TY - JOUR
T1 - Free-space optical communications with channel shortening filter and viterbi equalizer
AU - Lee, Sangwoo
AU - Kavehrad, Mohsen
N1 - Funding Information:
Acknoelwegements A DARPA Grant sponsored by the U.S. Air Force Research Laboratory/Wright-Patterson AFB Contract-FA8650-04-C-7114 and The Pennsylvania State University CICTR have supported this research.
PY - 2009/12
Y1 - 2009/12
N2 - 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.
AB - 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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U2 - 10.1007/s10776-009-0109-x
DO - 10.1007/s10776-009-0109-x
M3 - Article
AN - SCOPUS:72449178315
SN - 1068-9605
VL - 16
SP - 185
EP - 196
JO - International Journal of Wireless Information Networks
JF - International Journal of Wireless Information Networks
IS - 4
ER -