UWOC performance based on dual polarization and raised cosine filter
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Jabbar K. Mohammed
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Riyadh Mansoor
Abstract
In underwater optical communications (UWOC) systems, when an optical signal encounters scattering objects or reflects off other underwater bodies before reaching the detector, it ultimately results in the scattering of waveform time and time spreading, which decreases the data rate due to inter-symbol interference (ISI). This paper proposes using a simple transmitter for pulse amplitude modulation (PAM) combined with dual-polarization (DP), and a raised cosine filter (RCF) is utilized at the receiver. The main goal of this system is to double the data rate capacity for features of DP, improve the bit error rate (BER), and ensure an optimized coverage range for the capabilities of mitigating symbol interferences. Different attenuation cases for the proposed system are examined based on water turbidity. In addition, the proposed system is evaluated in different worse cases, such as in turbulences, channel delay, and the different inclination angle and roll-off factors. However, it can reach an acceptable coverage distance of 7 m for turbid water while it increases to 72 m for pure water at BER = 10−6.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: The author conceived and designed the study, collected and analyzed the data, and wrote the paper.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Conflict of interest: The authors declare no conflict of interest.
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Research funding: None declared.
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Data availability: The corresponding author will provide the datasets and curves produced during the current investigation upon reasonable request.
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