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Proceedings Paper

Demodulation of analog data in free-space optical communication systems using discrete wavelet transformation
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Paper Abstract

Atmospheric scintillation noise is a fundamental limitation of free space optical communications, as the decrease in signal-to-noise ratio reduces the range and/or bandwidth of the link. A technique employing dual wavelengths has previously been demonstrated to be effective in mitigating scintillation noise by using common mode rejection to remove co-channel noise. However, any practical implementation of this technique will include uncorrelated noise, e.g. amplifier and photodetector noise, which will not be removed. In this paper we consider the limitations that this imposes, and investigate the use of discrete wavelet transformation (DWT) to overcome them. Simulations are performed to validate the use of the DWT in the demodulation of the analog data in the presence of noise. Results of the experiments are presented.

Paper Details

Date Published: 1 September 2006
PDF: 13 pages
Proc. SPIE 6304, Free-Space Laser Communications VI, 630405 (1 September 2006); doi: 10.1117/12.679062
Show Author Affiliations
Nader Namazi, Catholic Univ. of America (United States)
Kenneth Grant, Defense Science and Technology Org. (Australia)
Ray Burris, Research Support Instruments, Inc. (United States)
Christopher Moore, Naval Research Lab. (United States)
Rita Mahon, Titan Corp. (United States)
William Rabinovich, Naval Research Lab. (United States)
G. Charmaine Gilbreath, Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 6304:
Free-Space Laser Communications VI
Arun K. Majumdar; Christopher C. Davis, Editor(s)

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