多載波分碼多重存取系統(Multi-Carrier Code Division Multiple Access, MC-CDMA)在上鏈傳輸時會因為碼之間的正交性受到頻率選擇性通道(Frequency Selective Fading Channel)破壞受到嚴重的多重存取干擾(Multiple Access Interference, MAI)。一種新型MC-CDMA系統在為了避免MAI藉著在頻域中使用完美高斯整數序列(Perfect Gaussian Integer Sequence, PGIS)而成的展頻碼被提出。然而，多重載波頻率偏移(Carrier Frequency Offset, CFO)也會造成MAI的且依然存在於新型MC-CDMA系統中。在此篇論文中，我們考慮了多重載波頻率偏移的效應。也推導了在此新型MC-CDMA系統中訊號與干擾加雜訊比(Signal to Interference plus Noise Ratio, SINR)。此外，也提出了一種新型連續干擾消除(Successive Interference Cancellation, SIC)方法用來消除因為多重載波頻率偏移而造成的MAI。模擬結果也顯示在使用正交相移鍵控(Quadrature Phase-Shift Keying, QPSK)傳送訊號利用SIC在遞迴四次後在SNR為20 dB時位元錯誤率(Bit Error Rate, BER)可以達到10-3 。特別的是在我們所提出的SIC方法與使用原有MC-CDMA沒有CFO的情況下，在經過四次的遞迴後可以達到相近的BER效能。

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, multiple carrier-frequency offsets also induce MAI, which continues to exist in the novel MC-CDMA system. This thesis considers the effect of multiple carrier-frequency offsets (CFOs). We derive the signals-to-interference-plus-noise ratio of the novel MC-CDMA systems. In addition, a successive interference cancellation (SIC) method is proposed to mitigate MAI caused by multiple CFOs. Simulation experiments demonstrate that the improvements of the proposed SIC method for quadrature phase-shift keying after performing four iterations is 20 dB at a bit-error-rate of 10-3 . Notably, the BER performance of the proposed SIC method after performing four iterations is similar to that of the novel MC-CDMA systems without any carrier-frequency offset.

論文審定書 i
誌謝 ii
中文摘要 iii
Abstract iv
目錄 ⅴ
圖次 vii
第一章 導論 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正交分頻多工系統之基本架構 4
2.2多載波分碼多重存取之基本架構 8
第三章 預編碼正交分頻多工轉換矩陣 11
3.1預編碼矩陣與轉換矩陣 11
3.2使用完美高斯整數序列之轉換矩陣產生方法 12
第四章 多載波分碼多重存取上鏈系統考慮頻率載波偏移 15
4.1系統架構 15
4.2用戶間干擾消除 20
第五章 具有集中的多用戶間干擾與多載波頻率誤差之多載波分碼多工上鏈傳輸系統效能分析 25
5.1 SINR推導與分析 25
第六章 模擬結果與討論 34
第七章 結論 40
參考文獻 41
中英對照表 46
縮寫對照表 52

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