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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 馮世邁(See-May Phoong) | |
dc.contributor.author | Yen-Chang Pan | en |
dc.contributor.author | 潘彥璋 | zh_TW |
dc.date.accessioned | 2021-06-16T17:33:50Z | - |
dc.date.available | 2014-08-22 | |
dc.date.copyright | 2012-08-22 | |
dc.date.issued | 2012 | |
dc.date.submitted | 2012-08-15 | |
dc.identifier.citation | [1] H. Anton and C. Rorres, Elementary Linear Algebra with Supplemental Applications, Wiley, 10th ed., 2011
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/64184 | - |
dc.description.abstract | Carrier frequency offset (CFO) and in-phase and quadrature-phase (I/Q) imbalance are two of the common front-end imperfections in low-cost communication devices. It is known that CFO is a crucial problem in orthogonal frequency division multiplexing-based (OFDM-based) systems. It can destroy the orthogonality between subcarriers and cause significant degradation in system performance. Also, the existence of the I/Q imbalance usually reduces the accuracy of CFO estimation. In the first part of the thesis, we study data-aided scheme for joint CFO and I/Q imbalance estimation and also subspace-based blind CFO estimation.
Firstly, we propose a new data-aided scheme for the joint estimation of CFO and I/Q imbalance using simple matrix formulation. The proposed algorithms utilize only the periodicity of the training sequence. They do not need to know the channel impulse response and the exact values of the training sequence. Analytic performance evaluation of the proposed algorithm is also carried out. The proposed method compares favorably with the existing methods in terms of both bit-error-rate (BER) performance and complexity. Secondly, we propose a novel subspace-based blind CFO estimation method for cyclic-prefixed OFDM (CP-OFDM) systems. Our method is based on the concept of blind subspace channel estimation algorithm using only a few received CP-OFDM blocks in one of the earlier works. The CFO is obtained by solving the nullspace of the proposed rank-reduced matrix and the CFO estimate is given in analytic form. We also prove that the proposed method can work properly in CP-OFDM systems with and without virtual carriers (VC), which is independent of how VC positions are assigned. Moreover, we do not make the assumption that the modulation symbols are white or constant-modulus. Simulation results show that the proposed method not only has a good performance, it is more robust to various signal constellations and VC assignments than the existing methods. In the last decade, several subspace-based algorithms for blind channel identification were introduced. These subspace-based methods are attractive because highly accurate estimate of the channel can be obtained by using only a few received blocks. However, these subspace-based methods do not work when applying to the zero-padded orthogonal frequency division multiplexing systems (ZP-OFDM) with VC. In the second part of the thesis, we propose two improvements on an earlier subspace-based blind channel estimation method. Firstly, we introduce a simple noise weighting matrix. This weighting matrix is diagonal and it is independent of the channel noise variance and SNR. By doing so, the performance of previous work is significantly enhanced. Secondly, we extend the blind estimation method to ZP-OFDM systems with virtual carriers. The proposed method not only works for ZP-OFDM system with VC, but also exploits the VC information to further enhance the estimation accuracy. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T17:33:50Z (GMT). No. of bitstreams: 1 ntu-101-D97942022-1.pdf: 1988360 bytes, checksum: 794320d6799bf05777ac998a9febbdd2 (MD5) Previous issue date: 2012 | en |
dc.description.tableofcontents | Abstract xv
Acknowledgements xix 1 Introduction 1 2 CFO and I/Q Imbalance in Direct-Conversion Receivers 9 2.1 Signal and System Model . . . . . . . . . . . . . . . . . . . . . . . . . 10 2.1.1 Training Sequence Transmission . . . . . . . . . . . . . . . . . 10 2.1.2 Cyclic-Prexed OFDM (CP-OFDM) . . . . . . . . . . . . . . 11 2.1.3 Zero-Padded OFDM (ZP-OFDM) . . . . . . . . . . . . . . . . 16 2.2 CFO and I/Q Imbalance . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.2.1 CFO on the Received Baseband Signal . . . . . . . . . . . . . 19 2.2.2 CFO and Frequency-Independent I/Q Imbalance (FI-IQ) . . . 20 2.2.3 CFO and Frequency-Dependent I/Q Imbalance (FD-IQ) . . . 21 2.3 Eect of CFO and I/Q Imbalance on OFDM-Based systems . . . . . 24 2.4 Concluding remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3 Data-Aided CFO and I/Q Imbalance Estimation 29 3.1 Joint Estimation of CFO and FI-IQ . . . . . . . . . . . . . . . . . . . 30 3.1.1 CFO Estimators . . . . . . . . . . . . . . . . . . . . . . . . . 31 3.1.2 I/Q Imbalance Estimation and Rened CFO Estimation . . . 38 3.1.3 Complexity Issue . . . . . . . . . . . . . . . . . . . . . . . . . 40 3.1.4 Simulation Results and Comparisons . . . . . . . . . . . . . . 42 3.1.5 Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . 51 3.2 Joint Estimation of CFO and FD-IQ . . . . . . . . . . . . . . . . . . 53 3.2.1 CFO Estimators . . . . . . . . . . . . . . . . . . . . . . . . . 55 3.2.2 Compensation of I/Q Imbalance . . . . . . . . . . . . . . . . . 59 3.2.3 Complexity Issue . . . . . . . . . . . . . . . . . . . . . . . . . 61 3.2.4 Simulation Results and Comparisons . . . . . . . . . . . . . . 62 3.2.5 Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . 69 4 Blind CFO Estimation in CP-OFDM Systems 71 4.1 Proposed matrix formulation . . . . . . . . . . . . . . . . . . . . . . . 74 4.2 CFO estimator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 4.2.1 The limitations on Q and J . . . . . . . . . . . . . . . . . . . 80 4.2.2 Complexity issue . . . . . . . . . . . . . . . . . . . . . . . . . 81 4.3 Simulation results and discussions . . . . . . . . . . . . . . . . . . . . 82 4.4 Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 89 5 Blind Channel Identication in ZP-OFDM Systems 91 5.1 Review of earlier works [49, 46, 39] . . . . . . . . . . . . . . . . . . . 92 5.2 Proposed noise weighting matrix . . . . . . . . . . . . . . . . . . . . . 94 5.3 Extension of the method to ZP-OFDM systems with virtual carriers . 96 5.4 Simulation Results . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 5.5 Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 106 6 Conclusions 109 Publication List 112 A Proofs of Chapter 3 115 A.1 Eigenanalysis of ZZy . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 A.2 Performance analysis of cosine estimator . . . . . . . . . . . . . . . . 118 A.3 Derivation of (3.22) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123 A.4 Derivation of (3.46) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124 B Proofs of Chapter 4 127 B.1 Proof of Theorem 4.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 B.2 Proof of Theorem 4.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 C Proof of Theorem 5.2 137 Bibliography 142 | |
dc.language.iso | en | |
dc.title | 基於正交分頻多工的直接轉換接收器中載波頻率飄移與實虛部非協調與通道響應之估測 | zh_TW |
dc.title | Estimation of Carrier Frequency Offset, I/Q Imbalance, and Channel Response in OFDM-Based Direct-Conversion Receivers | en |
dc.type | Thesis | |
dc.date.schoolyear | 100-2 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 陳紹基,祁忠勇,蘇柏青,蘇炫榮,蘇育德 | |
dc.subject.keyword | 載波頻率飄移,實虛部非協調,通道響應,正交分頻多工,直接轉換接收器, | zh_TW |
dc.subject.keyword | carrier frequency offset,I/Q imbalance,channel response,OFDM,direct-conversion receiver, | en |
dc.relation.page | 151 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2012-08-15 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
顯示於系所單位: | 電信工程學研究所 |
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