Theoretical analysis and mitigation of inter-carrier interference in orthogonal frequency division multiplexing system
One of the main problems of high data rate transmission over wireless channel is the delay spread. Orthogonal Frequency Division Multiplexing (OFDM) system, which is robust against multipath propagation, is often employed for such hostile wireless environments. However, due to fast time varying (Dop...
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| Format: | Thesis |
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2008
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| Online Access: | https://hdl.handle.net/10356/4970 |
| _version_ | 1811686720418086912 |
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| author | Ng, Wee Teck |
| author2 | Vimal Kishore Dubey |
| author_facet | Vimal Kishore Dubey Ng, Wee Teck |
| author_sort | Ng, Wee Teck |
| collection | NTU |
| description | One of the main problems of high data rate transmission over wireless channel is the delay spread. Orthogonal Frequency Division Multiplexing (OFDM) system, which is robust against multipath propagation, is often employed for such hostile wireless environments. However, due to fast time varying (Doppler spread) channels, the performance of OFDM system degrades considerably. It is found that by using directional antenna or beamforming, the amount of Doppler spread can be reduced. To investigate the effect, Doppler Power Spectral Density (PSD) equations are derived where directional antennas are employed at the mobile or/and the base station. The Doppler PSDs are derived for two different Doppler spread channel models, the two dimensional (2-D) and three dimensional (3-D) models. The 2-D model considers only the azimuthal plane, whereas the 3-D model takes into account the effect of both azimuthal and elevation planes. The 2-D model is derived from the popular classical Clake/Jakes' model, whereas the 3-D model is extended from the uniform Doppler spread model. |
| first_indexed | 2024-10-01T05:04:54Z |
| format | Thesis |
| id | ntu-10356/4970 |
| institution | Nanyang Technological University |
| last_indexed | 2024-10-01T05:04:54Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | ntu-10356/49702023-07-04T16:48:14Z Theoretical analysis and mitigation of inter-carrier interference in orthogonal frequency division multiplexing system Ng, Wee Teck Vimal Kishore Dubey School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics One of the main problems of high data rate transmission over wireless channel is the delay spread. Orthogonal Frequency Division Multiplexing (OFDM) system, which is robust against multipath propagation, is often employed for such hostile wireless environments. However, due to fast time varying (Doppler spread) channels, the performance of OFDM system degrades considerably. It is found that by using directional antenna or beamforming, the amount of Doppler spread can be reduced. To investigate the effect, Doppler Power Spectral Density (PSD) equations are derived where directional antennas are employed at the mobile or/and the base station. The Doppler PSDs are derived for two different Doppler spread channel models, the two dimensional (2-D) and three dimensional (3-D) models. The 2-D model considers only the azimuthal plane, whereas the 3-D model takes into account the effect of both azimuthal and elevation planes. The 2-D model is derived from the popular classical Clake/Jakes' model, whereas the 3-D model is extended from the uniform Doppler spread model. DOCTOR OF PHILOSOPHY (EEE) 2008-09-17T10:02:26Z 2008-09-17T10:02:26Z 2006 2006 Thesis Ng, W. T. (2006). Theoretical analysis and mitigation of inter-carrier interference in orthogonal frequency division multiplexing system. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/4970 10.32657/10356/4970 Nanyang Technological University application/pdf |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics Ng, Wee Teck Theoretical analysis and mitigation of inter-carrier interference in orthogonal frequency division multiplexing system |
| title | Theoretical analysis and mitigation of inter-carrier interference in orthogonal frequency division multiplexing system |
| title_full | Theoretical analysis and mitigation of inter-carrier interference in orthogonal frequency division multiplexing system |
| title_fullStr | Theoretical analysis and mitigation of inter-carrier interference in orthogonal frequency division multiplexing system |
| title_full_unstemmed | Theoretical analysis and mitigation of inter-carrier interference in orthogonal frequency division multiplexing system |
| title_short | Theoretical analysis and mitigation of inter-carrier interference in orthogonal frequency division multiplexing system |
| title_sort | theoretical analysis and mitigation of inter carrier interference in orthogonal frequency division multiplexing system |
| topic | DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics |
| url | https://hdl.handle.net/10356/4970 |
| work_keys_str_mv | AT ngweeteck theoreticalanalysisandmitigationofintercarrierinterferenceinorthogonalfrequencydivisionmultiplexingsystem |