在上鏈傳輸的多載波分碼多重接取 (Multi-Carrier Code Division Multiple Access, MC-CDMA) 系統，訊號會受到頻率選擇性衰減通道 (Frequency-Selective Fading Channel) 影響，導致使用者的展頻碼彼此間失去正交性，產生嚴重的多重接取干擾 (Multiple Access Interference, MAI)。以前有學者提出降低吞吐量可以避免MAI效應的MC-CDMA系統，其中展頻碼及反離散傅立葉轉換矩陣結合而成的轉換矩陣，此矩陣是由稀疏完美高斯整數序列 (Sparse Perfect Gaussian Integer Sequences) 建立而成，這轉換矩陣可以降低傳輸端及接收端的運算複雜度，以及降低峰均功率比 (Peak-to-Average Power Ratio)。本論文使用此系統架構並不降低吞吐量以及解決MAI的問題，我們接收端使用機率概念的干擾消除演算法 (Probability Interference Cancellation, PbIC) 來解決MAI的問題。我們把MC-CDMA系統加入碼簿 (Codebook) 來取代原本調變方式，進而提升此系統效能。我們提供了兩種碼簿設計方式，分別為交錯碼簿及塊狀碼簿，並且提供由位元交織編碼調變 (Bit-Interleaved Coded Modulation, BICM) 及空時編碼 (Space Time Code, STC) 概念為設計準則去判斷碼簿的好壞，且利用低密度奇偶校驗 (Low-Density Parity-Check, LDPC) 碼去展示此系統的極限效能。

Multi-carrier code division multiple access (MC-CDMA) occurs serious multiple access interference (MAI) in uplink transmission with frequency-selective fading channel because the spreading codes lose the orthogonality. A Novel MC-CDMA is proposed in the past study to avoid MAI by properly assigned signal location per user and employing the sparse perfect Gaussian integer sequences (SPGISs) as time-domain spreading codes which are combined with frequency-domain spreading codes and inverse discrete Fourier transform. In this work, we propose the probability based interference cancellation (PbIC) algorithm to mitigate the MAI term when the number of users are full. Moreover, we apply codebook as our modulation to enhance the system performance. We produce two kinds of codebook design and provide two criteria to distinguish between good and bad codebook. We apply the low-density parity-check (LDPC) code as our outer code to demonstrate the system ultimate performance.

論文審定書 i
誌謝 ii
中文摘要 iii
ABSTRACT iv
目錄 v
圖次 vii
表次 ix
第一章 導論 1
1.1 研究動機與貢獻 4
1.2 論文架構 4
第二章 系統模型 5
2.1 正交分頻多工之基本架構 5
2.2 多載波分碼多重接取系統之基本架構 10
第三章 轉換矩陣之設計 12
3.1 展頻碼矩陣和轉換矩陣 12
3.2 使用稀疏完美高斯整數序列建立轉換矩陣之方法 13
第四章 預編碼多載波分碼多重接取上鏈系統使用干擾消除演算法 16
4.1 傳輸端架構 16
4.2 接收端架構 18
4.3 利用機率概念消除用戶之間的干擾演算法 21
4.3.1 分析子載波上的干擾 21
4.3.2 機率概念干擾消除演算法 25
第五章 傳輸端碼簿設計 31
5.1 碼簿設計要點 31
5.2 碼簿設計 32
5.2.1 交錯碼簿 32
5.2.2 塊狀碼簿 32
5.3 判別碼簿好壞的準則 34
5.3.1 使用BICM概念的設計準則 34
5.3.2 使用STC概念的設計準則 36
第六章 預編碼多載波分碼多重接取系統應用碼簿傳輸 40
6.1 MC-CDMA應用碼簿的傳輸端 40
6.1.1 交錯碼簿之編碼調變 40
6.1.2 塊狀碼簿之編碼調變 42
6.2 MC-CDMA應用碼簿的接收端 42
6.3 前人的錯誤修正 44
第七章 模擬結果與討論 45
第八章 結論 52
參考文獻 53
中英對照表 58
縮寫對照表 62

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