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IEEE Transactions on Communication Technology

Issue 1 • Date February 1971

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Displaying Results 1 - 20 of 20
  • [Front cover and table of contents]

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

    Publication Year: 1971, Page(s): 1
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  • Switching Networks for 10-C Toll and Transit Exchanges

    Publication Year: 1971, Page(s):2 - 8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    The general features of the 10-C toll and transit switching system have been briefly described in two earlier publications [1], [2]. More detailed information on the switching matrix configurations and interconnecting arrangements used in this system and on the calculation and simulation methods employed to ascertain its traffic load handling performance is provided. View full abstract»

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  • Measurement of the Frequency Correlation Function of Fading Channels Using AM Stations as Signal Sources

    Publication Year: 1971, Page(s):9 - 13
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (451 KB)

    Measurements of the statistical characteristics of a proposed HF channel are usually required before such a channel is designed. These measurements require an elaborate test setup with test transmitters at the proposed transmitting sites. This work is therefore both time consuming and expensive, particularly when alternative locations are considered. This paper describes a method which allows the ... View full abstract»

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  • Error Probabilities Due to Impulsive Noise in Linear and Hard-Limited DPSK Systems

    Publication Year: 1971, Page(s):14 - 20
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (643 KB)

    A method previously presented by the authors for the evaluation of error probabilities in digital systems when impulsive noise is the main cause of incorrect decisions is here applied to differential phase-shift keying (DPSK) modems. Specifically, the receiver impulsive characteristic, which is proportional to the error rate, is evaluated for binary DPSK systems both in the linear and hard-limited... View full abstract»

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  • Frequency-Counted Measurements and Phase Locking to Noisy Oscillators

    Publication Year: 1971, Page(s):21 - 30
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (895 KB)

    The phase-error variance of a phase-locked loop is dependent on the stability of its voltage-control oscillator and that of the source oscillator being tracked. Statistics relative to oscillator stability are commonly gathered by counted-frequency techniques and are so specified in manufacturers' data. In order thus to predict the performance of a loop using such an oscillator, it is necessary to ... View full abstract»

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  • Threshold Analysis of Phase-Locked-Loop Demodulators Using Most Likely Noise

    Publication Year: 1971, Page(s):31 - 41
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (959 KB)

    A new method for determining the number of spikes per second, and hence the threshold carrier-to-noise ratio (CNR), of the phase-locked-loop demodulator is presented. This technique can also be applied to the frequency demodulator with feedback. This method is applicable when nonwhite noise is present at the input of the demodulator and also when the carrier is frequency modulated. Computer proces... View full abstract»

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  • An Analysis of the Phase Coherent - Incoherent Output of the Bandpass Limiter

    Publication Year: 1971, Page(s):42 - 49
    Cited by:  Papers (37)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (631 KB)

    Many applications of the bandpass limiter (BPL) involve coherent demodulation following the limiter. It is shown that as a result of demodulation, the signal mean and the noise variance are direct functions of the phase angle between the signal component passed by the BPL and the coherent reference. As a result, the relationship between the output and input signal-to-noise ratio may be significant... View full abstract»

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  • Image Coding by Linear Transformation and Block Quantization

    Publication Year: 1971, Page(s):50 - 62
    Cited by:  Papers (105)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1837 KB)

    The feasibility of coding two-dimensional data arrays by first performing a two-dimensional linear transformation on the data and then block quantizing the transformed data is investigated. The Fourier, Hadamard, and Karhunen-Loève transformations are considered. Theoretical results for Markov data and experimental results for four pictures comparing these transform methods to the standard me... View full abstract»

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  • SSB/FDM Utilizing TDM Digital Filters

    Publication Year: 1971, Page(s):63 - 71
    Cited by:  Papers (12)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (697 KB)

    Theoretical and practical results in the field of digital filtering encourage the examination of digital filters for use in multiplex communication systems [1]-[3]. Although their economic breaking in will only come in combination with large-scale integration of digital circuits, it appears worthwhile to study their feasibility for various applications [4]-[7], [9]. One application of particular i... View full abstract»

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  • Systems Engineering Survey of Subscriber Loop Plant

    Publication Year: 1971, Page(s):71 - 79
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (825 KB)

    A survey is described in which a random sample of 1000 telephones was drawn from a universe of 5.7 million General System main telephones in the United States and Canada. Survey data relating to the sample telephones, the serving central offices, and the transmission media between offices and telephones were computer processed to develop estimates of the General System's plant composition, costs, ... View full abstract»

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  • Complex and Envelope Covariance for Rician Fading Communication Channels

    Publication Year: 1971, Page(s):80 - 84
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    In practice, the measurement of the covariance function (which characterizes a time- and frequency-selective fading communication channel) involves envelope detecting the received signals before correlating. Envelope covariance is insufficient for an accurate evaluation of system performance and rather a complex covariance is needed. In this paper the relationship between complex covariance and en... View full abstract»

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  • Channel Coding with a Sequential Algebraic Coding Scheme

    Publication Year: 1971, Page(s):84 - 85
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (247 KB)

    In this paper a simple coding scheme utilizing both sequential and algebraic coding is proposed, and bounds on its performance are derived using theoretical bounds on the performance of sequential decoding. These bounds are compared with bounds on a similar, though more complex, scheme proposed by Falconer [2]. Except for sequential rates in a range strictly above View full abstract»

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  • Phase Noncoherent Reception of Binary FSK Signals Using Postdecision Feedback

    Publication Year: 1971, Page(s):85 - 88
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (413 KB)

    The results of Kramer and Viterbi m postdecision feedback problems are extended for the case when the phases of the binary frequency-shift keying (FSK) signals transmitted are not known. A suboptimum scheme for the receiver is suggested that is found to allow better performance characteristics than an optimum coherent receiver operating without postdecision feedback. View full abstract»

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  • Performance of Sequential Decoding with Biorthogonal Modulation and Q-Level Quantization

    Publication Year: 1971, Page(s):88 - 92
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (394 KB)

    Rcompversus ... View full abstract»

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  • Spectrum Economy for Filtered and Limited FSK Signals

    Publication Year: 1971, Page(s):92 - 96
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (561 KB)

    Where a frequency-shift keying (FSK)keyer generating a spectrum that is broad compared to that required for the information is used, considerable spectrum economy can often be obtained by passing the signal through a properly selected symmetrical bandpass filter. The signal can then be passed through a hard limiter which regenerates some of the sidebands filtered off, but not nearly all of them. T... View full abstract»

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  • Comments on "Spectral Properties of Single-Sideband Angle Modulation

    Publication Year: 1971, Page(s):96 - 97
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    It is noted that the essential results published by Mazo and Salz were previously disclosed and obtained using simple and direct Fourier transform computer techniques. When comparing the rms bandwidth of this system with the analogous double-sideband spectrum on the basis of equal modulating signal strength in the two systems, the bandwidth crossover point is actually lower than the value stated b... View full abstract»

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  • The SNR of a Frequency Doubler

    Publication Year: 1971, Page(s):97 - 99
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (278 KB)

    The output signal-to-noise ratio (SNR) of a frequency doubler is calculated using the transform method for nonlinear systems with stochastic inputs. The class of nonlinearities considered is the even V th-power-law devices. It is found that the squarer ( V = 2 ) is optimum at low SNR, while for high SNR, View full abstract»

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  • Testing a Sample Population for the Rayleigh Distribution

    Publication Year: 1971, Page(s):99 - 100
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (202 KB)

    The existence of a Kolmogorov-Smirnov test for goodness of fit to a Rayleigh distribution is shown. The test does not require that the variance of the hypothesized distribution be known. 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