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Proceedings Paper

Channel estimation for free-space optical communications: preliminary experimental results and analysis
Author(s): Colin N. Reinhardt; Yasuo Kuga; James Ritcey; Akira Ishimaru; Stephen Hammel; Dimitris Tsintikidis
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Paper Abstract

We present some preliminary results from our recent free-space optical communications field test experiments in the foggy littoral environment along the coast of Point Loma, San Diego, conducted between October 2009 and June 2010. Our custom-built 850nm lasercomm system uses on-off keyed non-return-to-zero intensity-modulation and direct-detection to transmit pseudo-random bit sequences (PN-11 codes) at 250 Mbps over a 300m horizontal atmospheric path. We investigate improvements offered by using the latest Advanced Navy Aerosol Model to calculate the aerosol size-distribution function, a fundamental input to the radiative transfer code which we use to generate an estimate of the channel frequency response/impulse-response function. The estimated channel response function is used to design an equalization filter to correct signal distortion due to multiple-scattering effects and additive noise. We compare the performance of the Advanced Navy Aerosol Model against the more simplistic log-normal, Gaussian, and Mooradian Pt. Loma distributions. In this conference proceeding manuscript we are presenting only preliminary findings of our work in progress. Additional analysis, verification, and study is required before any final results can be posited from these preliminary findings.

Paper Details

Date Published: 24 August 2010
PDF: 10 pages
Proc. SPIE 7814, Free-Space Laser Communications X, 78140O (24 August 2010); doi: 10.1117/12.859917
Show Author Affiliations
Colin N. Reinhardt, Univ. of Washington (United States)
Yasuo Kuga, Univ. of Washington (United States)
James Ritcey, Univ. of Washington (United States)
Akira Ishimaru, Univ. of Washington (United States)
Stephen Hammel, Space and Naval Warfare Systems Ctr., San Diego (United States)
Dimitris Tsintikidis, Space and Naval Warfare Systems Ctr., San Diego (United States)

Published in SPIE Proceedings Vol. 7814:
Free-Space Laser Communications X
Arun K. Majumdar; Christopher C. Davis, Editor(s)

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