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博碩士論文 etd-0811108-172838 詳細資訊
Title page for etd-0811108-172838
論文名稱
Title
單載波系統中頻域通道補償及干擾消除之研究
Investigation on the Frequency Domain Channel Equalization and Interference Cancellation for Single Carrier Systems
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
54
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2008-07-29
繳交日期
Date of Submission
2008-08-11
關鍵字
Keywords
干擾消除、頻域通道補償單載波系統、符元區間干擾、腓特比架構、依序干擾消除
Viterbi algorithm, inter-block interference (IBI), interference cancellation, successive interference cancellation (SIC), Single Carrier System with Frequency Domain Equalization (SC-FDE)
統計
Statistics
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中文摘要
在循環字首單載波系統中,循環字首的使用可以避免符元區間干擾,並使得通道的效應由線性摺積轉換為迴旋摺積,進而簡化接收端頻域通道補償的運算複雜度。然而,傳送循環字首卻會降低資料傳輸效率。為了增加系統的資料傳輸效率,我們將針對頻域通道補償的單載波系統進行研究。當頻域通道補償運用在不具有循環字首的單載波系統時,會造成符元區間干擾而使得解調誤碼率提高。為了降低干擾影響並改善系統效能,本論文提出一種新穎的干擾消除架構。在經過頻域通道補償之後,我們證明干擾來自於時域上一個符元區間的末端幾個符元,且這個干擾主要分布於這個時域上符元區間的前後兩端。基於這個現象,本論文利用最大似然法則來估測造成干擾的調變符元,以重建並消除干擾。為了簡化運算複雜度,我們更進一步提出一種逐步消除干擾的方法,並利用腓特比架構加以實踐。模擬結果顯示,本論文所提出的方法能大幅的改善頻域通道補償單載波系統的誤碼率。而在指數衰減的多路徑通道中,本論文提出的架構更可以達到和循環字首單載波系統相近的系統效能。
Abstract
In the single carrier systems with cyclic-prefix (CP), the use of CP does not only eliminate the inter-block interference (IBI), but also convert linear convolution of the transmitted signal with the channel into circular convolution, which leads to the computation complexity of the frequency domain equalization (FDE) at the receiver is reduced. Unfortunately, the use of CP considerably decreases the bandwidth utilization. In order to increase the bandwidth utilization, the single carrier systems with frequency domain equalization (SC-FDE) is investigated. When FDE is used in a single carrier system without CP, the IBI is induced by the modulated symbols and then the bit-error rate (BER) is increased. To reduce the interference and then improve the system performance, a novel interference cancellation scheme is proposed in this thesis. After FDE, it is shown that interference is induced from the right end of a time domain signal block and most of the interference is located at both ends of an equalized time domain signal block. Based on this observation, the modulated symbols which induce the interference are detected according to the maximum-likelihood (ML) principle and then the interference is regenerated and eliminated. For simplifying the computation complexity, we further propose a successive interference cancellation scheme, which is implemented by using the Viterbi algorithm. The simulation results demonstrate that the proposed scheme improves BER performance significantly in SC-FDE systems. In addition, the proposed architecture has comparable BER performance with the SC-CP systems when the multi-path channel is exponentially decayed.
目次 Table of Contents
第一章 導論 ……………………………………………1
第二章 系統模型……………………………………………4
2.1有循環字首單載波系統……………………………………………4
2.2無循環字首單載波系統……………………………………………8
第三章 分析傳統干擾消除方法……………………………………………12
3.1傳統干擾消除方法……………………………………………12
3.2傳統干擾消除方法缺點……………………………………………15
第四章 提出改善的干擾消除方法……………………………………………16
4.1 最大似然法則……………………………………………16
4.2依序解調調變符元的概念……………………………………………17
4.3腓特比架構……………………………………………18
第五章 系統模擬……………………………………………25
第六章 結論與未來工作……………………………………………38
6.1 結論……………………………………………38
6.2 未來工作……………………………………………38
英文縮寫對照表……………………………………………39
中英文對照表……………………………………………41
參考文獻……………………………………………43
參考文獻 References
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