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  • COMMUNICATIONS  (3)
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  • 1
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    Multipath modeling for aeronautical communications. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: One of the fundamental technical problems in aeronautical digital communications is that of multipath propagation between aircraft and ground terminal. This paper examines in detail a model of the received multipath signal that is useful for application of modern detection and estimation theories. The model treats arbitrary modulation and covers the selective and nonselective cases. The necessarily nonstationary statistics of the received signal are determined from the link geometry and the surface roughness parameters via a Kirchhoff solution.
    Keywords: COMMUNICATIONS
    Type: IEEE Transactions on Communications; COM-21; May 1973
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    On the technology of aerospace communication in multipath. (1972)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The mechanism, effects, and modelling of multipath propagation, caused by rough earth reflection, are examined for aerospace communication. Emphasis is on binary digital signalling for aircraft and hybrid vehicles, such as Shuttle. The cases of direct Air-Ground and satellite relay (Aerosat) are treated. The recursive, adaptive, coherent Bayes detector for binary phase-shift-keying in nonselective multipath is presented. The derivation for the frequency-shift-keying detector is indicated.
    Keywords: COMMUNICATIONS
    Type: NTC ''72; National Telecommunications Conference; Dec 04, 1972 - Dec 06, 1972; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Simulation results for an innovative anti-multipath digital receiver (1973)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Simulation results are presented for the error rate performance of the recursive digital MAP detector for known M-ary signals in multiplicative and additive Gaussian noise. Plots of detection error rate versus additive signal to noise ratio are given, with multipath interference strength as a parameter. For comparison, the error rates of conventional coherent and noncoherent digital MAP detectors are simultaneously simulated and graphed. It is shown that with nonzero multiplicative noise, the error rates of the conventional detectors saturate at an irreducible level as additive signal to noise ratio increases. The error rate for the innovative detector continues to decrease rapidly with increasing additive signal to noise ratio. In the absence of multiplicative interference, the conventional coherent detector and the innovative detector are shown to exhibit identical performance.-
    Keywords: COMMUNICATIONS
    Type: International Telemetering Conference; Oct 09, 1973 - Oct 11, 1973; Washington, DC
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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