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BER performance analysis of a non-Hermitian coherent optical OFDM FSO system with polarization diversity using various atmospheric turbulent channel models

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Abstract

In this research article, we investigate the impact of different atmospheric turbulence along with polarization crosstalk on the bit error rate (BER) performance of a non-Hermitian orthogonal frequency division modulated (OFDM) free-space optical (FSO) system with polarization diversity. Analysis is carried out for a non-Hermitian coherent optical OFDM followed by differential quadrature phase shift keying FSO system with polarization diversity in presence of atmospheric turbulence for all weather conditions. We considered Log-normal, Gamma-Gamma and Negative exponential turbulence fading model for weak, medium and strong atmospheric turbulent channel respectively and for cross polarization induced crosstalk, the random misalignment angle is Maxwellian distributed. The system average BER is calculated by averaging the conditional BER over the probability density function of the channel irradiance along with Maxwellian distributed random misalignment angle. Results are evaluated in terms of BER, power penalty due to polarization crosstalk along with atmospheric turbulence and receiver sensitivity due to OFDM. Results show that the system suffers almost 7.5, 11 and 16 dB power penalty due to polarization crosstalk along with weak, medium and strong turbulence respectively at a constant BER of 10–12 when the system link length is 3000 m. It is clearly observed that, almost 19, 16 and 10 dB receiver sensitivity is achieved when number of subcarriers increase into 512 for weak, medium and strong turbulence conditions, respectively at a constant BER of 10–12.

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Acknowledgement

We acknowledge with appreciations to the BUET (Department of EEE) for giving us the opportunity to use lab facilities to complete our research successfully.

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We have no any funding source from our institution for this research work, so all organizations are requested to fund our research work.

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Authors and Affiliations

  1. Department of EEE, Bangladesh University of Engineering and Technology (BUET), Dhaka, Bangladesh

    M. Shariful Islam & S. P. Majumder

  2. Department of EEE, Ahsanullah University of Science and Technology (AUST), Dhaka, Bangladesh

    M. Shariful Islam

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  1. M. Shariful Islam
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  2. S. P. Majumder
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Correspondence to M. Shariful Islam.

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Islam, M.S., Majumder, S.P. BER performance analysis of a non-Hermitian coherent optical OFDM FSO system with polarization diversity using various atmospheric turbulent channel models. Opt Quant Electron 54, 302 (2022). https://doi.org/10.1007/s11082-022-03698-5

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