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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 馮世邁(See-May Phoong) | |
| dc.contributor.author | Ting-Kang Chang | en |
| dc.contributor.author | 張庭綱 | zh_TW |
| dc.date.accessioned | 2021-06-13T05:44:36Z | - |
| dc.date.available | 2006-07-18 | |
| dc.date.copyright | 2006-07-18 | |
| dc.date.issued | 2006 | |
| dc.date.submitted | 2006-07-13 | |
| dc.identifier.citation | [1] Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: High-Speed Physical Layer in the 5-GHz Band, Dec. 1999. IEEE Std 802.11a-1999.
[2] Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications: Further Higher-Speed Physical Layer Extension in the 2.4 GHz Band, 2003. IEEE Std 802.11g-2003. [3] IEEE 802.15 Wireless Personal Area Networks (WPAN) High Rate Alternative PHY Task Group 3a (TG3a) [Online]. Available: http://www.ieee802.org/15/pub/TG3a [4] IEEE 802.20 Mobile Broadband Wireless Access (MBWA) [Online]. Available: http://grouper.ieee.org/groups/802/20 [5] IEEE 802.16 Wireless Metropolitan Area Networks (WirelessMAN) [Online]. Available: http://www.wirelessman.org/ [6] B. Razavi, RF Microelectronics. Englewood Cliffs, NJ: Prentice-Hall, 1998. [7] A. A. Abidi, Direct-conversion radio transceivers for digital communications, IEEE J. Solid-State Circuits, vol. 30, no. 12, pp. 1399-1410, Dec. 1995. [8] A. Tarighat and A. H. Sayed, MIMO OFDM receivers for systems with IQ imbalances, IEEE Trans. Signal Process., vol. 53, no. 9, Sep. 2005. [9] A. Baier, Quadrature mixer imbalances in digital TDMA mobile radio receivers, in Proc. Int. Zurich Seminar Digital Commun., Electronic Circuits Syst. Commun., Zurich, Switzerland, Mar. 1990, pp. 147-162. [10] C. L. Liu, Impacts of I/Q imbalance on QPSK-OFDM-QAM detection, IEEE Trans. Consum. Electron., vol. 44, no. 3, pp. 984-989, Aug. 1998. [11] A. Schuchert, R. Hasholzner, and P. Antoine, A novel IQ imbalance compensation scheme for the reception of OFDM signals, IEEE Trans. Consum. Electron., vol. 47, no. 3, pp. 313-318, Aug. 2001. [12] S. Fouladifard and H. Shafiee, Frequency offset estimation in OFDM systems in presence of IQ imbalance, in Proc. IEEE Int. Conf. Commun., vol. 3, Anchorage, AK, May 2003, pp. 2071-2075. [13] M. J. M. Pelgrom, A. C. J. Duinmaijer, and A. P. G. Welbers, ”Matching properties of MOS transistors,” IEEE J. Solid-State Circuits, vol. 24, no. 5, pp. 1433-1439, Oct. 1989. [14] 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, Feb. 2003. [15] 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, Feb. 2003. [16] Li-Hsiang Lee, ”Performance study of OFDM and SC-CP systems in nonideal transmission environment,” 2005 [17] Yuan-Pei Lin and See-May Phoong, ”BER minimized OFDM systems with channel independent precoders,” IEEE Transactions on Signal Processing, volume 51, issue 9, pp.2369-2380, September 2003. [18] J. Tubbax, B. Come, L. Van der Perre, S. Donnay, and M. Engels, ”IQ imbalance compensation for OFDM systems,” in Proc. IEEE Int. Conf. Communications (ICC), vol. 5, May 2003, pp. 3403-3407 [19] A. Tarighat, R. Bagheri, and A. H. Sayed, ”Compensation schemes and Performance Analysis of IQ imbalances in OFDM Receivers,” IEEE Transactions on Signal Processing, volume 53, August 2005. [20] P. Vandenameele, L. Van der Perre, and M. Engels, ”Space Division Multiple Access for Wireless Local Area Networks,” ser. Kluwer International Series in Engineering and Computer Science. Norwell, MA: Kluwer, 2001 [21] Wireless LAN Medium Access Control and Physical Layer Specifications: High-Speed Physical Layer in the 5 GHz Band, IEEE Standard 802.11a-1999 Part II, Sep. 1999 [22] J. Coon, M. Beach and J. McGeehan, ”Optimal Training Sequences for Channel Estimation in Cyclic-Prefix-Based Single-Carrier Systems With Transmit Diversity,” IEEE Signal Processing Letters, vol. 11, no. 9, September 2004 [23] W. Liu, L. Yang and L. Hanzo, ”Wideband Channel Estimation and Prediction in Single-CarrierWireless Systems,” [24] Y. Zeng and T. S. Ng, ”Pilot Cyclic Prefixed Single Carrier Communication: Channel Estimation and Equalization,” IEEE Signal Processing Letters, vol. 12, no. 1, January 2005 [25] D. C. Chu, ”Polyphase Codes with Good Periodic Correlation Properties,” IEEE Trans. Inform. Theory, vol. IT-18, pp. 531-532, July 1972. | |
| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33686 | - |
| dc.description.abstract | Nowadays, a lot of effort is spent on developing inexpensive OFDM receivers. Especially, zero-IF receivers are very appealing, because they avoid costly IF filters.
However, zero-IF front-ends also introduce significant additional front-end distortion, such as IQ imbalance. Unfortunately, OFDM is very sensitive to nonidealities (IQ imbalances) in the receiver front-end. An important effect of IQ imbalances is that achievable BER saturates as the SNR increases, suggesting that the system’s performance at high SNR will be dominated by the IQ imbalances rather than the operating SNR. In this thesis, the effect of IQ imbalances on OFDM receivers is studied, and a framework for deriving OFDM receivers with IQ imbalance correction in the digital domain was presented. We propose three new schemes for joint IQ imbalance compensation and channel estimation. Previous method is sensitive to channels with nonflat frequency response. Besides leading to performance enhancements, our approaches are robust against channels with highly nonflat frequency response with low complexity. Additionally, one or two OFDM training block provides sufficient information to accurately estimate the IQ imbalances and the channel response, allowing to shorten the training time. Therefore, our methods greatly relaxes the mismatch specifications and thus enable zero-IF receivers employing cheap analog components. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-13T05:44:36Z (GMT). No. of bitstreams: 1 ntu-95-R93942079-1.pdf: 2077399 bytes, checksum: 6b95cd76c4065f4d3e4bd66d693a5c42 (MD5) Previous issue date: 2006 | en |
| dc.description.tableofcontents | 1 Introduction . . . 1
2 IQ Imbalance and Its Impact on OFDM Systems . . . 5 2.1 Why IQ Imbalance ? . . . 6 2.1.1 Effect of IQ Imbalance on the Received Baseband Signal . . . 8 2.2 Introduction to OFDM Systems . . . 10 2.3 Introduction to SC-CP Systems . . . 15 2.4 Impacts of IQ Imbalance on OFDM and SCCP Systems . . . 17 2.5 Compensation of IQ Imbalances Effect . . . 21 2.5.1 Compensation with K1, K2 Known [18] . . . 21 2.5.2 Compensation with K2 K¤1 Known . . . 24 2.5.3 Adaptive Compensation [19] . . . 25 2.5.4 Least-Squares Compensation [19] . . . 26 3 Joint IQ Imbalance and Channel Estimation for OFDM Systems . . . 27 3.1 Some Existing Methods . . . 28 3.1.1 Post-FFT Estimation [19] . . . 28 3.1.2 Estimation for Channels with Smooth Frequency Responses [18] . . . 29 3.2 Proposed Methods for Joint IQ Imbalance and Channel Estimation . . . 41 3.2.1 Method 1 . . . 41 3.2.2 Method 2 . . . 44 3.2.3 Time-Domain Estimation Method . . . 56 3.3 Simulation Results and Comparison . . . 68 3.3.1 OFDM Systems . . . 69 3.3.2 SC-CP Systems . . . 74 4 Conclusion . . . 83 Bibliography . . . 85 | |
| dc.language.iso | en | |
| dc.subject | 前置迴旋碼單載波系統 | zh_TW |
| dc.subject | 正交分頻多工系統 | zh_TW |
| dc.subject | 實虛部非協調 | zh_TW |
| dc.subject | OFDM | en |
| dc.subject | SC-CP | en |
| dc.subject | IQ imbalance | en |
| dc.title | 寬頻通訊系統中實虛部非協調與通道響應之同估測 | zh_TW |
| dc.title | Joint Estimation of IQ Imbalance and Channel Response for Wideband Communication Systems | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 94-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 王晉良(Chin-Liang Wang),祁忠勇(Chong-Yung Chi),蘇炫榮(Hsuan-Jung Su) | |
| dc.subject.keyword | 實虛部非協調,正交分頻多工系統,前置迴旋碼單載波系統, | zh_TW |
| dc.subject.keyword | IQ imbalance,OFDM,SC-CP, | en |
| dc.relation.page | 87 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2006-07-16 | |
| 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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| ntu-95-1.pdf 未授權公開取用 | 2.03 MB | Adobe PDF |
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