By Topic

IEEE Transactions on Communications

Issue 2  Part 1 • February 1979

Filter Results

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

    Publication Year: 1979, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (320 KB)
    Freely Available from IEEE
  • Introduction

    Publication Year: 1979, Page(s):261 - 264
    Cited by:  Papers (1)
    Request permission for commercial reuse | PDF file iconPDF (540 KB)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back cover]

    Publication Year: 1979, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (227 KB)
    Freely Available from IEEE
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Monolithic Phase-Locked Loop with Post Detection Processor

    Publication Year: 1979, Page(s):413 - 419
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    This paper details the design and fabrication of a highfrequency (50-MHz) phase-locked loop with a post detection processor which allows the detection of FSK signals with few external components. The circuit operates with a single 5-V supply and has TTL compatible inputs and outputs. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Integrated Per-Channel PCM Encoder Based on Interpolation

    Publication Year: 1979, Page(s):272 - 278
    Cited by:  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    A novel technique called interpolation has been used to integrate a per-channel PCM encoder in a standard digital circuit technology. This encoder converts voiceband analog signals to both an oversampled 1-bit code and uniform PCM with μ-law companding noise. The circuit comprises approximately 550 integrated injection logic gates together with a resistive digital-to-analog converter, a volta... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Per-Channel LSI Codec for PCM Communications

    Publication Year: 1979, Page(s):265 - 271
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    An LSI codec for voiceband signals is presented. A modified counting-type encoding technique is employed to realize the codec, which uses coarse and fine reference current to discharge the integrating capacitor. The technique makes possible the realization of a high-speed counting-type codec for voice signals without imposing severe requirements on device parameters. This codec is composed of two ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Signal-to-Noise Ratio Statistics for Nondispersive Fading in Radio Channels with Cross Polarization Interference Cancellation

    Publication Year: 1979, Page(s):498 - 502
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The signal-to-noise ratio (SNR) statistics of a crosspolarized interference cancellation scheme is derived in terms of the statistics of nondispersive fading of the signals in the radio channels. The results are applied to certain digital radio channels subjected to nondispersive fading. It is found that error rates not exceeding 10-6could be maintained during 99 percent of the duration... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.

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