臺灣博碩士論文加值系統

正交分頻多工已被廣泛的應用於現今的無線網路中，但其對於相位雜訊相當敏感，所以近年來改善相位雜訊對OFDM影響的方法一直不斷的推陳出新，在本論中吾人探討改善相位雜訊對OFDM影響的方法，並使用人性化的圖形使用者介面供工程師進行快速模擬以判別接收機情況或供初學者學習。在本論文中，吾人歸納出了三種相位雜訊模型，並用MATLAB 將其功率頻譜密度、時域模型模擬出來，之後比較數種改善相位雜訊之消除法，最後採用ICI消去法作為本論文分析的主體。ICI消去法有許多更新的方法，在本論文中亦逐一的分析並用MATLAB 模擬其BER及星雲圖，可清楚的比較出其優劣。最後設計一圖形使用者介面將載波種類、相位雜訊參數、相位雜訊種類、ICI消去法種類等可變因素納入其中，並用星雲圖及EVM指標展現結果。

Recently, orthogonal frequency-division multiplexing (OFDM) is widely applied to many advanced wireless networks. However, the method is still sensitive to phase noise so that much research has been proposed to cope with the influence of the phase noise on OFDM system. In this thesis, we investigate methods for compensating the phase noise effect on OFDM, and use graphical user interface (GUI) for demonstration, thus giving system engineers and learners a convenient means to access the effect. First, we study three well-documented phase noise models, and simulate its power spectral density and time-domain model by employing the MATLAB® software. Next, we compare several existing compensation approaches for the phase noise, and then choose inter-carrier interference (ICI) cancellation scheme for its good tradeoff between performance and complexity. In this thesis, we investigate three ICI cancellation schemes including data-symmetric, data-conjugate, and data-convention methods, where the former performs best, and the latter is worst. Finally, based on the above results, we design a GUI window to illustrate phase noise effect on OFDM system, in which (1) carrier types, (2) phase-noise parameters, (3) phase-noise types, and (4) ICI cancellation schemes are adjustable. Signal constellation diagram and error vector magnitude (EVM) are included to demonstrate the receiver performance after ICI cancellation.

目錄
書名頁……………………………………………………………………I
論文口試委員審定書………………………………………………… II
授權書…………………………………………………………………III
中文摘要……………………………………………………………… IV
英文摘要 ………………………………………………………………VI
誌謝 ………………………………………………………………… VII
目錄………………………………………………………………… VIII
圖目錄 ………………………………………………………………… X
表目錄…………………………………………………………… XIII
第一章簡介 1
1.1 研究動機 1
1.2 各章提要 2
第二章 OFDM 系統及IEEE802.11a概述 3
2.1正交分頻多工系統 4
2.1.1 OFDM 訊號產生 5
2.1.2 保護區間(guard interval)與循環延展(cyclic extension) 7
2.2 IEEE802.11a 概述 9
2.2.1 PLCP 序文(preamble) 13
第三章 相位雜訊與OFDM系統 15
3.1振盪器相位雜訊簡介 15
3.2相位雜訊對OFDM系統之影響 16
3.3相位雜訊與OFDM之基本模型 18
3.4相位雜訊模型： 20
3.5改善相位雜訊之方法 29
3.6 抑制IEEE802.11a之OFDM 相位雜訊 30
3.6.1 ICI 轉換消除法(Data-conversion Cancellation scheme) 31
3.6.2 使用ICI轉換消除法改善OFDM系統之頻率位移 32
3.6.3 ICI 共軛複數消除法(Data-Conjugate Cancellation) 33
3.6.4 ICI 對稱消除法(Data-Symmetric Cancellation) 35
3.6.5 電腦模擬 36
第四章 利用圖形使用者介面表現相位雜訊對OFDM 系統影響 39
4.1 介紹GUI視窗、功能及基本操作 39
4.1.1 新增元件至視窗 40
4.1.2 排列物件(Align Objects) 41
4.1.3 設定元件屬性(Property) 42
4.2編排 GUI的程式(Programming the GUI) 44
4.3實例說明 46
4.4在GUI使用星雲圖表現消除相位雜訊對OFDM之影響 48
第五章 結論及未來研究方向 54
參考文獻

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