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研究生： 沈宥樂
Yu-Le Shen
論文名稱： 相差位元交錯編碼之16QAM
Differential Bit-Interleaved Coded 16QAM
指導教授： 魏瑞益
Ruey-Yi Wei
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 通訊工程學系
Department of Communication Engineering
論文出版年： 2013
畢業學年度： 101
語文別： 中文
論文頁數： 53
中文關鍵詞： 位元交錯編碼 、16QAM 、非同調 、相差編碼 、查詢表
外文關鍵詞： BICM, 16QAM, noncoherent, differential encoding, look-up table
相關次數： 點閱：15  下載：0 
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    • 位元交錯編碼調變是一個適合連續衰退通道的通道碼。在不完美的通道狀態資訊下，需要傳送前導符元做通道估測。當通道變化速度越快，前導符元須傳送較頻繁，所導致的速率損失也越大。所以在這篇論文裡我們使用16QAM調變，並串接位元交錯編碼調變與使用查表的相差編碼，接收端用非同調檢測，避免傳送前導符元速率損失的問題。模擬結果顯示，串接遞迴解碼的位元交錯編碼調變與使用查表的相差編碼，其錯誤率會比使用前導符元做通道估測的同調位元交錯編碼調變還要更好。

    Bit-interleaved coded modulation is a channel code that is suitable for continuous fading channel.To obtain channel state information,the transmitter periodically inserts pilot symbols to offer the receiver the ability to estimate channel amplitude and phase reference.When channel varies faster,the frequency of inserts pilot symbols should be higher,then it causes the rate loss.In this paper,we combine bit-interleaved coded modulation with differential encoding by a look-up table and use 16QAM modulation.At the receiver,we use noncoherent detector to avoid the rate loss.Simulation results show that combined bit-interleaved coded modulation and iterative decoding with differential encoding by a look-up table has better error performance than inserted pilot symbols with coherent detector.

    摘要 I Abstract II 致謝 III 第一章 緒論 1 1.1 研究動機 1 1.2 內容介紹 2 1.3 通道模型 4 第二章 回顧位元交錯編碼調變和使用查表的相差編碼 5 2.1 回顧位元交錯編碼調變 5 2.2 回顧使用查表的相差編碼 7 2.2.1 兩符號相差檢測 8 2.2.2 查表法精神與例子 9 2.2.3 查表法之演算法 10 2.2.4 建立16QAM的相差編碼表 12 2.2.5 使用查表的相差編碼可被描述成籬柵相差編碼 17 2.2.6 狀態數量縮減定理 18 第三章 位元交錯編碼調變串接使用查表的相差編碼 21 3.1 系統分析 21 3.1.1 軟式輸出 21 3.1.2 硬式輸出 22 3.2 模擬結果 23 3.2.1 軟式輸出和硬式輸出 23 3.2.2 使用前導符元做通道估測的同調位元交錯編碼調變 25 3.2.3 APSK 30 3.2.4 不同觀察區間長度的模擬結果 31 3.2.5 降低複雜度 32 第四章 交錯編碼調變使用遞迴解碼 34 4.1 硬式決策迴授 34 4.2 模擬結果 34 第五章 結論 41 參考文獻 42

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