The BER Performance of a FSO System with Polar Codes Under Weak Turbulence

Nithin Mohan*, Zabih Ghassemlooy, Liying Li, Mojtaba Mansour Abadi, Stanislav Zvánovec, Ralph Hudson, Zun Htay

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

The key challenge in free space optical (FSO) communications is combating turbulence-induced fading. As the channel fading in FSO is quasi-static, the transmission parameters such as the code rates, transmit power and modulation schemes can be modified with respect to the channel state information transmitted via the feedback path. As a result, adaptive channel coding is considered as one of the practical approaches to improve the FSO link performance. In this study, the FSO system with polar codes is investigated and its performance is analysed by determining the optimum code-rate required to achieve a bit error rate of 10−9 under weak turbulence. It is shown that, using Monte-Carlo simulations for the scintillation indices of 0.12 and 0.2, the successive cancelation list (SCL) decoder offers coding gains of 2.5 and 0.3 dB, respectively, as compared with SC decoder, and for the scintillation index of 0.31, the SC decoder offers a coding gain of 2.5 dB compared to that of the SCL decoder for the code rate.
Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalIET Optoelectronics
Early online date16 Sep 2021
DOIs
Publication statusE-pub ahead of print - 16 Sep 2021

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