https://scholars.lib.ntu.edu.tw/handle/123456789/122242
標題: | 相關性編碼正交分頻多工系統之次載波間相互干擾之研究 Intercarrier Interference of Correlatively Coded OFDM |
作者: | 吳佳勳 Wu, Chia-Hsun |
關鍵字: | 相關性編碼正交分頻多工系統;次載波間相互干擾;載波干擾比;訊號共軛法;Correlatively Coded OFDM;Intercarrier Interference;carrier-to-intercarrier power ratio;data-conjugate method | 公開日期: | 2006 | 摘要: | 本篇論文所要探討的主題是相關性編碼正交分頻多工(Correlatively Coded Orthogonal Frequency Division Multiplexing,簡稱 CE-OFDM)訊號之次載波間的相互干擾(Inter-carrier Interference,簡稱 ICI)。首先,吾人先對 CE-OFDM 訊號帶有保護區間(Guard Interval)為循環字首(Cyclic Prefix)及全為零的傳輸資料(Zero Padding)分別建立所屬之 ICI 問題數學模型。其次,則使用所定義之兩個指標:平均載波干擾比(Average Carrier to Interference Ratio)及最小載波干擾比(Minimum Carrier to Interference Ratio)著眼於正規化頻率偏移量(Normalized Frequency Offset)的比值,個別衡量以上所述兩種訊號在接收端遭受頻率偏差所導致的 ICI 影響程度。接下來,吾人對CE-OFDM 訊號及未編碼之OFDM 訊號採用訊號共軛法(Data-Conjugate Method)消除因為頻率偏差所致之ICI。最後,吾人會組成訊號之參數對已編碼及未編碼之訊號做效能方面之比較。 This thesis presents the investigation of inter-carrier interference (ICI) in correlatively coded orthogonal frequency-division multiplexing (OFDM) communication system. First of all, we establish the mathematical model of the ICI problem individually for CP-OFDM and ZP-OFDM, which are the correlatively coded OFDM signals with cyclic prefix and with zero padding, respectively. Then we will take the average and minimum carrier-to-interference radio (CIR) respect to normalized frequency offset as two major indicators when measuring the ICI problem. Secondly, the data-conjugate method of ICI self-cancellation is studied to reduce ICI effectively and the system performance of the data-conjugate method is compared with the normal OFDM. Finally, we will make a comparison between the systems which we have discussed above in different system parameters in the conclusion chapter. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/58806 | 其他識別: | en-US |
顯示於: | 電信工程學研究所 |
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ntu-95-R93942085-1.pdf | 23.31 kB | Adobe PDF | 檢視/開啟 |
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