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An Efficient Method for Offset Mitigation in Free-Space Optical Systemsopen access

Authors
Saraereh, Omar A.Khan, ImranLee, Jeong Woo
Issue Date
Aug-2019
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords
FSO; system performance; BER; turbulence; channel estimation
Citation
IEEE PHOTONICS JOURNAL, v.11, no.4
Journal Title
IEEE PHOTONICS JOURNAL
Volume
11
Number
4
URI
https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/36409
DOI
10.1109/JPHOT.2019.2926126
ISSN
1943-0655
1943-0647
Abstract
Channel estimation is a key feature for free space optical (FSO) wireless communication systems which are required for a high QoS and high data rate system. Aiming at the problem of FSO wireless channel estimation, this paper proposes an implicit sequence channel estimation scheme to eliminate do offset, and studies the key factors affecting the system performance. The optimal power allocation factor is derived based on the maximum SNR criterion. The system performance parameters such as the bit error rate (BER), mean square error (MSE), and computational complexity are evaluated. The results show that under the same do bias condition, the MSE is estimated to decrease significantly after using the method of this paper. With the increase of dc offset d, the system error rate is significantly reduced and more approaching d = 0 (i.e., no dc offset). The proposed algorithm effectively mitigates the do offset impact on the system and the BER is significantly improved while the MSE is reduced to 50% of the traditional state-of-the-art method. The proposed work can provide a technical solution to the FSO system and give support to technological development.
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창의ICT공과대학 (전자전기공학부)
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