Free-Space Optical Communications with Channel Shortening Filter and Viterbi Equalizer |
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Authors: | Sangwoo Lee Mohsen Kavehrad |
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Affiliation: | (1) Samsung Electronics, Dong Suwon, 416, Maetan-3dong, Yeongtong-gu, P.O. Box 105, Suwon-city, Gyeonggi-do, 443-742, Korea;(2) Department of Electrical Engineering, The Pennsylvania State University, The Center for Information and Communications Technology Research (CICTR), 229 Electrical Engineering West, University Park, PA 16802-2705, USA |
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Abstract: | This paper is about signal processing techniques for airborne free-space optical (FSO) wireless communications through clouds.
FSO channel is known to be accompanied by multi-scattering, which causes severe intersymbol interference. Unlike traditional
FSO systems relying on optical signal processing devices, this research paper investigates the feasibility of digital signal
processing schemes applied to FSO. By having a channel shortening equalizer (CSE or TEQ for time equalization) at the transmitter
and a Viterbi equalizer at the receiver, reliable communication at low-to-mid level optical thickness values is shown to be
feasible. We also propose how existing TEQ algorithms can be modified to fit into TEQ-in-transmitter configurations. Performance
is evaluated in BER, and compared with conventional equalizations. |
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