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研究生:林明燕
研究生(外文):Ming-Yen Lin
論文名稱:在遠近效應環境下DS-CDMA無線通訊系統之窄頻干擾抑制技術
論文名稱(外文):A Narrowband Interference Suppression Scheme for DS-CDMA Wireless Communications in Near-Far Environments
指導教授:王晉良
指導教授(外文):Chin-Liang Wang
學位類別:碩士
校院名稱:國立清華大學
系所名稱:通訊工程研究所
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:中文
中文關鍵詞:NBI suppressionTPPIC
相關次數:
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在設計無線展頻分碼多工(CDMA)系統時,消除窄頻干擾(NBI)的技術是很重要的,尤其是在窄頻干擾很大時候,能夠有效的消除這些干擾,就能改善系統的效能。在過去,有關這方面所提出來的技術,都只考慮每個使用者的功率都是相等的,也就是沒有考慮到遠近效應的環境,因為在實際的傳輸環境中,由於每個使用者對基地台的距離並非都是等距離的,一定會有遠近的差別,那麼基地台所收到的訊號就會因為距離的關係,使得近的使用者所發出的訊號會干擾到遠的使用者所發出的訊號。所以我們將提出一個可以解決這個問題的方法,以便能夠更實際的應用在實際的環境中。在本論文中,我們先介紹一些既有的方法,然後提出一個更有效的方法─提高偏移式預測器。這個方法是修正學長所提的修正偏移式預測器的演算法,使其在遠近效應的環境下,能夠有好的效果。電腦模擬的結果顯示,在低訊號雜訊比時,提高偏移式預測器的方法比傳統線性濾波器優越很多,也比學長所提出之方法還好;另一方面,與近似條件平均(ACM)非線性濾波器比較時,在低訊號雜訊比的情況下亦具有不錯之性能。接下來我們探討窄頻干擾在展頻分碼多工系統中的影響,所以我們將結合消除窄頻干擾的技術與展頻分碼多工偵測器,架構出完整的展頻分碼多工系統,應用前述之消除窄頻干擾的方法和學長所提出來的渦輪部分平行干擾消除方法合併在一起,分別具有消除窄頻干擾和來自別的使用者之干擾的效果。由模擬出來的結果可看出,加上了消除窄頻干擾的技術確實會使展頻分碼多工系統的效果更好;且消除窄頻干擾能力愈強者,其效果愈好。我們所提出來的提高偏移式預測器有相當不錯的性能。
Narrowband interference (NBI) suppression plays an important role in the performance of a direct-sequence code-division multiple-access (DS-CDMA) system. Although it is well known that a CDMA system possesses the feature of resistance to narrowband interference to some extent, it has been shown that employing interference suppression filters prior to signal despreading can further enhance the performance of a DS-CDMA system. Over the past two decades, there have been many researches concerned with the development of techniques for active NBI suppression. But, most of the NBI suppression techniques were not considered for near-far environments. In this thesis, we propose an enhanced offset predictor for NBI suppression in a near-far situation. The proposed scheme has better performance than the previous techniques. Finally, we discuss a combination of NBI suppression and multiuser detection, where turbo partial parallel interference cancellation is considered for combining with the proposed NBI suppression scheme. From simulation results, it is shown that the proposed NBI suppression method is essential for improving the performance of a CDMA system.

Abstract……………………..……………………………………....….i
Contents……………………..…………………………………….…..ii
List of Figures…………….….…………………………….….….…..iv
Chapter 1 Introduction
1.1 Narrowband Interference Suppression……………………....…...….3
1.2 Multiuser Detection for Direct-Sequence CDMA Systems........….....5
1.3 Outline of the Thesis ……...………………….……..……...….….…7
Chapter 2 Narrowband Interference Suppression
2.1 System Model …………...…………………………………........…10
2.2 Techniques for NBI Suppression………....…………….….…….....13
2.2.1 The Linear Predictor………………………………...……...13
2.2.2 The ACM Predictor………………………………...…....…15
2.2.3 The Improved Offset Predictor………………….....….…....16
Chapter 3 A NBI Suppression Scheme in Near-Far Environments
3.1 The Enhanced Offset Predictor…………………………….……….22
3.2 Simulation Results……………………………………….……..…..25
Chapter 4 Effects of NBI Suppression on Multiuser Detection
4.1 Multiuser Detection……………………………………….…...…...42
4.2 TPPIC with NBI Suppression………………………….….…...…...45
4.3 Simulation Results……………………………………….…………48
Chapter 5 Conclusions
5.1 Thesis Summary…………………………………………………….55
5.2 Future Work…………………………………………………………56
References

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