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研究生:廖建男
研究生(外文):Jian-nan Liao
論文名稱:具多使用者干擾消除之非同步傳輸訊框展頻分碼多工系統
論文名稱(外文):An Asynchronous BS-CDMA System With Multiuser Interference Elimination
指導教授:張大中
指導教授(外文):Dah-chung Chang
學位類別:碩士
校院名稱:國立中央大學
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:2011
畢業學年度:99
語文別:中文
論文頁數:67
中文關鍵詞:非同步傳輸訊框展頻分碼多工系統
外文關鍵詞:BS-CDMA
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訊框展頻分碼多工在多使用者同時且同步傳收系統中,用以解決
傳統分碼多工系統無法克服的使用者間干擾與接收器硬體複雜度過
高的問題。在本篇論文,先對舊有的訊框展頻系統接收器做些微的修
正,再將主題延伸至現實情況中會遇到的多使用者同時但非同步傳輸
造成的多使用者間干擾,我們提出了三種方法來解決:第一種為展
頻、解展頻碼的設計,方法二為利用循環字首與字尾的插入,第三為
序列式多使用者間干擾消除法,這三種方法都能有完美消除干擾的能
力。另外,在頻域等化通道時須得知通道脈衝響應參數,故在最後我
們針對訊框展頻系統設計一個簡易通道估計法則。
Using mutually shift orthogonal spreading codes, block spread code
division multiple access (BS-CDMA) systems have been developed to
perform multiuser interference (MUI) free reception in order to reduce
the complexity of a receiver assuming the signals of all users arrive at the
base station synchronously.
In practice, imperfect synchronization destroys the orthogonality
among users and causes MUI. In this paper, we present three methods to
reduce the MUI due to quasi-synchronous reception. At first, we
introduce the design of spreading and despreading codes. Second one is
using cyclic prefix and cyclic suffix to maintain orthogonality of
spreading and dispreading codes. The last one is the successive MUI
cancellation (SMC) method. All of them can be shown to achieve the
performance close to that of a synchronous system, while maintaining a
low receiver complexity. In addition, we also explore a method to
estimate channel impulse response.
目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
圖目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
表目錄. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
第1 章序論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 前言. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 章節架構. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
第2 章BS-CDMA 系統架構. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 BS-CDMA 系統傳輸模型. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1.1 CP Part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1.2 ZP Part . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 BS-CDMA 系統接收模型. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.2.1 修正型循環通道矩陣拆解. . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2.2 循環位移正交碼消除MUI 干擾. . . . . . . . . . . . . . . . . . . . . . 13
2.2.3 單載波最小均方誤差頻域等化. . . . . . . . . . . . . . . . . . . . . . . 15
第3 章非同步傳輸BS-CDMA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.1 非同步傳輸之使用者間干擾. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.2 非同步傳輸BS-CDMA 系統模型. . . . . . . . . . . . . . . . . . . . . . . . 19
3.3 消除非同步傳輸之用戶間干擾. . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.3.1 方法一:展頻、解展頻碼設計. . . . . . . . . . . . . . . . . . . . . . . 27
3.3.2 方法二:循環字首、字尾的導入. . . . . . . . . . . . . . . . . . . . . 32
3.3.3 方法三:Successive MUI Cancellation . . . . . . . . . . . . . . . . . 36
3.3.4 三種方法用於BS-CDMA 之比較. . . . . . . . . . . . . . . . . . . . . 39
3.4 BS-CDMA 通道估計法則. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
第4 章系統模擬與結果分析. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.1 系統模擬參數與通道模型. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
4.2 模擬結果與討論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
第5 章結論. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
參考文獻. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
附錄A:展頻卅解展頻碼正交性證明. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
[1] F. Adachi, D. Garg, S. Takaoka, and K. Takeda, “Broadband CDMA techniques,” IEEE Wireless Communications, vol. 12,no. 2, pp. 8 – 18, April 2005.
[2] S. Zhou, G. Giannakis, and C. Le Martret, “Chip-interleaved block-spread code division multiple access,”IEEE Transactions on Communications, vol. 50, no. 2, pp. 235 – 248, Feb 2002.
[3] F. Petre, G. Leus, L. Deneire, M. Engels, M. Moonen, and H. D. Man, “Space-time block coding for single-carrier block transmission DS-CDMA downlink,”IEEE Journal on Selected Areas in Communications, vol. 21, no. 3, pp. 350 – 361, Apr 2003.
[4] K. Wavegedara, D. Djonin, and V. Bhargava, “Space-timecoded CDMA uplink transmission with MUI-free reception,”IEEE Transactions on Wireless Communications, vol. 4, no. 6, pp. 3095– 3105, Nov. 2005.
[5] S. Tomasin and F. Tosato, “Interference-Resilient Block-Spreading CDMA With Minimum-MAI Sequence Design,”IEEE
Transactions on Communications, vol. 55, no. 9, pp. 1783 – 1792,Sept. 2007.
[6] T. Dharma, A. Madhukumar, and A. Premkumar, “Layered -spacetime architecture for MIMO block spread CDMA systems,”IEEE Communications Letters, vol. 10, no. 2, pp. 70 – 72, Feb. 2006.
[7] X. Peng, A. Madhukumar, F. Chin, and T. Tjhung, “Block spreading CDMA system: a simplified scheme using despreading before equalisation for broadband uplink transmission,”IET Communications, vol. 3, no. 4, pp. 666 – 676, April 2009.
[8] J. Coon, “Precoded Block-Spread CDMA with Maximum User
Support and Frequency-Domain Equalization,”in 2007. ICC ''07.IEEE International Conference on Communications, June 2007, pp. 4082 – 4086.
[9] J. P.Coon, “Generalized precoded block-spread CDMA,”IEEE Transactions on Communications, vol. 57, no. 7, pp. 1919 – 1923, July 2009.
[10] X. Ma, C. Tepedelenlioglu, G. Giannakis, and S. Barbarossa,“Non-data-aided carrier offset estimators for OFDM with null subcarriers: identifiability, algorithms, and performance,”IEEE Journal on Selected Areas in Communications, vol. 19, no. 12, pp. 2504 – 2515, dec 2001.
[11] X. Tang and W. H. Mow, “Design of spreading codes for quasisynchronous CDMA with intercell interference,”IEEE Journal on Selected Areas in Communications, vol. 24, no. 1, pp. 84 – 93, Jan. 2006.
[12] Y. Wang and J. P. Coon, “MUI-Reducing Spreading Code Design for BS-CDMA in the Presence of Carrier Frequency Offset,”IEEE Transactions on Vehicular Technology, vol. 60, no. 6, pp. 2583 – 2593, july 2011.
[13] M. Bocus, Y. Wang, and J. Coon, “Linear Equalizers for Quasi-Synchronous Block Spreading CDMA Systems,”in 2009. GLOBECOM 2009. IEEE Global Telecommunications Conference, Dec. 2009, pp. 1 – 6.
[14] Y. Tang, B. Vucetic, and Y. Li, “An FFT-based multiuser detection for asynchronous block-spreading CDMA ultra wideband communication systems,”in 2005. ICC 2005. 2005 IEEE International Conference on Communications, vol. 5, May 2005, pp. 2872 – 2876.
[15] Y. Tang, Y. Li, and B. Vucetic, “A Double-Stage Multiuser Detector with FFT-Based Equalization for Asynchronous CDMA Ultra-Wideband Communication Systems,”IEEE Transactions onWireless Communications, vol. 5, no. 11, pp. 3266 – 3277, Nove 2006.
[16] Y. Wang and J. Coon, “Interference-Reducing Spreading Code Design for BS-CDMA with Quasi-Synchronous Reception,” in 2010 IEEE 72nd Vehicular Technology Conference Fall (VTC 2010- Fall), Sept. 2010, pp. 1 – 5.
[17] X. Peng, T. Dharma, F. Chin, and A. Madhukumar, “Novel interference cancellation methods for BS-CDMA in uplink broadband mobile communication systems,”IEEE Communications Letters, vol. 12, no. 8, pp. 560 – 562, Aug. 2008.
[18] H. Fu and S. Attallah, “Joint channel and carrier offset estimation in an asynchronous CDMA system,”in 2005. VTC 2005-Spring. 2005 IEEE 61st Vehicular Technology Conference, vol. 1, May-1 June 2005, pp. 500 – 504.
[19] L. Thiagarajan, S. Attallah, H. Fu, and Y.-C. Liang, “Non-Data-Aided Synchronization and Channel Estimation for Asynchronous CDMA Uplink,”in 2007. ICC ''07. IEEE International Conference on Communications, June 2007, pp. 2906 – 2911.
[20] S. Attallah, L. Thiagarajan, H. Fu, and Y.-C. Liang, “Joint Channel and Carrier Offset Estimation for Synchronous Uplink CDMA Systems,”IEEE Transactions on Vehicular Technology, vol. 56, no. 5, pp. 2769 – 2774, Sept. 2007.
[21] A. Molisch, J. Foerster, and M. Pendergrass, “Channel models for ultrawideband personal area networks,”IEEE Wireless Communications, vol. 10, no. 6, pp. 14 – 21, Dec. 2003.
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