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研究生:楊如沁
研究生(外文):Ju-Chin Yang
論文名稱:半盲式通道估測法應用於多輸入多輸出正交分頻多工系統之效能改進
論文名稱(外文):Performance Improvement of Semi-Blind Channel Estimation in MIMO-OFDM Systems
指導教授:曾德樟
指導教授(外文):Der-Chang Tseng
口試委員:譚旦旭陸清達
口試日期:2012-07-20
學位類別:碩士
校院名稱:國立臺北科技大學
系所名稱:電腦與通訊研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:68
中文關鍵詞:多輸入多輸出正交分頻多工半盲式通道估測Generalized chirp-like
外文關鍵詞:MIMOOFDMSemi-blind channel estimationGeneralized chirp-like
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本論文主要探討在多路徑緩慢衰落通道下,半盲式通道估測法應用於多輸入多輸出正交分頻多工(MIMO-OFDM)系統上的效能改善。有別於傳統利用領航訊號的通道估測方法,造成領航訊號佔用傳輸頻寬的缺點,半盲式通道估測法效能雖不如傳統利用領航訊號的通道估測效能來得好,但是卻能節省傳輸領航訊號的頻寬及增加資料傳輸效率。
本文提出一改良之半盲式通道估測法,利用疊加Generalized chirp-like (GCL)序列降低對資料的干擾,接著使用最小平方(Least Square, LS)法估測通道頻率響應的初值,再利用偵測機制找出較正確之通道響應,以增加估測之準確性,並藉由反覆估測再偵測的步驟,達到最佳的估測效果。由實驗結果顯示,本文提出的改良半盲式通道估測法效能優於現有的半盲式通道估測法。


In this thesis we mainly study the performance improvement of semi-blind channel estimation in MIMO-OFDM systems under the slow Rayleigh fading channel. Generally, the performance of the pilot-aided channel estimation method is better than
that of the semi-blind channel estimation method. However, the semi-blind channel estimation method can effectively save the transmission bandwidth due to not using the pilot symbols in transmission data. A new semi-blind channel estimation method is proposed in this thesis. First, the
interference to the data signal is reduced by using the superimposed generalized chirp-like (GCL) sequence. Then we use the least square (LS) method to estimate the initial value of the channel frequency response. Based on the previous step, the correct channel frequency response is obtained by repeatedly doing the estimation and the detection steps, which can effectively reduce the effect of noise and increase the accuracy of channel estimation. Experimental results show that considerably improved performance can be achieved in terms of bit error rate (BER), compared with the conventional semi-blind channel estimation method.

摘 要 i
ABSTRACT ii
誌謝 iv
目錄 v
圖目錄 vii
表目錄 ix
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 2
1.3 各章節內容摘要 2
第二章 正交分頻多工系統介紹 3
2.1 簡介 3
2.1.1 基本原理 3
2.1.2系統架構 6
2.1.3 OFDM之優缺點 7
2.2 多輸入多輸出系統 9
2.2.1 MISO空時區塊碼架構 12
2.2.2 MIMO空時區塊碼架構 15
2.3 MIMO-OFDM系統架構 18
2.4 通道模型 20
第三章 半盲式通道估測法 23
3.1 通道估測之介紹 23
3.2 Generalized chirp-like (GCL)序列 24
3.2.1 GCL序列之row序列分析 25
3.2.2 GCL序列之column序列分析 29
3.3 常用的通道估測演算法 30
3.3.1 最小平方(LS)演算法 30
3.3.2 最小均方(LMS)演算法 31
3.3.3 遞迴式最小平方(RLS)演算法 35
3.4半盲式通道估測 37
3.4.1 半盲式通道估測系統架構 38
3.4.2 Li’s method 39
3.4.3 半盲式通道估測效能之改善 41
第四章 模擬結果與討論 44
4.1 通道參數與系統參數之設定 44
4.2不同估測法在2I2O-OFDM系統之性能比較(實驗通道) 47
4.3不同估測法在2I2O-OFDM系統之性能比較(4 RA) 53
4.4不同估測法在2I2O-OFDM系統之性能比較(6 TU) 59
第五章 結論與未來展望 65
參考文獻 66


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