DFT-Based Channel Estimation with Symmetric Extension for OFDMA Systems
A novel partial frequency response channel estimator is proposed for OFDMA systems. First, the partial frequency response is obtained by least square (LS) method. The conventional discrete Fourier transform (DFT) method will eliminate the noise in time domain. However, after inverse discrete Fourier...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2009-01-01
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| Series: | EURASIP Journal on Wireless Communications and Networking |
| Online Access: | http://dx.doi.org/10.1155/2009/647130 |
| _version_ | 1818059226057015296 |
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| author | Yi Wang Lihua Li Ping Zhang Zemin Liu |
| author_facet | Yi Wang Lihua Li Ping Zhang Zemin Liu |
| author_sort | Yi Wang |
| collection | DOAJ |
| description | A novel partial frequency response channel estimator is proposed for OFDMA systems. First, the partial frequency response is obtained by least square (LS) method. The conventional discrete Fourier transform (DFT) method will eliminate the noise in time domain. However, after inverse discrete Fourier transform (IDFT) of partial frequency response, the channel impulse response will leak to all taps. As the leakage power and noise are mixed up, the conventional method will not only eliminate the noise, but also lose the useful leaked channel impulse response and result in mean square error (MSE) floor. In order to reduce MSE of the conventional DFT estimator, we have proposed the novel symmetric extension method to reduce the leakage power. The estimates of partial frequency response are extended symmetrically. After IDFT of the symmetric extended signal, the leakage power of channel impulse response is self-cancelled efficiently. Then, the noise power can be eliminated with very small leakage power loss. The computational complexity is very small, and the simulation results show that the accuracy of our estimator has increased significantly compared with the conventional DFT-based channel estimator. |
| first_indexed | 2024-12-10T13:13:09Z |
| format | Article |
| id | doaj.art-6652da126f5a42e1b375f390c5504aaf |
| institution | Directory Open Access Journal |
| issn | 1687-1472 1687-1499 |
| language | English |
| last_indexed | 2024-12-10T13:13:09Z |
| publishDate | 2009-01-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | EURASIP Journal on Wireless Communications and Networking |
| spelling | doaj.art-6652da126f5a42e1b375f390c5504aaf2022-12-22T01:47:37ZengSpringerOpenEURASIP Journal on Wireless Communications and Networking1687-14721687-14992009-01-01200910.1155/2009/647130DFT-Based Channel Estimation with Symmetric Extension for OFDMA SystemsYi WangLihua LiPing ZhangZemin LiuA novel partial frequency response channel estimator is proposed for OFDMA systems. First, the partial frequency response is obtained by least square (LS) method. The conventional discrete Fourier transform (DFT) method will eliminate the noise in time domain. However, after inverse discrete Fourier transform (IDFT) of partial frequency response, the channel impulse response will leak to all taps. As the leakage power and noise are mixed up, the conventional method will not only eliminate the noise, but also lose the useful leaked channel impulse response and result in mean square error (MSE) floor. In order to reduce MSE of the conventional DFT estimator, we have proposed the novel symmetric extension method to reduce the leakage power. The estimates of partial frequency response are extended symmetrically. After IDFT of the symmetric extended signal, the leakage power of channel impulse response is self-cancelled efficiently. Then, the noise power can be eliminated with very small leakage power loss. The computational complexity is very small, and the simulation results show that the accuracy of our estimator has increased significantly compared with the conventional DFT-based channel estimator.http://dx.doi.org/10.1155/2009/647130 |
| spellingShingle | Yi Wang Lihua Li Ping Zhang Zemin Liu DFT-Based Channel Estimation with Symmetric Extension for OFDMA Systems EURASIP Journal on Wireless Communications and Networking |
| title | DFT-Based Channel Estimation with Symmetric Extension for OFDMA Systems |
| title_full | DFT-Based Channel Estimation with Symmetric Extension for OFDMA Systems |
| title_fullStr | DFT-Based Channel Estimation with Symmetric Extension for OFDMA Systems |
| title_full_unstemmed | DFT-Based Channel Estimation with Symmetric Extension for OFDMA Systems |
| title_short | DFT-Based Channel Estimation with Symmetric Extension for OFDMA Systems |
| title_sort | dft based channel estimation with symmetric extension for ofdma systems |
| url | http://dx.doi.org/10.1155/2009/647130 |
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