Joint estimation of I/Q imbalance and carrier frequency offset for OFDM systems
碩士 === 國立臺灣大學 === 電信工程學研究所 === 99 === Nowadays, direct-conversion radio frequency (RF) receivers become more appealing. However, orthogonal frequency division multiplexing (OFDM) systems with direct-conversion RF receivers are very sensitive to non-idealities at the front-end of receiver, such as I/...
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ndltd-TW-099NTU054350832015-10-16T04:03:09Z http://ndltd.ncl.edu.tw/handle/33914371766081058088 Joint estimation of I/Q imbalance and carrier frequency offset for OFDM systems 正交分頻多工系統鐘實虛部非協調與載波頻率位移之同估測 Wei-Ju Chiang 江威儒 碩士 國立臺灣大學 電信工程學研究所 99 Nowadays, direct-conversion radio frequency (RF) receivers become more appealing. However, orthogonal frequency division multiplexing (OFDM) systems with direct-conversion RF receivers are very sensitive to non-idealities at the front-end of receiver, such as I/Q imbalance and carrier frequency o set (CFO). These nonidealities at the receiver result in inter-carrier interference (ICI). Accurate estimates of the non-idealities and channel response are required in OFDM systems. In this thesis, the e ects of I/Q imbalance and CFO on OFDM systems are studied, and the estimation of these parameters is considered. To solve the problems, we propose a time domain method for joint estimation of I/Q imbalance and CFO as well as channel response. The proposed method requires only two OFDM training blocks as a preamble to accomplish joint estimation. Moreover, we do not put any restrictions on the preamble signal and thus the proposed method can be adopted in any communication systems with a preamble. It is shown by simulation results that our proposed method performs well for any channels as long as their order is not longer than cyclic prefix (CP). See-May Phoong 馮世邁 2011 學位論文 ; thesis 63 en_US |
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碩士 === 國立臺灣大學 === 電信工程學研究所 === 99 === Nowadays, direct-conversion radio frequency (RF) receivers become more appealing. However, orthogonal frequency division multiplexing (OFDM) systems with direct-conversion RF receivers are very sensitive to non-idealities at the front-end of receiver, such as I/Q imbalance and carrier frequency o set (CFO). These nonidealities at the receiver result in inter-carrier interference (ICI). Accurate estimates of the non-idealities and channel response are required in OFDM systems. In this thesis, the e ects of I/Q imbalance and CFO on OFDM systems are studied, and the estimation of these parameters is considered. To solve the problems, we propose a time domain method for joint estimation of I/Q imbalance and CFO as well as channel response. The proposed method requires only two OFDM training blocks as a preamble to accomplish joint estimation. Moreover, we do not put any restrictions on the preamble signal and thus the proposed method can be adopted in any communication systems with a preamble. It is shown by simulation results that our proposed method performs well for any channels as long as their order is not longer than cyclic prefix (CP).
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author2 |
See-May Phoong |
author_facet |
See-May Phoong Wei-Ju Chiang 江威儒 |
author |
Wei-Ju Chiang 江威儒 |
spellingShingle |
Wei-Ju Chiang 江威儒 Joint estimation of I/Q imbalance and carrier frequency offset for OFDM systems |
author_sort |
Wei-Ju Chiang |
title |
Joint estimation of I/Q imbalance and carrier frequency offset for OFDM systems |
title_short |
Joint estimation of I/Q imbalance and carrier frequency offset for OFDM systems |
title_full |
Joint estimation of I/Q imbalance and carrier frequency offset for OFDM systems |
title_fullStr |
Joint estimation of I/Q imbalance and carrier frequency offset for OFDM systems |
title_full_unstemmed |
Joint estimation of I/Q imbalance and carrier frequency offset for OFDM systems |
title_sort |
joint estimation of i/q imbalance and carrier frequency offset for ofdm systems |
publishDate |
2011 |
url |
http://ndltd.ncl.edu.tw/handle/33914371766081058088 |
work_keys_str_mv |
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