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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 馮世邁 | |
dc.contributor.author | Yi-Fan Jian | en |
dc.contributor.author | 簡翊帆 | zh_TW |
dc.date.accessioned | 2021-06-13T05:49:17Z | - |
dc.date.available | 2012-07-29 | |
dc.date.copyright | 2011-07-29 | |
dc.date.issued | 2011 | |
dc.date.submitted | 2011-07-26 | |
dc.identifier.citation | [1] European Telecommunication Standards Institude, 'Digital audio broadcasting (DAB) to mobile protable and xed receiverd,' EST 300 401, 1994.
[2] 'Digital vedio broadcasting (DVB); Framing structure, channel coding and modulation for terrestrial television,' European Standard (EN) 300 744 V1.6.1, European Telecommunications Standards Institue (ETSI), Final draft, 2008. [3] Part 11: Wireless LAN medium access control (MAC) and physical layer (PHY) speci cations. High-speed physical layer in the 5 GHz band IEEE Standard 802.11a-1999, 1999. [4] L. Der and B. Razavi, 'A 2-GHz CMOS image-reject receiver with LMS calibration,' IEEE J. Solid-State Circuits, vol. 38, no. 2, pp. 167-175, February 2003. [5] Z. Pengfei, N. Thai, C. Lam, D. Gambetta, C. Soorapanth, C. Baohong, S. Hart, I. Sever, T. Bourdi, A. Tham, and B. Razavi, 'A direct conversion CMOS transceiver for IEEE 802.11a WLANs,' in IEEE Int. Solid-State Circuits Conf. Dig Technical papers, February 2003. [6] Ferdinand Classen and Heinrich Meyr, 'Frequency Synchronization Algorithms for OFDM Systems suitable for Communication over Frequency Selective Fading Channels,' Proc. 1994 IEEE 44th Vehicular Technology Conf., pp. 1655-1659, 1994. [7] SAMAN S. ABEYSEKERA, 'Performance of Pulse-Pair Method of Doppler Estimation,' IEEE Trans. Aerosp. Electron. Syst., vol. 34, pp. 520-531, 1998. [8] T. Cui and C. Tellambura, 'Robust joint frequency offset and channel estimation for OFDM systems,' Proc. Veh. Technol. Conf., vol. 1, pp. 603-607, 2004. [9] T. Cui and C. Tellambura, 'Joint frequency offset and channel estimation for OFDM systems using pilot symbols and virtual carriers,' IEEE Trans. Wireless Communications, vol. 6, pp. 1193-1202, 2007. [10] Tao Cui, Feifei Gao and A. Nallanathan, 'Frequency Offset Tracking for OFDM Systems via Scattered Pilots and Virtual Carriers,' Proc. ICC07, pp. 5120-5125, 2007. [11] F. Gao, T. Cui and A. Nallanathan, 'Scattered pilots and virtual carriers based frequency off set tracking for OFDM systems: Algorithms, identi ability and performance analysis,' IEEE Trans. Commun., vol. 56, pp. 619-629, 2008. [12] Qiuping Zhu, Weibing Wang and Yaxian Liu, 'A New Fast CFO Tracking Algorithm for OFDM Systems,' 2010 6th International Wireless Communications Networking and Mobile Computing (WiCOM) Conf., pp. 1-3, 2010. [13] Wei Zhang, Xiang-Gen Xia and Ching, P.C, 'Clustered pilot tones for carrier frequency o ffset estimation in OFDM systems,' IEEE Transctions on Wiress Communications., no.1, pp. 101-109, January 2007. [14] Yuan-Hwui Chung and See-May Phoong, 'OFDM Channel Estimation in The Presence of I/Q Imbalance and CFO Using Pilot Symbols,' submitted to IEIC. [15] D. Donoho, 'On minimum entropy deconvolution,' Applied TimeSeries Analysis II, New York: Academic pp. 569-609, 1981. [16] Y. Yao and G. B. Giannakis, 'Blind carrier frequency offset estimation in SISO, MIMO, and multiuser OFDM systems,' IEEE Trans. Commun., pp. 173-183, 2005. [17] L. Wu, X.-D. Zhang, P.-S. Li, and Y.-T. Su, 'A blind CFO estimator based on smoothing power spectrum for ofdm systems,' IEEE Trans. Commun., pp. 1924-1927, July 2009. [18] X. Zeng and A. Ghrayeb, 'A blind carrier frequency offset estimation scheme for OFDM systems with constant modulus signaling,' IEEE Trans. Commun., vol. 56, pp. 1032, 2008. [19] A. Al-Dweik , A. Hazmi , S. Younis , B. Sharif and C. Tsimenidis, 'Carrier frequency off set estimation for OFDM system over mobile radio channels,' IEEE Trans. Veh. Technol., vol. 59, pp. 974-979, July 2010. [20] Xu, W.; Hong, Z., 'Blind CFO Estimation for Constant Modulus Signaling Based OFDM Systems ,' Proc. of IEEE-ICC., 2010. [21] L. Wu, X.-D. Zhang, P.-S. Li, and Y.-T. Su, 'A Closed-form Blind CFO Estimator Based on Frequency Analysis for OFDM Systems,' IEEE Trans. Commun., vol. 57, pp. 1634-1637, June 2009. [22] T. Roman and V. Koivunen, 'Subspace method for blind CFO estimation for OFDM systems with constant modulus constellations,' Proc. IEEE Vehicular Technology Conf., vol. 42, pp. 1253-1257, May 2005. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33929 | - |
dc.description.abstract | 正交分頻多工(OFDM)技術能夠提供良好的頻譜效益,以及避免多路徑傳輸所造成的影響。在本論文中,我們考量了兩個正交分頻多工系統中的非理想效應:載波頻率偏移(Carrier Frequency Offset)與實虛部非協調 (IQ imbalance)。此兩種非理想效應都會對系統效能產生嚴重影響。
首先我們根據領航子載波的特性,提出演算法來分別及聯合估測載波頻率偏移與實虛部非協調。接下來,根據L. Wu和 X.-D. Zhang在2009年提出盲蔽式(blind)頻率偏移估測法 [20],我們將此方法延伸至非定值模數(Non-constant modulus)系統中。最後根據模擬結果,我們演算法的效能都比某些現存的方法還要好或是運算複雜度更低。 | zh_TW |
dc.description.abstract | Recently, the direct-conversion transceiver of 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. The results of this thesis consist of three parts. In many practical communication systems, some carriers are not used for data transmission and instead certain signal known to the receivers are transmitted on these carriers. These subcarriers are known as pilot subcarriers. In Part I, we propose a CFO estimation method using pilot subcarriers. In Part II, we will exploit these pilot subcarriers for the joint estimation of I/Q imbalance and CFO. In Part III, first, we proposed a blind CFO estimation method in QAM-OFDM systems which can improve the bandwidth efficiency without usage of any training sequences or pilots. Next, we proposed a CM (constant-modulus) pilot-aided CFO estimator. Finally the performance of the proposed method will be compared with the other existing methods that also use pilots or being blind. | en |
dc.description.provenance | Made available in DSpace on 2021-06-13T05:49:17Z (GMT). No. of bitstreams: 1 ntu-100-R98942122-1.pdf: 8723563 bytes, checksum: e3ca20cbaecb16d4277b02ce054eb36c (MD5) Previous issue date: 2011 | en |
dc.description.tableofcontents | List of Figures . . . . . . . . . . . . . vii
Abstract . . . . . . . . . . . . . xi Acknowledgments . . . . . . . . . . . . . xiii 1 Introduction . . . . . . . . . . . . . 1 2 I/Q Imbalance and Carrier Frequency Offset in OFDM Systems . . . . . . . 5 2.1 Introduction to OFDM Systems . . . . . . . . . . . . . . . . . . . . . 7 2.2 I/Q Imbalance and Carrier Frequency Offset . . . . . . . . . . . . . . 11 2.3 Compensation of I/Q Imbalance and CFO . . . . . . . . . . . . . . . 14 2.4 Simulation Results and Comparison . . . . . . . . . . . . . . . . . . . 15 2.5 Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3 CFO Estimation Using Pilot Subcarriers . . . . . . . . . . . . . 19 3.1 CFO Estimation by Pulse-Pair Method [6] . . . . . . . . . . . . . . 20 3.2 CFO Estimation by Maximum Likelihood(ML) Method [8] . . . . . . 22 3.3 Proposed CFO Estimation Method . . . . . . . . . . . . . . . . . . . 24 3.3.1 Proposed Estimation Method . . . . . . . . . . . . . . . . . . 24 3.3.2 Approximation Using Curve Fitting . . . . . . . . . . . . . . . 25 3.3.3 Approximation Using Taylor Expansion . . . . . . . . . . . . . 31 3.4 Simulation Results and Comparison . . . . . . . . . . . . . . . . . . . 33 3.5 Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 4 Joint Estimation of I/Q Imbalance and CFO Using Pilot Subcarriers . . . . . . . . . . . . . 47 4.1 Proposed Estimation Method of I/Q Imbalance . . . . . . . . . . . . 48 4.2 Proposed Joint Estimation Method of I/Q Imbalance and CFO . . . . 51 4.2.1 Proposed Joint Estimation Method . . . . . . . . . . . . . . . 51 4.2.2 Joint Estimation Using Conjugate-Symmetric Pilot Subcarriers 54 4.2.3 Approximation Using Curve Fitting . . . . . . . . . . . . . . . 56 4.2.4 Approximation Using Taylor Expansion . . . . . . . . . . . . . 60 4.3 Simulation Results and Comparison . . . . . . . . . . . . . . . . . . . 62 4.4 Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 5 Blind CFO Estimation in QAM-OFDM Systems 79 5.1 Blind CFO Estimation Schemes . . . . . . . . . . . . . . . . . . . . . 80 5.1.1 Blind CFO Estimation by Kurtosis Method [16] . . . . . . . . 80 5.1.2 Blind CFO Estimation by SPS Method [17] . . . . . . . . . . 81 5.1.3 Blind CFO Estimation by PDE Method [19] . . . . . . . . . . 82 5.2 Proposed Blind CFO Estimation Method . . . . . . . . . . . . . . . . 83 5.2.1 Blind CFO Estimation by FA Method [21] . . . . . . . . . . . 83 5.2.2 Proposed Blind Estimation Method . . . . . . . . . . . . . . . 84 5.2.3 Proposed Pilot-Aided Estimation Method . . . . . . . . . . . 87 5.3 Simulation Results and Comparison . . . . . . . . . . . . . . . . . . . 89 5.4 Concluding Remarks . . . . . . . . . . . . . . . . . . . . . . . . . . . 97 6 Conclusions . . . . . . . . . . . . . 99 Bibliography . . . . . . . . . . . . . 101 | |
dc.language.iso | en | |
dc.title | 正交分頻多工系統中使用領航子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 Pilot Subcarriers for OFDM Systems | en |
dc.type | Thesis | |
dc.date.schoolyear | 99-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 蘇炫榮,蘇柏青,鐘元暉 | |
dc.subject.keyword | 正交分頻多工,實虛部非協調,載波頻率偏移,領航子載波, | zh_TW |
dc.subject.keyword | OFDM,I/Q Imbalance,Carrier Frequency Offset,Pilot Subcarrier,Pilot Symbol, | en |
dc.relation.page | 103 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2011-07-26 | |
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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