臺灣博碩士論文加值系統

多 載 波 分 碼 多 工 系統(Multi-Carrier Code Division Multiple Access, MC-CDMA)應用在上鏈傳輸中會因為使用者經過頻率選擇性衰落通道(Frequency Selective Fading Channel)而造成展頻碼之間的正交性破壞進而產生多重存取干擾(Multiple Access Interference, MAI)的問題。於是一個新型MC-CDMA利用頻域等效的完美高斯整數序列(Perfect Gaussian Integer Sequences, PGIS)產生展頻碼的特性來避免MAI。然而，其頻率使用效率會因此降低。因此在本篇論文裡，我們將採用連續干擾消除(Successive Interference Cancellation, SIC)的方法去改善頻譜使用效率，並且我們會在此提出訊號對干擾雜訊比(Signal-to-Interference-plus-Noise Ratio, SINR)的推導。在模擬結果中我們可以發現，若在傳送相同的資料下，其配合我們設計的SIC在疊代兩次之後的表現上其錯誤率在10-5的時候和沒有MAI的線好上2dB。

Multi-carrier code division multiple access (MC-CDMA) systems experience serious multiple access interference (MAI) in uplink transmission because the orthogonality among codes is destroyed by the frequency-selective fading channels. A novel MC-CDMA system is proposed to avoid MAI by adopting the frequency-domain equivalents of the perfect Gaussian integer sequences as the spreading codes. However, the spectrum efficiency is decreased. In this thesis, we propose successive interference cancellation (SIC) method to improve the spectrum efficiency. Moreover, we derive the signal-to-interference-plus-noise ratio of the proposed method. Simulation experiments demonstrate that the BER performance of the proposed SIC method with employing the convolution code after performing two iterations for quadrature phase-shift keying is 2 dB better than that of the novel MC-CDMA systems without any MAI at a bit-error-rate of 10-5.

論文審定書 i
誌謝 ii
中文摘要 iii
Abstract iv
目錄 v
圖表 vii
第一章 概論 1
1.1 研究動機 2
1.2 論文架構 3
第二章 系統模型 4
2.1 正交分頻系統之基本架構 4
2.2 多載波分碼多重存取 8
第三章 轉換矩陣設計 11
3.1 展頻碼矩陣與轉換矩陣之關係 11
3.2 使用高斯整數完美序列設計時域的展頻矩陣之產生方法 12
第四章 新多載波分碼多工上鏈系統設計與系統效能 14
4.1 系統架構 14
4.2 連續干擾消除方法 19
第五章 系統效能分析 23
5.1 訊號對干擾加雜訊比分析 23
第六章 模擬結果與討論 30
6.1 MAI與MAI-free的效能比較 30
6.2 提出個別使用者訊號處理架構 31
6.3 加入連續干擾消除方法後的BER表現 32
6.4 錯誤更正碼 34
第七章 結論 37
參考文獻 38
中英對照表 44
縮寫對照表 50

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