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研究生:陳繹全
研究生(外文):Yi-Chuan Chen
論文名稱:平行干擾消除法應用於WCDMA多用戶同步器
論文名稱(外文):WCDMA Multiuser Synchronization Using Parallel Interference Cancellation
指導教授:李宇旼李宇旼引用關係
指導教授(外文):Yumin Lee
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:電信工程學研究所
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:英文
論文頁數:60
中文關鍵詞:平行干擾消除法多用戶偵測碼獲得同步追蹤
外文關鍵詞:Parallel Interference CancellationMultiuser Detectionacquisitionsynchronizationtracking
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最近幾年,第三代無線通訊系統因為有著傳輸速率快以及系統容量高的優點,所以已經被廣泛的研究。其中最被看好的一種規格是Wideband Code Division Multiple Access (W-CDMA) Frequency Duplex-Division (FDD) mode。在W-CDMA接收端中,因為需要正確的碼相位來解展頻接收到的訊號,因此碼同步必須是首先被完成的。碼同步可以分為兩個部分:獲得(acquisition)和追蹤(tracking)。獲得的功能是將傳送端和接收端之間的碼相位差縮小到半個微元(chip)之內,而追蹤的功能則是將此相位差進一步的縮減並維持碼同步。然而,如同資料偵測,同步也會受到多重擷取干擾(multiple access interference)的影響。除此之外,追蹤無法良好的工作於一個快速改變的通道。我們提出的方法是在每一個時槽(time slot)做碼獲得來取代追蹤的功能,並且利用平行干擾消除器來除去多重擷取干擾,之後再重新做一次碼獲得來得到比較準確的通道延遲和通道增益。最後在模擬的結果之中,我們可以看到應用平行干擾消除法的碼獲得確實可以改善接收器的表現,特別是在不同路徑的平均功率一樣的通道當中。

In recent years, third generation (3G) wireless cellular communication systems have been studied extensively because of its high data rate and high capacity. The most promising candidate is Wideband Code Division Multiple Access (W-CDMA) Frequency Duplex-Division (FDD) mode. In W-CDMA receiver, because receiver needs accurate code phase to despread received signal, thus code synchronization should be first completed. Code synchronization can be divided into two parts: acquisition and tracking. Acquisition brings code phase offset into less than a chip duration and tracking minimize the offset and maintain synchronization. However, like bits detection, multiple access interference (MAI) degrades synchronization performance. In addition, tracking does not work well if channel varies rapidly. We propose a method that performs acquisition in each slot instead of tracking, and parallel interference cancellator (PIC) is used to subtract MAI, and then re-acquire synchronization to obtain more accurate channel delays and channel gains. In the simulation results, it is shown that re-acquisition with PIC really improves receiver
performance, especially in the equal-power paths channel.

Contents
Abstract
Acknowledgement
1 Introduction
2 W-CDMA Physical Layer Specifications
2.1 Uplink Dedicated Physical channels
2.2 Uplink Spreading and Modulation
2.2.1 DPCCH/DPDCH Spreading2.2.2 Channelization codes
2.2.3 Scrambling Codes
2.2.4 Modulation
2.3 Channel Model
3 Conventional Synchronization and The Proposed Method 25
3.1 Introduction
3.2 Acquisition
3.2.1 Conventional BPSK Spread Spectrum Systems
3.2.2 Matched Filter Acquisition
3.3 Tracking
3.3.1 Introduction
3.3.2 Baseband Early-Late Delay-Lock Tracking Loop
3.4 Multiuser Acquisition with Parallel Interference Cancellation
3.4.1 Introduction
3.4.2 Proposed Acquisition Method
3.4.3 Channel Estimation 3.4.4 Parallel Interference Cancellation
3.4.5 Re-Acquisition
4 Simulation Results
4.1 Simulation Setup
4.2 Simulation Results
5 Conclusion 53

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[2] W. C. Jakes, Microwave Mobile Communications, New York: Wiley, 1974.
[3] P. Dent, G. E. Bottom, and T. Croft, "Jakes fading model revisited," IEEE Electronics Letters, vol. 29, pp.1162-1163, June 1993.
[4] R. L. Peterson, R. E. Ziemer, and D. E. Borth, Introdunction to Spread Spectrum Commnications, Prentice Hall, 1995.
[5] M. K. Simon, J. K. Omura, R. A. Scholtz, and B. K. Levitt, Spread Spectrum Communications Handbook, McGraw-Hill, 1994.
[6] Andrew J. Viterbi, Principles of Spread Spectrum communication, Addison-Wesley Publishing Company, 1995.
[7] S. G. Glisic, "Automatic decision threshold level control in direct-sequence spread-spectrum systems," IEEE Trans. on Commn., vol. 39, pp. 187-192, Feb. 1991.
[8] S. Verdu, Multiuser Detection, Cambridge Univ. Press, 1995.
[9] J. Caffery and G. L. Stuber, "Effects of multiple-access interference on the noncoherent delay lock loop," IEEE Trans. on Commn., vol. 48, pp. 2109-2119, Dec. 2000.
[10] Wern-Ho Sheen and G. L. Stuber, "Effects of multipath fading on delay-locked loops for spread spectrum systems," IEEE Trans. on Commn., vol. 42, pp. 1947-1956, Apr. 1994.

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