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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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  • 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
  • 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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  • Charge-Coupled Device (CCD) Adaptive Discrete Analog Signal Processing

    Publication Year: 1979, Page(s):390 - 405
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1704 KB)

    A CCD adaptive signal processor is described which uses a so-called "clipped-data" least mean square (LMS) error algorithm to optimize the selection of tap weights in a CCD filter. A detailed description of a 16-tap monolithic silicon CCD analog adaptive filter is also presented. The filter is comprised of a basic linear combiner formed with a nondestructively tapped CCD analog delay line and elec... View full abstract»

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  • Integrated DTMF Receiver

    Publication Year: 1979, Page(s):343 - 348
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A single integrated-circuit receiver for telephone systems is described. A new detection algorithm allows for the proper detection of tones with exceptional insensitivity to speech. 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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  • Key Aspects in the Development of a 48-Channel Duobinary PCM Repeater

    Publication Year: 1979, Page(s):379 - 389
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1368 KB)

    This paper describes the background and the actual circuit designs in the development of the 48-channel modified duobinary PCM line repeater. The reasons for the choice of the modified duobinary coding technique are explained. The equalization requirement of the signal in terms of the channel roll-off factor is obtained by considering the crosstalk penalty, intersymbol interference, and ease of ha... View full abstract»

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  • Double-Split-Electrode Transversal Filter for Telecommunication Applications

    Publication Year: 1979, Page(s):338 - 342
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    A novel structure for on-chip tap weight implementation in CCD transversal filters is described. The new approach employs two splits in the CCD sensing electrodes to improve on the performance of the conventional single-split weighting technique. It is shown that the new approach greatly reduces the capacitance associated with the sensing nodes and consequently reduces the common-mode signal, gain... View full abstract»

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  • A Single-Channel PCM Codec

    Publication Year: 1979, Page(s):283 - 295
    Cited by:  Papers (5)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1720 KB)

    A single-channel PCM codec is described which is being manufactured for use in the new British Post Office (BPO) range of digital PABX's. The codec works on the principle of converting to and from PCM using an intermediate delta-sigma modulation code format. This technique allows relatively simple analog circuitry to be used in conjunction with a digital LSI chip to perform the conversion between ... 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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  • A Decision-Directed Carrier Recovery Loop for Duobinary Encoded Offset QPSK Signals

    Publication Year: 1979, Page(s):461 - 468
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    The Canadian RD-3 digital radio system will utilize duobinary encoded, offset QPSK modulated signals. This complex signal structure is such that a conventional fourth order nonlinearity and phase-locked loop cannot be used for carrier recovery. In this paper, a decision-directed phase-lock loop is proposed for carrier recovery and demodulation of these signals. The equations describing loop operat... View full abstract»

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  • Design of an Integrated Circuit for the T1C Low-Power Line Repeater

    Publication Year: 1979, Page(s):367 - 378
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1208 KB)

    A low-power T1C (3.152-Mbits/s) digital repeater has been designed which reduces the power requirements by a factor of approximately four compared to the previous version. The new design operates at 60 mA and 6.2 V, or 372 mW, a power level essentially identical to new T1 repeater designs which run at one-half the T1C rate. As a result, the maximum distance between powering stations has been incre... 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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  • A PCM Voice Codec with On-Chip Filters

    Publication Year: 1979, Page(s):323 - 331
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1192 KB)

    A monolithic NMOS coder/decoder (codec) with associated CCD transversal minimum-phase filters has been successfully implemented. The codec operates by charge redistribution in a binaryweighted capacitor array, with a resistor chain to define individual steps. The experimental performance compares well with PCM codecs implemented with discrete components. 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