本論文主要在探討正交分頻多重接取(OFDMA)系統與使用完全互補碼(complete complementary code)的多載波分碼多工系統兩者的性能比較。
第三代行動通訊的主要技術為CDMA，而使用完全互補碼為展頻碼的CDMA又比傳統的CDMA擁有更多優點。由數個正交矩陣而產生的完全互補碼，是由數個自互補碼組所構成，而自互補碼組之間彼此為互互補碼的關係。而完全互補碼最大的特點在於碼組之間擁有完美的相關性。再者，由於我們所用的展頻碼為完全互補碼，其自相關函數及互相關函數是完美的，即使每個bit都與其它的bit重疊，然而bit之間並不會相互干擾，而用戶與用戶之間也沒有相互干擾的問題存在。
OFDMA已成為第四代行動通訊的核心。因為使用正交載波來傳遞訊，所以用戶和用戶間也沒有相互干擾的問題，但必需對同步更加精準。OFDMA能提供比第三代系統更佳的移動性，因此在本論文中將對這兩個系統做一比較，藉由我們的分析讓我們更能了解在第四代系統使用OFDMA的優點為何。

In this thesis, the performance comparison of orthogonal frequency division multiple access (OFDMA) and complete complementary code based CDMA system is studied.
The complete complementary code is composed of several sets of auto-complementary codes, any two of which are cross-complementary codes. The perfect correlation between code sets is the distinguishing feature of complete complementary code.
OFDMA is used in the 4th. generation Mobile Communication systems. The OFDMA architecture can offer an MAI-free operation in both down-link (synchronous channel) and up-link (asynchronous channel) transmission under the AWGN channel.

中文摘要I
AbstractIII
誌謝V
目錄VII
變數列表IX
圖目錄XI
表目錄XIII
第一章 導論1
1.1 研究動機1
1.2 論文架構3
1.3 參考文獻4
第二章 正交分頻多重接取系統(OFDMA)7
2.1 前言7
2.2 正交分頻多工系統(OFDM)7
2.2.1 OFDM背景與發展現況7
2.2.2 OFDM系統架構 8
2.1.3 載波正交性證明12
2.1.4 OFDM發射信號頻寬14
2.1.5 循環前置(Cyclic Prefix)15
2.1.6 系統模型與分析17
2.1.7 峰值功率對平均功率比值(PAPR)20
2.3 正交分頻多重接取(OFDMA)21
2.4 無線傳輸通道25
2.4.1 通道模型26
2.4.2 通道估測29
2.4.3 無線衰減通道的改善方法30
2.4.3.1 對抗信號失真30
2.4.3.2 改善功率訊雜比(SNR)的耗損31
2.5 參考文獻32
第三章 OFDMA調(Tone)分配與系統容量35
3.1 前言35
3.2 調分配35
3.3 IEEE 802.16e OFDMA 下行系統規格36
3.4 系統容量39
3.5 參考文獻41
第四章 正交分頻多重擷取與互補碼分碼多工系統之性能比較43
4.1 前言43
4.2 互補碼分碼多工系統43
4.2.1 正交完全互補碼43
4.2.2 正交完全互補碼(Orthogonal complete complementary code)性質44
4.2.3 正交完全互補碼產生方法47
4.2.4 系統傳送端架構50
4.2.5 系統接收端架構53
4.2.6 錯誤率分析58
4.3 正交分頻多重擷取系統性能分析60
4.3.1 單一用戶分析60
4.3.2 多用戶分析68
4.4 Matlab結果比較72
4.5 參考文獻74
第五章 結論與建議75
附錄A：討論OFDM訊號在傳送端為何取實部77
A.1 理論分析77
A.2 參考文獻83

Chapter 1
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