臺灣博碩士論文加值系統

在正交分頻多工系統(Orthogonal Frequency Division Multiplexing , OFDM)中有一個的缺點就是峰均功率比值(Peak-To-Average Power ratio, PAPR)過高，在同相位的子載波相加時，所有符元(symbol)功率會互相疊加，這會使正交分頻多工訊號有過高峰均功率比值，目前有很多方法可以降低峰均功率比，本篇論文是採用部分傳輸序列(Partial Transmit Sequence, PTS)做為系統的主架構來降低PAPR。

在本篇論文中，運用以前提過的非互斥子區塊的部分傳輸序列在M-QAM正交分頻多工系統，再結合線性區塊碼作為相位因子，透過引進格雷碼(Gray code)的生長概念，將線性區塊碼採用並列(Parallel)或串列(Series)的方式生長，此方法跟傳統部分傳輸序列相比，有較優的峰均功率比值，且具有較低的運算複雜度。

In this thesis, we propose combination of a modified PTS algorithm by partitioning an OFDM block into non-disjoint OFDM sub-block with linear block codes as phase factors. Through the concept of Gray code, the linear block codes are grown in parallel and serial, compare conventional PTS with our algorithms, our algorithms which are low computational complexity for searching phase factors, and simulation results show that the modified PTS with a non-disjoint partition achieves an obvious improvement of PAPR reduction. In addition, the side information provide extra error-correction property.

Chapter 1 前言 1
Chapter 2 簡介 3
2.1 正交分頻多工系統 3
2.2 峰均功率比值 7
2.3 部分傳輸序列 10
Chapter 3互斥分割與非互斥分割子區塊之部分傳輸序列 12
3.1 相位因子擾動 13
3.2 傳統互斥子區塊資料劃分方式 16
3.3 非互斥分割子區塊部分傳輸序列 (MPTS) 17
3.3.1 MPTS-I 18
3.3.2 MPTS-II 29
3.3.3 MPTS-III 33
Chapter 4 結合非互斥分割子區塊與線性區塊碼模擬結果與討論 37
4.1 運用並列與串列生長BCH碼 37
4.1.1 Parallel in BCH code 40
4.1.2 Series in BCH code 42
4.1.3 計算複雜度分析 44
4.2 模擬結果與討論 45
4.2.1 並列生長模擬圖 46
4.2.2 串列生長模擬圖 52
4.2.3 延伸64-QAM模擬圖 59
Chapter 5 結論 61
參考文獻 62

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