臺灣博碩士論文加值系統

資料在傳送過程中很容易受多重路徑效應及符元干擾(ISI)的影響，
造成嚴重的訊號衰減。
因此本論文引入小波基底多載波多重進接系統和小波域遞迴最小平方(RLS)演算法來改良整體通訊品質。
小波基底有絕佳的正交性，
它可以輕易地做到位移與伸縮，
比傳統的傅利葉基底有更好的效能。
多載波多重進接可以有效的去除多重路徑效應和符元干擾，
還可以大幅地提高資料的傳輸率,更可以藉著給每一個使用者一個獨特的使用者碼,
讓更多使用者來使用。
快速小波域RLS比一般時域的RLS有較快的收斂速度和較佳的收斂結果，
所以有效的降低位元錯誤率，使得通訊的品質達到更好。

During the processing of transmitting information,
the multipath effect and intersymbol interference (ISI)
are unavoidable.Therefore,this thesis adopt the wavelet-based multi-carrier code division multiple access (MC-CDMA) system
and fast wavelet transform recursive least square (FWTRLS) algorithm to improve the communication quality. Besides the better orthogonality, wavelet can scale and translate easily.
Therefore, in many cases, the wavelet transform performs better than the Fourier transform. MC-CDMA could eliminate not only multipath effect but ISI and promote the data rate.
FWTRLS has much faster convergence rate and better convergencing results than normal time domain ones. We could apply FWTRLS algorithm in wavelet-based MC-CDMA to
reduce the bit error rate and make the communication quality perfect.

第一章 序論............................................1
1.1 背景簡介.......................................1
1.2 研究動機與研究目的.............................3
1.3 各章節內容概述.................................3
第二章 小波轉換概論.....................................5
2.1 小波轉換簡介...................................5
2.2 比例函數的介紹.................................6
2.2.1 比例函數.......................................6
2.2.2 比例函數的產生.................................8
2.3 由多解析空間來看小波函數.......................9
2.4 多解析轉換.....................................11
2.4.1 拆解分析.......................................12
2.4.2 合成分析.......................................13
2.5 濾波器程式庫...................................14
第三章 正交分頻多工調變.................................18
3.1 OFDM系統簡介...................................18
3.2 使用快速傅立葉轉換調變和解調變.................19
3.3 結合OFDM和CDMA系統.............................21
3.4 直序展頻CDMA簡介...............................22
3.5 MC-CDMA簡介....................................22
3.6 MC-DS-CDMA簡介.................................23
3.7 小波基底MC-CDMA簡介............................23
3.8 多使用者的情況.................................25
第四章 小波域可適性演算法.............................33
4.1 前言...........................................33
4.2 傳統的小波域LMS簡介............................34
4.3 移除重複部分...................................36
4.4 FWTLMS演算法...................................39
4.5 FWTRLS演算法...................................40
4.6 模擬結果與分析.................................43
4.6.1 小波基底與傅立業基底的比較.....................43
4.6.2 小波基底MC-CDMA下改變使用者數目................45
4.6.3 快速小波域演算法...............................47
4.6.4 小波基底MC-CDMA結合快速小波域演算法............48
第五章 結論與未來發展.................................54
5.1 結論...........................................54
5.2 未來發展.......................................55
參考文獻................................................56

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