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IEEE Transactions on Communication Technology

Issue 4 • Date August 1970

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Displaying Results 1 - 24 of 24
  • [Front cover and table of contents]

    Publication Year: 1970, Page(s): 0
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    Freely Available from IEEE
  • Remote Control of Permanent Memory Writing Apparatus Using Data Transmission Over Telephone Lines

    Publication Year: 1970, Page(s):271 - 275
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    Development of the No. 1 Electronic Switching System, a stored program system, by Bell Telephone Laboratories has required considerable program debugging and system testing. The bulk of this effort is done in model telephone offices at the Bell Telephone Laboratories locations in Illinois and New Jersey. However, for some actual telephone offices that are the first of a kind, incorporating Hew pro... View full abstract»

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  • A Universal Threshold Extending Frequency-Modulated Feedback Demodulator

    Publication Year: 1970, Page(s):276 - 280
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (563 KB)

    The results of a program to design, develop, and build a threshold extending frequency-modulated feedback (FMFB) demodulator which can be used as a universal demodulator is discussed. Its design details are described, as well as the method whereby its loop gain and frequency characteristics are changed. Both the methods by which it was tested and also the test results are described. Comparisons of... View full abstract»

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  • Effective Application of Forward-Acting Error-Control Coding to Multichannel HF Data Modems

    Publication Year: 1970, Page(s):281 - 294
    Cited by:  Papers (5)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1478 KB)

    The results of a recent study to determine and evaluate effective methods of applying forward-acting error-control-coding techniques to multichannel high-frequency (HF) data modems are presented. A unique feature of this study is a conscious exploitation of the fine-grain bit-error behavior, both in time and in frequency, that is characteristic of multichannel HF data transmission systems. Attenti... View full abstract»

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  • Carrier Transmission of Binary Data in a Restricted Band

    Publication Year: 1970, Page(s):295 - 304
    Cited by:  Papers (87)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (948 KB)

    The spectra of digital frequency modulation (FM) signals have been observed to be narrow compared with the spectra of digital baseband signals or the corresponding amplitude modulation (AM) and phase modulation (PM) signals. This suggests a high efficiency of transmission in terms of occupied bandwidth for binary FM. Here the desirability of digital FM systems is investigated further with an exami... View full abstract»

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  • A New Digital Frequency Detection Scheme

    Publication Year: 1970, Page(s):305 - 313
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (925 KB)

    A new digital frequency detector for discriminating between the location of a noisy sinusoidal signal in one of two frequency bands is presented. Lower performance bounds of the detector are obtained. It is shown that the detector can discriminate between any two frequencies in a wide frequency band, and that these two frequencies can be arbitrarily close. Furthermore, correct decisions will be ma... View full abstract»

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  • Angle-Modulation Power Spectra

    Publication Year: 1970, Page(s):313 - 318
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (535 KB)

    Exact expressions are obtained for the autocorrelation function of a sinusoidal carrier phase- or frequency-modulated by Butterworth-filtered white Gaussian noise. The corresponding power spectra are obtained numerically, together with bounds on the error resulting from truncation of the Fourier integrals. The spectra are relatively inaccurate in the tail regions, where other methods of calculatio... View full abstract»

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  • Wide-Band Detection of FSK Transmissions in a Three-Component-Two-Path Channel

    Publication Year: 1970, Page(s):319 - 332
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1262 KB)

    The multipath model evaluated is of a three-component-two-path type. In several space channels we have a directtransmission path and a reflected-transmission path. The direct component can be described as specular, while the reflection is a composition of both a specular component and one that is diffuse. The channel bit error probability for noncoherent wide-band frequency-shift keying (FSK) is o... View full abstract»

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  • Transmission of MFSK Signals in Several Frequency Uncertain Channels

    Publication Year: 1970, Page(s):333 - 338
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (566 KB)

    The performance metric (symbol error rate) of the optimum in-the-limit receivers for the detection of a frequency uncertain M -ary frequency shift-keyed (MFSK) transmission in additive Gaussian noise is derived. By in-the-limit, we mean the limiting cases of high and low signal-to-noise ratio (SNR). The performance of the two receivers are compared for some spe... View full abstract»

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  • Sequential Block Orthogonal Signaling with Two Noiseless Decision Feedbacks

    Publication Year: 1970, Page(s):339 - 344
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (519 KB)

    A sequential block orthogonal signaling scheme with both an intermittent and a final decision feedback is developed. The reliability function for this communication technique is shown to be bounded below by \alpha _{\max } \bar{C} - R , for 0 \leq R < \bar{C} where αmaxis one-half of the ratio of the ma... View full abstract»

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  • Coherency for the Binary Symmetric Channel

    Publication Year: 1970, Page(s):344 - 352
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (922 KB)

    For the purpose of communication system planning, predictions of system performance based upon models of an ideal coherent channel are extensively used. Previous work has demonstrated the deleterious effects of radio frequency (RF) phase error on channel performance by machine computation of an integral derived by statistically averaging over the phase error. The required receiver performance in e... View full abstract»

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  • Carrier Acquisition for Coherent Demodulation of Pulse-Amplitude Modulation

    Publication Year: 1970, Page(s):353 - 360
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (734 KB)

    Phase recovery in vestigial sideband (VSB) data transmission is discussed. Examining a particular aspect of this broad area, attention is focused on the time required to recover carrier phase in order to achieve a satisfactory error rate. We derive the acquisition time for simple models. Our results are exhibited graphically, relating pertinent system parameters. These results indicate that while ... View full abstract»

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  • Electronic Color Separation with Laser Light Sources

    Publication Year: 1970, Page(s):361 - 366
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (735 KB)

    Improvements in electronic color scanners appear possible by replacing current light sources with coherent radiation from lasers with much higher radiance. This allows higher speeds of operation (subject to mechanical constraints), greater enlargement capability, and the use of lower sensitivity recording films, or other media. These possibilities were verified experimentally by replacing the read... View full abstract»

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  • The Digital Echo Modulation

    Publication Year: 1970, Page(s):367 - 376
    Cited by:  Papers (4)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (925 KB)

    A new technique for the transmission of binary data over band-limited channels is described. The signaling method is a generalization of Nyquist's telegraph theory, it allows pulse modulation without intersymbol interference within a frequency spectrum centered at any multiple of one quarter of the signaling rate. The signals are derived from pulse trains generated by a combination of logic circui... View full abstract»

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  • Adaptive Equalizer for Pulse Transmission

    Publication Year: 1970, Page(s):377 - 395
    Cited by:  Papers (25)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1829 KB)

    Results are reported which are of interest in the automatic adaptive equalization of telephone lines or other narrowbandwidth channels where data transmission is limited primarily by intersymbol interference. We describe an algorithm for adjusting the tap gains of a tapped delay line (TDL) equalizer which converges for all channels to the setting, which minimizes the mean-square error (rose) at th... View full abstract»

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  • Atmosphere Propagation and Communication Channel Model for Laser Wavelengths

    Publication Year: 1970, Page(s):396 - 416
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2486 KB)

    The advent of the laser has generated much interest in its use for communication. Consideration is given in this paper to obtaining a communication channel model of the atmosphere for laser frequencies. For this purpose a fairly exhaustive, tutorial, and partly critical review of a major part of the extensive literature pertaining to theoretical and experimental results on the propagation of laser... View full abstract»

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  • Level Crossing Rates of an Equal-Gain Predetection Diversity Combiner

    Publication Year: 1970, Page(s):417 - 426
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (662 KB)

    An M branch equal-gain predetection space-diversity combiner is analyzed for the case where the signals received from the individual branches of such a combiner are partially correlated. The level crossing rate (LCR) of the combined signal envelope equals the probability density function times a function of the direction of motion. When a linear antenna array i... View full abstract»

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  • PSK Demodulator with Delay Line for the PCM-TDMA System

    Publication Year: 1970, Page(s):427 - 434
    Cited by:  Papers (7)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (867 KB)

    In the pulse-code modulation-time-division-multipleaccess (PCM-TDMA) system for the next global satellite communications, minimization of synchronization bits in each burst is desirable to improve the traffic efficiency. A new phaseshift keyed (PSK) demodulating system with a delay line is proposed to meet the previous requirement, and the design of its scheme and its experimental performance are ... View full abstract»

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  • A Digital Channel Vocoder

    Publication Year: 1970, Page(s):435 - 442
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (782 KB)

    An all digital realization of a channel vocoder is described, including both computational algorithms and hardware structures. The machine, constructed almost entirely of digital elements, operates at a 2400 bit/s rate and produces synthetic speech, whose intelligibility and speaker recognition properties are comparable to those of an average telephone line. The extensive use of integrated digital... View full abstract»

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  • The Effects of Self-Noise on Error Voltage of the Delay-Lock Discriminator

    Publication Year: 1970, Page(s):443 - 447
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (410 KB)

    This paper deals with the effects of the correlation self-noise on the error voltage of a radio frequency (RF) delaylock discriminator. The error voltage at the output of the envelope correlation network is determined in terms of the spectral components of the maximal-length sequence and the frequency response of the bandpass filters used in the two channels of the correlation network. The slope o... View full abstract»

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  • Evalution of the Effects of Notch Filters on Digital Data Transmission

    Publication Year: 1970, Page(s):447 - 449
    Cited by:  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (326 KB)

    The performance impairment resulting from the insertion of a narrow-band rejection filter (notch filter) in a data transmission channel is evaluated. To isolate the effects of notch filtering, it is assumed that, before inserting the notch filter, the data signal is an idealized pulse amplitude modulation (PAM) signal using a pulse shape which produces no intersymbol interference (Nyquist pulse). ... View full abstract»

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  • On the Equivalence in Performance of Several Phase-Locked Loop Configurations

    Publication Year: 1970, Page(s):449 - 452
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A double-superheterodyne tracking loop using two frequency converters to provide coherent reference signals for demodulation is analyzed and compared to two other well-known configurations. It is shown that if the loop parameters are defined appropriately, then the dynamic noise performance of the loop is identically equivalent to that of a standard phase-locked loop or a double-superheterodyne tr... View full abstract»

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  • Transient Behavior of a Phase-Locked Loop in the Presence of Noise

    Publication Year: 1970, Page(s):452 - 456
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (447 KB)

    Transient behavior of the first-order phase-locked loop in the presence of noise is investigated. Numerical integration is used to obtain solutions for the Fokker-Planck equation which represents loop dynamics, Results illustrate quantitative behavior of the time-varying probability density function of phase error when the input is a constant frequency sinusoid in the presence of additive white Ga... 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