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研究生： 許益嘉
Yi-chia Hsu
論文名稱： 多存取正交分頻多工之共同載波偏移校正的訊號干擾功率比分析
Signal to Interference Power Ratio Analysis for OFDMA with Common Carrier Frequency Offset Correction
指導教授： 張大中
Dah-chung Chang
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 通訊工程學系
Department of Communication Engineering
畢業學年度： 97
語文別： 中文
論文頁數： 83
中文關鍵詞： 多使用者干擾 、子載波間內干擾 、共同載波頻率偏移 、載波頻率偏移 、訊號干擾比分析 、正交分頻多工存取
外文關鍵詞： MUI, common carrier frequency offset, orthogonal frequency division multiple access, CFO, SIR, CCFO, ICI, OFDMA, multiuser interference, carrier frequency offset, signal-to-interference power ratio
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    • 多存取正交分頻多工系統因載波頻率偏移所產生的子載波間干擾以及多使用者干擾，在文獻中已被提出許多解決方法。在我們的研究中，接收端的共同載波頻率偏移補償方法是個創新且容易提升系統效能的架構，我們已發現在交錯分配系統中存在一個子載波間干擾常數的特性。本篇論文主要利用訊號干擾比的分析清楚呈現新的演算法的效能，並且使用不同觀點切入我們的分析結果，並於模擬結果中做多元的探討。最後在訊號干擾比與位元錯誤率的模擬分析中，可結論於多存取正交分頻多工系統接收端使用共同載波頻率偏移的補償方法將能得到較過去更為優異的性能。

    Many solutions can be found in the literature to solve the effect of inter-carrier interference (ICI) and multiuser interference (MUI) due to multiple carrier frequency offsets (CFOs) presented in a multi-access orthogonal frequency division multiplexing (OFDMA) system. In our study, common carrier frequency offset (CCFO) correction at the OFDMA receiver is a novel and feasible scheme to reach the improvement of system performance. In addition, we also found the factor that can completely remove the ICI effect in interleaved OFDMA systems. This paper demonstrates the efficiency of the proposed method through the signal to interference ratio (SIR) analysis. We show a variety of analytic measures in simulation results and conclude that the proposed CCFO correction method can achieve better system performance than the past works.

    第1章 序論...............................................1 1.1 前言................................................1 1.2 章節架構介紹........................................3 第2章 OFDMA上行系統與模型................................5 2.1 OFDMA上行系統傳送端模型.............................5 2.2 OFDMA子載波配置.....................................6 2.3 OFDMA接收機載波頻率偏移補償法.......................7 2.3.1 直序解調法......................................7 2.3.2 CLJL解調法......................................9 2.3.3 HL解調法.......................................10 2.4 共同載波偏移補償法.................................12 2.4.1 以共同載波偏移補償OFDMA系統....................12 2.4.2 系統達MMSE之共同載波偏移估計法.................15 2.5 在Interleaved-OFDMA系統中ICI問題與補償.............16 2.5.1 ICI問題分析與補償..............................16 2.5.2 適應性常數追蹤補償ICI..........................18 第3章 OFDMA系統之SIR分析................................20 3.1 訊號干擾比定義.....................................20 3.2 CLJL與HL解調法SIR分析..............................21 3.2.1 CLJL解調法分析.................................21 3.2.2 HL解調法分析...................................24 3.3 以共同載波偏移補償解之OFDMA系統SIR分析.............27 3.4 在Interleaved-OFDMA系統中以常數項補償ICI之SIR分析..30 3.5 SIR分析討論........................................31 第4章 模擬與結果分析....................................33 4.1 系統模擬架構與參數設定.............................33 4.2 載波頻率偏移與通道頻率響應估測.....................35 4.3 模擬結果...........................................36 4.3.1 CLJL法與HL法於交錯分配之ICI問題................36 4.3.2 ICI常數追蹤分析................................37 4.3.3 系統達MMSE之共同載波偏移補償...................40 4.3.4 訊號干擾比理論與模擬比較圖.....................42 4.3.5 訊號干擾比曲線比較圖...........................44 4.3.6 位元錯誤率曲線比較圖...........................53 4.3.6.1 交錯分配系統常數ICI補償比較................53 4.3.6.2 交錯分配系統CCFO補償比較...................58 4.3.6.3 子頻帶系統CCFO補償比較.....................63 4.3.6.4 於8使用者的錯誤率比較......................67 第5章 結論..............................................70 參考文獻................................................71

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