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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 馮世邁(See-May Phoong) | |
| dc.contributor.author | Chao-Wei Chang | en |
| dc.contributor.author | 張朝韋 | zh_TW |
| dc.date.accessioned | 2021-06-15T04:45:10Z | - |
| dc.date.available | 2012-08-16 | |
| dc.date.copyright | 2010-08-16 | |
| dc.date.issued | 2010 | |
| dc.date.submitted | 2010-08-06 | |
| dc.identifier.citation | [1] Asymmetrical Digital Subscriber Line (ADSL) Transceivers, International Telecommunications Union, ITU Recommendation G.992.1, 1999.
[2] Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: High-Speed Physical Layer in the 5 GHz Band, IEEE Standard 802.11a-1999-Part 11, 1999. [3] European Telecommunication Standards Institute, 'Digital Audio Broadcasting (DAB) to mobile, portable and fixed receivers,' EST 300 401, 1994. [4] European Telecommunication Standards Institute, 'Digital video broadcasting; framing, structure, channel coding and modulation for digital terrestrial television (DVB-T),' EST 300 744, 1997. [5] 3GPP TS 36.300, 3rd Generation Partnership Project Technical Specification Group Radio Access Network, 'Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall Description; Stage 2 (Release 8).' [6] B. Razavi, 'Design considerations for direct-conversion receiver,' IEEE TCAS-II: Analog and Digital Signal Process., vol.44, no.6, pp.428-435, Jun. 1997. [7] J. Tubbax, B. Come, L. Van der Perre, S. Donnay, M. Engels, H. De Man, and M. Moonen, 'Compensation of IQ imbalance and phase noise in OFDM systems,' IEEE Trans. Wireless Commun., vol.4, no.3, pp.872-877, May 2005. [8] J. Tubbax, B. Come, L. Van der Perre, S. Donnay, and M. Engels, 'IQ imbalance compensation for OFDM systems,' in Proc. IEEE ICC, vol.5, pp.3403-3407, May 2003. [9] J. Tubbax, A. Fort, L. V. der Perre, S. Donnay, M. Engel, M. Moonen, and H. D. Man, 'Joint compensation of IQ imbalance and frequency offset in OFDM systems,' presented at GLOBECOM, Dec. 2003. [10] P. H. Moose, 'A Technique for Orthogonal Frequency Division Multiplexing Frequency Offset Correction,' IEEE Trans. Commun., vol.42, no.10, pp.2908-2913, Oct. 1994. [11] J. J. van de Beek, M. Sandell and P. Ola BÄorjesson, 'ML Estimation of Time and Frequency Offset in OFDM Systems,' IEEE Trans. Signal Process., vol.45, no.7, pp.1800-1805, Jul. 1997. [12] T. Roman, S. Visuri and V. Koivunen, 'Blind Frequency Synchronization in OFDM via Diagonality Criterion,' IEEE Trans. Signal Process., vol.54, no.8, pp.3125-3135, Aug. 2006. [13] H. Liu and U. Tureli, 'A High-Efficiency Carrier Estimator for OFDM Communications,' IEEE Commun. lett., vol.2, no.4, pp.104-106, Apr. 1998. [14] J. H. Gunther, H. Liu and A. L. Swindlehurst, 'A New Approach for Symbol Frame Synchronization and Carrier Frequency Estimation in OFDM Communications,' IEEE Trans. Signal Process., vol.5, pp.2725-2728, Mar. 1999. [15] T.-C. Wu, 'Carrier Frequency Offset Estimation on OFDM Systems Using Virtual Carriers,' Master thesis, National Taiwan University, Jun. 2007. [16] U. Tureli, H. Liu and M. D. Zoltowski, 'OFDM Blind Carrier Offset Estimation: ESPRIT,' IEEE Trans. Commun., vol.48, no.9, pp.1459-1461, Sep. 2000. [17] J. Zhu and W. Lee, 'Carrier Frequency Offset Estimation for OFDM Systems with Null Subcarriers,' IEEE Trans. Vehicular Tech., vol.55, no.5, pp.1677-1690, Sep. 2006. [18] D. D. Huang and K. B. Letaief, 'Carrier Frequency Offset Estimation for OFDM Systems using Null Subcarriers,' IEEE Trans. Commun., vol.54, no.5, pp.813-822, May 2006. [19] S. M. Sameer and R. V. Raja Kumar, 'A Low Complexity Null Subcarrier Aided Frequency Offset Estimation Technique for OFDM,' in Proc. 67th IEEE Vehicular Tech. Conf., VTC-2008 Spring, Singapore, May 2008. [20] X. Ma, C. Tepedelenlioglu, G. B. Giannakis, and S. Barbarossa, 'Non Data-Aided Carrier Offset Estimators for OFDM with Null Subcarriers: Identifiability, Algorithms and Performance,' IEEE J. Sel. Areas Commun., vol.19, no.12, pp.2504-2515, Dec. 2001. [21] Y. Wu, S. Attallah, and J.W.M. Bergmans, 'On the Optimality of the Null Subcarrier Placement for Blind Carrier Offset Estimation in OFDM Systems,' IEEE Trans. Veh. Tech., vol.58, no.4, pp.2109-2115, May 2009. [22] M. Ghogho, and A. Swami, G. B. Giannakis, 'Optimizing null-subcarrier selection for CFO estimation in OFDM over frequency-selective fading channels,' in Proc. GLOBECOM, Nov. 2001. [23] Y. Chen, 'Frequency Offset Estimation Based on Virtual Carrier in OFDM System, IASP, pp.369-371, 2009. [24] T. Liu, and H. Li, 'Blind Carrier Frequency Offset Estimation in OFDM Systems with I/Q Imbalance, Signal Process., vol.89 no.11, pp.2286-2290, Nov. 2009. [25] A. Tarighat and A. H. Sayed, 'Joint Compensation of Transmitter and Receiver Impairments in OFDM Systems,' IEEE Trans. Wireless Commun., vol.6, no.1, pp.240-247, Jan. 2007. [26] R. O. Schmidt, 'Multiple emitter location and signal parameter estimation,' IEEE Trans. Antennas and Propagation, vol.34, no.3, pp.276-280, Mar. 1986. [27] W. Qiu, Y. Hua and K. Abed-Meraim, 'A Subspace Method for the Computation of the GCD of Polynomials,' Automatica : the journal of IFAC, the International Federation of Automatic Control, vol.33, no.4, pp.741-743, Apr. 1997. [28] B. Su, P. P. Vaidyanathan, 'A Generalized Deterministic Algorithm for Blind Channel Identification with Filter Bank Precoders,' in Proc. ISCAS, Kos Island, Greece, May 2006. [29] Y.-H. Chung, 'Estimation and Compensation of Front-end Nonidealities in OFDM Systems,' Doctoral Dissertation, National Taiwan University, July 2009. [30] W.-J. Cho, 'Timing Synchronization and Joint Estimation of I/Q Imbalance, Carrier Frequency Offset and Channel Response for Broadband Communication Systems,' Master thesis, National Taiwan University, Jun. 2007. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/45726 | - |
| dc.description.abstract | Recently, the direct-conversion transceiver for orthogonal frequency division multiplexing (OFDM) systems become more appealing because of its significant advantages in cost, package size, and power consumption. However, the direct-conversion receivers are very sensitive to non-idealities at analog front-end, such as in-phase and quadrature-phase (I/Q) imbalance and carrier frequency offset (CFO). These non-idealities destroy the subcarrier orthogonality of OFDM systems. As a result the performance of OFDM systems will degrade severely if these non-idealities are not properly compensated. Therefore, it is an important issue to precisely estimate and compensate these mismatches.
In this thesis, the effect of I/Q imbalance and CFO in OFDM systems are first studies, and then the estimation and compensation of these parameters are considered. We propose a semi-blind method for joint estimation of I/Q imbalance and CFO. In many practical communication systems, some carriers are not used for data transmission and instead zeros are transmitted on these carriers. These carriers are known as virtual carriers. In this thesis, we will exploit the virtual carriers for joint estimation of I/Q imbalance and CFO. The method is semi-blind because we only need to know the locations of these virtual carriers. Using these virtual carriers, we can improve the bandwidth efficiency without usage of any training sequences or pilots. By minimizing the cost function, the I/Q imbalance and CFO parameters can be estimated accurately. It is shown by simulation results that the performance of the proposed methods is better than other existing methods that also use virtual carriers. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-15T04:45:10Z (GMT). No. of bitstreams: 1 ntu-99-R97942037-1.pdf: 504516 bytes, checksum: 5e97f02ae5287dff80c2952fe4e3e4bc (MD5) Previous issue date: 2010 | en |
| dc.description.tableofcontents | List of Figures.....vii
Abstract.....xi Acknowledgements.....xiii 1 Introduction.....1 2 I/Q Imbalance and Carrier Frequency Offset in OFDM Systems.....5 2.1 Introduction to OFDM Systems.....6 2.2 The Phenomenon of I/Q Imbalance and CFO.....10 2.2.1 I/Q Imbalance.....12 2.2.2 Carrier Frequency Offset.....12 2.3 I/Q Imbalance and CFO on the Received Baseband Signal Model.....12 2.4 Compensation of I/Q Imbalance and CFO.....17 2.5 Simulation Results and Comparison.....18 2.6 Concluding Remarks.....21 3 CFO Estimation Using Virtual Carriers.....23 3.1 Introduction to Virtual Carriers.....24 3.2 CFO Estimation by MUSIC-Based Method.....26 3.2.1 MUSIC-Based Method [13].....26 3.2.2 Optimal Placement of Virtual Carriers [21][22].....27 3.2.3 Discussion on Virtual Carrier Selection.....28 3.3 CFO Estimation by Eigen Method [14].....34 3.4 CFO Estimation by Computing GCD [15].....35 3.5 Simulation Results and Comparison.....37 3.6 Concluding Remarks.....40 4 Joint Estimation of I/Q Imbalance and CFO Using Virtual Carriers.....41 4.1 Proposed Estimation Method of I/Q Imbalance.....42 4.2 Proposed Joint Estimation Method of I/Q Imbalance and CFO.....46 4.2.1 Proposed Joint Estimation Method.....46 4.2.2 Joint Estimation Using Conjugate-Symmetric Virtual Carriers.....48 4.2.3 Optimal Placement of Virtual Carriers.....51 4.3 Joint Estimation of I/Q Imbalance and CFO Using Virtual Carriers [24].....52 4.4 Proposed Joint Estimation Method of I/Q Imbalance and Residual CFO.....53 4.5 Simulation Results and Comparison.....57 4.6 Concluding Remarks.....69 5 Conclusions.....73 Bibliography.....75 | |
| dc.language.iso | en | |
| dc.subject | 虛擬載波 | zh_TW |
| dc.subject | 載波頻率偏移 | zh_TW |
| dc.subject | 實虛部非協調 | zh_TW |
| dc.subject | 正交分頻多工 | zh_TW |
| dc.subject | I/Q Imbalance | en |
| dc.subject | Virtual Carrier | en |
| dc.subject | OFDM | en |
| dc.subject | Carrier Frequency Offset | en |
| dc.title | 正交分頻多工系統中使用虛擬載波於實虛部非協調與載波頻率偏移之同估測 | zh_TW |
| dc.title | Joint Estimation of I/Q Imbalance and Carrier Frequency Offset Using Virtual Carriers for OFDM Systems | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 98-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 蘇炫榮(Hsuan-Jung Su),蘇柏青(Borching Su),鐘元暉(Yuan-Hwui Chung) | |
| dc.subject.keyword | 正交分頻多工,實虛部非協調,載波頻率偏移,虛擬載波, | zh_TW |
| dc.subject.keyword | OFDM,I/Q Imbalance,Carrier Frequency Offset,Virtual Carrier, | en |
| dc.relation.page | 78 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2010-08-06 | |
| 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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