Loops

    Publication Year: 1968, Page(s):340 - 344
    Cited by:  Papers (21)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (339 KB)

    This paper gives the design procedure of optimum digital filters for analog-digital phase-locked loops. The inputs considered are the step and ramp change in phase. The digital filters can easily be realized on the digital computer or otherwise. Design curves are given to choose proper noise bandwidth, sampling period, and loop parameters. It is shown that the optimum digitalanalog phase-locked lo... View full abstract»

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  • Comments on "Digital Transmission Capabilities of a Transportable Troposcatter System."

    Publication Year: 1968, Page(s):345 - 348
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (390 KB)

    The commentator clarifies the basis for certain theoretical aspects of communications originally published by himself and referenced in the subject paper. The author of the second paper, which appeared in IEEE Trans. on Communication Technology, vol. COM-15, pp. 421-433, June 1967, makes a joint reply with one of his colleagues. View full abstract»

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  • [Back cover]

    Publication Year: 1968, Page(s): 0
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    Freely Available from IEEE

Aims & Scope

This Transactions ceased publication in 1971. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope