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IEEE Transactions on Communications

Issue 5 • Date 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
  • 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 (1)
    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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  • 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
  • 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 (520 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 approximately View full abstract»

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  • Circuit for Impulse Testing of Gas-Tube Lightning Arresters

    Publication Year: 1972, Page(s):936 - 941
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    Telephone lines may be protected from lightning-induced surges by gas-tube lightning arresters. Typical arresters break down at 250-400 V dc. Breakdown voltage increases with the rate of rise of the applied voltage and may be two or three times the dc value at a rate of rise of 10 kV/μs. Lightning surges on telephone lines approach this rate of rise. The circuit described in this paper genera... 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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  • Delay Performance of a Buffered Communication Network

    Publication Year: 1972, Page(s):1008 - 1015
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    A model is developed to estimate the passage time of a block of data through a group of tandem buffered switches of a buffered data network. In particular, the first two moments and the distribution function of this block passage time are estimated. This estimation procedure contains many assumptions and heuristic arguments that are based on the author's intuition and/or experience. Simulation res... 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 (10)
    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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  • 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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  • 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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  • Polarization Diversity System for Mobile Radio

    Publication Year: 1972, Page(s):912 - 923
    Cited by:  Papers (194)  |  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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  • Special Issues, Page Charges, and a Dues Increase

    Publication Year: 1972, Page(s): 835
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (75 KB)

    First Page of the Article
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  • 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 (1288 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 exactly nW service cycles or longer. It applies to scanners, multiplexer cha... 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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  • 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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  • A Semicycle of Ground-Potential Rise

    Publication Year: 1972, Page(s):929 - 935
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 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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  • 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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  • 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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  • Analysis and Compensation of Bandpass Nonlinearities for Communications

    Publication Year: 1972, Page(s):965 - 972
    Cited by:  Papers (111)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (808 KB)

    There are many instances in communication systems where bandpass signals are passed through nonlinear devices, such as traveling wave tubes, which exhibit both amplitude and phase nonlinearities. When the input signal is narrow band, the device may be characterized by measurements of its single-carrier amplitude and phase transfer functions. A sufficient model for such a device is a quadrature str... 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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  • Optimal Equalization of Discrete Signals Passed Through a Random Channel

    Publication Year: 1972, Page(s):884 - 890
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (688 KB)

    The problem of equalizing a discrete signal that has been transmitted through a channel selected at random from an ensemble of channels is considered. Using mean-square error as the performance index, the minimum number of adjustable parameters required to achieve a given level of performance is sought. For certain special cases, it is shown that, using nonrecursive sampled data filters, the optim... View full abstract»

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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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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