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標題: | 正交空時編碼之正交分頻多工系統中實虛部非協調與載波偏移之同盲估測 Joint Blind Estimation of I/Q Imbalance and Carrier Frequency Offset for Orthogonal Space-Time Block Coded OFDM Systems |
作者: | Hsu-Chia Hu 胡煦佳 |
指導教授: | 馮世邁 |
關鍵字: | 正交分頻多工系統,載波偏移,實虛部非協調,空時編碼, OFDM,CFO,I/Q Imbalance,OSTBC, |
出版年 : | 2014 |
學位: | 碩士 |
摘要: | Orthogonal frequency division multiplexing (OFDM) has recently received considerable interest for its advantages in high-bit-rate transmissions over frequency-selective fading channels. Space-time block coding (STBC) has emerged as a powerful approach to exploit spatial diversity and to combat fading in multiple-input multiple-output (MIMO) wireless communication systems. However, 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 non-idealities at the receiver result in intercarrier interference (ICI). Accurate estimates of the non-idealities and channel response are required in OFDM systems. This thesis studies the blind CFO and I/Q imbalance estimation for OFDM systems with multiple transmit antennas. The thesis consists of three parts. In the first part, we review an existing CFO and I/Q imbalance estimation method based on rank criterion. This method though gives good performance but not for joint estimation, it cannot estimate the I/Q imbalance in the presense of CFO. In order to solve this issue, we propose an improved method. In the second part, we propose a new rank criteron and group method for joint CFO and independent I/Q imbalance estimation. The proposed method exploits the redundant information in OSTBC for joint blind CFO and I/Q imbalance estimation. In the third part, we extend the proposed method to the estimation of frequency dependent I/Q imbalance in the presence of CFO. We also provide numerical simulation to verify the performance of the proposed methods. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/57066 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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