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 Multicarrier communication has been employed for wire-line communications and has been adapted for use in the future wireless local area network. The term multicarrier modulation includes a number of transmission schemes whose main characteristic is the decomposition of any wideband channel into a set of independent narrowband channels. With this family, the most commonly used schemes are Orthogonal Frequency Division Multiplexing (OFDM) and OFDM-CDMA (Code Division Multiple access), which are based on the Discrete Fourier Transform, resulting in an implementable, high performance structure. Due to its robustness against multipath fading with certain implementation advantage over single-carrier system, coded OFDM has become a popular technique in various high-speed wireless data transmission system. One of the main implementation disadvantages of OFDM and OFDM-CDMA is the high peak-to-average power ratio (PAPR) of the transmitted signals. In this paper, we proposed a technique that combines block code modulation (BCM) with Golay complementary sequence to reduce the peak to average power ratio (PAPR) in OFDM system. And we proposed a reduced algorithm to find optimum Walsh-Hadamard code sets which can maintain almost the minimum peak to average power ratio in OFDM-CDMA system.
 致謝 i 中文摘要 ii 英文摘要 iii 目錄 iv 圖目錄 vii 表目錄 x 前言 xi 第一章 OFDM系統與OFDM-CDMA系統介紹 1 1.1 OFDM系統介紹 1 1.2 OFDM系統的起源 3 1.3 CDMA系統介紹 4 1.3.1 單一式CDMA 5 1.3.2 混合式CDMA 6 1.4 OFDM-CDMA系統介紹 6 第二章 OFDM系統和OFDM-CDMA下行傳輸系統架構 9 2.1 正交轉換 9 2.1.1 快速傅利葉轉換 11 2.2 OFDM訊號數學表示式 15 2.3 保護時間和循環擴張 18 2.3.1 保護區間 19 2.3.2 循環擴張 19 2.4 OFDM-CDMA下行傳輸系統 21 2.4.1 展頻碼 22 2.4.2 交錯器 25 第三章 峰值功率對平均功率比值 28 3.1 區塊碼 30 3.2 格雷互補對與格雷互補序列 32 3.3 布林函數 34 3.4 布林多項式 36 3.5 里得-米勒碼 37 3.6 里得-米勒碼建構格雷互補對集合 39 第四章 QPSK序列與16QAM序列 42 4.1 BPSK、QPSK、QAM調變方式介紹 42 4.2 QPSK群集興16QAM群集 45 4.3 QPSK序列與BPSK序列 46 第五章 區塊編碼調變 48 5.1 分配劃分 49 5.2 結合調變區塊碼 51 5.3 最小平方歐幾里得距離 53 第六章 OFDM-BCM與OFDM-CDMA改善高PAPR方法 54 6.1 運用區塊編碼調變方式來降低OFDM系統 高PAPR的特性 54 6.2 運用選取展頻碼來降低OFDM-CDMA系統高 PAPR特性 72 第七章 結論與總結 80 參考文獻 81
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 1 OFDM-CDMA於行動通訊系統之效能分析 2 以格雷序列與非格雷序列降低OFDM訊號之峰均比 3 以訊號扭曲法改善正交分頻多工訊號之非線性容忍度 4 線性相位變化降低正交分頻多工訊號功率峰均比 5 以垂直正交分頻分碼多工調變為基礎之下鏈接收機架構之設計 6 以PTS為基礎之OFDM系統中具低複雜度IFFT架構之FPGA實現 7 正交分頻多工系統之低計算複雜度峰值對平均功率比值降低技術之研究 8 應用峰值削弱及線性組合降低峰均功率比 9 降低峰均功率比之IFFT中間級數相位序列選擇演算法研究 10 結合降低峰均功率比技術與多項式預扭器技術之效能分析 11 正交分頻多工群播系統下具降低功率峰均值之噴泉碼 12 正交分頻多工系統之功率峰均值改善分析 13 使用空間-頻域區塊編碼之MIMO-OFDM系統的低複雜度功率峰均比降低技術 14 使用修正型有效星座圖擴展技術降低正交分頻多工系統之峰均功率比值 15 正交分頻多工系統中高效次通道降峰值法

 1 1.王栢村，1999，「陸地車輛動態行駛品質分析」，永達學報，第一卷，第一期，第1~22頁。

 1 應用於數位廣播系統之編碼正交分頻多工傳輸技術及基於渦輪等化之編碼正交分頻多工/分碼多重存取傳輸技術之比較 2 多重輸出入正交分頻多工系統之通道容量研究 3 結合預先編碼與非線性壓縮擴展方式降低OFDM系統峰均值功率比之研究 4 改良型選擇性映射技術降低正交分頻多工系統之峰值對平均功率比 5 在正交分頻多工系統上透過組合法降低峰值對均值功率比與帶外功率散逸之研究 6 具週期性前導序列之正交分頻多工/正交分頻多工存取系統中最大似然載波頻率偏移估計 7 具有錯誤更正能力且降低峰均功率比值之多載波通訊系統 8 MC-CDMA之展頻碼選擇方法研究 9 5.2GHz無線區域網路CMOS低雜訊放大器之設計 10 正交分頻多工系統之最大可能性估測技術研究 11 在正交分頻多工系統中結合降低尖峰平均功率比與錯誤更正碼之研究 12 在多輸入多輸出正交分頻多工調變含有虛載波系統下快速收斂之半盲目通道估測的研究 13 么正矩陣轉換降低OFDM峰均值功率比的方法經無線通道後錯誤率效能研究 14 利用通道編碼解決正交分頻多工系統下盲式資料估測器的模糊性 15 在頻率複用的正交分頻多工存取網路中使用動態載波分配的研究

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