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

Mohan, Nithin, Ghassemlooy, Zabih, Li, Emma, Mansour Abadi, Mojtaba, Zvánovec, Stanislav, Hudson, Ralph and Htay, Zun (2022) The BER Performance of a FSO System with Polar Codes Under Weak Turbulence. IET Optoelectronics, 16 (2). pp. 72-80. ISSN 1751-8768

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Abstract

The key challenge in free space optical (FSO) communications is combating the 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 paper we investigate the FSO system with polar codes and analyse its performance by determining the optimum code-rate required to achieve a bit error rate of 10-9 under weak turbulence. We show that, using Monte-Carlo simulations for the scintillation indices of 0.12 and 0.2, the successive cancellation list (SCL) decoder offers coding gains of 2.5 and 0.3 dB, respectively as compared with SC decoder, and for scintillation index of 0.31, the SC decoder offers a coding gain of 2.5 dB compared to SCL decoder for the code rate.

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