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IEEE Transactions on Communications

Issue 12 • Date December 1977

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Displaying Results 1 - 16 of 16
  • [Front cover and table of contents]

    Publication Year: 1977, Page(s): 0
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    Freely Available from IEEE
  • A multiple stack algorithm for erasurefree decoding of convolutional codes

    Publication Year: 1977, Page(s):1460 - 1470
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (954 KB)

    A new algorithm for erasurefree sequential decoding of convolutional codes is introduced which achieves low error probabilities at substantially higher decoding speeds than the Viterbi decoding algorithm. The algorithmic properties of the Multiple Stack Algorithm (MSA) are investigated and it is demonstrated that the MSA reaches a decision with an exponentially rather than Pareto distributed compu... View full abstract»

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  • Correction to "Low-Rate Convolutional Code Applications in Spread-Spectrum Communications"

    Publication Year: 1977, Page(s):1507 - 1508
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (209 KB)

    First Page of the Article
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  • [Back cover]

    Publication Year: 1977, Page(s): 0
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    Freely Available from IEEE
  • Self Synchronizing Digital Scramblers

    Publication Year: 1977, Page(s):1505 - 1507
    Cited by:  Papers (2)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    A known way of scrambling binary data for security purposes is by adding to it, bit by bit, a pseudorandom sequence A. Synchronization is established by providing the descrambler with the states of A's generator. It is shown here how for data transmitted in blocks, the states of the generator can be recovered at any instant which enables self-synchronization. If the block length is View full abstract»

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  • Atmospheric Optical Communication System

    Publication Year: 1977, Page(s):1508 - 1511
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The prototype atmospheric optical communication system has been developed, and various field tests have been carried out in Tokyo and Niigata. The system with a laser diode can transmit a 4-MHz color television signal or 120 telephone channels. This paper gives an outline description of system design based on field test results. View full abstract»

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  • Rehoming Strategies for a Relief Toll Machine

    Publication Year: 1977, Page(s):1448 - 1453
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    When an existing toll machine exhausts and a relief toll machine is added, rehoming of existing trunk groups is necessary. The intent of this paper is to determine rehoming programs whereby the present worth of the total trunk rearrangement cost is minimized while the total number of trunks to be rearranged at any stage of the program is constrained to lie within specified lower and upper limits. ... View full abstract»

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  • Estimation of the Signal-to-Noise Ratio in High Information and Constant Factor Delta Modulation Systems

    Publication Year: 1977, Page(s):1441 - 1448
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    A "statistical average step size," γav, which is a function of the rms power of a band-limited white Gaussian input signal, is defined for high information and first order constant factor delta modulation systems. The signal-to-noise ratios (SNR) are then calculated for these instantaneously adaptive delta modulation systems by substituting γavfor the fixed step siz... View full abstract»

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  • Analysis of a Packet-Switched Network with End-to-End Congestion Control and Random Routing

    Publication Year: 1977, Page(s):1485 - 1489
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    This concise paper extends the results of Pennotti and Schwartz by proposing a queueing model of a communication network with random routing and end-to-end congestion control. Using conventional performance criteria, the performance of this model is compared with that of a previously published model, where fixed routing was employed. View full abstract»

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  • Maximum A Posteriori Estimator for Suppression of Interchannel Interference in FM Receivers

    Publication Year: 1977, Page(s):1480 - 1485
    Cited by:  Papers (19)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    In this paper an FM detector capable of suppressing the degradation in receiver performance due to the presence of an interfering signal is presented. Optimum receiver structures based on maximum-aposteriori estimation procedures are first derived and then a practical demodulator based on the optimum receivers is examined. The receiver consists of two phase-locked loops (PLL) interconnected in a m... View full abstract»

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  • Troposcatter Test Results for a High-Speed Decision-Feedback Equalizer Modem

    Publication Year: 1977, Page(s):1499 - 1504
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A digital data modem which can operate at 1.5, 3.1, 6.3, 9.4, or 12.6 Mbit/s has been developed under the Megabit Digital Troposcatter Subsystem (MDTS) program for operation over Defense Communications System troposcatter links. An adaptive decisionfeedback equalizer (DFE) is used in the demodulator to eliminate intersymbol interference, combine diversity channels, and augument the existing divers... View full abstract»

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  • Improving Frequency Acquisition of a Costas Loop

    Publication Year: 1977, Page(s):1453 - 1459
    Cited by:  Papers (34)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A Costas loop for tracking a BPSK signal does not acquire when the initial frequency error is comparable to the loop bandwidth. This paper describes methods for deriving control proportional to frequency error so as to improve the frequency acquisition capability by an AFC augmentation. A composite AFC/Costas loop is realized by combining the individual loops. Pull-in from a frequency error much g... View full abstract»

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  • A New 90° Constant Phase Shifter for the VHF Band

    Publication Year: 1977, Page(s):1477 - 1480
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    This concise paper presents the realization of a 90°constant phase shifter in the VHF band, which is entirely different from the conventional method for the realization of constant phase shifters in the audio frequency range. The construction of the 90° constant phase shifter is simple and can be easily realized by using a transmission line, and the lumped constant elements, R, L, C. Exp... View full abstract»

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  • Delay Analysis of a Time Division Multiple Access (TDMA) Channel

    Publication Year: 1977, Page(s):1489 - 1494
    Cited by:  Papers (58)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The delay performance of a Time Division Multiple Access (TDMA) channel for transmitting data messages is considered. The channel is assumed to be fixed assigned to a station with unlimited buffer capacity and Poisson message arrivals. Each message gives rise to one or more packets for transmission into fixed-length time slots. The steady-state probability generating function of the queue size is ... View full abstract»

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  • Dependent Failures in Data Communication Systems

    Publication Year: 1977, Page(s):1494 - 1499
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    Although almost all published analyses of the reliability of communication systems assume failures of different lines are independent, such failures are actually highly correlated. A description of why this is true is given. This is followed by an approximate theoretical analysis of some measurement data. Both approaches yield the inescapable conclusion that assuming failures of different communic... View full abstract»

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  • On Mean-Square Decision Feedback Equalization and Timing Phase

    Publication Year: 1977, Page(s):1471 - 1476
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    We analyze the effect of timing phase on the performance of digital data receivers which employ decision feedback equalization. It has long been conjectured, and verified by computer simulations, that decision feedback equalizers are considerably less sensitive to the choice of timing phase than are conventional transversal linear equalizers. We develop the theoretical machinery which provides a r... 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