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Communications, IEEE Transactions on

Issue 1 • Date January 1980

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Displaying Results 1 - 25 of 26
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Comments on and Extensions on Wolf's Signal-to-Channel Noise Formulas for Delta-Modulated Systems

    Publication Year: 1980, Page(s):131 - 135
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (397 KB)

    The channel noise effects on linear delta modulation (LDM) systems have not yet been adequately analyzed. This paper presents a new and general formulation of these effects, based on the theoretical work by Wolf [1]. A comparative discussion of our formulas with previous results is also included. Finally, the application of our methods and the validity of our comments are illustrated by some numer... View full abstract»

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  • Comments on "Binary CPSK Performance Analysis for Saturating Band-Limited Channels"

    Publication Year: 1980, Page(s): 139
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB)

    This correspondence is to point out an error that appeared in the paper (ibid., vol. COM-27, pp. 596-603, Mar. 1979), which claims that the expression of eq. (2) is the first zonal output signal of the piece-wise linear limiter. However, the performance analysis and curves are still valid for the types of soft limiters whose first zonal characteristic is described by eq. (2) of the paper. View full abstract»

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  • Author's reply

    Publication Year: 1980, Page(s): 139
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • Traffic Assistance Service System for ESS

    Publication Year: 1980, Page(s):117 - 122
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    This paper describes the traffic assistance service system that has been developed as a standard operator position system applicable to ESS and is employed in a variety of NEC's telephone switching systems. To provide services of various kinds of semiautomatic calls, it is important that operator position system is not only a cost-saving system but also has a wide range of flexibility. For this re... View full abstract»

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  • Delta Modulators in Packet Voice Networks

    Publication Year: 1980, Page(s):33 - 51
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1536 KB)

    In this paper, the performances of the Song Voice Adaptive Delta Modulator (SVADM) and the Continuously Variable Slope Delta Modulator (CVSD) in terms of dynamic range, sampling rate and the channel errors are compared. The use of the SVADM and the CVSD in a packet voice system, the algorithms for digital detection of silent periods and the performance of a packet voice system using the SVADM and ... View full abstract»

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  • An Improved Phase Modulator with Low Nonlinear Distortion

    Publication Year: 1980, Page(s):111 - 115
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A phase modulator with good phase linearity over an extended range of inputs is described. Performance results in terms of signal-to-distortion ratio are given. View full abstract»

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  • Digital Transmission of Commentary-Grade (7 KHz) Audio at 56 or 64 Kbits/s

    Publication Year: 1980, Page(s):136 - 138
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    A two-band coding system has been constructed for the purpose of providing commentary grade (7 kHz bandwidth) speech or music transmission at 56 or 64 kbits/s. The lower band, 0-to-3650 Hz, is coded with 4 bit ADPCM and the upper band, 3600-to-6800 Hz, is coded with 3 bit or 4 bit/sample APCM. The quality of the coded signal makes the method useful for news and sports broadcasts, and possibly for ... View full abstract»

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  • Computing the Waiting Time Distribution for the G/G/1 Queue by Signal Processing Methods

    Publication Year: 1980, Page(s):52 - 58
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Two methods, based on signal processing techniques, are presented for obtaining numerical solutions for the general single server queue with first-come, first-served discipline. The first method is based on the use of the fast Fourier transform (FFT) for producing iterative solutions to a discrete version of Lindley's integral equation for both nonsteady state and equilibrium conditions. The secon... View full abstract»

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  • The Analysis of a Statistical Multiplexer with Nonindependent Arrivals and Errors

    Publication Year: 1980, Page(s):65 - 72
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    Most stochastic models for discrete time statistical multiplexers make the assumption that 1) arrivals are governed by a Bernoulli process and that 2) transmission errors or multiplexer failures are described by an independent error process. We study a multiplexer operating in a two state Markovian environment in which each state is characterized by its own Bernoulli arrival process and independen... View full abstract»

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  • Effects of Intersymbol Interference on a Rayleigh Fast-Fading Channel

    Publication Year: 1980, Page(s):128 - 131
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    It is shown in this paper that the performance of certain Rayleigh fast-fading channels can be accurately and efficiently evaluated using the elementary trapezoidal integration rule. The effects of intersymbol interference on such channels are analyzed. View full abstract»

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  • A Microprocessor Based High Speed Space-Borne Packet Switch

    Publication Year: 1980, Page(s):7 - 21
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1120 KB)

    The design and performance evaluation of a single microprocessor based packet switch for use on-board a satellite are presented. The primary design criterion is to maximize the system throughput. A number of protocols and their impact on the switch design are discussed. System and processor hardware architectures are described. The flow charts of the software required to accomplish the essential f... View full abstract»

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  • A Study of the Comparative Performance of Adaptive Delta Modulation Systems

    Publication Year: 1980, Page(s):96 - 101
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    A performance comparison of three representative ADM systems has been made by computer simulation using real speech. The three systems studied are continuously variable slope delta modulation (CVSD), Jayant's constant factor delta modulation (CFDM), and a modified version of Un and Magill's hybrid companding delta modulation (HCDM). Among the three systems, HCDM yields the best performance in sign... View full abstract»

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  • Equivalent Low-Pass Representations for Bandpass Volterra Systems

    Publication Year: 1980, Page(s):140 - 142
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Relationships are derived for finding equivalent low-pass representations of the Volterra kernels corresponding to a widely used model for a nonlinear communication channel. The results are a logical extension of the usual complex envelope representation for bandpass signals. The equivalent low-pass representations are useful for simplifying calculations in cases where the input and output signals... View full abstract»

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  • Buffer Behavior for Mixed Arrivals and Single Server with Random Interruptions

    Publication Year: 1980, Page(s):59 - 64
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    A queueing model with finite buffer size, mixed input traffic (Poisson and burst Poisson arrivals), synchronous transmission and server interruptions through a Bernoulli sequence of independent random variables is studied. Using average burst length, traffic intensity and input traffic mixture ratio as parameters, the relationships among buffer size, overflow probability and expected message queue... View full abstract»

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  • An Algorithm for Vector Quantizer Design

    Publication Year: 1980, Page(s):84 - 95
    Cited by:  Papers (2838)  |  Patents (263)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    An efficient and intuitive algorithm is presented for the design of vector quantizers based either on a known probabilistic model or on a long training sequence of data. The basic properties of the algorithm are discussed and demonstrated by examples. Quite general distortion measures and long blocklengths are allowed, as exemplified by the design of parameter vector quantizers of ten-dimensional ... View full abstract»

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  • Blocking Probabilities for a Class of Spiderweb Channel Graphs

    Publication Year: 1980, Page(s):115 - 117
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The blocking probabilities for spiderweb channel graphs are well known to be difficult to compute. Recently, Takagi studied a class of spiderweb channel graphs and gave recursive equations for computing their blocking probabilities. In this paper we use a recent result in combinatorics to give a dosed form solution for the recursive equations. Consequently, the blocking probability for any graph i... View full abstract»

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  • An A/D Converter with 10 Bits/Sample by 20 MHz Sampling Rate

    Publication Year: 1980, Page(s):1 - 6
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    An A/D converter circuit system with a very high bit-rate has been developed. It is a series-parallel type, and the input of the last A/D stage is equivalently ac-coupled. This can be allowed by the statistical charactertstics of input signals. A prototype of this A/D converter has the following characteristics: 1) dc coupled analog input-able to accept almost all analog signals as well as televis... View full abstract»

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  • Future Local Telephone Network Configurations

    Publication Year: 1980, Page(s):102 - 111
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    This paper presents the concept of dividing a local office service area under the present telephone network into blocks of switching areas to make up a local network with small, distributed switching nodes because switching costs will become much cheaper relative to cable laying costs due to LSI technology progress. In this paper, cable laying cost and switching cost are taken as the two main fact... View full abstract»

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  • A Note on the Generation of Phase Plane Plots on a Digital Computer

    Publication Year: 1980, Page(s):144 - 149
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A technique is presented for generating phase plane plots on a digital computer which circumvents the difficulties associated with more traditional methods of numerical solving nonlinear differential equations. In particular, the nonlinear differential equation of operation is formulated as a pair of coupled differential equations with phase error and phase error derivative as dependent variables ... View full abstract»

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  • An Algorithm for Computing Average Loss Probability in a Circuit-Switched Communication Network

    Publication Year: 1980, Page(s):27 - 33
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    This paper describes an algorithm for estimating loss probability in a circuit-switched network. The estimate obtained by the algorithm is also compared with an estimate obtained through simulation. View full abstract»

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  • An Analysis of Automatic Equalizers for Orthogonally Multiplexed QAM Systems

    Publication Year: 1980, Page(s):73 - 83
    Cited by:  Papers (51)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    A simple structure of a per-channel automatic equalizer for an orthogonally multiplexed QAM system is proposed and the performance is analyzed. It is shown that a dual automatic equalizer with T/2 -long tapped delay lines, where T is a period of individual baseband baud, can equalize not only the transmission channel disto... View full abstract»

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  • Coupled AGC-Costas Loops with AM/PM Conversion

    Publication Year: 1980, Page(s):122 - 127
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Costas loops are invariably designed in conjunction with an automatic gain control (AGC) loop for stabilizing performance. In such systems an inherent coupling between the AGC and Costas loops develops, complicating the standard phase referencing analysis. This coupling is further emphasized if the gain control amplifier introduces an AM/PM conversion, which causes power variations to enter the Co... View full abstract»

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  • A New Method for the Demodulation of FM Signals

    Publication Year: 1980, Page(s):142 - 144
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A novel time-domain semidigital approach for frequency demodulation is described. This conceptually simple method, utilizing a couple of engineering approximations, has excellent linearity for small frequency deviation, an undeteriorating sensitivity even for very small frequency deviation, is self-timed and is highly suitable for circuit integration; however, with the present day circuit technolo... 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