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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  • 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
  • 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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  • A New Family of Low-Delay FM Detectors

    Publication Year: 1979, Page(s):419 - 429
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    This paper describes a new family of FM detectors having extremely low delay with excellent sensitivity. It is achieved by the use of zero group delay circuits, balance at RF, quasi-synchronous detection, and carrier cancellation. The components are compatible with integrated-circuit technology. The performance of the detectors is analyzed for both narrow- and wide-band modulation conditions indic... 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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  • 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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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