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IEEE Transactions on Communications

Issue 2  Part 1 • Date 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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  • Introduction

    Publication Year: 1979, Page(s):261 - 264
    Cited by:  Papers (1)
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    Freely Available from IEEE
  • 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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  • [Back cover]

    Publication Year: 1979, Page(s): 0
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    Freely Available from IEEE
  • 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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  • 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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  • A Per-Channel LSI Codec for PCM Communications

    Publication Year: 1979, Page(s):265 - 271
    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»

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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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  • 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»

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  • Integrated DTMF Receiver

    Publication Year: 1979, Page(s):343 - 348
    Cited by:  Papers (7)  |  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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  • Charge-Coupled Device (CCD) Adaptive Discrete Analog Signal Processing

    Publication Year: 1979, Page(s):390 - 405
    Cited by:  Papers (3)
    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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  • A Single-Chip CMOS PCM Codec

    Publication Year: 1979, Page(s):312 - 317
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 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 matched n -channel devices and utilizes redundancy and feedback to achieve... View full abstract»

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  • Optical Switching System Experiment

    Publication Year: 1979, Page(s):517 - 521
    Cited by:  Papers (1)  |  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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  • 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»

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  • Simulation and Analysis of the Weighted Erasure Decoding

    Publication Year: 1979, Page(s):483 - 488
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A decoding scheme called w -distance decoding (or weighted erasure decoding) has been studied for decoding binary block codes on Q -ary output channels by computer simulation and analytic derivation of the probabiliiy of error bound. Optimum distribution of w -weights and the optimum t... View full abstract»

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  • Optimal Blocklengths for ARQ Error Control Schemes

    Publication Year: 1979, Page(s):488 - 493
    Cited by:  Papers (33)  |  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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  • 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 (7)
    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»

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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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  • 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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  • 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 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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  • 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 (744 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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  • 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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  • 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 (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 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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  • 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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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