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IEEE Transactions on Communication Technology

Issue 3 • June 1968

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Displaying Results 1 - 25 of 31
  • [Front cover and table of contents]

    Publication Year: 1968, Page(s): 0
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    Freely Available from IEEE
  • Asynchronous time multiplexing

    Publication Year: 1968, Page(s):349 - 357
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1023 KB)

    The use of asynchronous adaptive sampling for multiplexing multichannel analog signals and data over a synchronous digital facility is examined. This method promises to provide an efficient and consistent way to digitally transmit voice, line-scanned graphics or text, and data. Buffer analysis, computer simulations, and laboratory prototypes are described. When multiplexing speech using extremal s... View full abstract»

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  • Traffic Considerations with TONE-DIAL® Telephones

    Publication Year: 1968, Page(s):357 - 364
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (916 KB)

    This paper compared two methods of operation of receivers for pushbutton calling using voice frequency signaling. It compares the traditional system in which the tone receiver is connected for the full dialing interval with a system in which the receiver is connected only during the instant of tone generation when a pushbutton is operated. Not surprisingly, the results indicate that a smaller numb... View full abstract»

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  • Dictionary of English Language Traffic Terms

    Publication Year: 1968, Page(s):365 - 369
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (469 KB)

    A list of English language terms related to the handling of traffic, which are in use by manufacturers and users of communication systems, is provided. The list was prepared by the Nomenclature Committee of the International Teletraffic Congress and represents current usage rather than an adopted standard. View full abstract»

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  • Signaling of Remotely Controlled Railway Trains

    Publication Year: 1968, Page(s):369 - 374
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (683 KB)

    A train control system has been evaluated in which a remote digital computer is used as the feedback element of a servomechanism. Telemetry signals are required between the train and computer and in the reverse direction, and engineering constraints are placed on the implementation. Signaling requirements are described, and experimental measurements of the electrical noise and ensuing analyses are... View full abstract»

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  • Data Transmission Through a Random Noisy Channel by PAM

    Publication Year: 1968, Page(s):375 - 379
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (474 KB)

    A criterion of minimum mean square error is used to specify the optimum, linear, time-invariant equalizer for a system in which data are transmitted by pulse amplitude modulation through a randomly selected channel. The results are applied to the case in which the received pulse is a synchronous demodulation of a passband pulse, with the phase of the demodulating oscillator a random variable and w... View full abstract»

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  • Performance Monitor Techniques for Digital Receivers Based on Extrapolation of Error Rate

    Publication Year: 1968, Page(s):380 - 387
    Cited by:  Papers (15)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (842 KB)

    There is a need in many digital communication systems to estimate the current digital error rate of the receiver without the use of special transmissions and without interrupting traffic flow. Devices for performing this function have been termed performance monitor units (PMU). As an element of an adaptive communication system, the PMU could be used to determine when adaptive change is needed and... View full abstract»

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  • A Performance Monitoring Scheme for FSK Transmission over Fading Channels

    Publication Year: 1968, Page(s):388 - 392
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    A scheme for monitoring performance of a frequency-shift-keyed (FSK) transmission over a selectively fading channel with a nonfading component is treated. The design of the monitoring scheme is based heavily on the assumption that the received signal and additive noise are Gaussian. The monitoring requires no special test signal. An asymptotically unbiased estimate of error probability is obtained... View full abstract»

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  • Maximum-Likelihood Receiver for Digital Data Transmission

    Publication Year: 1968, Page(s):392 - 398
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    The maximum-likelihood (ML) receiver for binary data, additive Gaussian noise, and nearest-neighbor intersymbol interference (ISI) is shown to be a matched filter followed by a feedback loop and a tapped delay line. The loop and the tap connections contain nonlinear amplifiers, each saturating at the level of the ISI. This receiver minimizes the persymbol probability of error Pe; upper ... View full abstract»

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  • Cascade Decoding of Cyclic Product Codes

    Publication Year: 1968, Page(s):398 - 402
    Cited by:  Papers (15)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (518 KB)

    In this paper, it is shown how to synthesize simple decoders for cyclic product codes. Cyclic product codes may be synthesized in the form of interlaced codes if the block lengths of the codes are relatively prime. In this case, the decoder can be synthesized in the form of a cascade of decoders, each of which operates on one of the subcodes forming the product code. The cascade decoders described... View full abstract»

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  • Suboptimum Rank Detection Procedures Using Rank Vector Codes

    Publication Year: 1968, Page(s):402 - 410
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (758 KB)

    A nonparametric detection scheme using only the relative ordering information of a set of samples is applied to the problem of signal discrimination. A class of codes called rank vector codes is presented and their application in this suboptimum discrimination scheme is discussed. View full abstract»

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  • Error Performance of Differential Phase-Shift Transmission over a Telephone Line

    Publication Year: 1968, Page(s):411 - 419
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (890 KB)

    This paper considers differential phase-shift transmission over a bandlimited channel with specified phase and amplitude characteristics. The problem treated is the prediction of feasible data rates and corresponding error rates over such channels. An expression is given for the probability of error. This expression takes into account intersymbol and interchannel interference when differential pha... View full abstract»

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  • Phase Measurement Accuracy with Modulated Sounding Signals

    Publication Year: 1968, Page(s):419 - 429
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (867 KB)

    In this paper the problem of measuring an unknown carrier phase shift of a transmitted sounding signal in a Gaussian noise channel is considered. Receivers which minimize the probability that phase error is larger than some value are considered. In some cases, this criterion leads to simple phase measurement techniques. When it does not, suboptimum receivers are considered. The main objective is t... View full abstract»

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  • A Performance Monitoring Technique for Arbitrary Noise Statistics

    Publication Year: 1968, Page(s):430 - 435
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (538 KB)

    A technique for monitoring performance of a pilottone phase-shift-keyed system over fading channels is treated. An important feature of this technique is that it requires no prior knowledge of the statistics of the additive noise or interference. The error probability is estimated without interrupting the data transmission or sending a special test signal. The measurement time required for a relia... View full abstract»

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  • A Pseudorandom Multiplex System for Facsimile Transmission

    Publication Year: 1968, Page(s):436 - 438
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (387 KB)

    In this paper, a novel facsimile transmission system is proposed in which several pseudorandomly scanned pictures are superimposed on one another and transmitted through a common channel. The noise in the received pictures due to cross-interference and channel disturbances is discussed, and some results from computer simulation are presented. View full abstract»

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  • Communications Via Seismic Waves Employing 80-Hz Resonant Seismic Transducers

    Publication Year: 1968, Page(s):439 - 444
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (687 KB)

    The design, construction, deployment, and operating characteristics of experimental 80-Hz resonant seismic transmitterand receiver-transducers are discussed. A description is given of seismic-acoustic measurements and experiments involving 80-Hz signal transmissions 1) between surface sites in flat terrains, 2) between surface sites in mountainous terrains, 3) between locations on lake ice, and 4)... View full abstract»

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  • A Ray-Tracing Analysis of a Prolonged Fadeout on an Obstacle-Diffraction Radio Path

    Publication Year: 1968, Page(s):445 - 450
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (591 KB)

    A prolonged fadeout on a long obstacle-diffraction radio path was probably caused by persistent super-refractive conditions in the lower atmosphere. Ray tracings based upon the observed refractivity profiles at nearby radiosonde stations indicated that during the outage period the beam intersected several high ridges in front of the diffracting obstacle, greatly increasing transmission loss on the... View full abstract»

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  • Combiner Performance Using Narrow-Band Noise Filtering and Enhanced Squelch

    Publication Year: 1968, Page(s):451 - 455
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    The use of "narrow-band" noise filters in the combiner control circuits of a quadruple-diversity post-detection combiner was found to reduce the average bit-error rate by a factor of 4.6; while the median output signal-to-noise ratio was increased by 2 dB. The use of an "enhanced-squelch" control of the postdetection combiner increased the output voice-channel signal-to-noise ratio by 3 dB, and ef... View full abstract»

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  • Compact High-Powered Frequency Multipliers for S-Band Telemetry Frequencies

    Publication Year: 1968, Page(s):456 - 459
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    This paper describes reliable solid-state stripline frequency multipliers that develop an output power in excess of 16 watts at S band. An overall efficiency of 46 percent is achieved for two cascaded doublers that have adequate varactor diode temperature derating to permit continuous operation at 90°C heat sink temperature. The stripline construction tech... View full abstract»

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  • The Monolithic FM Discriminator A New Piezoelectric Device

    Publication Year: 1968, Page(s):460 - 463
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (375 KB)

    The concept of controlled acoustic coupling between thickness shear trapped energy resonators fabricated on a single quartz plate led to the development of the monolithic crystal filter. Recent work at the Bell Telephone Laboratories has resulted in the development of a three-port monolithic structure capable of providing the frequency-selective network required for an FM discriminator. This devic... View full abstract»

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  • The Mathematical Equivalence of Digital Troposcatter Models

    Publication Year: 1968, Page(s):464 - 467
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (357 KB)

    In the past, various mathematical models have been developed for the digital troposcatter channel. Each model is amenable to the analysis of some types of systems but leads to mathematical difficulties in the analysis of others. When various transmission techniques are to be compared, a set of analyses which uses a different channel model for each system is not satisfactory unless it can be shown ... View full abstract»

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  • Monitoring, Telemetry, and Control for Rapid Transit

    Publication Year: 1968, Page(s):467 - 475
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (884 KB)

    The San Francisco Bay Area Rapid Transit District is building a new rapid transit system on which trains will operate automatically. Multipurpose channels and terminals will be used to monitor and control train operation, electrification, and support facilities. Incoming data and events are to be transmitted and processed digitally. System supervisory control signals, whether incoming or outgoing,... View full abstract»

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  • On Optimizing Subsystem Administrative Intrafaces in Telemetering and Supervisory Control Systems

    Publication Year: 1968, Page(s):475 - 478
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (530 KB)

    Complex telemetering, control, and supervisory systems ordinarily comprise a multitude of subsystems. Frequently, the entire system is controlled and/or maintained by two or more administrative entities. Thus, the interfaces between the various subsystems may involve administrative as well as electrical and mechanical considerations. It is evident that optimum functioning of the system requires th... View full abstract»

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  • PCM Data Reliability Monitoring Through Estimation of Signal-to-Noise Ratio

    Publication Year: 1968, Page(s):479 - 486
    Cited by:  Papers (66)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (590 KB)

    Reliability monitoring of digital pulse-code modulation (PCM) data in coherent transmission systems can be based upon online estimation of signal-to-noise ratio (SNR) at the receiver. Maximum likelihood SNR estimation is analyzed to determine the structure of the estimator and its ability to monitor error rates with a given degree of confidence. In particular, relationships between estimation conf... View full abstract»

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  • Spectral Analysis of a PAM-FM Signal

    Publication Year: 1968, Page(s):487 - 491
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    A PAM-FM telemetry system has been analyzed when the various sensors or telemetering transducers each monitor a stationary Gaussian random process (GRP). Each GRP sensor output is band limited and instantaneously sampled at the optimum rate. This optimum frequency is the minimum sampling rate that causes no signal distortion due to aliasing in the frequency domain. A maximum number of sensors are ... View full abstract»

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Aims & Scope

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

Full Aims & Scope