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研究生:蘇姿菁
研究生(外文):Tzu-Ching Su
論文名稱:在Rayleigh衰退通道及AWGN通道之非同調區塊編碼QAM
論文名稱(外文):Noncoherent Block-Coded 8QAM for the Rayleigh Fading Channel and the AWGN Channel
指導教授:魏瑞益
學位類別:碩士
校院名稱:國立中央大學
系所名稱:通訊工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:95
語文別:中文
論文頁數:50
中文關鍵詞:正交振幅調變GLRT檢測非同調頻寬效益
外文關鍵詞:spectrally efficientQAMGLRT detectionnoncoherent
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我們在非同調GLRT檢測器上,研究使用多層次編碼的區塊編碼正交振幅調變(NBC-QAM),在衰退通道下,我們提出兩個方法對傳送QAM時通道係數的振幅大小做估測,在AWGN通道下,我們提出一個適用於已知通道振幅大小的GLRT檢測器及其相關的非同調距離。我們分別推導由多層次編碼得到的區塊編碼QAM之最小非同調距離,並根據此最小非同調距離的分析,提出NBC-8QAM新的建構方式,在NBC-QAM的系統中,借由改變星座圖內外圈比使其錯誤效能最佳化。模擬結果亦顯示,NBC-QAM新的建構方式有較好的錯誤效能。
We investigate block-coded QAM constructed by multilevel coding for the noncoherent generalized likelihood ratio test (GLRT) detector. For the fading channel, we proposed two method to estimate the fading amplitude. For the AWGN channel, we derive a new GLRT detector and the corresponding distance. The minimum noncoherent distance of block-coded QAM is derived and new construction of noncoherent block-coded QAM (NBC-QAM) are proposed accordingly. In the NBC-QAM scheme, the error performance can be optimized by adjusting the constellation. The superior error performances of NBC-QAM are verified by simulation results.
第一章 緒論....................................................................................................... 1
第二章 回顧....................................................................................................... 4
2.1 論文[1]的研究成果............................................................................. 4
2.1.1 GLRT 檢測器及能量控制.......................................................... 4
2.2 接近最佳的線性複雜度解調.............................................................. 5
2.3 非同調區塊編相位鍵移調變(NBC-MPSK).................................. 7
2.3.1 NBC-MPSK ................................................................................ 7
2.4 非同調區塊編碼正交振幅調變( NBC-QAM ) .................................. 9
2.4.1 非同調距離與星座圖................................................................ 9
2.4.2 能量控制.................................................................................. 10
2.4.3 解碼演算法.............................................................................. 12
第三章 NBC-8QAM 用於衰退通道............................................................... 14
3.1 非同調距離分析與編碼方式............................................................ 14
3.1.1 非同調距離分析...................................................................... 14
3.1.2 NBC-8QAM 的編碼方式......................................................... 17
3.2 解碼演算法........................................................................................ 18
3.3 Rayleigh 衰退通道下的模擬結果與比較.......................................... 22
第四章 NBC-QAM 用於AWGN 通道........................................................... 36
4.1 AWGN 通道的GLRT 檢測器............................................................ 36
4.2 距離分析及編碼方式........................................................................ 37
4.2.1 非同調距離分析...................................................................... 37
4.2.2 編碼架構.................................................................................. 39
4.3 AWGN 通道下的模擬結果................................................................ 40
第五章 結論..................................................................................................... 48
參考文獻........................................................................................................... 49
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