臺灣博碩士論文加值系統

　　正交分頻多工技術(Orthogonal Frequency-Division Multiplexing, OFDM )為多載波傳輸技術，它擁有更高的頻譜使用效率以及有效地對抗頻率選擇性衰落(Frequency Selective Fading)通道與多重路徑所產生的符元間干擾(Inter-Symbol Interference, ISI)。但OFDM系統的子載波旁瓣會產生很大的旁頻帶(Out-of-Band, OOB)干擾，因此會利用旁瓣抑制技術降低旁頻帶干擾，例如保護頻帶、消除子載波或子載波加權技術等。
　　本論文針對OFDM系統旁瓣抑制效能提出量測的方法，使用旁頻帶拒斥(Out-Of-Band Rejection, OBR) 的方式來評估旁瓣抑制技術之抑制干擾的效能。並經由MATLAB/Simulink軟體與軟體定義無線電平台建置量測系統效能，量測並驗證本論文提出之方法可以評估旁頻帶抑制技術的好壞。

　　Orthogonal Frequency-Division Multiplexing (OFDM) is a technique of multi-carrier transmission. It has higher spectral efficiency and can also be robust against to the frequency selective fading channels and inter-symbol interference (ISI) caused by multi-path. However, the high sidelobe of the OFDM system will cause out-of-band interference. Therefore, we use sidelobe suppression techniques, such as guard band, cancellation subcarrier and subcarrier weighting techniques, to avoid out-of-band interference.
　　In this thesis, we propose a performance measurement for the sidelobe suppression techniques in OFDM system, which uses the out-of-band rejection method to evaluate the performance of sidelobe suppression techniques. Using MATLAB/Simulink software and software-defined radio devices, we verify the measurement scheme which can evaluate the performance of sidelobe suppression techniques.

摘要 I
ABSTRACT II
誌謝 III
目錄 IV
圖目錄 VI
表目錄 IX
第一章 導論 1
第二章 正交分頻多工系統介紹 3
2-1 OFDM系統簡介 3
2-2 OFDM系統模型 4
2-3無線通道模型 6
2-4 OFDM系統旁頻帶干擾介紹 11
第三章　旁頻帶干擾抑制技術 15
3-1 保護頻帶子載波 15
3-2 消除子載波技術 16
3-3 子載波加權技術 19
第四章 正交分頻多工系統之旁頻帶抑制效能量測方法 22
4-1最小輸入靈敏度(MINIMUM INPUT SENSITIVITY) 22
4-2 鄰近通道拒斥 23
4-3 使用旁頻帶拒斥評估旁頻帶抑制技術之抑制效能方法 26
4-4 電腦軟體定義無線電量測系統架構 26
第五章　旁頻帶抑制技術效能量測系統與架構 31
5-1 OFDM系統實現 31
5-2 以旁頻帶拒斥方法評估保護頻帶抑制效能 38
5-3 以旁頻帶拒斥方法評估消除子載波與子載波加權抑制效能 45
5-4 量測結果與分析 54
第六章　總結 55
參考文獻 56

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