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Communication Technology, IEEE Transactions on

Issue 3 • Date June 1971

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

    Publication Year: 1971 , Page(s): 0
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    Freely Available from IEEE
  • Minimum-Bandwidth Multiplex Radioteleprinter System

    Publication Year: 1971 , Page(s): 241 - 246
    Cited by:  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (646 KB)  

    A new data system uses AM broadcast signals to carry teleprinter signals. Useable at medium or shortwave frequencies, the multiplex technique provides point-to-point or broadcast teleprinter service utilizing existing transmitters and antennas. A minimum-bandwidth PM subcarrier is used to phase modulate the broadcast carrier wave without disturbing operation of either the broadcast transmitter or ... View full abstract»

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  • Some Design Considerations for Narrow-Band Medical Telemetry Over the Switched-Message Network

    Publication Year: 1971 , Page(s): 246 - 255
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1072 KB)  

    Some of the considerations leading to the design of a three-channel narrow-band analog system for transmitting medical data, primarily electrocardiograms (EKG), over dialed connections are discussed. The advantages and disadvantages of several methods of implementing such systems are compared on the basis of the general systems requirements, the nature of the data to be transmitted, and the limita... View full abstract»

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  • New Optimization Criteria for Message-Switching Networks

    Publication Year: 1971 , Page(s): 256 - 260
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (437 KB)  

    This paper presents a new class of criteria for the optimum Capacity assignment in store-and-forward communication networks under a total fixed-cost constraint. Compared with conventional average-delay optimization these criteria are more sensitive to the needs of the individual user. Closed-form results are attained. View full abstract»

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  • Point-to-Point Loss in Link Systems: Model and Calculation Methods

    Publication Year: 1971 , Page(s): 261 - 267
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (651 KB)  

    The switching networks of modern telephone exchanges are often built as multistage arrays which are controlled by conditional selection. Thereby, the strategy is often applied that a certain inlet in stage 1 is to be connected with a certain outlet m the last stage. The traffic loss due to nonavailability of an idle path between the two points is called point-to-point loss or point loss. A traffic... View full abstract»

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  • Simultaneous Adaptive Estimation and Decision Algorithm for Carrier Modulated Data Transmission Systems

    Publication Year: 1971 , Page(s): 268 - 280
    Cited by:  Papers (90)  |  Patents (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1140 KB)  

    The problems of sequence decision, sample timing, and carrier phase recovery in a class of linear modulation data transmission systems are treated from the viewpoint of multiparameter estimation theory. The structure of the maximumlikelihood estimator is first obtained, and a decision-directed receiver is then derived. These receivers are different from the conventional one in that the carrier pha... View full abstract»

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  • An Adaptive Decision Feedback Equalizer

    Publication Year: 1971 , Page(s): 281 - 293
    Cited by:  Papers (57)  |  Patents (9)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1272 KB)  

    An adaptive decision feedback equalizer to detect digital information transmitted by pulse-amplitude modulation (PAM) through a noisy dispersive linear channel is described, and its performance through several channels is evaluated by means of analysis, computer simulation, and hardware simulation. For the channels considered, the performance of both the fixed and the adaptive decision feedback eq... View full abstract»

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  • Multipath Intermodulation Associated with Operation of FM-FDM Radio Relays in Heavily Built Areas

    Publication Year: 1971 , Page(s): 293 - 301
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (932 KB)  

    Microwave FM radio link paths concerning heavily built areas may be found to suffer from high amounts of intermodulation noise caused by multiple reflections on buildings and reflecting obstacles lying alongside the direction of propagation. Little direct information may be gained on these effects using standard techniques for measuring transmission performance. The limitations of those techniques... View full abstract»

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  • National Telephone Network Transmission Planning in the American Telephone and Telegraph Company

    Publication Year: 1971 , Page(s): 302 - 314
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1381 KB)  

    The transmission plan associated with the toll switching plan used by the American Telephone and Telegraph Company has evolved and will continue to change to take advantage of new technology in providing better transmission quality and new service capabilities. This paper describes the present network plan and quality controls that are applied. An indication is given of future trends that will aff... View full abstract»

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  • Six-Decibel Digital Attenuation

    Publication Year: 1971 , Page(s): 315 - 319
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (442 KB)  

    In the interest of future studies of digital echo suppressors operating directly on PCM words and of other possible future studies involving digital attenuation, a technique for 6-dB digital attenuation without linearization of the compressed PCM words from an 8-bit 15-segment compandor (μ = 255 law) is presented. The compandor is assumed to have midtread form at the origin, and all adjacent ... View full abstract»

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  • A Feedforward Experiment Applied to an L-4 Carrier System Amplifier

    Publication Year: 1971 , Page(s): 320 - 325
    Cited by:  Papers (22)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (832 KB)  

    As part of a test to determine its applicability to coaxial repeaters, a feedforward error-control system was applied to an L-4 coaxial system flat-gain amplifier operating in the frequency range of 0.5-20 MHz. The error amplifier was a duplicate to the main amplifier. With three test tones at 7.5 dBm output each applied within the last L-4 master group, modulation products in the uncompensated sy... View full abstract»

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  • Transmission Analysis of GT&E Customer Loop Plant

    Publication Year: 1971 , Page(s): 326 - 332
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (687 KB)  

    The transmission analysis of a sampling survey of the GT&E customer loop plant is presented. The analysis points out transmission weak points which will help in establishing guidelines for corrective action. Surveys of this type, when repeated two to five years later, will show the overall affects of transmission improvement programs and also point out any areas that may require further correc... View full abstract»

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  • Estimating Telephone Necessities in Developing Nations

    Publication Year: 1971 , Page(s): 333 - 339
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1010 KB)  

    The whole process of fundamental planning for a national telecommunication system is based on estimating and projecting accurately the demand for telephone connections. Traditional methods are inadequate when dealing with supplylimited markets, where there may be a large hidden demand. In such cases the first target may be to upgrade the system until it matches the socioeconomic level already atta... View full abstract»

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  • Topology and Transmission Rate Considerations in the Design of Centralized Computer-Communication Networks

    Publication Year: 1971 , Page(s): 339 - 344
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (721 KB)  

    The important parameters of network topology and data transmission rate are examined in the light of their effect on the design of centralized computer-communication networks. Existing algorithms for the design of centralized nets are reviewed and restrictions on their use are noted. Various methods for formulating performance constraints are presented and their suitability in the light of availab... View full abstract»

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  • The Effects of Quadratic AM-PM Conversion in Frequency-Division Multiplexed Multiple-Access Communication Satellite Systems

    Publication Year: 1971 , Page(s): 345 - 349
    Cited by:  Papers (8)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (441 KB)  

    A traveling-wave tube amplifier such as those employed in frequency-division multiplexed multiple-access communication-satellite repeaters is considered. The amplifier nonlinearity is assumed to follow an error-function characteristic, and the AM-PM conversion is taken to be a quadratic function of the envelope of the input signal. An exact expression allowing for both arbitrary amounts of amplifi... View full abstract»

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  • Multiplication by Square of Envelope as Means of Improving Detection Below FM Threshold

    Publication Year: 1971 , Page(s): 349 - 353
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (501 KB)  

    A theoretical analysis is presented of a novel form of FM demodulator where the FM signal is a flat band of Gaussian noise. The device offers an improvement over the demodulation capability of the conventional FM receiver in the region well below the threshold and the formulas governing its operation are simple, thus the manner in which changes in the modulation parameters Affect the performance c... View full abstract»

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  • Signal-To-Noise Ratios in Bandpass Deadzone Limiters

    Publication Year: 1971 , Page(s): 353 - 355
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (288 KB)  

    The solution for signal-to-noise ratio at the output of a deadzone-limiter narrow-band-filter combination when the input is a sine wave plus narrow-band Gaussian noise is presented. Expressions are derived for output signal and noise power as functions of input signal-to-noise ratio, signal-to-deadzone ratio, and noise-to-deadzone ratio. The resulting output signal-to-noise ratios are plotted for ... View full abstract»

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  • INTELSAT IV Satellite System (Voice) Channel Capacity Versus Earth-Station Performance

    Publication Year: 1971 , Page(s): 355 - 362
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (594 KB)  

    A comprehensive technical study has been performed to assess the optimum voice-channel capacity of a transponder as a function of the earth-station performance (ratio of receive antenna gain to system noise temperature) for various modulation techniques such as: a) single-carrier per transponder frequencydivision multiplexing frequency modulating (FDM/FM); b) multicarrier per transponder FDM/FM; c... View full abstract»

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  • Correction of Helium Speech Distortions by Real-Time Electronic Processing

    Publication Year: 1971 , Page(s): 362 - 364
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (366 KB)  

    The use of helium in breathing gas mixtures for deep diving operations causes marked changes in the speech sounds of the divers. The most prominent effect is an elevation of the formant frequencies which, in conjunction with other phenomena, progressively reduces speech intelligibility as depth increases. Our analyses and investigations have shown that to correct these distortions, the following m... View full abstract»

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  • On the Stability of a Double Integration Delta Modulator

    Publication Year: 1971 , Page(s): 364 - 366
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (269 KB)  

    A delta modulator with a second-order network in the feedback path is considered. For zero input signal the possible modes of oscillation are determined as a function of the zero of the linear network. The method could be employed with other types of feedback networks. A comparison is made with experimental results. View full abstract»

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  • Intelligible Crosstalk in Multiple-Carrier FM Systems with Amplitude Limiting and AM-PM Conversion

    Publication Year: 1971 , Page(s): 366 - 368
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (251 KB)  

    Intelligible crosstalk will occur in a multiple-carrier FM system when a gain slope versus frequency characteristic is followed by AM-PM conversion. This phenomenon can be particularly serious in a communication satellite repeater that utilizes a traveling-wave tube for output power amplification. A model that includes both amplitude saturation and AM-PM conversion is developed and the two-carrier... View full abstract»

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  • Matched Filters for Rectangular, Raised Cosine, and Half Sine Wave Signals

    Publication Year: 1971 , Page(s): 369 - 371
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (240 KB)  

    Practical constructions of matched filters for the typical waveshape of pulsed signals are shown. Each filter consists of a prefilter, delay line, and attenuator. The degraduation of output signal-to-noise ratio (SNR) due to loss factor in each prefilter is calculated. View full abstract»

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  • Video Bandwidth Compression by Multiplexing: Experimental Results

    Publication Year: 1971 , Page(s): 371 - 372
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (200 KB)  

    The principle of a system for video bandwidth compression by multiplexing was described in [1]. That scheme was applied to two-level images. Experimental results are given. Seven two-level images were multiplexed and a bandwidth compression by a factor of 2.6 was achieved. 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