# 臺灣博碩士論文加值系統

(44.201.94.236) 您好！臺灣時間：2023/03/24 11:21

:::

### 詳目顯示

:

• 被引用:0
• 點閱:202
• 評分:
• 下載:8
• 書目收藏:0
 在本篇論文中，探討正交分频分多工（Orthogonal Frequency-Division Multiplexing,OFDM）系统中，利用臨界值結合Regularized Least-Squares估計法進行稀疏通道估計處理。Regularized Least-Squares估計法利用通道係數的時域相關性，使用已知pilot資訊以及最新通道估計結果來更新通道。再進一步，考慮多重路徑通道係數所具有的稀疏特性，可以利用臨界值判斷處理來取得非零值通道係數，以進一步提升Regularized Least-Squares估計法的效能。最後模擬結果顯示，與傳統的最小平方法相比，臨界值結合Regularized Least-Squares估計法，在稀疏通道估測上可以有更低的均方誤差及更好的估計性能。
 In this thesis,we combine thresholding with the Regularized Least- Squares method to estimate sparse channels in Orthogonal Frequency-Division Multiplexing systems.The Regularized Least-Squares method is based on temporal channel correlation,and this method uses recieved pilot symbol and latest channel information to update channels.Considering the sparse nature of multipath channels,the threshold can be used to get significant taps,and further improve the performance of the Regularized Least-Squares method.Simulation results show that compared to the Least Squares method channel estimation,the threshold combined with the Regularized Least-Squares method to estimate sparse channels can reduce the mean square error and better estimate performance.
 第一章 簡介 1第二章 正交分頻多工系統之基本原理與架構 32.1 OFDM 架構演進 32.2 OFDM 系統架構 42.3 調變(Modulation) 52.4 OFDM 正交特性(Orthogonal Property) 62.5 循環字首(Cyclic Prefix, CP) 72.6 pilot訊號排列 8第三章 OFDM系統模型 113.1通道模型 113.2 系統模型 12第四章 通道估測技術 144.1 最小平方法(Least Square Method，LS) 144.2 Regularized Least-Squres Method 15第五章 估計稀疏通道演算法 205.1 Threshold-based modified Least Squres(TmLS)Method 205.2 臨界值結合Regularized LS估計法 24第六章 分析模擬結果 25第七章 結論 34參考文獻 35
 [1]Van de Beek, J.J., Edfors, O., Sandell, M., Wilson, S.K., and Borjesson,P.O. “On channel estimation in OFDM systems”. Proc. IEEE VTC,Chicago, IL, USA, 1995, Vol. 2, pp. 815–819[2]Kuo-Guan Wu and Min-Kuan C. Chang “Adaptively Regularized LeastSquares Estimator for Decision-Directed Channel Estimation in TransmitDiversity OFDM Systems”, IEEE Wireless Communications Letters, vol. 3,no. 3, June 2014, pp.309-312.[3]Ali H. Sayed, Adaptive Filters, NJ: Wiley, 2008.[4] J. Oliver, R. Aravind, and K. M. M. Prabhu, “Sparse channel estimation inOFDM systems by threshold-based pruning,” Electron. Lett., vol. 44, no. 13,pp. 830–832, June 2008[5] Liu Kewen, XingKe, “Research of MMSE and LS channel estimation inOFDM systems”, IEEE 2nd International Conference on Information Science and Engineering, Dec. 2010[6]Edfors, O., Sandell, M., van de Beek, J.-J., Wilson, S.K., and Borjesson,P.O.“Analysis of DFT-based channel estimators for OFDM”, Wirel. Pers.Commun., 2000, 12, (1), pp. 55– 70[7]D. N. C. Tse and P. Viswanath , “Fundamentals of WirelessCommunications. ” Cambridge, U.K.: Cambridge Univ. Press, 2005[8]J. Oliver, R. Aravind, and K. M. M. Prabhu, “Improved least squareschannel estimation for orthogonal frequency division multiplexing, ” IETSignal Processing, vol. 6, no. 1, pp. 45–53, 2012.[9]Y. Kang, K. Kim, and H. Park, “Efficient DFT-based channel estimation forOFDM systems on multipath channels,” IET Commun., vol. 1, no. 2, pp. 197–202, 2007.[10]Raghavendra, M.R., and Giridhar, K.: “Improving channel estimation inOFDM systems for sparse multipath channels”, IEEE Signal Process .Lett., 2005, 12, (1), pp. 52–55[11] H. Minn et al. “A reduced complexity channel estimation for OFDMsystems with transmit diversity in mobile wireless channels,” IEEE Trans.Commun., vol. 50, no. 5, pp. 799–807, May 2002.[12] Kuo-Guan Wu and Jer-An Wu, “Efficient Decision-Directed ChannelEstimation for OFDM Systems with Transmit Diversity”, IEEE Communications Letters, vol. 15, no. 7, July 2011, pp.740-742.
 電子全文
 國圖紙本論文
 推文當script無法執行時可按︰推文 網路書籤當script無法執行時可按︰網路書籤 推薦當script無法執行時可按︰推薦 評分當script無法執行時可按︰評分 引用網址當script無法執行時可按︰引用網址 轉寄當script無法執行時可按︰轉寄

 1 在OFDM系統中基於LS演算法通道估測之分析與研究 2 多輸入多輸出正交分頻多工系統之量測與通道估測

 無相關期刊

 1 運用Regularized LS 估計法於OFDM系統的通道估測處理之效能分析 2 於正交分頻多工無線傳輸系統中之效能改良通道估計法 3 四相8/6極切換式磁阻馬達自感與互感的分析與驗證 4 電暈處理對氮化鎵系列高電子遷移率電晶體特性影響之研究 5 氧化鋅摻鈦與氟薄膜的製備與特性研究 6 高效率單輸出與雙輸出切換電容式直流降壓器設計及實作 7 在D2D 環境下傳輸資源分配的研究:用賽局理論 8 多目標合作連續蟻群最佳化之模糊控制器及機器人導航應用 9 八位元每秒二十六億次時序交錯連續逼近暫存式類比數位轉換器之校正 10 適用於多輸入多輸出正交分頻多工系統之參數化分解預編碼回傳系統之設計與實現 11 陸客來臺旅遊之網路口碑研究 12 六軸微定位平台性能分析 13 CNC工具機PES加工應用專家系統之開發與研究 14 表現嗜鹽甲烷太古生物Methanohalophilus portucalensis FDF1T甜菜鹼生合成基因Mpgsmt或Mpsdmt對水稻(Oryza sativa L.)葉片滲透調節能力之影響 15 以乾旱指標探討火燒潛勢區位特性之研究

 簡易查詢 | 進階查詢 | 熱門排行 | 我的研究室