Underwater environment is still an attractive area to explore and exploit by human beings. However, underwater characteristics limit communications due to harsh channel conditions, and efficient channel codes are essential to deploy. This study presents an underwater system based on protograph low-density parity check (P-LDPC) codes and orthogonal frequency division multiplexing (OFDM) for image transmission. The system proves a successful reconstruction of P-LDPC coded images with different levels of comparison. The performance of the proposed system is evaluated using nine objective measures such as bit error rate (BER) and peak signal to noise ratio (PSNR). Firstly, the proposed system performance is evaluated with different block lengths of P-LDPC code. Then, the implemented system shows a coding gain of approximately 1.75 dB for applying P-LDPC when compared to polar with cyclic redundancy check at 0.0001 BER. Additionally, image subjective assessment is obtained to demonstrate how the P-LDPC outweighs polar and turbo product codes in terms of estimated image quality. Lastly, further investigation is performed to study the effect of varying fast Fourier transform (FFT) size and cyclic prefix (CP) length on image reserved quality. The results show that the received image is better reconstructed for larger FFT sizes since that produce longer CP and symbol duration, and that in turn helps the system to combat the multipath fading introduced by the underwater channel.

Aymen M. Al-Kadhimi

Ammar E. Abdelkareem

Charalampos C. Tsimenidis

Acta Polytechnica

Acta Polytechnica is a scientific journal published by CTU in Prague. The main title, Acta Polytechnica, is accompanied by the subtitle Journal of Advanced Engineering, which defines the scope of the journal more precisely - Acta Polytechnica covers a wide spectrum of engineering topics, physics and mathematics.    Our aim is to be a high-quality multi-disciplinary journal publishing the results of basic research and also applied research. We place emphasis on the quality of all published papers. The journal should also serve as a bridge between basic research in natural sciences and applied research in all technical disciplines.    The innovative research results published by young researchers or by postdoctoral fellows, and also the high-quality papers by researchers from the international scientific community, reflect the good position of CTU in the World University Rankings.    We hope that you will ﬁnd our journal interesting, and that it will serve as a valuable source of scientiﬁc information.

Acta Polytechnica is a scientific journal published by the Czech Technical University in Prague. The main title, Acta Polytechnica, is accompanied by the subtitle Journal of Advanced Engineering, which more precisely defines the scope of the journal. Acta Polytechnica covers a wide range of engineering topics, physics, and mathematics. Our aim is to be a high-quality multidisciplinary journal publishing the results of both basic and applied research. We place a strong emphasis on the quality of all published papers. The journal also serves as a bridge between basic research in the natural sciences and applied research across all technical disciplines. The innovative research results published by young researchers or postdoctoral fellows, along with high-quality papers from the international scientific community, reflect the strong position of the Czech Technical University in the World University Rankings. We hope you find our journal interesting and that it serves as a valuable source of scientific information.

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P-LDPC coded image transmission with OFDM over underwater acoustic channel

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Journal Info

Category	Quartile
ENGINEERING, MULTIDISCIPLINARY	3