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IEEE Transactions on Communication Technology

Issue 2 • Date April 1969

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Displaying Results 1 - 25 of 32
  • [Front cover and table of contents]

    Publication Year: 1969, Page(s): 0
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    Freely Available from IEEE
  • An Electrically Alterablc NDRO Memory System Using a Twistor

    Publication Year: 1969, Page(s):93 - 99
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (846 KB)

    This paper describes the essential features of a digital store developed at the Bell Telephone Laboratories. It is part of a computer-like control system that will be used in telephone switching applications. The paper covers the memory device (Piggyback Twistor), read and write techniques, circuits for driving and sensing, the broad system, and finally maintenance philosophy and a cost analysis. View full abstract»

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  • On-Line Retrofitting of Electronic Switching Systems

    Publication Year: 1969, Page(s):99 - 103
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    In order to hasten the development of electronic switching in the Bell System, the first two No. 1 Electronic Switching Systems (No. 1 ESS) were placed into service without benefit of a field trial. Based upon experience gained in these early offices, hardware and program modifications were made prior to placing subsequent offices into service. This paper describes the program, hardware, and trans... View full abstract»

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  • Optimum Routing Strategies for Noisy Communication Networks

    Publication Year: 1969, Page(s):104 - 118
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1509 KB)

    In this paper we study optimum routing strategies that minimize the degrading effects of system noise in noisy communication networks. Previous papers have treated problems related to finding an optimum single communication path through a network; we consider the problem of establishing several communication paths simultaneously. Networks with fixed link characteristics and networks with links tha... View full abstract»

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  • Field-Test Results of the AN/GSC-10 (KATHRYN) Digital Data Terminal

    Publication Year: 1969, Page(s):118 - 128
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1072 KB)

    The AN/GSC-10 (KATHRYN) is a digital data terminal for use on high-frequency radio circuits. In this paper, error rate and redundancy performance are discussed. Experimental data resulting from a cross-country field test are presented. View full abstract»

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  • Digital data transmission via troposcatter channels [Intro to following five papers]

    Publication Year: 1969, Page(s): 129
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (77 KB)

    The publication as a set of a series of papers prepared by, or under the direction of, a single author, albeit a recognized expert, requires an explanation and an introduction. Too infrequently does a sponsored study program permit investigation of a technical subject to the depth necessary for the development of an adequate treatment in technical paper form. Dr. Bello's capability as a program ma... View full abstract»

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  • A Troposcatter Channel Model

    Publication Year: 1969, Page(s):130 - 137
    Cited by:  Papers (29)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (804 KB)

    Using some basic results in propagation theory, a single integral is derived which relates the channel delay power spectrum to the geometry and antenna patterns of the troposcatter link. Theoretical curves of delay power spectra and frequency correlation functions are presented for medium- and long-distance troposeatter links. View full abstract»

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  • Selection of Multichannel Digital Data Systems for Troposcatter Channels

    Publication Year: 1969, Page(s):138 - 161
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2687 KB)

    This paper presents an exposition of the role of power and bandwidth utilization considerations in the selection of communication techniques for troposcatter channels. The comparative power utilization efficiencies of a large number of techniques are considered both from the point of view of utilizing transmitter prime power and from the point of view of effectively using the actual received power... View full abstract»

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  • A Class of Efficient High-Speed Digital Modems for Troposcatter Links

    Publication Year: 1969, Page(s):162 - 183
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1968 KB)

    A class of power and bandwidth efficient high-speed digital data modems is described and corresponding theoretical error rate performances presented as a function of signal-to-noise ratio for a range of typical links. View full abstract»

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  • Error Rates in Diversity FDM-FM Digital Troposcatter Transmission

    Publication Year: 1969, Page(s):183 - 191
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (788 KB)

    This paper evaluates the error probabilities due to both additive noise and frequency selective fading for predetection diversity combining FDM-FM systems using the troposcatter channel. Graphical results are presented for channel and modulation parameters of typical links. View full abstract»

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  • Performance of an Energy Detection FSK Digital Modem for Troposcatter Links

    Publication Year: 1969, Page(s):192 - 200
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    This paper presents simulation-derived system parameters and error probabilities of a frequency cycling binary FSK energy detection troposcatter system. Included are effects of additive noise, intersymbol and intrasymbol interference, frequency selective fading, and multiple diversity. View full abstract»

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  • The Spectrum of a High-Index FM Waveform: Woodward's Theorem Revisited

    Publication Year: 1969, Page(s):201 - 208
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (740 KB)

    Woodward's theorem asserts that the spectrum of a high-index frequency-modulated (FM) waveform is approximately the probability distribution of its instantaneous frequency, i.e., the univariate distribution of the modulating wave shifted by the carrier frequency. A new proof is presented which for the first time includes an upper bound on the error of this approximation and thus shows under what c... View full abstract»

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  • M-ary Poisson Detection and Optical Communications

    Publication Year: 1969, Page(s):208 - 216
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (902 KB)

    This paper presents an investigation of the problem of maximum likelihood detection of one of M Poisson processes in a background of additive Poisson noise. When the observables correspond to counts of emitted photoelectrons, the problem models a discrete version of a coherent M -ary optical communication system using photon... View full abstract»

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  • Block Coding for Space Communications

    Publication Year: 1969, Page(s):217 - 225
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (791 KB)

    A theory for use in the design of block-coded telemetry systems is delineated. This theory is useful in designing and testing the performance of one- and two-way phase-coherent telemetry systems when a phase-locked receiver preceded by a bandpass limiter is used to track the modulation. System analysis for either orthogonal or biorthogonal codes is given. Design trends, relating the various system... View full abstract»

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  • A New Representation Theory and Detection Procedures for a Class of Non-Gaussian Channels

    Publication Year: 1969, Page(s):225 - 234
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1071 KB)

    In this paper, a new representation theory that provides an improved description of the channel statistics of multihop and tropospheric scatter communication links is presented. Two conceptually different representations are developed. These representations, which are based on the deviations from a lognormal distribution, are due to the variable skewness of the lognormal distribution, extremely fl... View full abstract»

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  • Analytical Model of Half-Duplex Interconnections of Computers

    Publication Year: 1969, Page(s):235 - 238
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (410 KB)

    Computer interconnections allowing half-duplex data communications have been analyzed using a single-server dualqueue model. Storage usage for message queuing at each computer and associated message delays are considered as functions of communications parameters. View full abstract»

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  • Servicing Losses in Large Data Collection Systems

    Publication Year: 1969, Page(s):239 - 244
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (557 KB)

    This paper presents an analysis of large information collection systems. The method employed consists of evaluating the probability of the system losing information due to overloading the receiving system with signals to be processed. Performance characteristics are derived that relate the probability of lost or incompletely processed signals versus the number of servicing receivers and mean arriv... View full abstract»

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  • Correlation Measurements on an HF Transmission Link

    Publication Year: 1969, Page(s):245 - 256
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1071 KB)

    In data transmission over long-haul HF circuits, the signal is subjected to the vagaries of a turbulent ionospheric medium. To permit accurate performance predictions it is necessary to obtain a comprehensive channel description. This paper describes a program designed to achieve two goals. 1) To determine the feasibility of performing an experiment with sufficient accuracy to determine the time-v... View full abstract»

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  • Frequency Synthesizers-A Survey of Techniques

    Publication Year: 1969, Page(s):257 - 271
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1587 KB)

    A general survey is given of the different synthesizer techniques with emphasis on the application in communication equipment. After enumeration of the fundamental concepts of addition and multiplication, the different systems are examined and classified. This leads to the conclusion that for high requirements of spectral purity of the output signal, electronic tuning, solid-state design, and micr... View full abstract»

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  • The TH-3 Microwave Radio Transmitter-Receiver

    Publication Year: 1969, Page(s):271 - 276
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (860 KB)

    A new transmitter-receiver for use in 6-GHz microwave radio relay systems is described. Utilizing all solid-state devices except for the output amplifier (traveling-wave tube), the noise objective is 11,000 pW (psophometric) for a message load of 1800 circuits for a 4000-mile system. The system was designed to use many components and associated auxiliary systems in common with the new 4-GHz solid-... View full abstract»

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  • Comparison of an Energy Density Antenna System with Predetection Combining Systems for Mobile Radio

    Publication Year: 1969, Page(s):277 - 284
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    A comparison is made of the statistical properties of energy density reception of mobile radio signals with those of multichannel predetection combining diversity reception using an array of whip antennas lined up transverse to the direction of motion. Theoretically, the energy density system is about as effective as a 3-channel diversity system in reducing fading. This conclusion was obtained fro... View full abstract»

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  • Analysis of a Spread-Spectrum Multiple-Access System with a Hard Limiter

    Publication Year: 1969, Page(s):285 - 290
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (575 KB)

    The detectability parameter (signal-to-noise ratio) at the output of a correlation detector is computed when the input is the hard-limited sum of a number of pseudonoise (PN) carriers plus noise. All pseudonoise carriers have the same amplitude and center frequency, but are phase modulated with different PN codes and have independent phase angles. The detectability parameter depends on the repeate... View full abstract»

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  • Quantizing for Noisy Channels

    Publication Year: 1969, Page(s):291 - 302
    Cited by:  Papers (75)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (955 KB)

    We consider the transmission of numerical data over a noisy channel. Two sources of error exist. The first is the quantizer where the input data is mapped into a finite set of rational numbers and the second is the channel which includes the encoder, transmitter, transmission medium, receiver, and decoder. For any given probability density on the input data and any given channel matrix, we determi... View full abstract»

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  • Bipolar Pulse Transmission with Zero Extraction

    Publication Year: 1969, Page(s):303 - 310
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (671 KB)

    A family of pulse transmission plans, suitable for wire pair or coaxial repeatered lines is described. In these plans alternate pulses are inverted before transmission, and blocks of n successive spaces are replaced by distinctive patterns. The resulting pulse stream has no dc component and a minimum pulse density of 1/n . ... View full abstract»

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  • The N3-L Junction for Providing the Interconnection of Long- and Short-Haul Carrier Systems on a Group Basis

    Publication Year: 1969, Page(s):311 - 317
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (942 KB)

    The need for dedicated telephone circuits between small population centers, geographically separated by large distances, is on the increase. The present practice of interconnecting long- and short-haul carrier systems at voice frequency to provide these circuits is inefficient and costly. The N3-L junction provides this interconnection on a group basis, thereby eliminating the costly channelizing ... View full abstract»

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Aims & Scope

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

Full Aims & Scope