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研究生:劉孟達
論文名稱:迴旋碼通訊系統之等化及解碼研究
論文名稱(外文):On Equalization and Decoding for Convolutional Coded Systems
指導教授:邱茂清邱茂清引用關係
學位類別:碩士
校院名稱:國立暨南國際大學
系所名稱:電機工程學系
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:2002
畢業學年度:90
語文別:英文
論文頁數:82
中文關鍵詞:等化器
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為了要改善高速無線區域網路中的等化技術效率,在此篇論文中我們將討論一些演算法。我們考慮的系統為IEEE 802.11b中的包裹二進式迴旋碼( packet binary convolutional code - PBCC )模式。等化器被置放於接收端去克服符號間干擾( intersymbol interference - ISI )並對PBCC做解碼的動作。在ISI通道上,檢視編碼的訊號最好的方法是最大相似性序列估計( maximum-likelihood sequence estimation - MLSE ),並可結合解碼的動作。然而,MLSE演算法當它的延遲展開太大或是迴旋碼的約束長度太長的話,那它的計算複雜度就會相當的高。因此,我們提出了一個新方法叫做近態演算法( near-state algorithm ),它可以大量減少狀態的個數。另外,它還有一個好處就是它有一個非常規則的格狀架構因此可以容易的使用VLSI技術來實現。
在此篇論文中,我們亦會提及基本的等化技術跟一個802.11b的簡介,並且會提供一些演算法的包裹錯誤率來比較它們的效能表現。近態演算法的效能表現並不好,未來需要找到進一步的補償方法。

In order to improve the efficiency of equalization in high speed transmission wireless local area network (WLAN), some algorithms are discussed in this thesis. We consider a receiving system for IEEE 802.11b with the packet binary convolutional code (PBCC). An equalizer is developed in the receiver to combat intersymbol interference (ISI) and decode the PBCC. It is well known that maximum-likelihood sequence estimation (MLSE) joint with decoding in the maximum-likelihood (ML) sense is the optimum way to detect coded signals on ISI channels. However, the computational complexity of the MLSE algorithm is extremely high for systems with large delay spread or large constraint length of the convolutional code. Therefore, a new method called near-state algorithm is proposed, which can significantly reduce the number of states. In addition, one advantage of this algorithm is that it has a regular trellis structure, and therefore can be easily implemented by VLSI technologies.
Basic principles of equalization techniques and a simple introduction of 802.11b are illustrated in this thesis. Some simulations are conducted to present the performance of packet error rates of those algorithms. The performance of the near-state algorithm is not good, but it can find some auxiliaries to compensate further.

摘要…………………………………I
致謝…………………………………II
目錄…………………………………III
第一章:簡介………………………1
第二章:等化技術…………………3
第三章:通道及系統模型…………17
第四章:格狀基礎等化演算法……29
第五章:模擬結果…………………49
第六章:結論………………………81

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