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Optical and Quantum Electronics

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01-12-2023

Coherent-Circular Polarized Shift Keying Modulation Analysis over Malaga Distribution and Ғ Distribution with Pointing Errors in Free Space Optical Communication

Authors: Bipin K. Saw, Vijay Janyani, Ghanshyam Singh

Published in: Optical and Quantum Electronics | Issue 13/2023

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Abstract

In this paper, a proposed circular polarized shift keying (CPolSK) is analyzed for free space optical (FSO) communication system under Ғ distribution channel model and Malaga (\(\mathcal{M}\)) distribution channel model. The proposed CPolSK FSO system contains two feedback paths at the receiver section, in which one for correcting the polarization error in the polarization controller and the other for correcting the slow frequency fluctuations in the local oscillator (LO). Also, two 90⁰ optical hybrids are used for mixing the incoming polarized signal and the polarized LO signal. Average BER (ABER) expressions and outage probability expressions are derived for the CPolSK FSO communication system under Ғ distribution channel model and \(\mathcal{M}\) distribution channel model. The results for different atmospheric turbulence (AT) conditions, phase noise variance and polarization control error are analyzed. Also, the system outage probability for different phase noise variance \(0.085\pi\), \(0.25\pi\) and \(0.625\pi\) for different SNR thresholds for low AT condition are analyzed. In the results, it can be observed that the ABER performance improves as AT conditions improve, as the phase noise variance decreases and as the polarization control decreases. Also, when AT conditions get worse, then to get same outage probability, we have to increase the SNR threshold. Varying the phase noise variance for \({\delta }^{2}=0.085\pi\) to \({\delta }^{2}=0.625\pi\) at low AT condition resulted in a power penalty of more than 4 dB for the same outage probability at 0.3. Additionally, it is observed that the \(\mathcal{M}\) distribution channel model has a steeper slope in the outage probability against normalised threshold graph than the Ғ distribution channel model.

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Title: Coherent-Circular Polarized Shift Keying Modulation Analysis over Malaga Distribution and Ғ Distribution with Pointing Errors in Free Space Optical Communication
Authors: Bipin K. Saw
Vijay Janyani
Ghanshyam Singh
Publication date: 01-12-2023
Publisher: Springer US
Published in: Optical and Quantum Electronics / Issue 13/2023
Print ISSN: 0306-8919
Electronic ISSN: 1572-817X
DOI: https://doi.org/10.1007/s11082-023-05297-4

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