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IEEE Transactions on Communications

Issue 1 • January 1981

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Displaying Results 1 - 17 of 17
  • [Front cover and table of contents]

    Publication Year: 1981, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (256 KB)
    Freely Available from IEEE
  • A Comparison of Four Methods for Analog Speech Privacy

    Publication Year: 1981, Page(s):18 - 23
    Cited by:  Papers (30)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (654 KB)

    Four well-known procedures for analog speech privacy have been compared in terms of residual intelligibility, bandwidth expansion, and encoding delay. Intelligibility scores have been determined from a perceptual experiment where about 70 untrained listeners were given the task of recognizing each of 200 spoken digits that occurred in a balanced set of 50 encrypted four-digit utterances, and by av... View full abstract»

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  • Block Error Probability for Noncoherent FSK with Diversity for Very Slow Rayleigh Fading in Gaussian Noise

    Publication Year: 1981, Page(s):57 - 60
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (375 KB)

    Expressions are derived for the average probability of block errorP_{f}(M, N), i.e., the probability of more thanMerrors in a block ofNsymbols. The average is formed over the inatantaneous receiver signal-to-noise ratio after combining. Binary frequency-shift keying with noncoherent detection is transmitted over a very slow nonselective Rayleigh fading channel and ... View full abstract»

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  • Determination of phase-locked loop statistics with the aid of RLC ladder networks

    Publication Year: 1981, Page(s):73 - 79
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (483 KB)

    Transient behavior of the first-order phase-locked loop (PLL) in the presence of noise is investigated. A Fourier series with time varying coefficients is used to represent the modulo-2π phase error probability density function (pdf) in order to solve the Fokker-Planck equation. Solutions for the Fourier coefficients are obtained via simulatingRLCladder networks with special elemen... View full abstract»

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  • Corrections to "A two-level coarse code acquisition scheme for spread spectrum radio"

    Publication Year: 1981, Page(s): 80
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (130 KB)

    Equations (10) and (16) of the above-named work (ibid., vol. COM-28, Part 11, pp. 1734-1742, Sept. 1980) are corrected. View full abstract»

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  • [Back cover]

    Publication Year: 1981, Page(s): 0
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    Freely Available from IEEE
  • A Two-Dimensional Quantizer for Coding of Digital Imagery

    Publication Year: 1981, Page(s):60 - 67
    Cited by:  Papers (4)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    A spatial domain image coding method which is computationally straightforward and requires only one pass through the incoming data is presented. The technique is based on approximating a near-optimal three-level uniform quantizer over a spatially local region of the image. This method can maintain single pixel resolution and is therefore applicable to wide bandwidth data. Results of applying this ... View full abstract»

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  • Switching Performance of a 12 GHz p-i-n Phase Shifter/Driver Module for Satellite Communication Phased Array

    Publication Year: 1981, Page(s):46 - 50
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The design and implementation of a high-speed, lowpower, and TTL-compatible driver for a 12 GHz digital p-i-n phase shifter are shown. The switching performance of the phase shifter, combined with its driver in a compact module, is presented. Measurements of 40 phase shifter/driver modules show that the longest time required to change phase states (switching time) is under 8 ns. The maximum drivin... View full abstract»

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  • Distributed Algorithms for Generating Loop-Free Routes in Networks with Frequently Changing Topology

    Publication Year: 1981, Page(s):11 - 18
    Cited by:  Papers (144)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    We consider the problem of maintaining communication between the nodes of a data network and a central station in the presence of frequent topological changes as, for example, in mobile packet radio networks. We argue that flooding schemes have significant drawbacks for such networks, and propose a general class of distributed algorithms for establishing new loop-free routes to the station for any... View full abstract»

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  • An Improved Stop-and-Wait ARQ Logic for Data Transmission in Mobile Radio Systems

    Publication Year: 1981, Page(s):68 - 71
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    An efficient Automatic-Repeat-Request (ARQ) logic, for use in systems with high error rate two-frequeney-simplex data channels, is proposed. The throughput efficiency provided by this logic is compared with that of conventional "stop-and-wait" ARQ, and a significant improvement is shown to be available. Particular emphasis is placed on the use of this logic for data transmission to mobile land veh... View full abstract»

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  • Digital Microcommutators: Structure and Application

    Publication Year: 1981, Page(s):3 - 10
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (840 KB)

    Semiconductor technology achievements have opened up prospects for the development of integrated digital communication networks. Special LSI's have become a base element of communication means. Here, an approach is described for special LSI'sdesigned in the form of functionally complete communication systems of limited capacity-the microcommutators. The microcommutator contains all the subsystems ... View full abstract»

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  • The Effect of a Large Signal Upon a Small Signal in a Memoryless Nonlinear Bandpass Amplifier

    Publication Year: 1981, Page(s):72 - 73
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    Despite the presence of AM-to-AM conversion, AM-to-PM conversion, and a strong interfering signal, a weak signal emerges undistorted from a memoryless nonlinear bandpass amplifier, suffering only a constant phase shift. A recent result of Chang and Shimbo concerning this situation is here clarified with the aid of a simpler, more direct derivation, which also yields the third-order intermodulation... View full abstract»

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  • Counter Synchronization Using the Thue-Morse Sequence and PSK

    Publication Year: 1981, Page(s):79 - 80
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The Thue-Morse sequence (TMS), the "parity check" sequence formed on a normal binary counter, has been proposed as a vehicle for comma-free synchronizatin of binary counters. This note reports further work on the TMS as a vehicle for commafree synchronization of binary counters. Specifically, we present a new synchronization algorithm and a way to implement the algorithm via PSK encoding/DPSK deco... View full abstract»

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  • A Nonuniform Sampling Approach to Data Compression

    Publication Year: 1981, Page(s):24 - 32
    Cited by:  Papers (96)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (800 KB)

    A nonuniform sampling approach to digital encoding of analog sources is proposed. The nonuniform sampler is basically a level crossing detector (LCD) which produces a sample whenever the input to the LCD crosses a threshold level. The information about the source signal is contained in the time intervals between level crossings and in the directions of level crossings. By assigning strings of the ... View full abstract»

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  • Feedback Communications over Fading Channels

    Publication Year: 1981, Page(s):50 - 57
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    A communication system using noiseless feedback for Rayleigh fading channels is proposed. Pilot tone signaling is used to provide channel amplitude and phase information for the detection of antipodal signals. Channel estimates generated in the receiver are fed back to control the transmitter power and rate. Power division and rate control rules are derived, and it is shown that definite performan... View full abstract»

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  • Radio System Interference from Geostationary Satellites

    Publication Year: 1981, Page(s):33 - 40
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    Geostationary communications satellites have a potential for causing interference into terrestrial radio relay systems since present INTELSAT satellites as well as a number of U.S. domestic satellites transmit a downlink frequency in the 4 GHz common carrier band. Use has been made of recently measured spatial antenna radiation patterns of the AT&T KS15676 pyramidal horn-reflector antenna to c... View full abstract»

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  • Optimizing Optical Transmitters and Receivers for Transmitting Multichannel Video Signals Using Laser Diodes

    Publication Year: 1981, Page(s):41 - 45
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Analog transmission using laser diodes is quite attractive for transmitting multiplexed video signals, owing to the wide modulation bandwidth of laser diodes. Optimizations for transmitting color-TV signals (7 channel frequency division multiplexed) in the VHF band using buried heterostructure laser diodes are investigated. The major transmission objectives are a carrier to noise ratio of larger t... View full abstract»

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Aims & Scope

IEEE Transactions on Communications focuses on all telecommunications including telephone, telegraphy, facsimile, and point-to-point television by electromagnetic propagation.

 

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Naofal Al-Dhahir
University of Texas at Dallas