Mitigation techniques for wireless communications over fading channels
In a wireless communication system, there are usually many obstacles between the transmitter and the receiver, so a superposition of numerous reflected components will be the signal the receiver received. This multipath propagation causes inevitable changes in the amplitude, phase and angle of the...
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| Format: | Thesis-Master by Coursework |
| Language: | English |
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Nanyang Technological University
2023
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| Online Access: | https://hdl.handle.net/10356/169150 |
| _version_ | 1826115781203591168 |
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| author | Shen, Yaru |
| author2 | Li Kwok Hung |
| author_facet | Li Kwok Hung Shen, Yaru |
| author_sort | Shen, Yaru |
| collection | NTU |
| description | In a wireless communication system, there are usually many obstacles between the
transmitter and the receiver, so a superposition of numerous reflected components
will be the signal the receiver received. This multipath propagation causes inevitable changes in the amplitude, phase and angle of the signal reaching the receiver, resulting in multipath fading. Two main typical types of fading are Rayleigh fading and Rician fading. To mitigate the fading, we adopt orthogonal frequency division multiplexing (OFDM) technology. OFDM can divide a big data stream with a high transmission rate into N parallel data streams, and each is modulated. Accordingly, the final signal can resist distortion and fading to a certain extent. In this dissertation, we introduce the additive white Gaussian noise (AWGN) channel model, Rayleigh channel model and Rician channel model. Then we calculate the ideal bit-error rate (BER) of Quadrature-phase-shift keying (QPSK) signals in these channels. In order to mitigate fading, we design a parameter-based OFDM system, and add channel estimation, spread spectrum and other modules to the OFDM system for optimization. The result is analyzed by the final BER curve. All the process is simulated in MATLAB. |
| first_indexed | 2024-10-01T04:00:46Z |
| format | Thesis-Master by Coursework |
| id | ntu-10356/169150 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:00:46Z |
| publishDate | 2023 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1691502023-07-04T15:15:25Z Mitigation techniques for wireless communications over fading channels Shen, Yaru Li Kwok Hung School of Electrical and Electronic Engineering EKHLI@ntu.edu.sg Engineering::Electrical and electronic engineering::Wireless communication systems In a wireless communication system, there are usually many obstacles between the transmitter and the receiver, so a superposition of numerous reflected components will be the signal the receiver received. This multipath propagation causes inevitable changes in the amplitude, phase and angle of the signal reaching the receiver, resulting in multipath fading. Two main typical types of fading are Rayleigh fading and Rician fading. To mitigate the fading, we adopt orthogonal frequency division multiplexing (OFDM) technology. OFDM can divide a big data stream with a high transmission rate into N parallel data streams, and each is modulated. Accordingly, the final signal can resist distortion and fading to a certain extent. In this dissertation, we introduce the additive white Gaussian noise (AWGN) channel model, Rayleigh channel model and Rician channel model. Then we calculate the ideal bit-error rate (BER) of Quadrature-phase-shift keying (QPSK) signals in these channels. In order to mitigate fading, we design a parameter-based OFDM system, and add channel estimation, spread spectrum and other modules to the OFDM system for optimization. The result is analyzed by the final BER curve. All the process is simulated in MATLAB. Master of Science (Communications Engineering) 2023-07-04T06:00:26Z 2023-07-04T06:00:26Z 2023 Thesis-Master by Coursework Shen, Y. (2023). Mitigation techniques for wireless communications over fading channels. Master's thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/169150 https://hdl.handle.net/10356/169150 en application/pdf Nanyang Technological University |
| spellingShingle | Engineering::Electrical and electronic engineering::Wireless communication systems Shen, Yaru Mitigation techniques for wireless communications over fading channels |
| title | Mitigation techniques for wireless communications over fading channels |
| title_full | Mitigation techniques for wireless communications over fading channels |
| title_fullStr | Mitigation techniques for wireless communications over fading channels |
| title_full_unstemmed | Mitigation techniques for wireless communications over fading channels |
| title_short | Mitigation techniques for wireless communications over fading channels |
| title_sort | mitigation techniques for wireless communications over fading channels |
| topic | Engineering::Electrical and electronic engineering::Wireless communication systems |
| url | https://hdl.handle.net/10356/169150 |
| work_keys_str_mv | AT shenyaru mitigationtechniquesforwirelesscommunicationsoverfadingchannels |