IEEE Transactions on Communications

Issue 10 • October 1974

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Displaying Results 1 - 25 of 39
  • [Front cover and table of contents]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • The Effect of Tandem Band and Amplitude Limiting on the Eb/NoPerformance of Minimum (Frequency) Shift Keying (MSK)

    Publication Year: 1974, Page(s):1525 - 1540
    Cited by:  Papers (50)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1433 KB)

    Minimum (frequency) shift keying (MSK) is a digital modulation technique which can be viewed either as frequency-shift keying (FSK) with peak frequency deviation precisely equal topm(1/4)R_{L}where RLis the link bit rate or as an offset-keyed quaternary phase-shift-keyed modulation. In the absence of bandwidth or amplitude limiting between the modulator and the demodulator, t... View full abstract»

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  • A Digital Carrier-Concentrator System with Elastic Traffic Capacity

    Publication Year: 1974, Page(s):1636 - 1642
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (846 KB)

    Delta modulation is used with a unique method of selective time-division multiplexing (TDM) to obtain concentration switching and digital transmission of telephone subscriber traffic. The switching function is nonblocking and the system can accept traffic without limit. There is, however, a tradeoff between instantaneous traffic load and system transmission quality. A switchsettable blocking limit... View full abstract»

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  • Traffic Engineering for an Elastic Carrier-Concentrator System

    Publication Year: 1974, Page(s):1643 - 1650
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (884 KB)

    This paper is one of three which describe a digital carrier-concentrator system with elastic traffic capacity. It deals with the traffic engineering considerations from a systems application viewpoint. One companion paper [1] describes the system organization, the switching function, supervision and control, and the reframing procedure. The other [2] describes the line equipment, delta codecs, lin... View full abstract»

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  • Subscriber Line Equipment for an Elastic Carrier Switching System

    Publication Year: 1974, Page(s):1651 - 1657
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (687 KB)

    This is the third of three papers [l], [2] dealing with an elastic carrier-concentrator system. The functioning of the subscriber line equipment is described herein. The system serves 256 telephone subscriber lines by digital concentration switching and transmission of multiplexed message channels over a singleT1transmission line. The concentration switching function is nonblocking. Mes... View full abstract»

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  • Some Observations of Satellite/Aircraft Multipath Properties at 1600 MHz

    Publication Year: 1974, Page(s):1720 - 1722
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    In reducing the data from a recent series of high altitude balloon to aircraft measurements atLband, some qualitative results were reported concerning the negative correlation between the vertical and horizontal polarizations. Some of these data are presented in strip chart form to display this effect. In addition, a plot of the sum of the squares of the two polarizations is also presen... View full abstract»

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  • About Optimal Properties of Fast Frequency-Shift Keying

    Publication Year: 1974, Page(s):1726 - 1727
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (209 KB)

    The optimum observation interval for phase-continuous frequency-shift keying (FSK) is longer than2T. View full abstract»

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  • Correction to "Statistical Estimation of Mean Signal Strength in a Rayleigh-Fading Environment"

    Publication Year: 1974, Page(s):1733 - 1734
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (122 KB)

    An error in calculating the first and second moments of the "exponential-Rayleigh" distribution appears in a recent paper; this correspondence presents the correct calculations. View full abstract»

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  • [Back cover]

    Publication Year: 1974, Page(s): 0
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    Freely Available from IEEE
  • An Optimized Buffer Controlled Data Compression System

    Publication Year: 1974, Page(s):1506 - 1515
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1064 KB)

    This paper presents the results of an attempt to develop a rational approach to the design of a practical digital data compression system. The system analyzed is buffer controlled and compresses data by use of a zero-order floating aperture predictor algorithm. For simplicity of analysis and ease in calculation the data to be compressed is modeled as uniformly distributed Markov data. The approach... View full abstract»

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  • Buffer Management for Sequential Decoding

    Publication Year: 1974, Page(s):1685 - 1690
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Sequential decoding has been found to be an efficient means of communicating at low undetected error rates from deep space probes, but another failure mechanism known as erasure or computational overflow remains a significant problem. The erasure of a block occurs when the decoder has not finished decoding that block at the time that it must be output. The erasure rate can be unacceptably high eve... View full abstract»

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  • Two Loop Adaptive Delta Modulation Systems

    Publication Year: 1974, Page(s):1710 - 1713
    Cited by:  Papers (8)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Two adaptive delta modulation (ADM) coders, one for A/D conversion of speech and the other for fiat spectrum signals, have been developed by incorporating a second adaptive feedback loop around the basic delta modulation (DM) coder. The dynamic range of the coder for integrated spectrum has been extended to more than 35 dB with a signal-to-noise ratio (SNR) > 28 dB, for a pulse-repetition frequ... View full abstract»

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  • On the Packet-Interleaved Interface Between Packet-Switched Network and Computers

    Publication Year: 1974, Page(s):1671 - 1675
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    This paper describes a study of transmission control procedure for computer-to-computer and computer-computer-to-terminal communication through a public packet-switched network. Four types of basic data link are defined over a packet travel path in the network, and the functions required for the data link are discussed. A process number and its associated control method are proposed as a method of... View full abstract»

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  • Analysis of a Modified Data Test Set by the Use of Generating Functions

    Publication Year: 1974, Page(s):1706 - 1710
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    An error detecting data test set with a pseudorandom bit test pattern is analyzed using generating functions. A modification to the common design that combines the advantages of automatic and manual synchronization modes is proposed; it provides automatic synchronization and records one error count for each bit in error. View full abstract»

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  • Structural Reliability of Centralized Communication Networks

    Publication Year: 1974, Page(s):1713 - 1715
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    An algorithm for assigning a node as center in a communication network with respect to a reliability criterion is given. For a nonplanar network a suboptimal procedure is proposed. View full abstract»

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  • Satellite-Systems Cost Estimation

    Publication Year: 1974, Page(s):1540 - 1547
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    Cost-Estimate Relations (CER's) are derived for launch/orbit insertion, payload/satellite(s), and the total satellite system. These CER's are expressed in terms of orbit altitude (or apogee), orbit type (circular or elliptical), and payload weight. The CER's are also presented briefly in terms of number of rings, number of satellites per ring, and satellite weight. They are applicable only to recu... View full abstract»

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  • Optimal Message Block Size for Computer Communications with Error Detection and Retransmission Strategies

    Publication Year: 1974, Page(s):1516 - 1525
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    Error detection and retransmission are used as error control in many computer communication systems. In these systems, random length messages are partitioned into fixed size blocks for ease in data handling and memory management. A mathematical model is developed in this paper to determine the optimal message block size that minimizes the expected waiting time in retransmission and acknowledgment ... View full abstract»

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  • Approximate Analysis for Dynamic Channel Assignment in Large Systems with Cellular Structure

    Publication Year: 1974, Page(s):1715 - 1720
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    Two approximate methods for analysis of large-scale probems using dynamic channel assignment and a cellular structure are described. Such problems arise in the areas of mobile radio telephony and in multibeam satellite systems. The grade of service of individual zones is considered in detail. The problem is analyzed in terms of the carried erlang load rather than in terms of the system states. The... View full abstract»

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  • A Decision-Free Equalization Scheme for Minimum-Phase Channels

    Publication Year: 1974, Page(s):1732 - 1733
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    An algorithm previously used for estimating parameters of the vocal tract with a digital filter is here reexamined from the point of view of equalization theory. The procedure of adjusting equalizer taps to minimize the mean-squared sample values at the output of the equalizer (while keeping a particular equalizer tap fixed at unit value) is shown to result in an equalizer that inverts the channel... View full abstract»

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  • Offset Quadrature Communications with Decision-Feedback Carrier Synchronization

    Publication Year: 1974, Page(s):1576 - 1584
    Cited by:  Papers (15)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (736 KB)

    In this paper, we focus our attention on the decisionfeedback approach to carrier synchronization of offset quadrature phase-shift-keyed (QPSK) and more generally offset quadrature amplitude-shift-keyed (QASK) systems. In particular, we present two decision-feedback loops for tracking offset QPSK and offset QASK, which are modifications of comparable loops previously given in the literature for ca... View full abstract»

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  • On an Inequality for the Congestion in Switching Networks

    Publication Year: 1974, Page(s):1675 - 1677
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A basic inequality of le Gall, involving the congestion in four-stage switching networks, is generalized. The basic inequality remains valid in the case of arbitrary occupancy distributions on all link groups in the network. View full abstract»

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  • Spectra of Block Coded Digital Signals

    Publication Year: 1974, Page(s):1555 - 1564
    Cited by:  Papers (94)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (936 KB)

    Block codes are multilevel codes of constant length whose codewords are the channel encodings of binary sequences of constant length. The spectral density calculation of pulse trains resulting from the use of these codes is dealt with. Under the assumption that the encoding be represented by a finite-state synchronous sequential machine, by means of homogenous Markov chain theory, the spectral den... View full abstract»

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  • The Optimum Design of a Tandem Computer Buffer in a System for Remote Data Collection

    Publication Year: 1974, Page(s):1501 - 1506
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    It is anticipated that computer-communications systems designed for the purpose of transmitting data from geographically clustered terminals to a remote computer will employ multiplexing techniques in order to reduce transmission costs. A procedure is described for determining, under three criteria, the optimum computer buffer size assuming that the data traffic arriving at the multiplexer is Pois... View full abstract»

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  • A Criterion for Video Encoding and its Comparison with the Subjective Performances

    Publication Year: 1974, Page(s):1730 - 1731
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    A criterion for differential pulse-code modulation (DPCM) encoding of video signals at a given baud rate has been developed minimizing the mean square error (mse) introduced due to both sampling and quantization. The performances based on this criterion have been compared with the corresponding subjective performances measured earlier. View full abstract»

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  • Error Correction for Voice Grade Data Communication Using a Communication Processor

    Publication Year: 1974, Page(s):1595 - 1606
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1144 KB)

    A general purpose communication processor is investigated as a vehicle for decoding two specific classes of cyclic codes having properties appropriate for voice grade data communication channels. First, a model of a processor is described, and then it is used in conjunction with two cost metrics to measure the complexity of programming the decoding functions. No special Galois field (GF) arithmeti... 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