臺灣博碩士論文加值系統

部分傳輸序列(Partial Transmit Sequence, PTS)為一種用於降低正交分頻多工(Orthogonal frequency-division multiplexing, OFDM)之均峰功率比值(Peak to Average Power, PAPR)的技術，然而隨著OFDM訊號的子載波數量增加，以及PTS劃分區塊數量提升，則使得計算複雜度呈指數上升。本論文提出一種改良型的具門檻值選擇機制之部分傳輸序列(Threshold Selection PTS, TS-PTS)，主要有兩點貢獻：首先，修正了具門檻值選擇機制的部分傳輸序列的相位因子限制，採用其他類型組合的相位因子進行實驗，模擬結果顯示我們採用五種不同組合的相位因子皆優於原本的方法，另一方面，將門檻值引入自我調整機制，根據每一次的PAPR值動態調整門檻值。

Partial Transmit Sequence (PTS) is a technology used to reduce the Peak to Average Power (PAPR) of Orthogonal Frequency-Division Multiplexing (OFDM). The computational complexity increases when the number of sub-carriers of the OFDM signal increases or the number of PTS blocks increases. This paper proposes an improved Threshold Selection PTS, which has two main contributions: first, this paper adjusts the phase factor in the PTS with the threshold selection mechanism, this paper use other combinations of phase factors for our simulation. On the other hand, the threshold value is introduced into the self-adjusting mechanism. The threshold is dynamically adjusted according to the PAPR value each time. The simulation results show that the method proposed in this paper has better performance than the traditional PTS.

目錄
第一章、諸論............................................................................................................................ 1
1.1 研究動機.................................................................................................................... 1
1.2 論文架構.................................................................................................................... 3
第二章、正交分頻多工系統.................................................................................................... 4
2.1 正交分頻多工............................................................................................................ 5
2.2 正交分頻多工系統流程介紹.................................................................................... 6
2.3 調變技術.................................................................................................................... 8
2.4 快速傅立葉變換........................................................................................................ 9
2.5 均峰功率比值與互補累積分布函數...................................................................... 15
第三章、部分傳輸序列技術.................................................................................................. 17
3.1 劃分方式.................................................................................................................. 19
3.2 產生相位因子.......................................................................................................... 21
3.3 相位擾亂.................................................................................................................. 22
第四章、具門檻值機制之部分傳輸序列.............................................................................. 23
4.1 新型相位擾亂.......................................................................................................... 25
4.2 門檻值...................................................................................................................... 26
4.3 篩選機制.................................................................................................................. 27
第五章、研究方法.................................................................................................................. 28
5.1 相位因子規則.......................................................................................................... 32
5.2 新型相位產生.......................................................................................................... 33
5.3 產生兩群候選訊號.................................................................................................. 34
5.4 候選訊號合成.......................................................................................................... 34
5.5 門檻值選擇機制...................................................................................................... 35
第六章、模擬結果.................................................................................................................. 37
6.1 鄰近劃分之模擬分析.............................................................................................. 39
6.2 隨機劃分之模擬分析.............................................................................................. 42
6.3 交錯劃分之模擬分析.............................................................................................. 45
6.4 三種劃分方式之模擬分析...................................................................................... 49
6.5 搜尋量分析.............................................................................................................. 52
第七章、結論.......................................................................................................................... 61
參考文獻.................................................................................................................................. 62

表目錄
表 1 相位因子規則.................................................................................................. 33
表 2 實驗模擬在隨機劃分的參數設定.................................................................. 38
表 3 鄰近劃分均峰功率比值對照表...................................................................... 42
表 4 隨機劃分均峰功率比值對照表...................................................................... 45
表 5 交錯劃分均峰功率比值對照表...................................................................... 48
表 6 子載波數量為 256 時之搜尋量分析表.......................................................... 52
表 7 子載波數量為 512 時之搜尋量分析表.......................................................... 52
表 8 子載波數量為 1024 時之搜尋量分析表........................................................ 53
表 9 子載波數量為 2048 時之搜尋量分析表........................................................ 53
表 10 子載波數量為 256 時之搜尋量分析表........................................................ 55
表 11 子載波數量為 512 時之搜尋量分析表 ........................................................ 55
表 12 子載波數量為 1024 時之搜尋量分析表...................................................... 56
表 13 子載波數量為 2048 時之搜尋量分析表...................................................... 56
表 14 子載波數量為 256 時之搜尋量分析表........................................................ 58
表 15 子載波數量為 512 時之搜尋量分析表........................................................ 58
表 16 子載波數量為 1024 時之搜尋量分析表...................................................... 59
表 17 子載波數量為 2048 時之搜尋量分析表...................................................... 59

圖目錄
圖 1.分頻多工示意圖................................................................................... 5
圖 2. 正交分頻多工示意圖.......................................................................... 5
圖 3. 正交分頻多工系統流程圖.................................................................. 6
圖 4. QPSK 的相位星座圖........................................................................... 8
圖 5. 正交分頻多工示意圖........................................................................ 15
圖 6. 正交分頻多工訊號互補累積分布函數示意圖................................ 16
圖 7. 部分傳輸序列系統方塊圖................................................................ 18
圖 8. 具有 16 筆訊號的資料...................................................................... 19
圖 9. 鄰近劃分............................................................................................ 19
圖 10. 隨機劃分.......................................................................................... 20
圖 11. 交錯劃分.......................................................................................... 20
圖 12. 具門檻值機制之部分傳輸序列...................................................... 24
圖 13. 子載波為 256 時的門檻值曲線圖.................................................. 26
圖 14. 門檻值篩選機制.............................................................................. 27
圖 15. M-TS-PTS 系統方塊圖 ................................................................... 29
圖 16. 門檻值選擇機制流程圖................................................................. 36
圖 17. 子載波數量為 256 時之鄰近劃分效能分析圖............................. 39
圖 18. 子載波數量為 512 時之鄰近劃分效能分析圖............................. 39
圖 19. 子載波數量為 1024 時之鄰近劃分效能分析圖........................... 40
圖 20. 子載波數量為 2048 時之鄰近劃分效能分析圖........................... 40
圖 21. 子載波數量為 256 時之隨機劃分效能分析圖............................. 42
圖 22. 子載波數量為 512 時之隨機劃分效能分析圖............................. 43
圖 23. 子載波數量為 1024 時之隨機劃分效能分析圖........................... 43
圖 24. 子載波數量為 2048 時之隨機劃分分析圖................................... 44
圖 25. 子載波數量為 256 時之交錯劃分效能分析圖............................. 45
圖 26. 子載波數量為 512 時之交錯劃分效能分析圖............................. 46
圖 27. 子載波數量為 1024 時之交錯劃分效能分析圖........................... 46
圖 28. 子載波數量為 2048 時之交錯劃分效能分析圖........................... 47
圖 29. 子載波數量為 256 時之三種劃分方式效能分析圖..................... 49
圖 30. 子載波數量為 512 時之三種劃分方式效能分析圖..................... 49
圖 31. 子載波數量為 1024 時之三種劃分方式效能分析圖................... 50
圖 32. 子載波數量為 2048 時之三種劃分方式效能分析圖................... 50

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