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IEEE Transactions on Communication Technology

Issue 1 • February 1968

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

    Publication Year: 1968, Page(s): 0
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    Freely Available from IEEE
  • Synchronization of a PCM Integrated Telephone Network

    Publication Year: 1968, Page(s):1 - 11
    Cited by:  Papers (21)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1038 KB)

    To compose a telephone network with low transmission loss without cumulative increase of quantizing noise, it is desirable to accomplish both transmission and switching with PCM modulation. Such a system, called an integrated telephone network, requires synchronization of incoming signals arriving at each exchange to the local timing pulse generator controlling a time division switch of the exchan... View full abstract»

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  • Communications for Time Sharing at Bell Telephone Laboratories

    Publication Year: 1968, Page(s):12 - 18
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (763 KB)

    The communications system proposed for provision of remote access to computers for users at Bell Telephone Laboratories is described with emphasis on the dial terminal arrangements. It is planned to offer time-sharing services from four large-scale computers located at the four major Bell Telephone Laboratories installations: three in New Jersey and one in Illinois. Provision of full flexibility o... View full abstract»

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  • Effects of Sampling Contact Design on TDM System Tranmission Performance

    Publication Year: 1968, Page(s):19 - 25
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (790 KB)

    Performance requirements are established for practical time-division multiplex (TDM) sampling and distribution contacts for use in high speed TDM systems employing the resonant transfer technique. Various contact designs and their shortcomings are discussed. Actual system transmission performance of a 128 time-slot TDM switching system is presented. View full abstract»

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  • TONE-DIAL® Telephones Applied to Direct Control Exchanges

    Publication Year: 1968, Page(s):26 - 29
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (474 KB)

    This paper describes the method by which direct control telephone systems may be adapted to receive tone signals from the subscriber instrument. The methods of association of the common equipment and control of connections during the signaling period are outlined together with the intermediate storage techniques that are used. The guards employed to assure receipt of only legitimate signals are in... View full abstract»

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  • Adaptive Feedback Communications

    Publication Year: 1968, Page(s):29 - 34
    Cited by:  Papers (162)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (590 KB)

    A scheme for transmitting binary signals through a Rayleigh fading multipath medium is analyzed. The scheme envisions an adaptive receiver and a feedback channel. The feedback channel conveys information to the transmitter on the forward channel state learned at the receiver. The transmitter uses this information to modify transmission. Results that show the improvement in performance of the syste... View full abstract»

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  • Error Rate for Peak-Limited Coherent Binary Channels

    Publication Year: 1968, Page(s):35 - 44
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    An exponential-type bound on error rate Pefor peaklimited binary coherent channels operated at low signal-to-noise ratio (SNR) is presented. The bound depends exponentially only on the first and second moments of the channel output and serves to justify, in part, the use of SNR calculations for error-rate performance. It is assumed that the receiver output ... View full abstract»

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  • Performance of Analog Demodulators in a Fading Environment

    Publication Year: 1968, Page(s):45 - 51
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (651 KB)

    Various structures have recently been obtained for optimally demodulating analog signals transmitted over a noisy, randomly fading channel. Their performance, in a least mean-signal error sense, is evaluated in this paper. In the case of the optimum linear filter for AM (or equivalent baseband) signals, as the carrier-to-noise ratio increases indefinitely, an irreducible error is found. The Cram&#... View full abstract»

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  • Spectral Properties of Single-Sideband Angle Modulation

    Publication Year: 1968, Page(s):52 - 62
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (766 KB)

    The generation of single-sideband angle-modulated (SSB- \phi M ) waves compatible with conventional detection methods requires involved processing. The result of these operations yields a signal whose spectral properties are more complicated than simply being one-sided versions of the analogous double-sideband spectrum, and hence it is not obvious whether or... View full abstract»

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  • Signal-to-Crosstalk Power Radio in Smoothly Limited Multichannel FDM Signals

    Publication Year: 1968, Page(s):63 - 67
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The passage of multichannel frequency division multiplexed (FDM) signals through an amplitude limiting nonlinear device produces crosstalk in each channel output due to intermodulations among signals in all channels. The signal power S0to crosstalk power Ncratio in any particular channel determines signal degradation. This paper considers multichannel FDM signals passing thro... View full abstract»

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  • On the Probability of Error for Multichannel Reception of Binary Signals

    Publication Year: 1968, Page(s):68 - 71
    Cited by:  Papers (35)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (325 KB)

    In this paper a derivation of the probability of error which arises in 1) adaptive multichannel reception of binary signals and 2) multichannel communication with binary signaling over channels that are characterized by both a specular (nonfading or constant) component and a Rayleigh fading component is presented. View full abstract»

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  • Probabilities of Error for Adaptive Reception of M-Phase Signals

    Publication Year: 1968, Page(s):71 - 81
    Cited by:  Papers (115)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1010 KB)

    Probabilities of error are derived for 2- and 4-phase signaling over an L -diversity branch, time-invariant, additive Gaussian noise channel and for M -phase signaling over an L diversity branch, Rayleigh fading, additive Gaussian noise channel. Both channels corrupt the signaling wavefor... View full abstract»

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  • Generation of Digital Signaling Waveforms

    Publication Year: 1968, Page(s):81 - 93
    Cited by:  Papers (20)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1339 KB)

    Data transmission (digital signaling) systems generally transmit continuous, essentially bandlimited signals that represent alphanumeric sequences. The transmitting apparatus in such systems must therefore convert discrete symbols-often binary pulses-into prescribed analog waveforms. Current commercial systems do this via simple filtering, gating, and conventional modulation. These practices limit... View full abstract»

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  • The Prevention of Transmission Buffer Overflow in Telemetry Data Compressors

    Publication Year: 1968, Page(s):94 - 107
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1485 KB)

    A comparative evaluation of several feedback methods of telemetry data compressor output buffer overflow prevention is described. The study was made using a digital computersimulated multichannel data compressor, operating on recorded Explorer XVII satellite telemetry data. The performances of control methods based on precompression digital filtering and sample deletion are evaluated and compared ... View full abstract»

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  • Correlative Data Transmission with Coherent Recovery Using Absolute Reference

    Publication Year: 1968, Page(s):108 - 115
    Cited by:  Papers (8)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    A new data-transmission method that has twice the speed capability of the duobinary technique over an identical bandpass transmission medium is presented. Advantages of this method include promising performance and completely digital manner of signal generation, thus considerably reducing the circuit complexity. The system is based on correlative techniques in which the digital encoding forms an i... View full abstract»

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  • A High-Performance Digital Data-Transmission System

    Publication Year: 1968, Page(s):115 - 119
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (531 KB)

    A family of practical data-transmission systems, whose design is motivated by a desire to reduce the required energy per bit (for a specified noise power density) while operating in a well-defined part of the frequency spectrum, is described. The blocks of j information bits that are periodically fed to the transmitter are encoded into equal energy waveforms ... View full abstract»

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  • Space DIversity on Line-of-Sight Microwave Systems

    Publication Year: 1968, Page(s):119 - 133
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2611 KB)

    Deep fading on line-of-sight microwave paths is usually a result of multipath interference phenomena. Frequency diversity has been the most common method of protecting against such fading. In the past few years, vertical space diversity has also come into use. This paper discusses its characteristics, methods of determining spacings, and describes some results achieved. It is concluded that vertic... View full abstract»

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  • Multiplex Telemetry Modulation and Demodulation Methods

    Publication Year: 1968, Page(s):133 - 141
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1041 KB)

    There are a wide variety of modulation methods among the recently used telemetry systems. Characteristics and capabilities of some of these methods are briefly described. There is no generally accepted "best" method. Requirements for conservation of radio spectrum have a strong influence on the choice of modulation parameters. New Inter-Range Instrumentation Group (IRIG) modulation standards have ... View full abstract»

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  • Construction and Performace of a PCM Frame Synchronizer with Self-Varying Threshold

    Publication Year: 1968, Page(s):142 - 148
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    In the decommutation of PCM data, synchronization is accomplished by the detection of a coded word located at a known position in the message frame. It is the detection of the code word that is of interest here. This may be accomplished in a more efficient manner with a synchronizer using a self-varying threshold. This device is interesting in that no manual setting by the operator is necessary, a... View full abstract»

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  • Companded Delta Modulation for Telephone Transmission

    Publication Year: 1968, Page(s):149 - 157
    Cited by:  Papers (25)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (866 KB)

    A new method of improving delta modulation with syllabic companding is presented. Companded delta modulation has a sort of syllabic companding function in its local decoder without depending on any nonlinear elements such as a variolosser. Analyses are made of the stationary companding law, dynamic response, overload characteristics, signal-to-noise ratio, overall transmission characteristics, etc... View full abstract»

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  • Companded Delta Modulation for Telephony

    Publication Year: 1968, Page(s):157 - 162
    Cited by:  Papers (23)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (610 KB)

    An experimental delta modulation system that appears to satisfy Bell System telephone requirements in the telephone plant environment is described. A significant improvement in signal-to-noise ratio over a large dynamic range has been achieved with a modification that is akin to syllabic companding. It consists in adapting the modulator quantizing step size to the signal level over part of the dyn... View full abstract»

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  • General Transmission Considerations in Telephone Conference Systems

    Publication Year: 1968, Page(s):163 - 167
    Cited by:  Papers (4)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (565 KB)

    A general discussion of the transmission problems involved in telephone conference systems due to noise, echo, and singing is presented. The application of voice switched loss seems to be the best way to alleviate these difficulties. New problems must now be considered due to weak talkers and occasional simultaneous talking. Two types of conference connections are discussed: First, when three or m... View full abstract»

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  • A Multiport Telephone Conference Bridge

    Publication Year: 1968, Page(s):168 - 172
    Cited by:  Papers (2)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (593 KB)

    Conference bridges allow a number of remotely located telephone subscribers to hold a conference. A new bridge using solid-state circuitry and a plug-in module-type equipment arrangement has been designed. The number of participants in a conference call varies. The capability and flexibility required have been achieved by designing a 30-port bridge that can be subdivided into five separate 6-port ... View full abstract»

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  • A Six-Channel Station Carrier System

    Publication Year: 1968, Page(s):172 - 184
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1233 KB)

    There is an increasing need for a low-cost, reliable station carrier system for use in the outside telephone plant. The system design constraints of cable attenuation, including bridge taps, cable crosstalk, switching noise, and remote power feed considerations are discussed. The particular design choices that have been made with respect to the modulation plan, carrier transmission levels, line im... View full abstract»

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  • Phase-Locked Loop Pull-In Range

    Publication Year: 1968, Page(s):184 - 186
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (285 KB)

    In this paper the derivation of a general equation for the pull-in range of a phase-locked loop is outlined. The equation is applied to a typical third-order loop, and algebraic results are derived in terms of the loop dc gain and network break frequencies. Expressions are given for the second-order terms which are usually neglected, so that an evaluation of the accuracy of results can be made. 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