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研究生:楊智安
研究生(外文):Chi-an Young
論文名稱:嶄新的一階頻域RLS等化器結合通道資訊輔助Viterbi解碼器應用於OFDM系統中
論文名稱(外文):A Novel One-Tap Frequency Domain RLS Equalizer Combined with Viterbi Decoder Using Channel State Information in OFDM Systems
指導教授:高永安高永安引用關係
指導教授(外文):Yung-an Kao
學位類別:碩士
校院名稱:長庚大學
系所名稱:電機工程研究所
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:2006
畢業學年度:94
語文別:中文
論文頁數:72
中文關鍵詞:正交分頻多工遞迴最小平方演算法通道資訊
外文關鍵詞:OFDMRLSCSIchannel state information
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在本篇論文中,我們設計一套嶄新的一階頻域遞迴最小平方(RLS)等化器,將其應用於正交分頻多工系統中。此一新的演算法可避免除法運算,和傳統的一階頻域最小均方差(LMS)及一階頻域遞迴最小平方(RLS)等化器之演算法比較起來,本論文提出之演算法在硬體的實現上更為容易。
除了新的演算法設計,在此等化器的架構下,我們可以導入等化器提供之通道資訊來輔助Viterbi解碼器,進而提升整體系統的效能。並以IEEE 802.11a規格為例,來進行系統模擬,分析其效能。
In this thesis, we design a novel one-tap frequency domain RLS equalizer in OFDM systems. Compare with conventional one-tap frequency domain LMS and RLS equalizer, the division operation is not needed in the proposed algorithm, which has advantage for hardware implementation.
In addition, channel state information (CSI) can be obtained from the equalizer structure to aid Viterbi decoder that improves the whole system performance. Finally, we take IEEE 802.11a standard as an example to analyze the system performance that is based on the proposed method.
第一章 序論 1
1.1 研究背景 1
1.2 研究動機及目的 2
1.3 本篇論文架構 4
第二章 OFDM技術簡介 5
2.1 多載波傳輸架構[5][6] 5
2.2 OFDM系統架構[5][6] 7
2.3 OFDM系統接收端之問題[5][6] 10
2.3.1 載波頻率偏移 10
2.3.2 取樣頻率偏移 12
2.3.3 OFDM信號考慮CFO及SFO之數學模型[14] 14
2.4 等化 16
2.5 OFDM內部接收機架構簡介 17
2.6 總結 20
第三章 嶄新的一階頻域RLS等化器 21
3.1 一階頻域LMS及RLS等化器簡介 21
3.1.1 一階頻域LMS等化器[24][25] 21
3.1.2 一階頻域RLS等化器 23
3.2 嶄新的一階頻域RLS等化器 25
3.3 訊號空間圖比例之調整 28
3.4 總結 31
第四章 利用通道資訊輔助Viterbi解碼器 33
4.1 通道資訊簡介 33
4.2 通道資訊輔助Viterbi解碼之方式 34
4.3 利用嶄新的一階頻域RLS等化器提供之通道資訊輔助Viterbi解碼器 36
第五章 嶄新的一階頻域RLS等化器結合通道資訊於OFDM系統中之效能分析 41
5.1 IEEE802.11a系統規格簡介 41
5.1.1 IEEE 802.11a系統參數特色 41
5.1.2 頻率偏移的計算 44
5.2 模擬環境及參數設定 45
5.3 未考量通道資訊之OFDM系統效能 46
5.3.1 傳統之等化方式 47
5.3.2 傳統等化方式之系統效能 49
5.4 考量通道資訊之OFDM系統效能 51
5.4.1 傳統等化方式考量通道資訊之系統效能 51
5.4.2 嶄新的一階頻域RLS等化器加入通道資訊之系統效能 52
第六章 結論及未來展望 56
參考文獻 57
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