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  • 1
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    Two hybrid ARQ error control schemes for near Earth satellite communications (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Two hybrid Automatic Repeat Request (ARQ) error control schemes are proposed for NASA near Earth satellite communications. Both schemes are adaptive in nature, and employ cascaded codes to achieve both high reliability and throughput efficiency for high data rate file transfer.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-177179 , NAS 1.26:177179 , TR-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    On the undetected error probability for shortened Hamming codes (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Shortened Hamming codes are widely used for error detection in data communications. In this paper, a method for computing the probability of an undetected error for these codes is presented. This method is then used to evaluate the error-detection performance of the shortened codes obtained from the two distance-four Hamming codes adopted by CCITT X.25 for error control for packet-switched networks. It is shown that shortening a code does affect its error-detection performance.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Communications (ISSN 0090-6778); COM-33; 570-574
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A concatenated coding scheme for error control (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: In this paper, a concatenated coding scheme for error control in data communications is presented and analyzed. In this scheme, the inner code is used for both error correction and detection; however, the outer code is used only for error detection. A retransmission is requested if either the inner code decoder fails to make a successful decoding or the outer code decoder detects the presence of errors after the inner code decoding. Probability of undetected error (or decoding error) of the proposed scheme is derived. An efficient method for computing this probability is presented. Throughput efficiency of the proposed error control scheme incorporated with a selective-repeat ARQ retransmission strategy is also analyzed. Three specific examples are presented. One of the examples is proposed for error control in the NASA Telecommand System.
    Keywords: COMMUNICATIONS AND RADAR
    Type: IEEE Transactions on Communications (ISSN 0090-6778); COM-34; 481-488
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Coding for reliable satellite communications (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This research project was set up to study various kinds of coding techniques for error control in satellite and space communications for NASA Goddard Space Flight Center. During the project period, researchers investigated the following areas: (1) decoding of Reed-Solomon codes in terms of dual basis; (2) concatenated and cascaded error control coding schemes for satellite and space communications; (3) use of hybrid coding schemes (error correction and detection incorporated with retransmission) to improve system reliability and throughput in satellite communications; (4) good codes for simultaneous error correction and error detection, and (5) error control techniques for ring and star networks.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-177262 , NAS 1.26:177262
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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