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An Adaptive Threshold Detector and Channel Parameter Estimator for Deep Space Optical Communications
 

Summary: An Adaptive Threshold Detector and Channel Parameter Estimator
for Deep Space Optical Communications
R. Mukai, P. Arabshahi, T.-Y. Yan
Jet Propulsion Laboratory
4800 Oak Grove Drive, MS 238343
Pasadena, CA 91109 USA
mukai,payman,yan @jpl.nasa.gov
Abstract-- A method for optimal adaptive setting of pulse-position-
modulation pulse detection thresholds, which minimizes the total prob-
ability of error for the dynamically fading optical free space channel, is
presented. The threshold's adaptive setting, in response to varying chan-
nel conditions, results in orders of magnitude improvement in probability
of error, as compared to use of a fixed threshold. The adaptive threshold
system itself is based on a robust channel identification system that uses
average signal strengths to estimate the degree of fade and total attenu-
ation in the channel, and a radial basis function network for estimating
pulse spreads, all with excellent accuracy.
I. INTRODUCTION
Over the past years, NASA and JPL have continuously
sought to reduce spacecraft size and mass while increasing its

  

Source: Arabshahi, Payman - Applied Physics Laboratory & Department of Electrical Engineering, University of Washington at Seattle

 

Collections: Engineering