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http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37304
標題: | 存在載波頻率偏移與相位偏差之OFDM 通訊系統之窗框設計 WINDOW DESIGN FOR OFDM SYSTEMS IN THE PRESNECE OF CARRIER FREQUENCY OFFSET AND PHASE NOISE |
作者: | Tseng-Wen Feng 馮曾文 |
指導教授: | 鄭士康(Shyh-Kang Jeng) |
關鍵字: | 正交分割頻率多路傳輸,框架,單輸入輸出,多輸入輸出,相位雜訊,載波頻率,偏移, OFDM,Window,SISO,MIMO,Phase Noise,CFO, |
出版年 : | 2008 |
學位: | 碩士 |
摘要: | 正交分割頻率多路傳輸系統被廣泛的運用在無線通訊中,原因在於它能有效抵抗多路徑的通道衰減,並擁有低複雜度的接收機。其擁有這些優點,在於其假設系統中傳輸端與接收端的參數,可以彼此完全吻合。這些參數包括載波頻率偏移與相位偏差。當系統中此兩種參數存在偏差的時候,正交頻率分割多路傳輸系統中子載波的正交性便會被破壞,如此便會造成子載波間相互干擾。在這篇論文中,我們在接收端中,設計框架來改進系統效能。我們利用相位偏差的統計特性與載波頻率偏移的資訊,來設計框架的變數,以達到改善系統效能的目的。我們並將此一方法應用在多輸入輸出的系統中。從實驗中的數據發現,此一方法亦可增進多輸入輸出系統的效能。 OFDM transmission scheme has drawn a lot of attention because of its robustness against frequency-selective channels and low complexity receiver. Those bene‾ts are based on the assumption that the parameters between the transmitter and receiver are perfectly matched. However, the inevitable mismatches will lead to some important impacts to OFDM, like CFO and phase noise. Due to these two mismatches, the orthogonality between the subcarrier is destroyed, which will lead to inter-carrier interference in the system. In this thesis, we consider the window design technique for OFDM systems in the presence of CFO and phase noise. Exploiting the statistics of phase noise, we proposed a window technique to minimize the variance of ICI and channel noise. Then we extend this method from single-input single-output (SISO) to multiple-input multiple-output (MIMO) OFDM systems. Simulation results show that our proposed method can slightly improve the system performance. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37304 |
全文授權: | 有償授權 |
顯示於系所單位: | 電信工程學研究所 |
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ntu-97-1.pdf 目前未授權公開取用 | 1.1 MB | Adobe PDF |
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