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研究生:高鈺倫
研究生(外文):Yu Lun Kao
論文名稱:使用循環前置碼於單載波系統之效能評估
論文名稱(外文):Performance Evaluation of Single Carrier System with Cyclic Prefix
指導教授:林源倍
指導教授(外文):Yuan-Pei Lin
學位類別:碩士
校院名稱:國立交通大學
系所名稱:電機與控制工程系
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:49
中文關鍵詞:循環前置碼單載波系統
外文關鍵詞:Cyclic PrefixSingle Carrier System
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近幾年來,OFDM(正交分頻多工)已經被廣泛地應用於許多無線通訊系統。OFDM系統無須藉由複雜的接收器克服多俓效應的干擾,但是它有高PAPR(峰值對平均功率比)的問題。此篇論文中,我們考慮單載波系統。它擁有很低的PAPR,而且整體的複雜度和OFDM一樣。我們將考量具有頻譜空乏效應之通道、通道估測和FEC(錯誤更正機制)對於這兩個系統的影響。模擬結果可以歸納出幾點重要的結論:單載波系統較能抵抗頻譜空乏效應之通道,且頻譜空乏效應之通道會使OFDM的效能變差。此外,單載波系統之效能比OFDM系統更容易受估測誤差影響。最後在實際位元錯誤率的考量下,我們可發現單載波系統比OFDM系統有較佳的效能。

In recent years, OFDM (Orthogonal frequency division multiplexing) has been applied many wireless systems because of its capability to elegantly cope with multipath interference, without requiring complex receiver implementations. It is also known that the OFDM suffers from the problem of high PAPR (peak to average power ratio). In this thesis, we consider the Single Carrier system for the application of wireless transmission. It has very low PAPR and the overall complexity is the same as the OFDM system. We will perform simulation of these two systems by considering the impact of spectral null channels, channel estimation and FEC (forward error correction). The simulation results allow some relevant conclusions: Single Carrier system is more resistant to the channel spectral nulls, which lead to severe performance flooring in the OFDM system. And Single Carrier system is more sensitive to estimated errors than the OFDM system. For a practical range of bit error rate, the Single Carrier system performs better than the OFDM system.

1 Introduction. . . . . . . . . . . . . . . . . . 1
1.1 Outline . . . . . . . . . . . . . . . . . . . 3
1.2 Notations . . . . . . . . . . . . . . . . . . 3
2 OFDM System . . . . . . . . . . . . . . . . . . 5
3 Single Carrier System . . . . . . . . . . . . . 7
4 Receiver Designs For The Single Carrier Systems 11
4.1 Zero-Forcing Receiver . . . . . . . . . . . . 11
4.2 Threshold Receiver . . . . . . . . . . . . . 13
4.3 MMSE Receiver . . . . . . . . . . . . . . . . 15
5 Channel Estimation. . . . . . . . . . . . . . . 19
5.1 Time Domain . . . . . . . . . . . . . . . . . 20
5.2 Frequency Domain . . . . . . . . . . . . . . 21
6 Performance Evaluation. . . . . . . . . . . . . 23
6.1 Rayleigh Fading Channels. . . . . . . . . . . 23
6.2 SUI Channels. . . . . . . . . . . . . . . . . 26
7 Conclusion . . . . . . . . . . . . . . . . . . 42

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