LDPC code and PPM modulation in free space optical communication system

Free space optical (FSO) communication is a wireless technology, has many advantages that traditional microwave communication doesn’t have, such as no interference at the same frequency, wide bandwidth and convenient to use. Since it’s crucial problem has been solved, it’s now back to people’s sight...

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Main Author: Yang, Chuntao
Other Authors: Wang Qijie
Format: Thesis-Master by Coursework
Language:English
Published: Nanyang Technological University 2020
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Online Access:https://hdl.handle.net/10356/143577
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1435772023-07-04T16:57:47Z LDPC code and PPM modulation in free space optical communication system Yang, Chuntao Wang Qijie School of Electrical and Electronic Engineering qjwang@ntu.edu.sg Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics Free space optical (FSO) communication is a wireless technology, has many advantages that traditional microwave communication doesn’t have, such as no interference at the same frequency, wide bandwidth and convenient to use. Since it’s crucial problem has been solved, it’s now back to people’s sight to meet some special communication needs. Refer to a good amount of papers, this dissertation studied modeling of atmospheric channels; modulation and encoding methods that fit FSO systems; and simulated the transmission process. In modeling of atmospheric channels part, effects caused by atmosphere are investigated, which includes absorption, scattering and turbulence. Among them, turbulence is the most complicated, and also the most concerned. Based on learning atmospheric channels, several modulation methods are studied and compared. Pulse position modulation (PPM) has been used to do further study. Principles of LDPC code are investigated. PPM and LDPC code are used as modulation and encoding techniques to simulate the FSO system transmission. Performances of LDPC code are studied when transmitting data and images. Image processing method is proposed to improve image quality. Master of Science (Communications Engineering) 2020-09-10T04:52:17Z 2020-09-10T04:52:17Z 2020 Thesis-Master by Coursework https://hdl.handle.net/10356/143577 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 Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
spellingShingle Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
Yang, Chuntao
LDPC code and PPM modulation in free space optical communication system
description Free space optical (FSO) communication is a wireless technology, has many advantages that traditional microwave communication doesn’t have, such as no interference at the same frequency, wide bandwidth and convenient to use. Since it’s crucial problem has been solved, it’s now back to people’s sight to meet some special communication needs. Refer to a good amount of papers, this dissertation studied modeling of atmospheric channels; modulation and encoding methods that fit FSO systems; and simulated the transmission process. In modeling of atmospheric channels part, effects caused by atmosphere are investigated, which includes absorption, scattering and turbulence. Among them, turbulence is the most complicated, and also the most concerned. Based on learning atmospheric channels, several modulation methods are studied and compared. Pulse position modulation (PPM) has been used to do further study. Principles of LDPC code are investigated. PPM and LDPC code are used as modulation and encoding techniques to simulate the FSO system transmission. Performances of LDPC code are studied when transmitting data and images. Image processing method is proposed to improve image quality.
author2 Wang Qijie
author_facet Wang Qijie
Yang, Chuntao
format Thesis-Master by Coursework
author Yang, Chuntao
author_sort Yang, Chuntao
title LDPC code and PPM modulation in free space optical communication system
title_short LDPC code and PPM modulation in free space optical communication system
title_full LDPC code and PPM modulation in free space optical communication system
title_fullStr LDPC code and PPM modulation in free space optical communication system
title_full_unstemmed LDPC code and PPM modulation in free space optical communication system
title_sort ldpc code and ppm modulation in free space optical communication system
publisher Nanyang Technological University
publishDate 2020
url https://hdl.handle.net/10356/143577
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