Issue 10 • Dec. 1983

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Displaying Results 1 - 25 of 30
  • Time-Compression Multiplexing (TCM) of three broadcast-quality TV signals on a satellite transponder

    Publication Year: 1983, Page(s):2853 - 2865
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (567 KB)

    We describe how Time-Compression Multiplexing (TCM) might enable the transmission of three National Television System Committee (NTSC) color TV signals through a satellite transponder of 36-MHz bandwidth. The input TV signals are processed such that three fields from each TV source are compressed into an ordinary field period. This is accomplished by sending one field as is but time compressed; th... View full abstract»

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  • Synchronization of noncolocated TV signals in a satellite Time-Compression Multiplexing system

    Publication Year: 1983, Page(s):2867 - 2883
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (758 KB)

    We describe here a simple method to synchronize three TV signals originated from noncolocated up-link stations in a satellite Time-Compression Multiplexing (TCM) system. In this system, information in three fields of each TV picture is compressed into a single field time so that the compressed signals from the three sources can be time multiplexed for transmission. The up-link synchronization ensu... View full abstract»

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  • Theory of reflection from antireflection coatings

    Publication Year: 1983, Page(s):2885 - 2891
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (284 KB)

    The reflection that occurs when a beam, rather than a plane wave, is incident normally on a quarter-wavelength matching layer can be of vital importance in semiconductor laser design. An analysis in three dimensions is given for the general case of a field of arbitrary form and polarization incident on the matching layer. The field is represented as an angular spectrum of plane waves, each compone... View full abstract»

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  • Equivalent queueing networks and their use in approximate equilibrium analysis

    Publication Year: 1983, Page(s):2893 - 2910
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (763 KB)

    Most Markovian queueing networks that arise as models of stochastic congestion systems (e.g., communication networks and multiprogrammed computer systems) do not have a product form in their stationary probability distributions, and hence are not amenable to the simplicity of product-form analysis. In this paper we suggest an approach for systematically examining the validity of a class of approxi... View full abstract»

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  • A model for special-service circuit activity

    Publication Year: 1983, Page(s):2911 - 2934
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (927 KB)

    We describe a model for special-service circuit activity to assist in forecasting, provisioning, and “churn” studies. We assume that customers order a random number of circuits for an exponentially distributed period of time and that the rate of new connect orders grows exponentially with time. These assumptions yield simple formulae giving the means and variances of the number of active circuits ... View full abstract»

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  • TELBECC — A computational method and computer program for analyzing Telephone Building Energy Consumption and Control

    Publication Year: 1983, Page(s):2935 - 2960
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1024 KB)

    Telephone Building Energy Consumption and Control (TELBECC) program has been developed to accurately and efficiently analyze environmental control and energy use in telephone company buildings. The program simulates various operational plans to determine the relative energy and cost savings. By analyzing the operation of the heating, ventilation, and air conditioning system as it regulates a chang... View full abstract»

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  • Recursive fixed-order covariance Least-Squares algorithms

    Publication Year: 1983, Page(s):2961 - 2992
    Cited by:  Papers (10)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1229 KB)

    This paper derives fixed-order recursive Least-Squares (LS) algorithms that can be used in system identification and adaptive filtering applications such as spectral estimation, and speech analysis and synthesis. These algorithms solve the sliding-window and growing-memory covariance LS estimation problems, and require less computation than both unnormalized and normalized versions of the computat... View full abstract»

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  • On the average product of Gauss-Markov variables

    Publication Year: 1983, Page(s):2993 - 3006
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (514 KB)

    Let xibe members of a stationary sequence of zero mean Gaussian random variables having correlations Exixj= σ2ρ|i-j|, 0 < ρ < 1, σ > 0. We address the behavior of the averaged product qm(ρ, σ) ≡ Ex1x2··· x2m−1x2mas m becomes large. Our principal result when σ2= 1 is tha... View full abstract»

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  • Series solutions of companding problems

    Publication Year: 1983, Page(s):3007 - 3052
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1587 KB)

    A formal power series solution (i) x(t) = Σ1∞mkxk(t) is given for the companding problem (ii) Bf{x(t)} = my(t), B{x(t)} = x(t), where B is the bandlimiting operator defined by Bg = (Bg)(t) = ∫ g(s)[sin λ(t − s)]/[π(t − s)]ds and f(t) has a Taylor series with f(0) = 0, f′(0) ≠ 0. Expressions for the xkare given in terms of the coefficients of f... View full abstract»

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  • Bandwidth-conserving independent amplitude and phase modulation

    Publication Year: 1983, Page(s):3053 - 3062
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (363 KB)

    Given two baseband signals f(t) and g(t), suitably restricted in amplitude and bandlimited to [λ, μ] and [−μ, −λ], 0 < λ < μ < ∞, it is shown how to generate a carrier signal, s(t) = A(t) cos{ct + φ(t)}, bandlimited to [c − β, c + β] and [−(c + β), − (c − β)], where β need be only sightly larger than μ, and such that f(t) and g(t) may be recovered by bandlimiting log A(t) and (φ(t), respe... View full abstract»

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  • Papers by Bell Laboratories authors

    Publication Year: 1983, Page(s):3063 - 3069
    IEEE is not the copyright holder of this material | PDF file iconPDF (375 KB)
    Freely Available from IEEE
  • Theory of program testing — An overview

    Publication Year: 1983, Page(s):3073 - 3105
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1362 KB)

    In this paper, we provide a detailed survey of the various approaches to program testing that have been proposed in recent years. Particular attention is given to a discussion of the developing theory of program testing and to the decomposition of the testing problem into the program graph construction, test path selection, and test case generation phases. Examples are included to illustrate the d... View full abstract»

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  • Parallel fault simulation using distributed processing

    Publication Year: 1983, Page(s):3107 - 3137
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1238 KB)

    This paper presents a method of performing fault simulation of digital logic circuits using a special-purpose computer with distributed processing. The architecture for true value simulation presented in an earlier paper can also be used for parallel fault simulation. The special-purpose computer consists of inexpensive microprocessors interconnected by either a time-shared parallel bus or a cross... View full abstract»

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  • Two new kinds of biased search trees

    Publication Year: 1983, Page(s):3139 - 3158
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (950 KB)

    In this paper, we introduce two new kinds of biased search trees: biased, a, b trees and pseudo-weight-balanced trees. A biased search tree is a data structure for storing a sorted set in which the access time for an item depends on its estimated access frequency in such a way that the average access time is small. Bent, Sleator, and Tarjan were the first to describe classes of biased search trees... View full abstract»

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  • An algebraic theory of relational databases

    Publication Year: 1983, Page(s):3159 - 3204
    Cited by:  Papers (15)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1689 KB)

    In this paper we present a theory of relational database systems based on the partition lattice, which represents a new mathematical approach to the structure of relational database systems. A partition lattice can be defined for any given relation. This partition lattice is shown to be a meet-morphic image of the Boolean algebra of subsets of the attribute set. The partial ordering in the lattice... View full abstract»

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  • Generation of syntax-directed editors with text-oriented features

    Publication Year: 1983, Page(s):3205 - 3224
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (833 KB)

    Often, syntax-directed editors rely solely on menu selection for program construction. We describe here the generation of hybrid editors that give a programmer the option of either (1) using menu selection and tree navigation as in a syntax-directed editor, or (2) entering text for parsing and navigating through the text as in a conventional editor at any stage during the expansion of a program. A... View full abstract»

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  • Performance analysis of a preemptive priority queue with applications to packet communication systems

    Publication Year: 1983, Page(s):3225 - 3245
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (756 KB)

    In this paper we analyze the performance of a preemptive priority queue. We give the model description in the context of a packet communication system where message sources, having different priorities, share a common communication channel. Each source generates, as an independent Poisson process, messages consisting of an arbitrarily distributed, random number of fixed-length packets. The channel... View full abstract»

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  • The AR6A Single-Sideband Microwave Radio System: Prologue

    Publication Year: 1983, Page(s):3249 - 3253
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (238 KB)

    The AR6A Single-Sideband Amplitude Modulation (SSBAM) Transmission System makes very efficient use of the radio spectrum by transmitting 6000 message circuits in a 29.65-MHz radio channel. This capability is achieved by maintaining a tighter frequency spacing of the multiplexed mastergroup signals and by discarding redundant sideband signals before transmission over the radio path. The AR6A System... View full abstract»

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  • The AR6A Single-Sideband Microwave Radio System: System design and performance

    Publication Year: 1983, Page(s):3255 - 3312
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2438 KB)

    This paper describes the overall architecture of the first long-distance microwave telephone transmission system to use Single-Sideband Amplitude Modulation in the microwave transmission path. Compared with commonly used frequency modulation systems, the AR6A Single-Sideband Microwave Radio System more than doubles the number of telephone circuits that can be carried per unit of microwave bandwidt... View full abstract»

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  • The AR6A Single-Sideband Microwave Radio System: Radio-line physical design

    Publication Year: 1983, Page(s):3313 - 3335
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1803 KB)

    The physical design of the AR6A radio-line equipment is the product of combining the system operating requirements with the technology available to meet those requirements economically. As part of the description of the radio-line equipment, we discuss the practical considerations for partitioning the circuit block diagrams into realizable units. Modularity is a new feature incorporated into the d... View full abstract»

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  • The AR6A Single-Sideband Microwave Radio System: Radio transmitter-receiver units

    Publication Year: 1983, Page(s):3337 - 3356
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1143 KB)

    This paper describes the essential features and the performance of the AR6A microwave transmitter and receiver. Subsystems that are major contributors to repeater noise are explained in detail. Design objectives for each of these units are given and compared to typical results obtained from measurements. Transmitter linearity was improved substantially through the use of predistortion. The thermal... View full abstract»

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  • The AR6A Single-Sideband Microwave Radio System: Terminal multiplex equipment

    Publication Year: 1983, Page(s):3357 - 3375
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (289 KB)

    A combination of new multiplex facilities provides the 6000-message-circuit loading for AR6A radio. It includes a Mastergroup Translator Type-B (MGTB) arrangement that accepts five U600 mastergroups to translate and combine them into a Multimastergroup (MMG) spectrum. A new multimastergroup translator for radio accepts two such MMG spectra from MGTB to produce the intermediate frequency signal and... View full abstract»

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  • The AR6A Single-Sideband Microwave Radio System: Frequency control

    Publication Year: 1983, Page(s):3377 - 3390
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (846 KB)

    The AR6A Radio System requires precise control of the local oscillator frequency at repeaters and main stations, so that the IF equalizer pilots will be accurately located with respect to the narrowband crystal pick-off filters. In addition, the accumulated frequency error from each repeater and main station must be limited to a value that can be corrected by the tracking receiver of the multimast... View full abstract»

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  • The AR6A Single-Sideband Microwave Radio System: Microwave carrier supply

    Publication Year: 1983, Page(s):3391 - 3408
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1249 KB)

    In the AR6A repeater bay, microwave carrier power for both the receiver and the transmitter is derived from a single voltage-controlled crystal oscillator. For long-term stability, this oscillator is phase locked to an external-reference frequency, available at each radio station. From the output signal of this oscillator, an active frequency-multiplier chain generates about +21 dBm power in the 6... View full abstract»

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  • The AR6A Single-Sideband Microwave Radio System: Equalization for multipath fading

    Publication Year: 1983, Page(s):3409 - 3428
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (911 KB)

    Multipath fading can introduce severe amplitude distortion and level changes in a radio channel. These must be dynamically equalized to meet the toll transmission requirements of AR6A. This article describes equalizer circuitry at intermediate frequencies, which continuously senses the level as a function of frequency in the transmission band and dynamically corrects the effects of multipath fadin... View full abstract»

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