博碩士論文 985203021 詳細資訊




以作者查詢圖書館館藏 以作者查詢臺灣博碩士 以作者查詢全國書目 勘誤回報 、線上人數:8 、訪客IP:13.59.183.186
姓名 劉瀚升(Han-sheng Liu)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 針對WLAN OFDM系統之I/Q不平衡與載波頻率偏移補償與其電路設計與實現
(Design and Implementation of Joint IQ Imbalance and Carrier Frequency Offset Compensation for WLAN OFDM Systems)
相關論文
★ 利用二元關聯法之簡易指紋辨識★ 基於數位單脈衝接收機與質點演算法之無人機追蹤效能分析
★ 基於輔助波束對之UAV追蹤方法實現★ 使用MMSE等化器的Filterbank OFDM系統探討
★ Kalman Filtering應用於可適性載波同步系統之研究★ 無線區域網路之MIMO-OFDM系統設計與電路實現
★ 包含通道追蹤之IEEE 802.11a接收機設計與電路實現★ 時變通道下的OFDM傳輸系統設計: 基於IEEE 802.11a標準
★ MIMO-OFDM系統各天線間載波頻率偏差之探討 與收發機硬體實現★ 使用雜散式領航訊號之DVB-T系統通道估測演算法與電路實現
★ 數位地面視訊廣播系統同步模組 之設計與電路實現★ 適用於移動式正交分頻多工通訊系統的改良型時域通道響應追蹤演算法
★ 正交分頻多工系統通道估測基於可適性模型化通道參數估測★ 以共同項載波頻率偏移補償於正交分頻多重存取系統中減少多重存取干擾之方法
★ 正交分頻多工系統之資料訊號裁剪雜訊消除★ 適用於正交分頻多工通訊系統的改良型決策反饋之卡爾曼濾波通道估測器
檔案 [Endnote RIS 格式]    [Bibtex 格式]    [相關文章]   [文章引用]   [完整記錄]   [館藏目錄]   [檢視]  [下載]
  1. 本電子論文使用權限為同意立即開放。
  2. 已達開放權限電子全文僅授權使用者為學術研究之目的,進行個人非營利性質之檢索、閱讀、列印。
  3. 請遵守中華民國著作權法之相關規定,切勿任意重製、散佈、改作、轉貼、播送,以免觸法。

摘要(中) 正交分頻多工(Orthogonal Frequency Division Multiplexing, OFDM) 技術,已經廣泛使用於現代的無線網路實體層中,在射頻電路的架構方面,直接轉換接收機(Direct-conversion) 也越來越受到廣泛的使用,因其具備低成本與小面積等優點。伴隨著此結構容易受到射頻元件與震盪電路的誤差帶來IQ 不平衡(IQ Imbalance)、直流偏移(DC Offset) 與載波頻率偏移(Carrier Frequency Offset) 等問題,降低接收機性能。因此在本篇論文,提出了使用訓練符元以最小平方(Least square) 做參數估計,達到在無線區域
網路系統中快速同步的目的,並且較現有演算法有更好的效能。最後,基於我們的演算法提出同步電路架構,並以VHDL 撰寫RTL 驗證我們的電路結構效能。
摘要(英) Orthogonal Frequency Division Multiplexing (OFDM) is a widely used technique in the physical layer of modern communication system. Unfortunately,OFDM system is sensitive to imperfect synchronization and non-ideal front-end effects such as IQ Imbalance, DC Offset and carrier frequency offset, leading to serve system performance degradation. In this thesis, we consider recovering the WLAN OFDM signals in the presence of these imperfect conditions, we propose least-square (LS) equalization for Joint IQ Imbalance and carrier frequency offset estimation. From computer simulation results, the proposed algorithm has better performance than existing algorithms. Finally, the VHDL Design is used to verity the feasibility in electric circuit structure.
關鍵字(中) ★ 直接轉換接收器
★ 正交分頻多工系統
★ IQ不平衡
★ 載波頻率偏移
關鍵字(英) ★ OFDM
★ IQ Imbalance
★ IQ Mismatch
★ Carrier frequency offset
★ Direct Conversion
論文目次 目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
圖目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . .II
表目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . .IV
第1 章序論. . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 前言. . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 章節架構. . . . . . . . . . . . . . . . . . . . . . . . . 3
第2 章系統模型. . . . . . . . . . . . . . . . . . . . . . . . 5
2.1 OFDM 系統簡介. . . . . . . . . . . . . . . . . . . . . . .5
2.2 I/Q Imbalance 效應. . . . . . . . . . . . . . . . . . . . 8
2.3 系統與訊號模型. . . . . . . . . . . . . . . . . . . . . .12
2.4 IQ 不平衡在OFDM 系統上的影響. . . . . . . . . . . . . . .17
第3 章IQ 不平衡與載波頻率偏移估計補償. . . . . . . . . . . . 23
3.1 在IQ 不平衡情形下之載波頻率偏移估計法. . . . . . . . . . 23
3.1.1 IQ 不平衡情形下的載波頻率偏移估計法一. . . . . . . . . 26
3.1.2 IQ 不平衡情形下的載波頻率偏移估計法二. . . . . . . . . 28
3.2 已有的結合IQ 不平衡/載波頻率偏移參數估計與補償法. . . . .31
3.2.1 IQ-CFO compensation scheme in time domain . . . . . . 32
3.2.2 Least-square based Joint Estimation in time domain . . 35
3.2.3 Decision-Directed Estimation in frequency domain . . . 38
3.2.4 minimization Channel Residual Energy in time domain. . 39
3.3 所提出的結合IQ 不平衡/載波頻率偏移參數估計與補償法. . . .42
3.3.1 改良Least-square based 演算法. . . . . . . . . . . . . 43
3.3.2 minimization Channel Residual Energy . . . . . . . . . 48
第4 章系統模擬與分析. . . . . . . . . . . . . . . . . . . . .52
4.1 系統模擬參數與環境. . . . . . . . . . . . . . . . . . . .52
4.2 模擬結果. . . . . . . . . . . . . . . . . . . . . . . . .53
4.2.1 載波頻率偏移估計. . . . . . . . . . . . . . . . . . . .54
4.2.2 IQ 不平衡估計. . . . . . . . . . . . . . . . . . . . . 57
4.3 結合IQ 不平衡與載波頻率偏移估計. . . . . . . . . . . . . 60
4.3.1 系統效能比較. . . . . . . . . . . . . . . . . . . . . .63
第5 章硬體的架構與設計. . . . . . . . . . . . . . . . . . . .66
5.1 接收機系統架構介紹. . . . . . . . . . . . . . . . . . . .66
5.2 各演算法的模組電路架構設計. . . . . . . . . . . . . . . .68
5.2.1 最小平方誤差估計模組. . . . . . . . . . . . . . . . . .68
5.2.2 IQ 不平衡估計使用minimization Channel Residual Energy 76
5.2.3 IQ 不平衡與載波頻率偏移補償模組. . . . . . . . . . . . 84
5.3 各模組電路定點數分析. . . . . . . . . . . . . . . . . . 87
5.4 MATLAB/Modelsim 整合驗證. . . . . . . . . . . . . . . . 91
5.5 FPGA 電路合成報告. . . . . . . . . . . . . . . . . . . .100
第6 章結論. . . . . . . . . . . . . . . . . . . . . . . . . 105
參考文獻. . . . . . . . . . . . . . . . . . . . . . . . . . 106
附錄A:CORDIC 演算法. . . . . . . . . . . . . . . . . . . . 110
附錄B:混合式CORDIC 演算法. . . . . . . . . . . . . . . . . 113
參考文獻 [1] B. Razavi, “Design considerations for direct-conversion receivers,”IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing, vol. 44, no. 6, pp. 428 –435, Jun 1997.
[2] S.-L. Su and Y.-J. Chiu, “Adaptive iq imbalance compensation scheme with frequency offset for communication channel,” in 2006. CCNC 2006. 3rd IEEE Consumer Communications and Networking Conference,, vol. 2, Jan. 2006, pp. 1038 –1042.
[3] Y.-J. Chiu and S.-P. Hung, “Estimation scheme of the receiver iq imbalance under carrier frequency offset in communication system,”IET Communications, vol. 4, no. 11, pp. 1381 –1388, 23 2010.
[4] J.-R. Liang and C.-H. Kuo, “Ls-based joint estimation of carrier frequency offset and iq imbalance in ofdm systems,”in 2010 International Symposium on Next-Generation Electronics (ISNE), Nov.2010, pp. 52 –55.
[5] Y.-H. Chung, K.-D. Wu, and S.-M. Phoong, “Joint estimation of i/q imbalance, cfo and channel response for ofdm systems,”in IEEE International Conference on Acoustics Speech and Signal Processing,2009. ICASSP 2009., April 2009, pp. 2573 –2576.
[6] L. Lanante, M. Kurosaki, and H. Ochi, “A new joint estimation scheme for carrier frequency offset and i/q imbalance,”in IEEE International Conference on Communications, 2009. ICC '09., June 2009, pp. 1 –5.
[7] G.-T. Gil, I.-H. Sohn, J.-K. Park, and Y. Lee, “Joint ml estimation of carrier frequency, channel, i/q mismatch, and dc offset in communication receivers,”IEEE Transactions on Vehicular Technology,vol. 54, no. 1, pp. 338 –349, Jan. 2005.
[8] J. Tubbax, B. Come, L. Van der Perre, L. Deneire, S. Donnay, and M. Engels, “Compensation of iq imbalance in ofdm systems,”in IEEE International Conference on Communications, 2003. ICC'03., vol. 5, May 2003, pp. 3403 –3407 vol.5.
[9] J. Tubbax, A. Fort, L. Van der Perre, S. Donnay, M. Engels,M. Moonen, and H. De Man, “Joint compensation of iq imbalance and frequency offset in ofdm systems,”in 2003. GLOBECOM '03.IEEE Global Telecommunications Conference, vol. 4, Dec. 2003,pp. 2365 –2369 vol.4.
[10] Y. Egashira, Y. Tanabe, and K. Sato, “A novel iq imbalance compensation method with pilot-signals for ofdm system,” in 2006 IEEE 64th Vehicular Technology Conference, 2006. VTC-2006 Fall., Sept. 2006, pp. 1 –5.
[11] S. Traverso, M. Ariaudo, I. Fijalkow, J.-L. Gautier, and C. Lereau,“Decision-directed channel estimation and high i/q imbalance compensation in ofdm receivers,”IEEE Transactions on Communications,vol. 57, no. 5, pp. 1246 –1249, May 2009.
[12] D. Tandur and M. Moonen, “Joint adaptive compensation of transmitter and receiver iq imbalance under carrier frequency offset in ofdm-based systems,”IEEE Transactions on Signal Processing,vol. 55, no. 11, pp. 5246 –5252, Nov. 2007.
[13] K.-Y. Sung and C. chao Chao, “Estimation and compensation of i/q imbalance in ofdm direct-conversion receivers,”IEEE Journal of Selected Topics in Signal Processing, vol. 3, no. 3, pp. 438 –453,June 2009.
[14] J. Chang and I.-T. Lu, “Analysis of a virtual carrier based carrier frequency offset estimation algorithm in the presence of i/q imbalance in ofdm systems,”in 2008 IEEE Sarnoff Symposium, April
2008, pp. 1 –5.
[15] M. Valkama, M. Renfors, and V. Koivunen, “Blind i/q imbalance compensation in ofdm receivers based on adaptive i/q signal decorrelation,”in 2005. ISCAS 2005. IEEE International Symposium on Circuits and Systems, May 2005, pp. 2611 –2614 Vol. 3.
[16] P. Rykaczewski, M. Valkama, and M. Renfors, “On the connection of i/q imbalance and channel equalization in direct-conversion transceivers,”IEEE Transactions on Vehicular Technology, vol. 57,no. 3, pp. 1630 –1636, May 2008.
[17] M.-F. Sun, J.-Y. Yu, and T.-Y. Hsu, “Estimation of carrier frequency offset with i/q mismatch using pseudo-offset injection in ofdm systems,”IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 55, no. 3, pp. 943 –952, April 2008.
[18] Y. Chen, A. Jayalath, J. Zhang, and T. Pollock, “Frequency offset estimation for ofdm systems in the presence of i/q mismatch,”in IEEE 18th International Symposium on Personal Indoor and Mobile Radio Communications, 2007. PIMRC 2007., Sept. 2007, pp. 1
–5.
[19] Y.-C. Pan and S.-M. Phoong, “A new algorithm for carrier frequency offset estimation in the presence of i/q imbalance,”in 2010 IEEE 71st Vehicular Technology Conference (VTC 2010-Spring),May 2010, pp. 1 –5.
[20] W.-J. Cho, T.-K. Chang, Y.-H. Chung, S.-M. Phoong, and Y.-R. Lin,“Frame synchronization and joint estimation of iq imbalance and channel response for ofdm systems,”in IEEE International Conference on Acoustics Speech and Signal Processing, 2008. ICASSP 2008., 31 2008-April 4 2008, pp. 3029 –3032.
[21] Y.-H. Chung and S.-M. Phoong, “Joint estimation of transmitter and receiver i/q imbalances, cfo, and channel response for ofdm systems,”in 2010 International Conference on Green Circuits and Systems (ICGCS), June 2010, pp. 247 –252.
[22] IEEE 802.11a, Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications : High-speed Physical Layer in the 5 GHz Band., IEEE Std., 1999.
[23] J. E. Volder, “The cordic trigonometric computing technique,”IRE Transactions on Electronic Computers, vol. EC-8, no. 3, pp.330 –334, Sept. 1959.
[24] S. Wang, V. Piuri, and J. Wartzlander, E.E., “Hybrid cordic algorithms,”IEEE Transactions on Computers, vol. 46, no. 11, pp.1202 –1207, Nov 1997.
指導教授 張大中(Dah-Chung Chang) 審核日期 2011-8-24
推文 facebook   plurk   twitter   funp   google   live   udn   HD   myshare   reddit   netvibes   friend   youpush   delicious   baidu   
網路書籤 Google bookmarks   del.icio.us   hemidemi   myshare   

若有論文相關問題,請聯絡國立中央大學圖書館推廣服務組 TEL:(03)422-7151轉57407,或E-mail聯絡  - 隱私權政策聲明