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Proceedings Paper

Laboratory implementation of an adaptive thresholding system for free-space optical communication receivers with signal dependent noise
Author(s): H. R. Burris; C. I. Moore; L. A. Swingen; L. M. Wasiczko; R. Mahon; M. F. Stell; M. R. Suite; W. S. Rabinovich; J. L. Murphy; G. C. Gilbreath; W. J. Scharpf
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Paper Abstract

The optimum detection threshold for optical communication receivers with large signal-dependant noise components can be derived from a Bayes' Likelihood Ratio Test; however, the bit level statistics must be known a priori. In free-space communication systems, atmospheric conditions cause variations in optical transmission and subsequently in the bit level means and variances. These bit parameters must be tracked, estimated, and predicted, in order to update the detection threshold at a rate greater than the frequency of atmospheric changes. A laboratory implementation of an adaptive thresholding system is being implemented at the U.S. Naval Research Laboratory's Chesapeake Bay Free-space Lasercom Testbed. Early results of experiments underway and initial design of the system will be presented.

Paper Details

Date Published: 12 September 2005
PDF: 20 pages
Proc. SPIE 5892, Free-Space Laser Communications V, 58920W (12 September 2005); doi: 10.1117/12.622298
Show Author Affiliations
H. R. Burris, Research Support Instruments, Inc (United States)
C. I. Moore, Naval Research Lab. (United States)
L. A. Swingen, Naval Research Lab. (United States)
L. M. Wasiczko, Naval Research Lab. (United States)
R. Mahon, The Titan Corp. (United States)
M. F. Stell, Research Support Instruments, Inc. (United States)
M. R. Suite, Naval Research Lab. (United States)
W. S. Rabinovich, Naval Research Lab. (United States)
J. L. Murphy, Naval Research Lab. (United States)
G. C. Gilbreath, Naval Research Lab. (United States)
W. J. Scharpf, Naval Research Lab. (United States)

Published in SPIE Proceedings Vol. 5892:
Free-Space Laser Communications V
David G. Voelz; Jennifer C. Ricklin, Editor(s)

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