Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/7557
標題: 採用渦輪等化器技術的正交分頻多工-分碼多工系統
TURBO EQUALIZATION FOR OFDM-CDMA COMMUNICATION SYSTEMS
作者: 朱偉銘
Chu, Wei-Ming
關鍵字: LMS
最小均方演算法
TURBO CODE
SOVA
MC-CDMA
TURBO EQUALIZATION
渦輪碼
軟式輸出威特比演算法
多載波分碼多工多使用者存取
渦輪等化器
出版社: 電機工程學系所
引用: [1] N. Wiberg, “Codes and decoding on general graphs,” PhD thesis, Linkoping University, 1996. [2] C. Douillard, M. Jezequel, C. Berrou, A. Picart, P. Didier, and A. Glavieux, “Iterative correction of intersymbol interference: Turbo equalization,” European Trans. on Telecomm., vol. 6, pp. 507—511, Sep-Oct 1995. [3] X. Wang and H. Poor, “Iterative (turbo) soft interference cancellation and decoding for coded CDMA,” IEEE Trans. on Comm., vol. 47, no. 7, pp. 1046—1061, 1999. [4] C. Douillard, M. Jezequel, C. Berrou, A. Picart, P. Didier, and A. Glavieux, “Iterative correction of intersymbol interference: Turbo equalization,”European Trans. on Telecomm., vol. 6, pp. 507—511, Sep-Oct 1995. [5] G. Bauch and V. Franz, “A comparison of soft-in/soft-out algorithms for Turbo detection,” in Proc. Intern. Conf. on Telecomm., pp. 259—263, June 1998. [6] A. Anastasopoulos and K. Chugg, “Iterative equalization/ decoding for TCM for frequency-selective fading channels,” in Conf. Record 31th Asilomar Conf. on Signals, Systems & Comp., vol. 1, pp. 177—181, Nov 1997. [7] M. Tuchler, R. Koetter, and A. Singer, “Turbo equalization: principles and new results,” IEEE Trans. on Comm., vol. 50, pp. 754—767, May 2002. [8] A. Glavieux, C. Laot, and J. Labat, “Turbo equalization over a frequency selective channel,” in Proc. of the Intern. Symposium on Turbo codes, Brest, France, pp. 96—102, September 1997. [9] J. Proakis and M. Salehi, “Communication Systems Engineering. Upper Saddle River,” New Jersey: Prentice Hall, 1994. [10] J.Magenaur and P.Hoehr, “A Viterbi Algorithm with soft - decision outputs and it's applications,” Proc. Of IEEE Globecom'89, Dallas, Texas,pp. 47.1 1-47.17,1989. [11] J.G.Proakis, "Digital Communications", 3rd edition, McGraw-Hill, 1995. [12] S. Hara, “Verview of Multicarrier CDMA,” IEEE Commun. Mag., pp. 126-133, Dec.1997. [13] L.HANZO,T.H.LIEW,B.L.YEAP, “Turbo Coding, Turbo Equalisation and Space-Time Coding for Transmission over Fading Channels.”
摘要: 渦輪碼(Turbo code)提供在較低的雜訊比(SNR)下有低的位元錯誤率 (BER),我們提供兩種渦輪等化器在多載波分碼多工多使用者存取 (MC-CDMA) 在最小均方演算法(LMS) 下沒有使用訓練序列(train sequence)。期望訊號(desired signal)使用在更新方程式(update equation)產生下靠直接決策(decision-directed )演算法在展頻端的輸出,這是一種直觀的方法。然而,更新方程式跟渦輪解碼是個別獨立,在一般性中,渦輪解碼器可以得到更可靠的結果,所以我們提出第二個架構。結合等化器跟渦輪解碼,將額外的資訊迴授到渦輪的解碼器中當作期望訊號。
Turbo code offer very low BER under lower SNR. We propose two turbo equalization scheme for MC-CDMA based on LMS algrithm without training sequence. The desired signal used in the updated equation is produced by decision-directed algorlthm in despreader output ,this is a intuitive method. However, its updated equation is independent with turbo decoding. In general , the turbo decoder can obtain more reliable result, so we propose the secondscheme to combine the equalization and turbo decoding the extrinsic information of turbo decoder is feed back to use for the desired signal。
URI: http://hdl.handle.net/11455/7557
其他識別: U0005-2007200715520500
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-2007200715520500
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