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IEEE Transactions on Communications

Issue 6 • Date June 1973

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Displaying Results 1 - 24 of 24
  • [Front cover and table of contents]

    Publication Year: 1973, Page(s): 0
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    Freely Available from IEEE
  • Error-Correcting Codes, Second Edition

    Publication Year: 1973, Page(s): 782
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1973, Page(s): 0
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    Freely Available from IEEE
  • Error Rates on a Data Link with Nonlinear Regeneration

    Publication Year: 1973, Page(s):671 - 679
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    A model of nonlinear data wave regeneration without retiming is analyzed. Attention is focused on performance after regeneration and subsequent detection. The communication model consists of a pseudoternary signal that is regenerated at one data station, but not retimed prior to retransmission to another station. The signal regeneration is accomplished by a three-level slicer, and this nonlinear t... View full abstract»

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  • Bandwidth Compaction Codes for Communications

    Publication Year: 1973, Page(s):687 - 695
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    The familiar error-correction codes allow a reduction in the required signal-to-noise ratio at the expense of an increase in bandwidth. Here we reverse the problem and investigate codes that permit a reduced bandwidth at the expense of an increase in the required signal-to-noise ratio. Theoretical properties of these bandwidth compaction codes have been published previously. This paper emphasizes ... View full abstract»

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  • Clipping and Signal Determinism: Two Algorithms Requiring Validation

    Publication Year: 1973, Page(s):738 - 744
    Cited by:  Papers (22)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Two algorithms are proposed for recovering signals subjected to bandpass clipping and related types of nonlinear transformations. Both are based on contraction mapping principles and both seem to work experimentally, but neither has been validated formally. The conditions on signal determinism suggested by the algorithms have interesting practical implications. View full abstract»

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  • Low Bit Rate Differential PCM for Monochrome Television Signals

    Publication Year: 1973, Page(s):706 - 714
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1032 KB)

    This paper contains an examination of the performance of low bit rate differential PCM systems when used to encode monochrome National Television System Commission (NTSC) television pictures. 12 different encoders with various sampling rates and numbers of quantizing levels operating at bit rates from 9 to 24 Mb were considered. The differential PCM systems were implemented by using an 8-b PCM A/D... View full abstract»

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  • An Approach to the Analysis of Performance of Quasi-Optimum Digital Phase-Locked Loops

    Publication Year: 1973, Page(s):733 - 738
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    An approach to the analysis of performance of quasioptimum digital phase-locked loops (DPLL's) is presented. An expression for the characteristic function of the prior error in the state estimate is derived, and from this expression an infinite dimensional equation for the prior error variance is obtained. The prior errorvariance equation is a function of the communication system model and the DPL... View full abstract»

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  • An Investigation of Telephone-User Habits by Means of Computer Techniques

    Publication Year: 1973, Page(s):663 - 671
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    This paper presents a study of traffic data collected at the telephone exchange (PABX) of The Norwegian Institute of Technology. A recording system primarily designed for accounting purposes [1] collects a set of data for each outgoing call and stores it on digital magnetic tape. Based on these data a statistical study is carried out emphasizing the properties of traffic sources, single subscriber... View full abstract»

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  • Comparing Bandwidth Requirements for Binary Baseband Signals

    Publication Year: 1973, Page(s):776 - 781
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The percentage of total power passed through ideal bandlimited channels with bandwidths equal to various multiples of the bit rate is examined for 14 unique binary baseband signaling schemes. The channel bandwidth required to pass 5 percent of the total power is determined as a measure of the need for near-dc channel response. Conclusions are reached as to which signals would be most suitable for ... View full abstract»

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  • On the Utility of Chirp Modulation for Digital Signaling

    Publication Year: 1973, Page(s):748 - 751
    Cited by:  Papers (52)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The issue of signal selection in binary data transmission is presented. The question of the relative utility of linear frequency sweeping (LFS or chirp), compared to PSK and FSK, in terms of error probability and spectrum usage, is discussed. The transmission media considered are the coherent, partially coherent, Rayleigh, and Rician channel models. Theoretically, LFS has unconditionally superior ... View full abstract»

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  • High-Capacity Digital Line Links

    Publication Year: 1973, Page(s):680 - 686
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    A hybrid digital transmission system of the kind originally proposed by Chang and Freeny [4], [6] is considered. Based on predictions about cable and repeater costs around 1980, an investigation of a certain economic measure of goodness is performed. Specifically, the influence on the system cost of the choice of certain fundamental system parameters like repeater spacing, symbol rate, and number ... View full abstract»

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  • Compression of Weather Charts by the Segmented Lynch-Davisson Code

    Publication Year: 1973, Page(s):774 - 776
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The Lynch-Davisson (L-D) code is shown to be efficient for compressing line-scanned weather charts wherein each line is divided into equal-length segments, and a separate L-D code is generated for each segment. As the number of segments increases, the L-D code length decreases appreciably, thereby simplifying the encoding and decoding operations. However, the accompanying decrease in the overall c... View full abstract»

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  • Techniques for Reducing the Visibility of Transmission Errors in Digitally Encoded Video Signals

    Publication Year: 1973, Page(s):695 - 706
    Cited by:  Papers (21)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2200 KB)

    This paper is concerned with the problem of transmission errors in digitally encoded television signals. Various techniques for reducing the visibility of transmission error effects in the reconstructed signals have been evaluated using computer-produced film sequences. It is found that the visibility of errors in element difference coders is sharply reduced if an erroneous line is replaced by an ... View full abstract»

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  • Two Problems in Simultaneous Communications

    Publication Year: 1973, Page(s):763 - 767
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (624 KB)

    Recent extensions of information and communication theoretic concepts to simple systems involving a single transmitter and several receivers are described and compared in an intuitive and tutorial manner. View full abstract»

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  • A General Queuing Model for Buffer Storage Problems

    Publication Year: 1973, Page(s):744 - 747
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A mathematical model for a general buffered telecommunication system with the output channel available only periodically is constructed and analyzed in this paper. Under the assumptions that certain system parameters are continuous variables, it is shown that the probability density functions for the peaks and valleys of the buffer content are exactly the same as the density functions for the resp... View full abstract»

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  • Some Optimum and Suboptimum Frame Synchronizers for Binary Data in Gaussian Noise

    Publication Year: 1973, Page(s):770 - 772
    Cited by:  Papers (60)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    In this correspondence we investigate the performance of several optimum and suboptimum devices for locating a sync word in data corrupted by Gaussian noise. One suboptimum synchronizer, which is extremely simple to instrument, is shown to perform virtually optimally over the entire range of interesting signal-to-noise ratios. View full abstract»

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  • Interference into Angle-Modulated Systems Carrying Multichannel Telephony Signals

    Publication Year: 1973, Page(s):714 - 727
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    An investigation of interference between angle-modulated systems carrying multichannel telephony, which is directly applicable to existing satellite and terrestrial radio-relay systems, has been undertaken. This study includes a general solution for arbitrary narrow-band interference into an angle-modulated system with arbitrary modulation. The algorithm has been implemented on a digital computer ... View full abstract»

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  • An Experimental Study of Roundoff Effects in a Tenth-Order Recursive Digital Filter

    Publication Year: 1973, Page(s):757 - 763
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    This paper reports experimental measurements of limitcycle amplitude and period in digital recursive filters. The results that were obtained on two cascaded forms of a tenth-order filter show good agreement with existing theoretical bounds. (The bounds only apply to single second-order sections because analysis of cascaded sections is difficult.) Roundoff noise of the filter was measured and it ag... View full abstract»

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  • The New-Word Policy and Decision Feedback in Loop Data Communication Networks

    Publication Year: 1973, Page(s):727 - 730
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The new-word policy with decision feedback is shown to improve the efficiency of loop data communication with noisy links to the extent that the average number of loop transmissions per new word increases only linearly with the number of identically noisy links. This compares to an exponential increase in more conventional acknowledge-or-retransmit systems. Also, in the (almost) noiseless case, a ... View full abstract»

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  • A Comparison of Optimum and Logarithmic Quantization for Speech PCM and DPCM Systems

    Publication Year: 1973, Page(s):752 - 757
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    Two quantization rules, optimum (minimum mean-square error) and logarithmic companding, are compared for application to digital speech transmission. Comparison is made on the basis of signal-to-quantizing noise ratio (S/N), subjective quality judgments, idle channel noise, and dynamic range. These quantizers are considered in both PCM and differential PCM configurations. A computer algorithm is de... View full abstract»

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  • Pseudonoise Code Acquisition Using Majority Logic Decoding

    Publication Year: 1973, Page(s):772 - 774
    Cited by:  Papers (35)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    This paper considers the use of majority logic decoding as a pseudonoise code acquisition technique. A bound on the probability of code acquisition is derived and it is shown that the probability of acquiring an 8191 code in one attempt can be made nearly one at -10-dB SNR. View full abstract»

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  • A Method for Synchronous Data Transmission Between Electronic Data Switching Exchanges

    Publication Year: 1973, Page(s):730 - 733
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    In electronic data switching (EDS) exchanges through connection is performed according to the asychronous time-division multiplex principle. In an input code converter, a polarity reversal on a connected subscriber line or trunk is converted into a line address. With the aid of the central control/storage unit this line address is translated into the address of the serving line; via an output code... View full abstract»

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  • On Moments and Walsh Characteristic Functions

    Publication Year: 1973, Page(s):768 - 770
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    This correspondence treats the derivation of natural moments from their corresponding Walsh characteristic function via the dyadic derivative operator. The derivation of a result concerning Walsh transforms of dyadic derivatives of functions is also considered. However, some established ideas such as Walsh transform, dyadic stationarity, and dyadic correlation are introduced first. 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