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

doi:10.1049/ote2.12058

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

Mathematics, Physics and Electrical Engineering

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

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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 language	English
Pages (from-to)	72-80
Number of pages	9
Journal	IET Optoelectronics
Volume	16
Issue number	2
Early online date	16 Sept 2021
DOIs	https://doi.org/10.1049/ote2.12058
Publication status	Published - 1 Apr 2022

Keywords

error correction codes
optical communication

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IET_Final_Clean_NMAccepted author manuscript, 784 KBLicence: CC BY
Advance online versionFinal published version, 1.27 MBLicence: CC BY
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title = "The BER Performance of a FSO System with Polar Codes Under Weak Turbulence",

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.",

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note = "Funding information: This work is supported by intensive industrial innovation program northeast, United Kingdom (IIIP NE) - 25R17P01847, partly funded by the European regional development fund (ERDF), European Union{\textquoteright}s COST Action on Newfocus CA19111, and MEYS of the Czech Republic project LTC18008.",

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AU - Li, Liying

AU - Mansour Abadi, Mojtaba

AU - Zvánovec, Stanislav

AU - Hudson, Ralph

AU - Htay, Zun

N1 - Funding information: This work is supported by intensive industrial innovation program northeast, United Kingdom (IIIP NE) - 25R17P01847, partly funded by the European regional development fund (ERDF), European Union’s COST Action on Newfocus CA19111, and MEYS of the Czech Republic project LTC18008.

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N2 - 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.

AB - 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.

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

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