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研究生:曾宗揚
研究生(外文):Zong-Yang Zeng
論文名稱:在多路徑衰減通道下之盲蔽適應性通道縮減與頻域等化
論文名稱(外文):Blind Adaptive Channel Shortening and Frequency Domain Equalizations in Multipath Fading Channels
指導教授:翁芳標翁芳標引用關係
指導教授(外文):Fang-Biau Ueng
口試委員:王忠炫鄭立德
口試日期:2011-07-20
學位類別:碩士
校院名稱:國立中興大學
系所名稱:電機工程學系所
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:2011
畢業學年度:99
語文別:英文
論文頁數:57
中文關鍵詞:前置循環碼(CP)符號間干擾(ISI)通道縮減等化器(CSE)正交分頻多工(OFDM)分碼多工存取(CDMA)
外文關鍵詞:Cyclic prefix (CP)Inter-symbol interference (ISI)Channel-Shortening Equalizer (CSE)frequency-division multiplexing (OFDM)Code Division Multiple Access (CDMA)
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前置循環碼(CP)廣泛的被應用在通訊傳輸系統裡面,因為它具有效並且強健的抗符號間干擾的功能。前置循環碼不僅能消除符號間干擾(ISI)也可以拿來和通道縮減等化器(CSE)搭配一起使用。
通道縮減等化器這種技術使用的原理是,假如通道和前置循環碼一樣長的情況下,最後一個前置循環碼減去最後一個重複的符號是因該為零的,因為傳送的符號並沒有受到通道間干擾。遵循這個原理如果其他的前置循環碼和其他重複的符號相減是為零的情況或是等化最小接近零,那麼也代表通道的長度相當於一個長度(one-tap)大小。所以搭配這樣通道縮減等化器的傳送資料,在等化的部分我也只需要用簡單的頻域等化器即可將資料修正回來。
在正交分頻多工(OFDM)和分碼多工存取(CDMA)再無線傳輸的系統裡面是一種熱門的傳輸方式,包括衛星廣播,各種無線區域網路(LAN)標準,以及電視廣播。所以在本篇論文裡面我們也將通道縮減等化器應用在直序列分碼多工存取(DS-CDMA)和正交分頻多工分碼多工存取(OFDM-CDMA)系統上面。

Cyclic prefix (CP) is widely used to communication systems, because it is useful and robust to cancel Inter-symbol interference (ISI). CP this technique it not only can cancel ISI, but also to reduce the channel with the Channel-Shortening Equalizer (CSE).
This technique CSE is using this way that the length of channel is equal with the length of CP the last CP subtract the last symbol will be zero. Follow this way if other CPs with other copy symbols subtraction also zero or minimum to zero, the channel is equal to one tap channel for the transmission data. Using this way demodulate the transmission data, we can use the sample (one tap) frequency-domain equalization to restore it.
And orthogonal frequency-division multiplexing (OFDM) and Code Division Multiple Access (CDMA) is a popular transmission format for emerging wireless communication systems, including satellite radio, various wireless local area network (LAN) standards, and digital broadcast television. So in this paper we also use the CSE in the DS-CDMA and the OFDM-CDMA system.

摘 要 i
Abstract ii
Content iii
LIST OF FIGURES v
TABLE OF LIST vi
Chapter 1 1
Introduction 1
Chapter 2 5
Concepts systems model 5
2.1 Orthogonal Frequency Division Multiplexing (OFDM) 5
2.2 Code Division Multiple Access (CDMA) 10
2.3 OFDM-CDMA 12
2.4 Time-domain based channel shortening approaches 15
2.4.1 Supervised time-domain TEQ designs 15
2.4.2 Blind time-domain TEQ designs 15
2.5 Cyclic Prefix (CP) 17
Chapter 3 20
System model 20
3.1 Concepts transmitter 20
3.2 Channel Model 22
3.3 concepts receiver 23
3.3.2 FEQ before despreading 24
Chapter 4 26
Adaptive blind equalizers algorithms 26
4.1 Adaptive equalization 27
4.2 Blind Equalization 29
4.3 Blind Equalization Algorithms 30
4.3.1 RLS-Multicarrier Equalization by Restoration of RedundancY (MERRY) 31
4.3.2 Constant Modulus Algorithm (CMA) 35
4.3.3 Multimodulus Algorithm (MMA(p,q)) 36
Chapter 5 39
Simulation 39
5.1 Channel-Shortening Equalizer (CSE) 40
5.2 Performance of the MMA p and the CMA 42
5.2.1 FEQ after Despreading 42
5.2.2 FEQ before Despreading 45
5.2.3 Summary the FEQ after Despreading and the FEQ before Despreading 48
Chapter 6 51
Conclusion 51

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