Underwater channel modelling, digital modem design and simulation

Due to the unique propagation characteristics of acoustic waves and the presence of noise from natural and man-made sources in underwater environments, modems used for such purposes often require custom tuning for specific locations and use-case scenarios. This thesis delves into the impact of incre...

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Main Author: Wang, Xuchen
Other Authors: Arokiaswami Alphones
Format: Thesis-Master by Coursework
Language:English
Published: Nanyang Technological University 2024
Subjects:
Online Access:https://hdl.handle.net/10356/173916
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1739162024-03-08T15:43:40Z Underwater channel modelling, digital modem design and simulation Wang, Xuchen Arokiaswami Alphones School of Electrical and Electronic Engineering Institute for Infocomm Research(I2R), A*Star Syed Naveen Altaf Ahmed EAlphones@ntu.edu.sg Computer and Information Science Underwater acoustic communication Channel characterization Channel estimation Orthogonal frequency division multiplexing Noise Due to the unique propagation characteristics of acoustic waves and the presence of noise from natural and man-made sources in underwater environments, modems used for such purposes often require custom tuning for specific locations and use-case scenarios. This thesis delves into the impact of increased reflections in underwater environments on Underwater Acoustic (UWA) channels. Our investigation, conducted within a metallic shipyard in Singapore, uncovers amplified sparsity and multipath attributes. We suggest that modems with lower transmission rates are more suitable in scenarios with diverse and prolonged delays. Bhattacharya Distance results indicate a Nakagami distribution for channels with increased reflections. In the domain of underwater modem design, the thesis focuses on channel estimation in underwater Orthogonal Frequency Division Multiplexing (OFDM) communication. Utilizing Bellhop to simulate ideal increased-reflection scenarios, we explore Least Squares (LS), Minimum Mean Square Error (MMSE), and Orthogonal Matching Pursuit (OMP) channel estimators . Noise reduction algorithms are evaluated, with the DFT-based scheme and SVD algorithm enhancing estimator performance. The thesis introduces an upgraded Pilot-Assisted OFDM modem system with DFT-SVD noise reduction, effectively mitigating channel estimation noise in low Signal-to-Noise Ratio scenarios, thus offering valuable insights for enhancing the robustness and performance of UWA communication systems. Master's degree 2024-03-06T08:05:10Z 2024-03-06T08:05:10Z 2023 Thesis-Master by Coursework Wang, X. (2023). Underwater channel modelling, digital modem design and simulation. Master's thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/173916 https://hdl.handle.net/10356/173916 en application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Computer and Information Science
Underwater acoustic communication
Channel characterization
Channel estimation
Orthogonal frequency division multiplexing
Noise
spellingShingle Computer and Information Science
Underwater acoustic communication
Channel characterization
Channel estimation
Orthogonal frequency division multiplexing
Noise
Wang, Xuchen
Underwater channel modelling, digital modem design and simulation
description Due to the unique propagation characteristics of acoustic waves and the presence of noise from natural and man-made sources in underwater environments, modems used for such purposes often require custom tuning for specific locations and use-case scenarios. This thesis delves into the impact of increased reflections in underwater environments on Underwater Acoustic (UWA) channels. Our investigation, conducted within a metallic shipyard in Singapore, uncovers amplified sparsity and multipath attributes. We suggest that modems with lower transmission rates are more suitable in scenarios with diverse and prolonged delays. Bhattacharya Distance results indicate a Nakagami distribution for channels with increased reflections. In the domain of underwater modem design, the thesis focuses on channel estimation in underwater Orthogonal Frequency Division Multiplexing (OFDM) communication. Utilizing Bellhop to simulate ideal increased-reflection scenarios, we explore Least Squares (LS), Minimum Mean Square Error (MMSE), and Orthogonal Matching Pursuit (OMP) channel estimators . Noise reduction algorithms are evaluated, with the DFT-based scheme and SVD algorithm enhancing estimator performance. The thesis introduces an upgraded Pilot-Assisted OFDM modem system with DFT-SVD noise reduction, effectively mitigating channel estimation noise in low Signal-to-Noise Ratio scenarios, thus offering valuable insights for enhancing the robustness and performance of UWA communication systems.
author2 Arokiaswami Alphones
author_facet Arokiaswami Alphones
Wang, Xuchen
format Thesis-Master by Coursework
author Wang, Xuchen
author_sort Wang, Xuchen
title Underwater channel modelling, digital modem design and simulation
title_short Underwater channel modelling, digital modem design and simulation
title_full Underwater channel modelling, digital modem design and simulation
title_fullStr Underwater channel modelling, digital modem design and simulation
title_full_unstemmed Underwater channel modelling, digital modem design and simulation
title_sort underwater channel modelling, digital modem design and simulation
publisher Nanyang Technological University
publishDate 2024
url https://hdl.handle.net/10356/173916
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