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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/10073
標題: | 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 Joint estimation of I/Q imbalance and carrier frequency offset for OFDM systems |
作者: | Wei-Ju Chiang 江威儒 |
指導教授: | 馮世邁(See-May Phoong) |
關鍵字: | 正交分頻多工系統,實虛部非協調,載波頻率位移, OFDM,I/Q imbalance,CFO, |
出版年 : | 2011 |
學位: | 碩士 |
摘要: | 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). |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/10073 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 電信工程學研究所 |
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ntu-100-1.pdf | 1.02 MB | Adobe PDF | 檢視/開啟 |
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