New method of polar channel coding for reducing the bit error rate with low complexity in the F-OFDM underwater acoustic communications
Underwater Acoustic (UWA) communication system plays a crucial role in various applications and contributes significant performance in comparison to other communication systems. UWA is essential in various applications such as oceanographic, oil exploration, military applications etc. However,...
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| 格式: | Thesis |
| 语言: | English English English |
| 出版: |
2020
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| 主题: | |
| 在线阅读: | http://eprints.uthm.edu.my/917/3/24p%20MUSTAFA%20SAMI%20AHMED.pdf http://eprints.uthm.edu.my/917/1/MUSTAFA%20SAMI%20AHMED%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/917/2/MUSTAFA%20SAMI%20AHMED%20WATERMARK.pdf |
| 总结: | Underwater Acoustic (UWA) communication system plays a crucial role in various
applications and contributes significant performance in comparison to other
communication systems. UWA is essential in various applications such as
oceanographic, oil exploration, military applications etc. However, it is
characterized by a high Bit Error Rate (BER), the main obstacle of the UWA system
in real applications because the sound waves are subjected to Underwater Acoustic
Noise (UWAN), which is either manmade or natural. Channel coding is one of the
effective BER reduction techniques that has been employed for reducing the BER.
Nonetheless, high computational complexity is the main drawback of this technique.
This thesis studies the UWAN in the shallow waters of tropical seas as a field data
which have a significant impulsive behaviour. The analysis of the field data showed
that the UWAN does not satisfy the assumption of Gaussian noise, it nonetheless fits
well to t-distribution with three degrees of freedom. Also, the derivation of Binary
Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK) for the
UWA was proposed and validated with the channel simulation. In addition, this
thesis proposes a new method in UWA for reducing the BER value with low
computational complexity. The proposed method has been applied to Orthogonal
Frequency Division Multiplexing (OFDM) and Filtered-OFDM (F-OFDM) systems
through MATLAB software simulation, where F-OFDM refers to the waveform
design candidate in the new technology. The efficiency of the proposed method is
verified by comparing the results with the existing channel coding in the literature
using MATLAB software simulation. The results obtained using the proposed
method and turbo code achieved a superior gain in the signal-noise ratio (SNR) about
11.2 dB and 13.5 dB respectively at BER of 1×10-3
compared to the uncoded
(without channel coding). In addition, the computational complexity levels have been
reduced about 84% and 68% for the information block length (k) of 256 and 1024
respectively. In conclusion, The F-OFDM shows a better as compared to OFDM. |
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