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IEEE Transactions on Communication Technology

Issue 2 • Date April 1971

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Displaying Results 1 - 22 of 22
  • [Front cover and table of contents]

    Publication Year: 1971, Page(s): 0
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    Freely Available from IEEE
  • Algorithms for Constructing Ideal Gradings for Nonhoming Selectors (An Application of the Theory of Block Designs)

    Publication Year: 1971, Page(s):101 - 112
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1071 KB)

    Algorithms are presented for designing high-efficiency gradings for nonhoming selectors and for expanding an existing grading by the addition of trunks or selectors with minimal rearrangement of the grading while maintaining its efficiency. The grading design problem is formulated as a problem in constructing block designs. The block design problem is shown to be equivalent to a nonlinear programm... View full abstract»

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  • The Probability of Error Due to Intersymbol Interference and Gaussian Noise in Digital Communication Systems

    Publication Year: 1971, Page(s):113 - 119
    Cited by:  Papers (80)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The error rate or the probability of error is an important parameter in the design of digital communication systems. In this paper a Gram-Charlier expansion is used to compute the error rate in the presence of intersymbol interference and additive Gaussian noise. The method presented is very useful for numerical computations. We also present expressions for the truncation errors. Rigorous proofs a... View full abstract»

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  • Filter Distortion and Intersymbol Interference Effects on PSK Signals

    Publication Year: 1971, Page(s):120 - 132
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1164 KB)

    The combined effects of filter distortion and the associated intersymbol interference on coherently detected biphase and quadriphase PSK signals are studied in white Gaussian noise. A determination is made of the system performance degradation from matched-filter detection resulting from the use of a linear channel model that focuses attention on the critical filters in the communication link. The... View full abstract»

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  • Piecewise Fourier Transformation for Picture Bandwidth Compression

    Publication Year: 1971, Page(s):133 - 140
    Cited by:  Papers (15)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1183 KB)

    Recent advances in digital computer and optical technology have made image spectra determination practical. Pratt and Andrews [1] studied bandwidth compression using the Fourier transform of complete pictures. By treating pictures adaptively on a piecewise basis, picture detail is better represented. Also, subjective preferences of human vision can be used, which result in further improvements in ... View full abstract»

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  • Optimum Pre- and Postfiltering of Sampled Signals with Application to Pulse Modulation and Data Compression Systems

    Publication Year: 1971, Page(s):141 - 157
    Cited by:  Papers (19)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1480 KB)

    The following classical problem is solved and the results are applied to minimize the mean-square error ε of communication and data compression systems: "a stationary random input signal x(t) is prefiltered, corrupted by noise n(t) , sampled every T seconds, and finally postfilte... View full abstract»

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  • Data-Aided Carrier Tracking Loops

    Publication Year: 1971, Page(s):157 - 168
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (926 KB)

    An innovation which improves the capability and performance of certain types of phase-coherent demodulators is introduced. This innovation has application in the fields of telemetry and tracking, e.g., relay satellite systems, deep-space communications, and military communication systems. The basic idea of the innovation centers around using the power in the composite signal sidebands to enhance t... View full abstract»

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  • Limits of Instantaneous Priority Multiplexing Applied to Black-and-White Pictures

    Publication Year: 1971, Page(s):169 - 177
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (689 KB)

    Instantaneous priority multiplexing (IPM) is a recently proposed method for transmitting a number of black-and-white pictures through a channel that would otherwise suffice for only one black-and-white picture transmission, given that a certain amount of degradation is acceptable. To analyze this system, a mathematical description has been complemented by a simulation for the human observer in ord... View full abstract»

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  • Performance of Simple Multiplexer - Concentrators for Data Communication

    Publication Year: 1971, Page(s):178 - 187
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (949 KB)

    Multiplexer-concentrators (or asynchronous multiplexers) are devices used to increase the efficiency of telecommunication systems into which the flow of information is erratic. In the analysis of such systems, many assumptions about the statistical nature of the input traffic can be made. The assumptions made here are constant message length, constrained buffer size, and finite number of message s... View full abstract»

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  • Techniques for Designing Finite-Duration Impulse-Response Digital Filters

    Publication Year: 1971, Page(s):188 - 195
    Cited by:  Papers (33)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (719 KB)

    Several new techniques for designing finite-duration impulse-response digital filters have become available in the past few years. The motivation behind three design techniques that have been proposed are reviewed here, and the resulting designs are compared with respect to filter characteristics, ease of design, and methods of realization. The design techniques to be discussed include window, fre... View full abstract»

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  • A TDMA/PCM Experiment on Applications Technology Satellites

    Publication Year: 1971, Page(s):196 - 205
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1136 KB)

    In recent years there has been considerable interest in time-division multiple access (TDMA) for communications via satellites. TDMA is free of intermodulation effects, since only one station signal is present in the satellite at a given time. The principal problem which had to be solved for TDMA was that of establishing and maintaining time synchronization between the participating earth stations... View full abstract»

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  • A Proposal for the Interworking of Preassignment Satellite and Terrestrial Systems with Demand-Assignment Satellite Systems in Interregional Telecommunication Networks

    Publication Year: 1971, Page(s):205 - 210
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (594 KB)

    A proposal is presented for the interworking of preassignment and demand-assignment communication systems in future worldwide telephone networks. Considering the current and future worldwide traffic volume, the possible communication systems, especially the possible multiple-access systems, are compared. As a result, restoring the existing preassigned network by a time-division multiple-access sys... View full abstract»

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  • The Evolution of Station Carrier and Recent Operating Experience

    Publication Year: 1971, Page(s):211 - 217
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (741 KB)

    Subscriber carrier has played an important role in serving sparsely settled rural areas where it was not economical or technically feasible to use voice frequency circuits. For increased usage of carrier in subscriber plant the 1964 Rural Electrification Administration (REA) loop survey [1] showed that several new innovations were needed. Using the loop survey information as a foundation, REA esta... View full abstract»

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  • A Time-Domain Approach to Computing Distortion of Linearly Filtered FM Signals

    Publication Year: 1971, Page(s):218 - 221
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    A digital time-domain method to calculate interchannel distortion of linearly filtered angle-modulated signals is described. The method can handle cases when a transmission medium produces large multipleechoes, or its frequency-domain characteristics can be approximated by a finite set of sinusoidal functions. Sums of sets of equally spaced sinusoids with random phases are used to simulate the bas... View full abstract»

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  • Binary Detection in an Optical Twin Channel Receiver

    Publication Year: 1971, Page(s):221 - 223
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (334 KB)

    In this concise paper we sketch the derivation of a rigorous (and tight) upper bound on the probability of error in a binary pulse-code modulation (PCM) twin channel optical receiver in the absence of thermal noise. This result is valid for any binary system, described by Poisson statistics in each of its states, in which the binary decision is based on which state has the larger count. Examples o... View full abstract»

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  • An Expansion for FM Spectra

    Publication Year: 1971, Page(s):223 - 225
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A formal series expansion is given for the powerdensity spectrum of a carrier frequency-modulated by a random signal. The first term of the series is the well-known Woodward term usually obtained heuristically by considering the FM wave as a slowly changing sinusoid. Higher order terms represent corrections to this quasi-static description. View full abstract»

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  • Correlated Error Statistics on Troposcatter Channels

    Publication Year: 1971, Page(s):225 - 228
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (390 KB)

    The object of this concise paper is to find statistics for the number of errors in a block of n digits transmitted over the troposcatter channel. An approximate solution for FSK modulation is found based on bounding the Correlation between nonadjacent bits. As an application of the result, bit error probabilities were found after using the (23,12,3) Golay code.... View full abstract»

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  • Airframe Requirements for Future Communications

    Publication Year: 1971, Page(s):228 - 233
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    Operational requirements and technology advancements will mold aeronautical communications systems in the next decade. However, communications systems neither size nor configure airplanes, although they may affect design details. Configuration criteria are derived from such parameters as range, payload, and speed. Optimization of airframe and system designs requires that compatible characteristics... View full abstract»

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  • First Slip Times Versus Static Phase Error Offset for the First- and Passive Second-Order Phase-Locked Loop

    Publication Year: 1971, Page(s):234 - 235
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    Static phase error offsets occur in first-order and passive second-order phase-locked loops, whenever the rest frequency of the local oscillator and the carrier are different prior to acquisition. The effect of the offset is to degrade performance and in particular to decrease the mean time to first slip. This paper studies first slip times via computer simulation. The mean time to first slip is d... View full abstract»

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  • Carrier Suppression in Angle Modulated Telemetry

    Publication Year: 1971, Page(s):236 - 238
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    In this correspondence a general expression for carrier power suppression caused by angle modulation by a stationary stochastic process is examined. The result lends insight to the carrier suppression problem, and indicates procedures for determining suppression due to somewhat complicated modulation waveforms. Some extensions of previously known results concerning carrier suppression associated w... View full abstract»

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  • A Solution to the Second Harmonic Interference in Acoustically Coupled Data Sets

    Publication Year: 1971, Page(s):238 - 240
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (359 KB)

    The difficulties encountered by acoustically coupled 103 compatible data sets are considered. In particular the limitations introduced by the harmonic distortion generated by the nonlinearity of the telephone's microphone are analyzed. It is shown that interference between the second harmonic of the transmitted signal and the received signal restricts the application of acoustic coupling to lines ... View full abstract»

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  • [Back cover]

    Publication Year: 1971, Page(s): 0
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    Freely Available from IEEE

Aims & Scope

This Transactions ceased publication in 1971. The current retitled publication is  IEEE Transactions on Communications.

Full Aims & Scope