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研究生:羅際華
研究生(外文):Chi-Hua Lo
論文名稱:結合子頻帶排列之漸進遞迴式選擇映射法以降低STBC MIMO-OFDM系統之峰均值功率比
論文名稱(外文):A Progressive SLM Scheme Based on Subband Permutation for PAPR Reduction in STBC MIMO-OFDM Systems
指導教授:洪賢昇
指導教授(外文):Hsien-Sen Hung
學位類別:碩士
校院名稱:國立臺灣海洋大學
系所名稱:電機工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:48
中文關鍵詞:多輸入多輸出正交分頻多工峰均值功率比空時區塊編碼選擇映射子頻帶排列
外文關鍵詞:MIMO-OFDMpeak-to-average power ratiospace-time block codeselected mappingsubband permutation
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由於多輸入多輸出正交分頻多工(MIMO-OFDM)技術有著引人關注的高資料傳輸率,所以被應用在高效能的4G寬頻通訊系統上。但是其主要的缺點之一就是傳輸訊號具有較高的峰均值功率比(PAPR),使得系統效能降低,導致射頻功率放大器的成本增加。本論文中,我們考慮結合空時區塊編碼於MIMO-OFDM的系統,並提出降低PAPR的方法。所提的方法對OFDM符元進行子頻帶排列以產生更多訊號組合,並使用漸進遞迴式選擇映射架構,以逐步演算更新方式來降低PAPR。
  經由電腦模擬分析結果,我們提出的結合子頻帶排列法之漸進遞迴式選擇映射技術在相同的離散傅立葉計算複雜度條件下,與傳統個別式選擇映射,並列式選擇映射和漸進遞迴式選擇映射相比,有更佳的PAPR降低效能,但需要額外位元來傳送給接收端。
Because multiple-input multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) technology has the prominent feature of high data rate, it has been applied on 4G wide band communication systems. However, the main weakness of MIMO-OFDM lies in its high peak -to-average power ratio(PAPR), which lowers the efficiency, leading to the cost increase of RF power amplifier. In this thesis, we deal with a hybrid MIMO-OFDM system with the space-time block code (STBC) incorporated and propose a new method for PAPR reduction. The proposed method uses subband permutation (SP) on OFDM symbols to produce more symbol candidates and adopts the progressive selected mapping (SLM) scheme in a recursive fashion to reduce PAPR, under the same computational complexity assessed by the required number of Fourier transform.
Simulation results show that, the proposed method has the best capability of reducing PAPR among the traditional methods of Individual SLM, Concurrent SLM ,and Progressive SLM. However, the proposed method requires more side-information (SI) bits delivered to the receiver.
第一章 導論..............................1
1.1 前言.............................1
1.2 研究動機..........................4
1.3 論文架構介紹......................5

第二章 STBC MIMO-OFDM系統介紹.............6
2.1 OFDM技術原理......................6
2.1.1 OFDM基本架構.................6
2.1.2 串列與並列的轉換..............8
2.1.3 保護區間與循環字首............9
2.1.4 峰均值功率比.................11
2.2 MIMO-OFDM系統介紹.................13
2.3 Alamouti傳送分集架構..............16

第三章 相關PAPR技術回顧................19
3.1 選擇映射法.......................19
3.1.1 個別式選擇映射法......................................19
3.1.2 並列式選擇映射法......................................22
3.2 子頻帶排列法......................25
3.3 漸進遞迴式交插法..................27

第四章 結合子頻帶排列之漸進遞迴式選擇映射法.....................................30
4.1 結合子頻帶排列之漸進遞迴式選擇映射法.....................................30
4.2 模擬結果與討論....................35

第五章 結論與展望......................45
參考文獻................................46

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