Performance of Spatially Coupled LDPC Codes Over the Underwater Wireless Optical Channel With Strong Turbulence and Pointing Errors
The major problems in an underwater wireless optical communication (UWOC) link are turbulence induced fading and pointing errors. In this paper, we have investigated the bit error rate (BER) performance of spatially coupled low-density parity-check (SC-LDPC) coded horizontal UWOC link over a strong...
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2024-01-01
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| author | Sravan Kumar Padala John D'souza |
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| description | The major problems in an underwater wireless optical communication (UWOC) link are turbulence induced fading and pointing errors. In this paper, we have investigated the bit error rate (BER) performance of spatially coupled low-density parity-check (SC-LDPC) coded horizontal UWOC link over a strong turbulent channel model with pointing errors. The performance of this link for different channel and code parameters has been studied using simulations. It has been observed that a rate 1/2 ARJA protograph based SC-LDPC code with graph lifting factor of 256 gives a coding gain of 47 dB at a BER of <inline-formula> <tex-math notation="LaTeX">${10}^{-4}$ </tex-math></inline-formula> for strong turbulence channel model with pointing errors. An analytical BER expression for an uncoded UWOC link under strong turbulence with pointing errors for the On-Off Keying modulation technique has been derived. A multidimensional protograph based extrinsic information transfer algorithm has been developed to obtain the decoding thresholds for different channel parameters and code rates. We have also studied the SC-LDPC coded vertical UWOC link performance for some specific strong turbulence channel parameters with pointing errors and observed that as the link length increases from <inline-formula> <tex-math notation="LaTeX">$20 m$ </tex-math></inline-formula> to <inline-formula> <tex-math notation="LaTeX">$40 m$ </tex-math></inline-formula>, the performance gap between the hypothetical and cascaded channel models increases from <inline-formula> <tex-math notation="LaTeX">$1.1 dB$ </tex-math></inline-formula> to <inline-formula> <tex-math notation="LaTeX">$5.5 dB$ </tex-math></inline-formula>. |
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| spelling | doaj-art-d698c39568be40479596dcf55ba900282025-08-20T02:12:28ZengIEEEIEEE Access2169-35362024-01-0112582565827410.1109/ACCESS.2024.339247710506693Performance of Spatially Coupled LDPC Codes Over the Underwater Wireless Optical Channel With Strong Turbulence and Pointing ErrorsSravan Kumar Padala0https://orcid.org/0000-0002-6439-928XJohn D'souza1https://orcid.org/0009-0000-5154-8445Department of Electronics and Communication Engineering, National Institute of Technology Karnataka, Karnataka, Surathkal, IndiaDepartment of Electronics and Communication Engineering, National Institute of Technology Karnataka, Karnataka, Surathkal, IndiaThe major problems in an underwater wireless optical communication (UWOC) link are turbulence induced fading and pointing errors. In this paper, we have investigated the bit error rate (BER) performance of spatially coupled low-density parity-check (SC-LDPC) coded horizontal UWOC link over a strong turbulent channel model with pointing errors. The performance of this link for different channel and code parameters has been studied using simulations. It has been observed that a rate 1/2 ARJA protograph based SC-LDPC code with graph lifting factor of 256 gives a coding gain of 47 dB at a BER of <inline-formula> <tex-math notation="LaTeX">${10}^{-4}$ </tex-math></inline-formula> for strong turbulence channel model with pointing errors. An analytical BER expression for an uncoded UWOC link under strong turbulence with pointing errors for the On-Off Keying modulation technique has been derived. A multidimensional protograph based extrinsic information transfer algorithm has been developed to obtain the decoding thresholds for different channel parameters and code rates. We have also studied the SC-LDPC coded vertical UWOC link performance for some specific strong turbulence channel parameters with pointing errors and observed that as the link length increases from <inline-formula> <tex-math notation="LaTeX">$20 m$ </tex-math></inline-formula> to <inline-formula> <tex-math notation="LaTeX">$40 m$ </tex-math></inline-formula>, the performance gap between the hypothetical and cascaded channel models increases from <inline-formula> <tex-math notation="LaTeX">$1.1 dB$ </tex-math></inline-formula> to <inline-formula> <tex-math notation="LaTeX">$5.5 dB$ </tex-math></inline-formula>.https://ieeexplore.ieee.org/document/10506693/Bit error ratelow-density parity-check codespointing errorsprotographscintillation indexspatially coupled LDPC codes |
| spellingShingle | Sravan Kumar Padala John D'souza Performance of Spatially Coupled LDPC Codes Over the Underwater Wireless Optical Channel With Strong Turbulence and Pointing Errors IEEE Access Bit error rate low-density parity-check codes pointing errors protograph scintillation index spatially coupled LDPC codes |
| title | Performance of Spatially Coupled LDPC Codes Over the Underwater Wireless Optical Channel With Strong Turbulence and Pointing Errors |
| title_full | Performance of Spatially Coupled LDPC Codes Over the Underwater Wireless Optical Channel With Strong Turbulence and Pointing Errors |
| title_fullStr | Performance of Spatially Coupled LDPC Codes Over the Underwater Wireless Optical Channel With Strong Turbulence and Pointing Errors |
| title_full_unstemmed | Performance of Spatially Coupled LDPC Codes Over the Underwater Wireless Optical Channel With Strong Turbulence and Pointing Errors |
| title_short | Performance of Spatially Coupled LDPC Codes Over the Underwater Wireless Optical Channel With Strong Turbulence and Pointing Errors |
| title_sort | performance of spatially coupled ldpc codes over the underwater wireless optical channel with strong turbulence and pointing errors |
| topic | Bit error rate low-density parity-check codes pointing errors protograph scintillation index spatially coupled LDPC codes |
| url | https://ieeexplore.ieee.org/document/10506693/ |
| work_keys_str_mv | AT sravankumarpadala performanceofspatiallycoupledldpccodesovertheunderwaterwirelessopticalchannelwithstrongturbulenceandpointingerrors AT johndsouza performanceofspatiallycoupledldpccodesovertheunderwaterwirelessopticalchannelwithstrongturbulenceandpointingerrors |