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

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：7

、訪客IP：3.137.180.32

姓名

李淑惠(shiu-Hui Lee) 查詢紙本館藏

畢業系所

通訊工程學系在職專班

論文名稱

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
(Modified Decision Feedback Method for OFDM Channel Estimation with the Kalman Filter)

相關論文

★ 利用二元關聯法之簡易指紋辨識	★ 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	★ 半盲目通道追蹤演算法使用於正交分頻多工系統
★ 正交分頻多重存取以共同項載波頻率偏移補償以達到最小均方誤差之方法	★ 以共同載波頻率偏移修正於交錯分配正交分頻多重存取系統

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]

本電子論文使用權限為同意立即開放。
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。
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)

在正交分頻多工通訊系統中，部分的頻寬會犧牲給訓練符號(training symbols)作為通道估計之用。為了減少訊練序列的長度同時提升頻寬的使用率，我們利用決策反饋機制(Decision-Feedback)改良的卡爾曼濾波(Kalman Filter)時域通道響應追蹤估測器。在卡爾曼濾波估測器中，增加使用調適性變異數估測(adaptive variance estimation)及以提升估測器的精確性，以錯誤檢測器來偵測決策錯誤，並提出補償方法來避免決策錯誤的蔓延(Decision-error propagation)。在實驗模擬中，我們比較所提出的檢測器與補償方法在不同的通道模型中的性能效果，用以呈現所提方法之效能。

摘要(英)

In an orthogonal frequency division multiplexing (OFDM) system, part of bandwidth is occupied by training symbols for channel estimation. In order to reduce the period of the training sequence while improving the bandwidth efficiency, we study a new time-domain channel tracking algorithm using a Kaman filter in the modified decision-feedback loop. In company with adaptive variance estimation in the Kalman filter for enhancing channel estimation, some decision error detectors and compensation methods are proposed for avoiding decision error propagation to reduce the error probability. In simulation results, we compare the performances of the proposed decision error detectors and compensation methods for different channel models to show the efficiency of the proposed algorithm

關鍵字(中)

★ 決策反饋裝置
★ 卡爾曼濾波通道估測器
★ 正交分頻多工通訊系統

關鍵字(英)

★ Kalman Filter
★ Channel Estimation
★ OFDM
★ Decision Feedback Method

論文目次

第一章緒論 ……………………………………………………………………… 1
1.1 前言 …………………………………………………………………………1
1.2 各章節概要 ………………………………………………………………… 2
第二章基於決策反饋的傳統通道估測 ………………………………………… 3
2.1 決策反饋裝置 ……………………………………………………………… 3
2.2 頻域上的LS估測裝置……………………………………………………… 5
2.3 時域上的LS估測裝置……………………………………………………… 8
第三章卡爾曼濾波通道估測系統 …………………………………………… 12
3.1 通道估測系統 …………………………………………………………… 12
3.2 KF變異數之調適性估測 ………………………………………………… 15
3.3 KF追蹤樣品數量的調整與定義 ………………………………………… 19
3.4 突然變動的偵測 ………………………………………………………… 22
3.5 錯誤發生的修正補償 …………………………………………………… 26
第四章模擬與分析 …………………………………………………………… 31
4.1 環境參數與設定 ………………………………………………………… 31
4.2 模擬結果-AWGN通道 …………………………………………………… 35
4.3 模擬結果-類脈衝雜訊(Impluse-like noise)通道 ……………………… 40
4.4 模擬結果-窄頻雜訊(Narrow-band noise)通道 ………………………… 43
第五章結論 …………………………………………………………………… 47
參考文獻 ………………………………………………………………………… 48

參考文獻

[1] A. de Baynast, A. Sabharwal, and B. Aazhang, “Analysis of Decision-Feedback Based Broadband OFDM Systems,” in The 39th Asilomar Conference on Signals, Systems and Computers, 28 Oct. –1 Nov., 2005, pp. 692-696
[2] T. Roman, M. Enescu, and V. Koivunen, “Time-domain method for tracking dispersive channels in OFDM systems,” in The 57th IEEE Semiannual Vehicular Technology Conference, vol. 2, 22-25 April 2003, pp. 1318-1321
[3] Z. S. Lin, T. L. Hong, and D.C. Chang, “Design of an OFDM System With Long Frame by the Decision-Aided Channel Tracking Algorithm,” in The 6th IEEE International Conference on Electro/Information Technology (EIT 2006), East Lansing, MI USA, 7-10 May 2006.
[4] S. Werner, M. Enescu, and V. Koivunen, “Low-complexity time-domain channel estimators for mobile wireless OFDM systems,” in IEEE Workshop on Signal Processing Systems Design and Implementation, vol. 2, Nov. 2005, pp. 245-250.
[5] Y. Zheng, “A novel channel estimation and tracking method for wireless OFDM systems based on pilots and Kalman filtering,” IEEE Transactions on Consumer Electronics, vol. 49, No. 2, pp. 275–283, May 2003
[6] K.Y Han, S.W Lee, J.S Lim, and K.M Sung, ”Channel estimation for OFDM with fast fading channels by modified Kalman filter,” IEEE Transactions on Consumer Electronics, vol. 50, No.2, pp. 443-449, May 2004
[7] J. H. Park, M. Oh, Y. H. Cho, and D. J. Park, “New channel estimation scheme exploiting reliable decision feedback symbols for OFDM systems,” in IEEE Consumer Electronics, International Conference, vol. 7, Jan. 2006, pp. 367-368
[8] M. Chiani, “Introducing Erasure in Decision-feedback Equalization to Reduce Error Propagation,” IEEE Transaction on Communications, vol. 45, No. 7, pp. 757-760, Jul. 1997.
[9] G. Mathew, Y. X. Lee, and V.Y. Krachkovsky, “A novel threshold technique for minimizing error propagation in MDFE read channel,” in IEEE Global Telecommunications Conference, vol. 6, Nov. 1998, pp. 3362 – 3367
[10] M. Reuter, J. C. Allen, R. Zeidler, and C. North, “Mitigating Error Propagation Effects in a Decision Feedback Equalizer,” IEEE Transactions on Communications, vol. 49, No. 11, pp. 2028-2041, Nov. 2001.
[11] C. C. Cheng “Improved Time-Domain Channel Tracking Algorithms for Mobile OFDM Communications” 中央大學碩士論文, Jul. 2007
[12] T. L. Hong “Design of OFDM Transceiver for WLAN in the Time-Varying Channel based on IEEE 802.11a” 中央大學碩士論文, Jul. 2006
[13] COST 207 Digital Land Mobile Radio Communications Luxemburg: Commission of the European Communities, 1989.

指導教授

張大中(Dah-Chung Chang)

審核日期

2008-1-14

推文