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  • 1
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    Word and frame synchronization with verification for PPM optical communications (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A method for obtaining word and frame synchronization in pulse position modulated optical communication systems is described. The method uses a short sync sequence inserted at the beginning of each data frame and a verification procedure to distinguish between inserted and randomly occurring sequences at the receiver. This results in an easy to implement sync system which provides reliable synchronization even at high symbol error rates. Results are given for the application of this approach to a highly energy efficient 256-ary PPM test system.
    Keywords: COMMUNICATIONS AND RADAR
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    NASA TECHNICAL REPORTS
  • 2
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    Simple method for designing or analyzing an optical communication link (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A simple method is described for determining the performance of a free space optical communication link. The method can be used either in the system design (synthesis) mode, or in the performance evaluation (analysis) mode. Although restricted to photo counting based detection (e.g., photomultiplier tube or equivalent) of pulse position modulated signals, the method is still sufficiently general to accommodate space-based, as well as ground-based, reception.
    Keywords: COMMUNICATIONS AND RADAR
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    NASA TECHNICAL REPORTS
  • 3
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    Transmitter pointing loss calculation for free-space optical communications link analyses (1987)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: In calculating the performance of free-space optical communications links, the transmitter pointing loss is one of the two most important factors. It is shown in this paper that the traditional formula for the instantaneous pointing loss (i.e., for the transmitter telescope far-field beam pattern) is quite inaccurate. A more accurate and practical approximation is developed in which the pointing loss is calculated using a Taylor series approximation. The four-term series is shown to be accurate to 0.1 dB for the theta angles not greater than 0.9 lambda/D (wavelength/telescope diameter).
    Keywords: COMMUNICATIONS AND RADAR
    Type: Applied Optics (ISSN 0003-6935); 26; 2055-205
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    NASA TECHNICAL REPORTS
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