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IEEE Transactions on Communications

Issue 2  Part 1 • February 1979

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Displaying Results 1 - 25 of 42
  • [Front cover and table of contents]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • Introduction

    Publication Year: 1979, Page(s):261 - 264
    Cited by:  Papers (1)
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    Freely Available from IEEE
  • An Integrated Interpolative PCM Decoder

    Publication Year: 1979, Page(s):278 - 283
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (732 KB)

    The technique of time-averaging interpolation provides a means for obtaining telephone quality digital-to-analog conversion using conventional digital integrated-circuit processing. This approach has been adopted in a monolithic circuit that decodes the 8-kHz companded PCM commonly used in voiceband communication systems. The circuit, realized in a standard buried collector bipolar technology, con... View full abstract»

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  • An NMOS Telephone Codec for Transmission and Switching Applications

    Publication Year: 1979, Page(s):305 - 311
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (610 KB)

    This paper describes a monolithic high-feature per-channel companded PCM coder/decoder (codec) and implications of the advanced architecture for fixed and variable time-slot applications. Technology tradeoffs are identified, and implementation of the critical analog circuit functions inn-channel MOS technology is discussed. These circuits include the first commercial embodiment of a nov... View full abstract»

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  • A Single-Chip CMOS PCM Codec

    Publication Year: 1979, Page(s):312 - 317
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    A single-chip full duplex per channel PCM codec implemented in a metal gate CMOS process is presented. An 8-bit companding DAC, a novel autozeroed analog subsystem, and a 3.5-MHz frame interface control logic comprise the 175 × 195-mil integrated circuit. The DAC is implemented with matchedn-channel devices and utilizes redundancy and feedback to achieve the required accuracy. The ... View full abstract»

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  • A Single-Chip I2L PCM Codec

    Publication Year: 1979, Page(s):317 - 322
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (717 KB)

    A single-chip CPCM codec is described. This chip, which is fabricated in bipolar technology, meets all theD3specifications. The circuit is capable of operating in a fully asynchronous transmit and receive mode, and provisions are made, for zero-code suppression andA/Bsignaling. Even with this signaling, the codec achieves a worst case idle-channel noise of 13 dBrnC... View full abstract»

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  • The LT-1 Connector - A Conventional Transmultiplexer

    Publication Year: 1979, Page(s):355 - 360
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1172 KB)

    The LT-1 connector has been designed to provide an economical means of terminating analog transmission facilities on the No. 4ESS, a digital toll switching machine. It performs a bilateral conversion between two 12-channel analog group signals in the 60-108-kHz band and a 24-channel digital digroup at 1.544 Mbits/s. In addition, signaling information in the form of a 2600-Hz tone must be converted... View full abstract»

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  • Capacity Limits for Binary Codes in the Presence of Interference

    Publication Year: 1979, Page(s):441 - 448
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (733 KB)

    Capacity limits are obtained when binary codes are used for communications over channels in the presence of high levels of interference. The ideal additive Gaussian noise channel and the Rayleigh fading channel are considered. For each channel, the performance of four types of decoders are considered. Both binary and channel measurement (soft decision) decoding are considered; for each of these ca... View full abstract»

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  • The Covariance of Near End Crosstalk and Its Application to PCM System Engineering in Multipair Cable

    Publication Year: 1979, Page(s):469 - 477
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (675 KB)

    The near end crosstalk (NEXT) model proposed by Cravis and Crater [1] is analyzed to give the covariance of NEXT, with good agreement between theory and measurements on multipair cable. The covariance of NEXT is then used to estimate the variance of the meansquare NEXT interference between PCM systems operating under the same cable sheath. These results are used to derive the required minimum mean... View full abstract»

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  • A Class of Distribution-Free Detectors for Pulse Amplitude Modulated Signals

    Publication Year: 1979, Page(s):478 - 482
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A class of distribution-free detectors forM-ary pulse amplitude modulated digital signals in the presence of certain signal dependent interference and additive noise of unknown distribution is formulated, evaluated in terms of probability of error and compared to a matched filter detector in Gaussian noise. The noise distribution is unknown except that it satisfies certain broad assumpt... View full abstract»

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  • Simulation and Analysis of the Weighted Erasure Decoding

    Publication Year: 1979, Page(s):483 - 488
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (450 KB)

    A decoding scheme calledw-distance decoding (or weighted erasure decoding) has been studied for decoding binary block codes onQ-ary output channels by computer simulation and analytic derivation of the probabiliiy of error bound. Optimum distribution ofw-weights and the optimum threshold level of quantization are obtained by both simulation and minimization of the ... View full abstract»

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  • Improvements in Block-Retransmission Schemes

    Publication Year: 1979, Page(s):524 - 532
    Cited by:  Papers (38)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (838 KB)

    Consider the case where ann-digit block encoded word cannot be decoded reliably and a second block ofnredundant digits is sent to allow the receiver to make a new try based on the combined information received. Two classes of schemes are proposed and analyzed which give significantly better performance than is obtained by sending a repeat of the first block, yet do not requir... View full abstract»

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  • [Back cover]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • Measured Performance of a Laser Intensity Subcarrier Phase Shift Keyed Direct Detection Optical Communication System

    Publication Year: 1979, Page(s):522 - 524
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The performance of both optimal and much simpler suboptimal direct detection optical communication receiver structures was directly measured and found to be nearly identical for laser intensity subcarrier PSK communication through both free space and atmospheric (log-normal fading) channels. View full abstract»

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  • A Partial Response Binary Communication System with Erasure

    Publication Year: 1979, Page(s):493 - 498
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Formulas for probability of error (Pe) and probability of erasure (Po) for a binary communication system with partial response signals (duobinary, dicode, modified duobinary) and either decision feedback or precoding are presented.The input data are binary,but the output data are ternary where the third symbol represents erasure.The system with decision feedback is not improv... View full abstract»

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  • Antialiasing Filter with an Improved S/N Ratio

    Publication Year: 1979, Page(s):430 - 431
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    If a CCD low-pass filter is used for antialiasing, a higher data rate is necessary at the input compared to the output. This difference in the data rate is used to increase the signal-to-noise ratio. By adding a given number of consecutive charge packets at the output stage, the output data rate can be reduced until the Nyquist theorem for the output signal is violated. By summing up those charge ... View full abstract»

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  • Optical Switching System Experiment

    Publication Year: 1979, Page(s):517 - 521
    Cited by:  Papers (3)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    The construction and experimental results of a tiny optical video switching system are described. It had a 4 × 3 switch network composed of seventeen 1 × 2 type meehanical optical fiber switches whose average loss was 2.6 dB. Network insertion loss was about 20 dB. Insertion loss cause, signaling method and improvement for practical use are discussed. View full abstract»

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  • Integrated PCM Codec

    Publication Year: 1979, Page(s):296 - 304
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A one-chip PCM codec circuit has been implemented in the CMOS process. The design uses two separate linear digital-digital-to-analog converters, made with charge redistribution techniques. Experimental results show the circuit to meet accepted requirements and operate with very low power requirements. View full abstract»

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  • Optimal Blocklengths for ARQ Error Control Schemes

    Publication Year: 1979, Page(s):488 - 493
    Cited by:  Papers (42)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    Optimal blocklengths are investigated for various ARQ schemes used for error control in data transmission systems in independent-bit-error and Poisson-distributed block-error channels. A number of results relating to optimum block length for various ARQ schemes are collected for easy reference. New results are obtained for some of these schemes. The product of this investigation is suggested proce... View full abstract»

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  • Orthogonal and Quasi-Orthogonal Tree Codes with Applications to Multiple Access

    Publication Year: 1979, Page(s):449 - 460
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (928 KB)

    The performance of orthogonal and quasi-orthogonal tree codes is considered for incoherent and coherent systems. In addition, several alternative receiver structures using hard quantizing and "greatest-of" detection are treated. Upper bounds on error probability are derived and are used as a basis for system comparison. An application of quasi-orthogonal tree codes to a multiple access environment... View full abstract»

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  • The Vector Space Formulation of the Rain Crosspolarization Problem and Its Compensations

    Publication Year: 1979, Page(s):502 - 509
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The rain crosspolarization problem is formulated in a vector space. In this formulation signals are vectors, and the crosspolarization effect is an operator. The compensators currently designed for satellite communications become the inverse operator approach in this formulation. A new approach using eigenvectors is developed. The result indicates that use of two orthogonal linear polarizations an... View full abstract»

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  • Control of Satellite-Packet Switched Telecommunications Networks

    Publication Year: 1979, Page(s):438 - 440
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    This paper discusses the results of an investigation of control techniques for packet switching networks utilizing satellite transmission under stressed conditions. Emphasis is placed on controlling TDM satellite networks to enhance traffic carrying capacity and maintain performance under stressed conditions. View full abstract»

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  • Multiple-Tone Detector with CCD Filters

    Publication Year: 1979, Page(s):349 - 354
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (984 KB)

    An integrated-circuit multiple-tone detector is demonstrated. It is made of three transversal CCD filters with nonoverlaping bandpass characteristics for tone (i.e., sine wave signal) separation and each filter has an internally matched threshold level for reproducible tone detection. When an in-band tone exceeds the threshold level, the output for that particular filter is a square wave with the ... View full abstract»

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  • A Sampled Analog MOS LSI Adaptive Filter

    Publication Year: 1979, Page(s):406 - 412
    Cited by:  Papers (1)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    A novel realization of an adaptive filter using sampled analog MOS LSI techniques is described in this paper. The basic functional block of the adaptive filter is an electrically programmable transversal filter whose tap weights are modified according to the least mean square algorithm. A comparison has been made among different available approaches for implementing a programmable transversal filt... View full abstract»

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  • An MOS Digitally Controlled Analog Attenuator for Voiceband Signals

    Publication Year: 1979, Page(s):332 - 337
    Cited by:  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    This paper describes the design of an analog attenuator integrated circuit having loss settings that can be determined by remote digital control. The circuit uses a weighted MOS capacitor array to effect losses of 0-16.5 dB in steps of 0.1 dB. Each loss setting is accurate to ± 0.02dB. Two approaches to the circuit realization are described: a CMOS version that includes a digital memory to pe... 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