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IEEE Transactions on Communications

Issue 6 • Date June 1980

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Displaying Results 1 - 22 of 22
  • [Front cover and table of contents]

    Publication Year: 1980, Page(s): 0
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    Freely Available from IEEE
  • An Analysis of a Real-Time Transform Domain Filtering Digital Communication System - Part I: Narrow-Band Interference Rejection

    Publication Year: 1980, Page(s):816 - 824
    Cited by:  Papers (86)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (732 KB)

    This paper provides a detailed analysis of the performance of systems recently proposed by various authors in which the received signal is Fourier transformed in real time (usually with a surface acoustic wave device) and then filtered by a multiplication of the transformed signal by an appropriate transfer function. We shall refer to this operation as transform domain filtering. General expressio... View full abstract»

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  • Comments on "Calculation of Some Functions Arising in Problems of Queueing and Communications Traffic"

    Publication Year: 1980, Page(s):906 - 907
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (199 KB)

    In this brief correspondence it is argued that Rappaport's formulas which were developed to calculate the inverse of blocking probability for Erlang loss and Erlang delay systems should be revised. These formulas can readily be solved by taking advantage of the monotonic property of overflow traffic as suggested earlier in the literature. View full abstract»

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  • Author's reply

    Publication Year: 1980, Page(s):907 - 908
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    First Page of the Article
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  • Digital Encoding of Phase Shift Keying Voiceband Data Signals

    Publication Year: 1980, Page(s):831 - 840
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (928 KB)

    Computer simulation was used to evaluate the performance of eleven coder/decoders (CODEC's) with phase shift keying (PSK) and differential PSK(DPSK) voiceband data signals. The CODEC's were PCM, differential PCM and delta modulation systems designed for speech and operating at bit rates from 16 to 64 kbits/s. The voiceband data signals processed by these CODEC's were demodulated to determine the p... View full abstract»

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  • Speech Encoding by a Stack Algorithm

    Publication Year: 1980, Page(s):825 - 830
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    A metric-first tree coding algorithm, similar to the stack algorithm, is used to encode voiced speech. From experimental evidence, it is shown how to optimize the algorithm's performance with respect to the algorithm's storage, execution time, and number of tree branches searched per symbol released as output. For each of these, the optimal parameterizing of the algorithm differs markedly. Similar... View full abstract»

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  • Spatial Properties of Meteor-Burst Propagation

    Publication Year: 1980, Page(s):841 - 849
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1104 KB)

    The experiments described in this paper were carried out to determine the probability of simultaneous reception of meteor-burst signals at different geographic locations (interception) so that the possibility of interference and frequency sharing as well as the suitability of this type propagation to broadcasting may be assessed. Interception tests were conducted at five different sites using tran... View full abstract»

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  • Voice/Data Integration Using Circuit Switched Networks

    Publication Year: 1980, Page(s):781 - 793
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1184 KB)

    This paper assesses the impact of integrating voice and data over circuit switched networks. Three main types of circuit switching are considered: 1) traditional circuit switching, 2)fast circuit switchingemploying advanced switching speeds, and 3) enhanced circuit switchingemploying time assigned speech interpolation (TASI) and adaptive data multiplexing (ADM) techniques. The circuit switching ne... View full abstract»

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  • On Calculations Transient Statistics of a Discrete Queueing System with Independent General Arrivals and Geometric Departures

    Publication Year: 1980, Page(s):908 - 910
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    An approximation algorithm is developed for calculating transient mean and variance of the queue size of a discrete queueing system with independent general arrivals and geometric output processes. The algorithm makes no assumption on the form of the distribution function of the arrival process and only the first three moments of the arrival process are required. Three numerical examples are prese... View full abstract»

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  • An Error Probability Formula for Linear Coded Digital Signals

    Publication Year: 1980, Page(s):904 - 905
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    A formula for the probability of error in a digital system subjected to noise and intersymbol interference is derived. The transmitted symbols are encoded by forming the weighted sum of the M most recent, independent, multilevel source digits. This linear coding operation in cludes, as a special case, the family of partial response codes. View full abstract»

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  • Acquisition Behavior of the Cross-Coupled Phase-Locked Loop FM Demodulator

    Publication Year: 1980, Page(s):897 - 904
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    In this work, the acquisition behavior of a cross-coupled phase-locked loop (CCPLL) FM demodulator capable of suppressing cochannel and adjacent channel interferers is examined. This novel detector consists of two phase-locked loop (PLL) demodulators interconnected in such a manner as to permit one PLL to lock onto and track the stronger received signal, while the other loop tracks and demodulates... View full abstract»

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  • A Unifying View of Second-Order Measures of Quality for Signal Classification

    Publication Year: 1980, Page(s):807 - 816
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    The major purpose of this paper is to promote interchange between the fields of pattern recognition and communications, in the realm of statistical classification. The general class of second-order measures of quality for statistical classification is defined. The variety of members in this class that have been used by practitioners or proposed by theorists for numerical pattern-classification and... View full abstract»

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  • Constant Envelope Bandlimited BPSK Signal

    Publication Year: 1980, Page(s):889 - 897
    Cited by:  Papers (7)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A modified BPSK modulation technique using premodulation filtering is presented. The modified BPSK modulator achieves a smooth phase transition from 0 to π rad by going through an intermediate value of \pi/2 rad. The resultant PSK signal has a very low AM component, particularly suitable for data transmission through nonlinear channels. Experimental test... View full abstract»

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  • Exponential Servers Sharing a Finite Storage: Comparison of Space Allocation Policies

    Publication Year: 1980, Page(s):910 - 915
    Cited by:  Papers (16)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Consider a finite waiting room shared by several servers. Such a system may approximate, for instance, a packet switch in a communications network. It is assumed that interarrival and service times have exponential distributions, and that a customer is lost if he cannot enter the waiting room. Different policies for sharing the finite waiting room are compared-the measure of performance being the ... View full abstract»

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  • A Delta Modulation Filter for Speech-Type Signals

    Publication Year: 1980, Page(s):801 - 806
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    This paper considers the realization of an all-digital system for direct filtering of a delta modulation (DM) encoded signal. We have shown [1] that this system can be realized fairly easily for any type of filter function when the signals are encoded with a linear DM. We now address the problem of digitally filtering an adaptive DM (ADM) encoded signal. We show that we can again realize any type ... View full abstract»

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  • Optimum Gaussian Filter and Deviated-Frequency-Locking Scheme for Coherent Detection of MSK

    Publication Year: 1980, Page(s):850 - 857
    Cited by:  Papers (9)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (752 KB)

    Predetection Gaussian bandpass filtering effect on the coherent detection of minimum-shift-keying (MSK) is theoretically anlayzed on the basis of the worst signal pattern which brings the maximum intersymbol interference. The optimum 3 dB-down bandwidth (B)-bit duration (T) product of the Gaussian bandpass filter is proved theoretically to be BT = 0.5887 , w... View full abstract»

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  • Offset Cassegrain Earth Station Antenna for the Japanese Domestic Satellite Communication System

    Publication Year: 1980, Page(s):883 - 889
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    Offset reflector antennas have advantages for communication systems because they are not severely subject to blocking. Difficulties mainly arising from structual asymmetries have inhibited the realization of an offset reflector antenna with a large aperture for commercial use. This paper describes the design of an offset Cassegrain earth station antenna for the Japanese domestic satellite communic... View full abstract»

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  • A General Class of PAM Equalizers

    Publication Year: 1980, Page(s):915 - 917
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    This correspondence outlines a new and general class of cost functions which are applicable to adaptive PAM equalizer design. The new functions are shown to exhibit many of the features of well-known functions while promising lower receiver error probabilites. Further work in the area of relating cost functions to equalizer adaption rates is suggested. View full abstract»

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  • Coordinates Versus Sequential Facsimile

    Publication Year: 1980, Page(s):878 - 883
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The purpose of this paper is to quantitatively evaluate the improvement that can be obtained, in the coding of graphics, by using more sophisticated encoding schemes than run-length. These schemes are now well within the reach of today's technology. In the broad class of encoders by coordinates, three isoentropic encoding schemes are considered: 1) encoding of isolated points, 2) encoding of unidi... View full abstract»

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  • Sizing Trunk Bundles Which Can Be Seized at Both Ends with Different Grade of Service

    Publication Year: 1980, Page(s):794 - 801
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    In this paper, a technique is established and prepared tables are furnished for the sizing of trunk bundles which can be seized at both ends, but where different grade of service must be rendered at each end. An approximate approach is also discussed. These solutions find applications in the engineering of foreign exchange voice systems serving a customer base (low blocking) and interdepartmental ... View full abstract»

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  • Data Traffic Performance of Integrated Circuit- and Packet-Switched Multiplex Structure

    Publication Year: 1980, Page(s):873 - 878
    Cited by:  Papers (48)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Results are developed for data traffic performance in an integrated multiplex structure which includes circuit-switching for voice and packet-switching for data. The results are obtained both through simulation and analysis, and show that excessive data queues and delays will build up under heavy loading conditions. These large data delays occur during periods of time when the voice traffic load t... View full abstract»

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  • The Effects of Transponder Imperfections on the Error Probability Performance of a Satellite Communication System

    Publication Year: 1980, Page(s):858 - 872
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (968 KB)

    The bit error rate (BER) performance analysis of a data communication system is generally based on the assumption that signal waveforms are ideal and hardware-induced distortion is absent. In a satellite communication system, such distortion arises in the satellite repeater, as well as in the transmitter and receiver portions. NASA, which is in the process of developing its Tracking and Data Relay... 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