Please use this identifier to cite or link to this item:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/10073
Title: | 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 |
Authors: | Wei-Ju Chiang 江威儒 |
Advisor: | 馮世邁(See-May Phoong) |
Keyword: | 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, |
Publication Year : | 2011 |
Degree: | 碩士 |
Abstract: | 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 |
Fulltext Rights: | 同意授權(全球公開) |
Appears in Collections: | 電信工程學研究所 |
Files in This Item:
File | Size | Format | |
---|---|---|---|
ntu-100-1.pdf | 1.02 MB | Adobe PDF | View/Open |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.