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研究生:溫紹閔
研究生(外文):Shao-Min Wen
論文名稱:一種利用決策回授重疊-切割的頻域等化器
論文名稱(外文):An Overlap-Cut Frequency Domain Equalizer with Decision Feedback
指導教授:李?民
指導教授(外文):Chi-Min Li
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:通訊與導航工程系
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:2008
畢業學年度:96
語文別:中文
論文頁數:67
中文關鍵詞:頻域等化器分碼多工正交分頻多工重疊-切割的頻域等化器
外文關鍵詞:FDECDMAOFDMOC-FDE
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無線通訊系統中,等化器可用來消除多路徑的衰減干擾(Multipath Fading),等化器分為頻域(Frequency Domain)與時域(Time Domain)兩種處理維度,頻域等化器使用上,必須在傳送端加入保護區間(Guard Interval,GI),以避免IBI(Inter Block Interference)的問題,使用保護區間雖然能避免IBI,卻因無法傳輸資訊而浪費頻寬效益。
本論文主要提出一個不需要在傳送端加入保護區間的頻域等化器,可相容於目前通訊系統的資料格式。所提頻域等化器使用Overlap-Cut來消除IBI問題,並利用回授訊號來提升接收效能,由於提出之方法不需在傳送端加入GI,頻寬效益也能進一步改進。
To overcome the effects of multipath fading in the wireless communication systems, equalizer is adopted at the receiver. Equalizers can be classified into two types : one is Frequency Domain Equalizer(FDE) and the other is Time Domain Equalizer(TDE). Transmitter inserts the guard interval (GI) to avoid inter-block interference (IBI) for the FDE receiver. However, system capacity will be reduced for the insertion of the GI.
In this paper, we propose a FDE without GI, i.e., Overlap-Cut(OC) FDE with decision feedback. The proposed FDE adopts the OC method to avoid the IBI and exploits the decision feedback to improve the BER performance. Without inserting the GI, the proposed FDE is more compatible to frame structure of the existing communication systems.
第一章 導論...............................................1
1.1簡介..................................................1
1.2論文大綱...............................................2
第二章 等化器文獻回顧.......................................4
2.1時域等化器..............................................4
2.1.1 MMSE (Minimum Mean Square Error)....................5
2.1.2 CG (Conjugate Gradient).............................5
2.1.3 LMS(Least Mean Square)..............................6
2.2 頻域等化器.............................................7
2.2.1 ZF-FDE and MMSE-FDE.................................8
2.2.2 MMSE Overlap-Cut FDE...............................10
2.2.3 SCBT- FDE..........................................11
第三章OC-FDE 與 OC-FDE with Decision Feedback.............15
3.1 OC-FDE...............................................15
3.2 OC-FDE with Decision Feedback........................19
第四章 利用OC-FDE with Decision Feedback 於CDMA與OFDM系統...21
4.1WCDMA(Wideband Code Division Multiple Access) 系統簡介..21
4.1.1 利用OC- FDE with Decision Feedback 於WCDMA下鏈系統...24
4.1.2加入PIC 於OC-FDE with Decision Feedback WCDMA下鏈系統
...................................................27
4.2 OFDM(Orthogonal Frequency Division Multiplexing)系統簡介
..................................................... 30
4.2.1 利用OC-FDE with Decision Feedback於OFDM系統.........31
4.3 P長度分析.............................................35
第五章 複雜度分析與位元錯誤效能模擬...........................38
5.1運算複雜度分析..........................................38
5.2 WCDMA下鏈系統效能分析..................................40
5.2.1頻域等化器效能之比較...................................41
5.2.2時域等化器與頻域等化器性能之比較.........................44
5.2.3實測通道模擬結果.......................................45
5.3OFDM環境效能分析........................................48
5.3.1頻域等化器效能模擬.....................................48
5.3.2實測通道模擬結果.......................................49
5.3.3 OC-FDE P長度與效能分析模擬.. .........................51
第六章 結論與未來工作 ......................................53
參考文獻 .................................................54
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