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研究生:胡煦佳
研究生(外文):Hsu-Chia Hu
論文名稱: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
論文名稱(外文):Joint Blind Estimation of I/Q Imbalance and Carrier Frequency Offset for Orthogonal Space-Time Block Coded OFDM Systems
指導教授:馮世邁
口試委員:蘇柏青王晉良吳文榕
口試日期:2014-07-15
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:電信工程學研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:英文
論文頁數:91
中文關鍵詞:正交分頻多工系統載波偏移實虛部非協調空時編碼
外文關鍵詞:OFDMCFOI/Q ImbalanceOSTBC
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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&;#8629;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.

List of Tables vii

List of Figures viii

Abstract xiii

Acknowledgements xv

1 Introduction........................................................... 1
2 I/Q Imbalance and Carrier Frequency Offset in OFDM Systems............. 5
2.1 Introduction to OFDMSystems.......................................... 6
2.2 Orthogonal STBC MIMO-OFDM Systems Model.............................. 10
2.3 The Phenomenon of I/Q Imbalance and CFO ............................. 11
2.4 I/Q Imbalance and CFO on the Received Baseband Signal Model.......... 12
2.5 Compensation of I/Q Imbalance and Carrier Frequency Offset........... 15
2.6 Simulation Result and Comparison .................................... 18
2.7 Concluding Remark.................................................... 21
3 Review of Blind I/Q Imbalance and CFO Estimation in OSTBC-OFDM Systems. 23
3.1 Review of OSTBC-OFDM Systems with 3 Transmit Antennas................ 24
3.2 Blind CFO Estimation Algorithms Based on Rank Criterion.............. 28
3.2.1 Proposed CFO Estimation Method Using Rank Criterion................ 28
3.2.2 SimulationResultandComparison ............... 30
3.3 Blind I/Q Imbalance Estimation Algorithms Based on Rank Criterion 33
3.3.1 Blind Estimation for Independent I/Q Imbalances . . . . . . . 33
3.3.2 Blind Estimation for Dependent I/Q Imbalances . . . . . . . 34
3.3.3 SimulationResultandComparison ............... 36
3.4 ConcludingRemark............................ 41
4 Joint Blind Estimation of I/Q Imbalance and CFO in OSTBC-OFDM Systems 43
4.1 Blind Independent I/Q Imbalance Estimation with CFO Based on
RankCriterionandGroupMethod ................... 44
4.2 Blind CFO Estimation with Independent I/Q Imbalance Compensation
BasedonRankCriterion......................... 51
4.3 SimulationResultandComparison ................... 52
4.4 ConcludingRemark............................ 60
5 Joint Blind Estimation of Frequency Dependent I/Q Imbalance and CFO in OSTBC-OFDM Systems 61
5.1 Blind Frequency Dependent I/Q Imbalance Estimation with CFO . . 62
5.1.1 ProposedSearchMethod..................... 64
5.1.2 ProposedIterativeMethod.................... 65
5.2 SimulationResultandComparison ................... 70
5.3 ConcludingRemark............................ 86
6 Conclusion 87
Bibliography 89


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