選擇性映射(Selected Mapping, SLM)技術已被廣泛運用在正交分頻多工(Orthogonal Frequency Division Multiplexing, OFDM)系統用來降低峰值功率對平均功率比(Peak-to-Average Power Ratio, PAPR)。雖然SLM方法可有效地降低PAPR，但須要額外傳送旁帶訊息(Side Information, SI)至接收端，進而降低了系統傳輸效率。本論文中，我們提出兩種運用在空頻區塊碼(Space-Frequency Block Coding, SFBC)之多輸入多輸出(Multiple-Input Multiple-Output, MIMO) OFDM系統中降低系統PAPR的方法。第一個方法是在頻域上產生候選訊號而第二個方法則在時域上產生候選訊號。本論文所提出的降低PAPR兩種方法有兩個特性，第一個特性為不破壞SFBC的正交性; 第二個特性為不需額外傳送旁帶訊息至接收端。此外，本論文亦提出一偵測旁帶訊息的方式，模擬結果顯示系統的位元錯誤率(Bit Error Rate, BER)性皆可以貼近於接收端完美已知旁帶訊息的系統BER效能。

Selected mapping (SLM) is a well-known technique used to reduce the peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing (OFDM) systems. Although SLM scheme can reduce PAPR efficiently, the side information (SI) must be transmitted to the receiver to indicate the candidate signal that generates the OFDM signal with the lowest PAPR. Robust channel coding schemes are typically adopted to prevent erroneous decoding of SI, leading to the lower bandwidth efficiency. To reduce PAPR efficiently and avoid the bandwidth efficiency loss caused by the transmission of SI, two novel PAPR reduction methods are proposed in SFBC MIMO-OFDM systems with two transmitter antennas that employs the Alamouti coding. The candidate signals are constructed in the frequency-domain and time-domain in the first proposed scheme and the second proposed scheme, respectively. In addition, the orthogonality of the space frequency block code is preserved resulting in the data recovery and the corresponding SI can be easily obtained from the conventional Alamouti detection method for both transmission methods. Simulation results show that the BER performance of a SFBC MIMO-OFDM system with the proposed SI detection algorithm is very close to that of perfect SI detection if the extension factor is larger than 1.3.

論文審定書 i
序言 ii
中文摘要 iii
Abstract iv
目錄 v
圖次 vii
表次 viii
第一章 導論 1
1.1 研究背景 1
1.2 研究動機 3
1.3 論文架構 3
第二章 系統介紹 5
2.1 正交分頻多工系統之基本架構 5
2.2 時空編碼及多輸入多輸出 9
2.3 多天線的峰均值功率比 12
第三章 傳統多根天線下降低PAPR的方法16
3.1 傳統的SLM 16
3.2 Ordinary SLM與Simplified SLM 17
3.3 Blind SLM 19
第四章 不具旁訊息傳送的降低PAPR方法20
4.1 頻域上產生候選信號的方法 21
vi
4.2 時域上產生候選信號的方法 24
第五章 接收機的設計 29
5.1 傳送功率的正規化 30
5.2 偵測旁訊息 32
第六章 模擬結果與討論35
6.1 複雜度的比較 35
6.2 PAPR效能的比較 37
6.3 旁訊息的偵測機率 40
6.4 系統的錯誤率 42
第七章 結論 46
參考文獻 47
中英對照表 53
縮寫對照表 57

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