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, wherek 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
  • Timing Extraction in Baseband Pulse Transmission

    Publication Year: 1972, Page(s):877 - 884
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    Timing extraction through nonlinearity in the presence of pulse overlaps is studied for baseband PCM or PAM systems. It is shown that the systematic jitter can be reduced by proper choices of nonlinearity, coding scheme, and pulse waveform. Discussions on choice of nonlinearity indicate that square-law rectification is desirable for elimination of jitter sources. This nonlinearity derives a freque... View full abstract»

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  • 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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  • 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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  • Automatic Acquisition and Tracking System for Laser Communication

    Publication Year: 1972, Page(s):847 - 851
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    A laser communication system, which has an automatic acquisition and tracking capability without the aid of any other communication link, has been constructed and experimented. It consists of two terminals that can transmit one TV signal and error signals for tracking each other. The heart of this system is a combination of a laser, a position sensor, an angle detector, and an optical deflector th... View full abstract»

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  • A Computerized Test System for Communications Equipment Subassemblies

    Publication Year: 1972, Page(s):1026 - 1029
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    This paper describes an automatic test system for factory testing of telephone carrier equipment channel units. The system is intended for high volume subassemblies such as those found in pulse-code-modulation carrier systems where, typically, there are 24 units in each terminal. With the greater availability of minicomputers and digitally programmable instruments, a system is feasible at moderate... 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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  • 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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  • Frequency Conversion and Limiter Action for an Angle-Modulated Wave With Amplitude Fluctuation in a Half-Wave Linear Mixer

    Publication Year: 1972, Page(s):923 - 929
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    Signal interaction is analyzed when the composite signal of a simultaneously amplitude- and angle-modulated wave, a nonmodulated sinusoidal wave, and a noise is added to a half-wave linear mixer. If a certain mixing condition is satisfied, a half-wave linear mixer operates like an ideal bandpass limiter with frequency conversion function. The limiter action is also verified by experiment. View full abstract»

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  • Decision Hysteresis Reduces Digital Pe

    Publication Year: 1972, Page(s):1038 - 1041
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    It is shown that the source statistics influence the form of the decision threshold in an optimum receiver. For a first-order Markov source, a simple suboptimum realization is a hysteresis loop. The performance improvement over the single threshold decision rule is modest but in some cases it is possible to cut the Pein half. One case where decision hysteresis performs best is in a mode... 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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  • 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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  • Intersymbol Interference as a Natural Code

    Publication Year: 1972, Page(s):1033 - 1037
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    The classical approach of considering intersymbol interference as a modulation problem is replaced by less conventional information decoding considerations. We present the concept of viewing time-dispersive channels as natural convolutional encoders. Several channels are presented as examples and computer simulations exhibit some of the benefits. 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