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

Nader Namazi; Kenneth Grant; Ray Burris; Christopher Moore; Rita Mahon; William Rabinovich; G. Charmaine Gilbreath

doi:10.1117/12.679062

1 September 2006 Demodulation of analog data in free-space optical communication systems using discrete wavelet transformation

Nader Namazi, Kenneth Grant, Ray Burris, Christopher Moore, Rita Mahon, William Rabinovich, G. Charmaine Gilbreath

Author Affiliations +

Proceedings Volume 6304, Free-Space Laser Communications VI; 630405 (2006) https://doi.org/10.1117/12.679062
Event: SPIE Optics + Photonics, 2006, San Diego, California, United States

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.

Citation Download Citation

Nader Namazi, Kenneth Grant, Ray Burris, Christopher Moore, Rita Mahon, William Rabinovich, and G. Charmaine Gilbreath "Demodulation of analog data in free-space optical communication systems using discrete wavelet transformation", Proc. SPIE 6304, Free-Space Laser Communications VI, 630405 (1 September 2006); https://doi.org/10.1117/12.679062

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