直接序列展頻系統利用干擾消除與M_ary正交調變技術的分析與模擬; Simulation and Performance Analysis of Interference Cancellation with M-ary Orthogonal Modulation for DS-CDMA system

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题名:	直接序列展頻系統利用干擾消除與M_ary正交調變技術的分析與模擬;Simulation and Performance Analysis of Interference Cancellation with M-ary Orthogonal Modulation for DS-CDMA system
作者:	劉威廷;Wei-Ting Liu
贡献者:	電機工程研究所
关键词:	多人使用干擾;干擾消除機制;分碼多重調變;multiple access interference;interference cancellation scheme;cdma
日期:	2002-05-29
上传时间:	2009-09-22 11:46:17 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	本篇論文使用了M-ary 正交調變的DS-CDMA系統，模擬結果顯示出M-ary正交調變可以降低多人使用干擾效應 (MAI)。由於系統通道模型為AWGN與Rayleigh fading，所以使用了RAKE接收架構與Channel Estimation來抵抗多路徑通道的衰落的效應。接著我們分析與模擬不同的干擾消除機制(IC)去消除MAI的干擾影響，在探討這些干擾消除機制時，將可瞭解平行干擾消除機制(PIC)與串聯干擾消除機制(SIC)的優缺點。同時我們也考慮了混合干擾消除機制(HIC)，因為它能夠改善PIC與SIC的缺點。論文中的模擬結果顯示，使用了以上所述的技術後，可以得到較好的效能結果。 In this thesis, we use the M-ary orthogonal modulation in DS/CDMA system. The results show the Multiple Access Interference (MAI) is reduced due to M-ary orthogonal modulation compared with the case without orthogonal modulation. The system simulation models include AWGN and Rayleigh fading channel. So the rake structure and channel estimation technique can be used to combat multipath fading. Then we analyze and simulate different kinds of interference cancellation (IC) schemes to overcome MAI in DS/CDMA. Among ICs, we can see the advantage and disadvantage of traditional parallel interference cancellation (PIC) and serial interference cancellation (SIC). A hybrid interference cancellation by combining SIC and PIC is also considered. It can improves the disadvantage of PIC and SIC. The simulation results show that the performance enhancement can be achieved through M-ary orthogonal modulation, channel estimation and Improved IC technique.
显示于类别:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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