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IEEE Transactions on Communication Technology

Issue 5  Part 1 • Date October 1971

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Displaying Results 1 - 25 of 45
  • [Front cover and table of contents]

    Publication Year: 1971, Page(s): 0
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    Freely Available from IEEE
  • Functional Specification of Call Processing by State Transition Diagram

    Publication Year: 1971, Page(s):581 - 587
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (650 KB)

    Functional specification of call processing in a telephone switching system became more complicated with the progress of common control systems, especially of stored program controlled electronic switching systems, which enabled the introduction of new service features. One approach by state transition diagram that is now widely adopted in Japan is explained and discussed. Since a telephone switch... View full abstract»

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  • Multifrequency (MF) Tone-Generating System for a Pulse-Code-Modulation (PCM) Digital Exchange

    Publication Year: 1971, Page(s):588 - 596
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (799 KB)

    A digital multifrequency (MF) tone-generating system for a pulse-code-modulation (PCM) time-division multiplexed (TDM) exchange has been developed as well as the tone injection system necessary for outpulsing desired tone information in a TDM network. The tone pair is generated by reading in a predetermined sequence a memory store that contains a few binary words representing a presynthesized wave... View full abstract»

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  • Sorting and Rearrangeable Switching Networks

    Publication Year: 1971, Page(s):596 - 600
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Some rearrangeable switching networks are developed by considering some familiar sorting procedures. The basic switching element in these networks is a two-state device (essentially a doublepole double-throw (DPDT) switch) that can be controlled by a comparator circuit in most cases. The complexity of the networks is discussed in terms of the number of these two-state devices and the number of sta... View full abstract»

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  • Subjective Evaluation of Pre- and Postfiltering in PAM, PCM, and DPCM Voice Communication Systems

    Publication Year: 1971, Page(s):601 - 612
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1126 KB)

    In a recent paper [1] the authors obtained the pre- and postfilters that minimize the mean-square error between the message x(t) and its received replica \hat{x}(t) under very general conditions on both x(t) and the communication system under consideration. The present work compare... View full abstract»

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  • Inclusion of the Time Factor in Comparing the Costs of Terrestrial Telecommunication Transmission Systems

    Publication Year: 1971, Page(s):612 - 618
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (621 KB)

    The traditional figure of merit in comparing the economics of telecommunication transmission systems has been the annual cost per voice-circuit mile at full capacity. While this is a useful measure in some types of comparisons, it does not provide a particularly meaningful measure of the costs borne by the users of a transmission system. The users are expected to pay the average costs. The average... View full abstract»

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  • The Application of Information Feedback to an Amplitude-Modulated Laser Communications System

    Publication Year: 1971, Page(s):618 - 627
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (773 KB)

    The application of information feedback to amplitudemodulated (AM) laser communication systems used to transmit the value, of a continuous parameter is considered. The laser system is assumed to be quantum-noise limited. The particular information feedback technique used is here termed feedback averaging. It is found that the use of this technique improves the accuracy of the estimate of the param... View full abstract»

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  • Data Transmission by Frequency-Division Multiplexing Using the Discrete Fourier Transform

    Publication Year: 1971, Page(s):628 - 634
    Cited by:  Papers (1097)  |  Patents (172)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (621 KB)

    The Fourier transform data communication system is a realization of frequency-division multiplexing (FDM) in which discrete Fourier transforms are computed as part of the modulation and demodulation processes. In addition to eliminating the bunks of subcarrier oscillators and coherent demodulators usually required in FDM systems, a completely digital implementation can be built around a special-pu... View full abstract»

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  • Eye Pattern for the Binary Noncoherent Receiver

    Publication Year: 1971, Page(s):634 - 643
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (870 KB)

    The assessment of imperfect channels in data transmission usually involves noise considerations. Channel imperfections are related to system performance by determining the increase in carrier-to-noise ratio required to maintain a fixed error rate. The impairment is determined by examining the "eye" pattern, which shows the effective reduction in signal amplitude caused by intersymbol interference.... View full abstract»

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  • A Communications Detector With a Signal-Synthesized Reference

    Publication Year: 1971, Page(s):643 - 648
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (562 KB)

    A detector in which the reference is derived from the incoming signal by a form of waveform synthesis utilizing positive feedback is capable of demodulating a variety of types of transmission, including single-sideband and double-sideband (carrierless) waves. With single-sideband transmissions the system permits the detection of weak signals without the problem of stray pickup from the reference o... View full abstract»

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  • Transmitter-Receiver Optimization for Active Signaling over Undersea Acoustic Channels

    Publication Year: 1971, Page(s):649 - 659
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    A performance coefficient corresponding to an extended form of the signal-to-noise ratio at the output of an estimatorcorrelator detector is introduced and discussed. A suboptimum approach is then considered to the detection of signals transmitted through a purely random channel and corrupted by additive Gaussian noise, with arbitrary signal-to-noise ratios at the channel output. An estimator-corr... View full abstract»

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  • Modem Performance in VLF Atmospheric Noise

    Publication Year: 1971, Page(s):659 - 668
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (772 KB)

    An atmospheric noise model for analyzing the performance of modulation/demodulation systems operating at VLF frequencies is presented. Performance analyses of various modems based on this noise model are compared with experimental measurements. Theoretical and experimental results are categorized by long integration time, short integration time, and nonlinear IF processing. View full abstract»

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  • A Multifilter Phase-Lock Loop

    Publication Year: 1971, Page(s):669 - 675
    Cited by:  Papers (2)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    The phase model for the generalized multifilter phaselock loop (M PLL) is considered and state equations for this model are derived. A linear analysis is presented to aid in the preliminary design of an M PLL and to indicate the noise improvement over a conventional phase-lock loop (PLL). Performance characteristics are examined for an M PLL with low-pass and bandpass characteristics used in a spe... View full abstract»

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  • EQUOPT: Computer-Aided Wide-Band Equalization of Telephone Lines

    Publication Year: 1971, Page(s):676 - 682
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (575 KB)

    A computer-aided optimization method for wide-band equalization of telephone pairs is presented. The method was developed specifically for the automatic design of networks, whose principal aim is to minimize the mean-square error (MSE) of the deviations from flat response. The program accepts a set of loss values either measured or computed from the distributed parameters and finds, by an original... View full abstract»

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  • Signal Generator and Distortion Detector for Program Circuits

    Publication Year: 1971, Page(s):682 - 686
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    The need to improve transmission through routine testing of program circuits for the effect of nonlinear distortion has long been recognized. Equipment has been developed for making such an evaluation on a "one-shot" basis, consistent with standards set up by the Video Transmission Engineering Advisory Committee (VITEAC) and Bell Telephone Laboratories. This equipment is a pair of special purpose ... View full abstract»

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  • Long-Subscriber-Route Planning and Design

    Publication Year: 1971, Page(s):687 - 692
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (651 KB)

    Although long rural routes comprise less than 2 percent of the total Bell System loop plant, they pose serious transmission and economic problems. Planning for adequate transmission and lowest costs is facilitated by a new voice-frequency electronics plus cable design procedure that provides for an 8-dB EML and a 15-20 percent cost saving over conventional resistance design. Additional cost saving... View full abstract»

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  • A Recording and Processing System for Accounting and Traffic Analysis on a Large PABX

    Publication Year: 1971, Page(s):692 - 699
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (743 KB)

    A new facility for recording and subsequent computer processing of telephone calls has been developed at the Technical University of Norway. The equipment is intended for connection to a PABX of conventional electromechanical design. It is fully electronic and is based on cyclic scanning of up to 128 trunk-line circuits. The recording medium is digital magnetic tape and data are collected, arrange... View full abstract»

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  • The Error Probability of a Wide-Band FSK Receiver in the Presence of Multipath Fading

    Publication Year: 1971, Page(s):699 - 707
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (710 KB)

    Calculations are made for the probability of error of a wide-band FSK receiver of the type used in space telemetry when multipath reflections off the planetary surface cause signal fading. The error probability is found for both low and high fading bandwidths and for small or large reflected path delays. View full abstract»

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  • Optimum Reception of Coded Multiple Frequency Keying in Presence of Random Variable Phases

    Publication Year: 1971, Page(s):707 - 711
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (550 KB)

    Wide-band multiple frequency-shift keying is perturbed by random phases in the M \geq 2 frequency slots. We consider a coded digital system, where the M phases can be treated as mutually dependent random variables. If their joint distribution is known, the optimum (maximum-likelihood) receiver is shown to be in general ver... View full abstract»

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  • The Probability Density Function for Correlators With Correlated Noisy Reference Inputs

    Publication Year: 1971, Page(s):711 - 714
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    A general expression for the probability density function of the output of a correlator has been obtained and plotted using a low-pass multiplier analogy. Each of the two input channels of the correlator has a specular signal in the presence of bandlimited Gaussian noise. In the general case considered here, the noise components in the two input channels are permitted to have in-phase correlation.... View full abstract»

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  • Improving DCPSK Transmission by Means of Error Control

    Publication Year: 1971, Page(s):715 - 719
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (509 KB)

    In this paper, the output of a differentially coherent detector using the phase of the k th previous bit as a reference is derived under noise free conditions for binary differential phase shift keyed signals, where k = 1, 2, 3 ... or ally integer. This is then related to the output of a conventional differentially coher... View full abstract»

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  • Decoder for Delay-Modulation Coded Data

    Publication Year: 1971, Page(s):719 - 723
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    "Delay modulation," originally developed in conjunction with high density digital (saturation) tape recoding, combines the advantages of narrow bandwidth of pulse-code modulation (PCM) nonreturn to zero (NRZ) and the advantages of self-timing information inherent in phase modulation. This paper describes a decoding technique for the conversion of delay-modulated digital data to NRZ View full abstract»

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  • Interference in Angle-Modulated Systems With Predetection Filtering

    Publication Year: 1971, Page(s):723 - 726
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (423 KB)

    An approximate expression is derived for the output power spectral density in the baseband of an angle-modulated signal interfered with by another such signal when the receiver includes a linear bandpass filter. The expression assumes that the filter negligibly affects the desired signal and that the interference is small. View full abstract»

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  • 70-MHz Solid-State Frequency Modulator

    Publication Year: 1971, Page(s):727 - 729
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (341 KB)

    This report describes the development of a wide-band frequency-modulated oscillator with the following design goals: 1) direct modulation at a center frequency of 70 MHz; 2) instantaneous frequency deviation-±10 MHz; 3) linearity-within ±1 percent to ±10 MHz; 4) deviation rate (baseband response)-±0.5 dB from 100 Hz to 10 MHz; 5) provision for automatic frequency control. View full abstract»

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  • Sideband-Operated Automatic Frequency Control for Reception of Suppressed-Carrier SSB Voice Signals

    Publication Year: 1971, Page(s):729 - 733
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (599 KB)

    It is suggested that frequency errors in the reinserted carrier in SSB voice reception, such as result from doppler shift of the incoming signal or oscillator drift, may be corrected by an AFC arrangement utilizing the sidebands themselves. The technique depends on the fact that the loudest speech sounds are rich in harmonics of the vibration rate of the vocal cords. This harmonic spectrum can be ... 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