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

    Publication Year: 1979, Page(s):478 - 482
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A class of distribution-free detectors for M -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 sat... 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 (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 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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  • 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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  • 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 (624 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 in n -channel MOS technology is discussed. These circuits include the first co... 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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  • 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»

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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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  • 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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  • 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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  • 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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  • Optimal Structures of Benes' Switching Networks

    Publication Year: 1979, Page(s):433 - 437
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The class of switching networks, composed of stages of identical square switches arranged symmetrically around a center stage (Benes' networks), is considered. The synthesis problem of selecting from this class a rearrangeable network with the minimum number of crosspoints is solved. Benes' approach, (using relation of covering), is taken into consideration. The new structures of the networks are ... 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 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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  • 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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  • 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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  • 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 (848 KB)

    Consider the case where an n -digit block encoded word cannot be decoded reliably and a second block of n redundant 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 b... 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 (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»

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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 (728 KB)

    A single-chip CPCM codec is described. This chip, which is fabricated in bipolar technology, meets all the D3 specifications. The circuit is capable of operating in a fully asynchronous transmit and receive mode, and provisions are made, for zero-code suppression and A/B signaling. Even with this signaling, the codec a... 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 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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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