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IEEE Transactions on Communication Technology

Issue 6 • Date December 1970

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Displaying Results 1 - 19 of 19
  • [Front cover and table of contents]

    Publication Year: 1970, Page(s): 0
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    Freely Available from IEEE
  • NX-1E Routing Control Complex

    Publication Year: 1970, Page(s):729 - 733
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (555 KB)

    This paper describes a system using an electronic stored program processor and ferrite core data memories to implement the routing control functions of a common control crossbar telephone central office. Of central importance to the design is provision for the system to be applicable both for new installations and for expanding existing offices without obsoleting equipment already in service. Proc... View full abstract»

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  • NX-1E, an Electronically Controlled Crossbar Switching System

    Publication Year: 1970, Page(s):734 - 740
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (803 KB)

    A central office crossbar switching system with functionally separate electronic common control units is described. The common control subsystem is divided into routing control, trunk supervision control, and data storage functions. Routing control is performed by a stored program controlled electronic processor. Trunk supervision control is accomplished on an optional basis either by a common wir... View full abstract»

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  • The Design of a Low Data Rate MFSK Communication System

    Publication Year: 1970, Page(s):740 - 750
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    Low data rate communications are of considerable interest for applications in which the received signal-to-noise ratio is very low. At data rates below the neighborhood of 5 bit/s, coherent communication techniques become inefficient, and noncoherent techniques such as m -ary frequency shift keying (MFSK) become attractive. In this paper, the design of an MFSK... View full abstract»

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  • False Clicks in FM Detection

    Publication Year: 1970, Page(s):751 - 756
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (558 KB)

    It is shown that the expected number of clicks per second at the output of a conventional frequency modulation discriminator is smaller than the number given by Rice [1]. In any analysis of the discriminator the difference is small, and it does not affect the output signal-to-noise ratio appreciably. However, m the analysis of threshold extending demodulators, which remove a large number of clicks... View full abstract»

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  • PCM Bit Synchronization and Detection by Nonlinear Filter Theory

    Publication Year: 1970, Page(s):757 - 762
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (502 KB)

    A synchronization technique for use with noisy digital waveforms is developed. This is accomplished by determining a relationship for the evolution of the joint probability density of the epoch of the bit sequence and the bit sequence itself. A bit by bit decision criterion is then determined which is the optimum sequential estimator. View full abstract»

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  • The Response of a Quasi-SSB-FM System to Noise

    Publication Year: 1970, Page(s):763 - 772
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (755 KB)

    In this paper we introduce the concept of a quasisingle-sideband frequency modulation (SSB-FM) signal and show that this signal has approximately the same bandwidth as an SSB-FM signal but does not fade and peak as sharply as an ordinary SSB-FM signal. The threshold of a sinusoidally modulated SSB-FM signal is calculated and is shown to be significantly poorer than the threshold of an ordinary FM ... View full abstract»

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  • FASTFAX, a Second Generation Facsimile System Employing Redundancy Reduction Techniques

    Publication Year: 1970, Page(s):772 - 779
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (813 KB)

    A digital coded facsimile system has been developed employing redundancy reduction techniques to reduce the timebandwidth product requirement over conventional facsimile by a factor of 5 to 1 for an average complexity document. Experimental results are presented which illustrate the feasibility of technique using subframe variable velocity raster scanning, fiber optics contact printing, and a simp... View full abstract»

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  • Mutual Coupling Effect on Maximum-Ratio Diversity Combiners and Application to Mobile Radio

    Publication Year: 1970, Page(s):779 - 791
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    The mutual coupling effects on an M -branch maximumratio combiner with correlated signal fading in general are considered. The results in the mobile radio case show that the average power delivered to the receiver becomes less as the antenna spacing of an antenna array decreases (i.e., the mutual coupling increases) with either an optimum load network or an opt... View full abstract»

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  • Experimental Confirmation of an HF Channel Model

    Publication Year: 1970, Page(s):792 - 803
    Cited by:  Papers (130)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1230 KB)

    Specially designed HF ionospheric propagation measurements were made and analyzed to confirm the validity and bandwidth limitations of a proposed stationary HF ionospheric channel model. In the model, the input (transmitted) signal feeds an ideal delay line and is delivered at several taps with adjustable delays, one for each resolvable ionospheric modal component. Each delayed signal is modulated... View full abstract»

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  • The Effect of Fading on the Performance of a Multihop PCM Radio System

    Publication Year: 1970, Page(s):804 - 810
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (534 KB)

    The effects of fading on the error-rate performance of a multihop line-of-sight PCM radio system, operated with or without diversity, are theoretically analyzed. A set of approximate formulas for the distribution of error probability has been established. These formulas can be used to determine the necessary carrier-to-noise power ratio in a noncoherent frequency-shift keying or coherent phase-shi... View full abstract»

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  • Estimation of Bit Probability of Error Using Sync Word Error Rate Data

    Publication Year: 1970, Page(s):811 - 814
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    Assuming bit errors are independently distributed with a constant probability of error pe, it is shown that a simple estimator is highly efficient for estimation of pe. The estimator is based on a simple function of the number of sync words containing no bit errors. The estimator is shown to be maximum likelihood, minimum chi-square, and modified minimum chi-square when the q... View full abstract»

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  • DPSK Versus FSK with Frequency Uncertainty

    Publication Year: 1970, Page(s):814 - 817
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (325 KB)

    Expressions and curves of error probabilities of differential phase shift keying (DPSK) and noncoherent frequency shift keying (FSK) are obtained as a function of the pulse carrier frequency offset. These indicate that the frequency offset which causes the DPSK error probability to be larger than the FSK error probability is approximately \Delta \omega T = 0... View full abstract»

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  • On Synchronization of Convolutional Codes

    Publication Year: 1970, Page(s):817 - 821
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (613 KB)

    Loss of Synchronization may have a number of effects on the decoding process of a convolutional code. At best there will be a transient effect on the decoder; at worst error propagation will be initiated; or the information sent Will be made worthless by a loss or gain of digits during transmission. A method for detecting and correcting slippage similar to that used for cyclic codes will be examin... View full abstract»

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  • Error Performance of Multiphase DPSK with Noise and Interference

    Publication Year: 1970, Page(s):821 - 824
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (537 KB)

    This paper is a sequel to a previous paper which considered the error performance of binary DPSK transmission for the case of noise and general cochannel interferences. The present work extends that analysis to include multiphase signaling. Whereas the binary analysis produced exact expressions for the probability of error, the extension to M -ary DPSK consider... View full abstract»

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  • The Application of Computers to Radio Engineering Functions

    Publication Year: 1970, Page(s):824 - 828
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    This paper explores various factors to be considered in the application of computer techniques to radio engineering functions. A general outline of the radio engineer functions related to system performance, layout engineering, frequency coordination, and administration are included. The interrelationship of the decision parameters of manpower, economics, work volume, work complexity, and computer... View full abstract»

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  • Noise Bandwidth of Common Filters

    Publication Year: 1970, Page(s):828 - 830
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (291 KB)

    The noise bandwidth BNof Butterworth, Bessel, and Chebyshev filters is tabulated. The Butterworth filter is shown to have the minimum BNto 3-dB bandwidth ratio for any secondorder filter. It is proven that BNis invariant when a low-pass to bandpass transformation is made. An error is corrected in recent tables of Chebyshev filters. View full abstract»

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  • Error Power and Equivalent Gain for Uniform Quantizers

    Publication Year: 1970, Page(s):830 - 832
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (233 KB)

    Earlier results are applied to a class of random input signals possessing a certain symmetry, yielding a generalized expression for the mean-square error as well as a relation for the equivalent gain. View full abstract»

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  • [Back cover]

    Publication Year: 1970, 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