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IEEE Transactions on Communications

Issue 5 • October 1972

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Displaying Results 1 - 25 of 42
  • [Front cover and table of contents]

    Publication Year: 1972, Page(s): 0
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    Freely Available from IEEE
  • Waiting-Time Distributions and Buffer Overflow in Priority Queueing Systems

    Publication Year: 1972, Page(s):865 - 877
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB)

    This paper presents a numerical technique for the solution of a class of queueing problems having fixed priority assignment, synchronous service, constant service time, and finite number of sources. The analysis yields waiting-time distributions, namely, the probabilities of waiting exactlynWservice cycles or longer. It applies to scanners, multiplexer channels, loop configurations, etc... View full abstract»

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  • A Semicycle of Ground-Potential Rise

    Publication Year: 1972, Page(s):929 - 935
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (691 KB)

    A brief description is presented of why the power utilities need communication during faults. Wire communication channels can supply this need when suitably protected. The maximum groundpotential rise is needed to select protective equipment. How this transient voltage is generated with its wave shape and duration is explained for a single phase-to-ground fault on a power system. The peak occurs a... View full abstract»

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  • Conference Nonblocking Switching Networks

    Publication Year: 1972, Page(s):942 - 946
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    Conferencing in three-stage nonblocking switching networks is investigated. Clos's results are extended to consider networks in which conference connections are made at the cross points rather than through the use of separate conference bridges. If conferencing is allowed only in the center stage, it is shown that the cross-point count is multiplied by approximatelyk/2, where... View full abstract»

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  • Message Propagation Through Random Communication Networks

    Publication Year: 1972, Page(s):946 - 952
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    This study considers the message propagation problem in a "net-alert" situation through directed and undirected random networks havingnnodes and probability of connection between the distinct pairs of nodes equal top. The solution has been obtained by analyzing the structure of the random networks in terms of the probability distribution of the number of contacted new nodes, ... View full abstract»

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  • L-Orthogonal Signal Transmission and Detection

    Publication Year: 1972, Page(s):953 - 960
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (698 KB)

    This paper investigates the detail capabilities and performance characterization of systems that employL-orthogonal signaling techniques.L-orthogonal signals represent a unified set of signals wherein the polyphase and orthogonal (biorthogonal) signal sets are included as special cases. This fact is important since orthogonal (biorthogonal) and polyphase signaling sets repres... View full abstract»

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  • On the Performance of Digital Communication Systems with Bandpass Limiters - Part I: One-Link System

    Publication Year: 1972, Page(s):972 - 975
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (367 KB)

    This paper examines the performance of a digital communication system operating in the presence of additive Gaussian noise when a bandpass hard limiter is inserted into the system. In contrast with earlier published work for large time-bandwidth product systems, small signal-time-duration-noise-bandwidth products at large SNR's are considered. It is found that the degradation introduced by the lim... View full abstract»

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  • On the Performance of Digital Communication Systems With Bandpass Limiters - Part II: Two-Link System

    Publication Year: 1972, Page(s):975 - 980
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    This paper examines the performance of a two-link digital communication system operating in the presence of Gaussian noise on both links when bandpass limiters are inserted into the system. The product of the signal time duration and the noise bandwidth for the systems under consideration is small. It is concluded that under certain conditions, the presence of a limiter can improve the performance... View full abstract»

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  • Spectral Density Bounds on an FM Wave

    Publication Year: 1972, Page(s):980 - 984
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (379 KB)

    Upper and lower bounds on the spectral density of a sinusoidal carrier frequency modulated by a band-limited Gaussian noise signal are derived and we show that these bounds are very close to each other if the ratio of the rms frequency deviation to the maximum modulating frequency is even moderately high. We then show that the results obtained from the quasi-static approximation, often used in suc... View full abstract»

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  • Frame Synchronization in Time-Multiplexed PCM Telemetry With Variable Frame Length

    Publication Year: 1972, Page(s):1005 - 1008
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    New methods of parallel and serial synchronization for time-multiplexed signals are presented. In the parallel case, i.e., when the sync code is transmitted on a separate channel,Msynchronization codes are generated by concatenating (in the sense used in concatenated codes) a common pn-like sequence of short length with words from a self-synchronizable code. The frame synchronizer can l... View full abstract»

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  • Comments On "Testing a Sample Population for the Rayleigh Distribution" and a Succeeding Correction

    Publication Year: 1972, Page(s):1031 - 1032
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (193 KB)

    In a recent correction [2] to previous correspondence [1] it was stated that 3) of the theorem in [1] was invalid due to the statistical dependence of the yi. The joint distribution function of the yiis derived below confirming their dependence, but also upholding the validity of Item 3. Furthermore, an exact goodness of fit test for the Rayleigh distribution based upon the... View full abstract»

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  • Introduction to Signal Transmission

    Publication Year: 1972, Page(s):1046 - 1047
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1972, Page(s): 0
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    Freely Available from IEEE
  • Phase Slipping in Phase-Locked Loop Configurations That Track Biphase or Quadriphase Modulated Carriers

    Publication Year: 1972, Page(s):984 - 991
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The phase-slipping behavior of second-order squaring and quadrupling phase-locked loop configurations is investigated by digital computer simulation. Statistics are obtained for the mean time between batches of phase slips and the duration of the batches, as a function of the effective loop signal-to-noise ratio (SNR). View full abstract»

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  • Differential PCM for Speech and Data Signals

    Publication Year: 1972, Page(s):900 - 912
    Cited by:  Papers (39)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    The performance of differential PCM encoders used for both speech and data signals is investigated. Primarily concerned with data signals, this paper shows how differential PCM systems designed for speech perform with differential-phase-modulation, single sideband and partial response data signals operating at data rates of 1200-9600 bits/s. The seven signals considered in this study are shown in ... View full abstract»

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  • Statistical Dependence Between Components of a Differentially Quantized Color Signal

    Publication Year: 1972, Page(s):890 - 899
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1640 KB)

    The statistical dependence (redundancy) between three differentially coded color components of a video-telephone signal are explored by means of an entropy study. We measure the entropy of the differentially coded color baseband signals both jointly and as three separate signals. The source material consisted of a number of portraittype pictures. The color signal is treated in a format containing ... View full abstract»

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  • Polarization Diversity System for Mobile Radio

    Publication Year: 1972, Page(s):912 - 923
    Cited by:  Papers (199)  |  Patents (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1024 KB)

    Conventional space diversity reception at typical elevated base locations requites separation of 30λ for broadside incidence and even more for in-line incidence and is therefore difficult to implement. A polarization diversity system for mobile radio is proposed. This is a two-branch receiver diversity system with the advantage that the base station antennas can be spaced as closely as desire... View full abstract»

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  • On a Scrambling Property of Feedback Shift Registers

    Publication Year: 1972, Page(s):998 - 1001
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    A scrambling property of binary feedback shift registers is investigated. When the input sequence has a certain defined randomness, the output symbols are uncorrelated everywhere, except possibly at symbol separations that are integer multiples of the exponent of the feedback polynomial. At those points the output autocorrelation is shown to be equal to higher order moments of the input sequence. View full abstract»

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  • Spectrum of Manchester Coded FSK

    Publication Year: 1972, Page(s):1001 - 1004
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    An expression is given for the power spectrum of continuous-phase FSK signals when the baseband signal is split-phase (Manchester) coded and representative plots are presented. View full abstract»

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  • Theory of Synchronous Communications

    Publication Year: 1972, Page(s):1047 - 1048
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    First Page of the Article
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  • Toward a General Class of Time-Division-Multiplexed Connecting Networks

    Publication Year: 1972, Page(s):836 - 846
    Cited by:  Papers (5)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    A new technique for designing a general class of time-division-multiplexed (TDM) connecting networks is presented. The technique is based on an equivalence transformation operating on a pure space-division network. The methods developed can be used for generating networks that are rearrangeable, conditionally nonblocking or strictly nonblocking. A first-degree TDM network is derived using vertical... View full abstract»

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  • Reciprocal Mean-Square Error and Signal-to-Noise Ratio as Distinct Performance Measures in Below-Threshold Communication

    Publication Year: 1972, Page(s):852 - 856
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    In above-threshold communication situations, the estimation bias and hence the modulation suppression are practically negligible; so that the output signal-to-noise ratio (SNR) is numerically very close to the reciprocal of the normalized mean-square error (MSE). The two last performance measures are, however, conceptually distinct as well as numerically widely different below threshold. Whereas i... View full abstract»

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  • The New-Word Policy for Two-Way Feedback Communication

    Publication Year: 1972, Page(s):1041 - 1043
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    A feedback policy, denoted the "new-word policy," is described that permits reduction in the required number of repeats compared to the method commonly proposed. An expression is derived comparing the average number of transmissions required per new word. View full abstract»

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  • Detector Time Delay in Band-Limited Systems

    Publication Year: 1972, Page(s):1043 - 1046
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The effect of the integration interval in an integrate and dump detector in a band-limited system is analyzed. It is found for optimum performance that the interval must be delayed by τ seconds, which can be approximated by finding the interval giving maximum area under the system pulse response. View full abstract»

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  • On Economies of Scale and Integration of Services in Certain Queued Information Transmission Systems

    Publication Year: 1972, Page(s):991 - 995
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    This paper discusses two aspects of the performance and design of certain queued or buffered information transmission systems. Examples are buffered multiplexers and message-switching systems. The first part of the paper examines the theoretical performance of such a system as its output channel capacity and the number of its speed-limited information sources are increased proportionately. The asp... 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