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姓名 吳佩芬(Pei-Fen Wu) 查詢紙本館藏 畢業系所 通訊工程學系 論文名稱 用於加成性高斯白雜訊通道的非同調渦輪解碼
(Noncoherent Turbo Decoding for the AWGN Channel)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 在1993年所提出的同調渦輪解碼，因其優異的錯誤效能受到高度的重視，在許多通訊協定中也被採用。另一方面，渦輪碼在加成性高斯白雜訊通道上的非同調最大後置機率解碼演算法已被提出，但其複雜度甚高，在本論文中，我們考慮渦輪碼在加成性高斯白雜訊通道上的非同調解碼，提出兩類作法。第一類作法是在接收端先用解調器計算對數可能性，再送入同調渦輪解碼器解碼。第二類作法是在每一次遞迴都估測通道相移，再將消除通道相移後的訊號送到同調解碼器做解碼。電腦模擬結果顯示第二類作法擁有不錯的效能。
摘要(英) Turbo code was proposed in 1993 and has raised great attention for its good effectiveness, and thus it has been used widely in many communication protocols. Otherwise, noncoherent maximum a posteriori decoding for the AWGN channel has been already proposed, and it is too complex. Therefore, in this thesis, we proposed two algorithms of noncoherent decoding to Turbo code for the AWGN channel. In order to fine tune the likelihoods to the Turbo decoding, the first algorithm re-computes the log-likelihood of transmitted bits in every iterative. The second algorithm re-estimates the phase shift in every iterative, and the signal which recovered phase sent to Turbo decoder. The positive results got from computer simulation showed that the second algorithms have good effectiveness.
關鍵字(中) ★ 渦輪碼
★ 非同調關鍵字(英) ★ Turbo code
★ Noncoherent論文目次 第一章 緒論
1.1 介紹 1
1.2 通道模型 2
第二章 相關文獻回顧
2.1 同調渦輪碼 3
2.2 空時渦輪碼 7
2.2.1 編碼 7
2.2.1 重複解調變/解碼 8
2.3 在AWGN通道的非同調重複渦輪解碼 11
2.3.1非同調BCJR演算法 11
2.3.2 非同調重複解碼 13
第三章 非同調渦輪重複解調變/解碼
3.1 解調器介紹 15
3.2 外質對數可能性 17
3.3 非同調窩重複解調變/解碼 18
3.4 模擬結果與討論 19
第四章 非同調渦輪重複估測/解碼
4.1 作法一 21
4.1.1傳送端介紹 21
4.1.2接收端介紹 22
4.2 作法一模擬結果討論 26
4.3 作法二 30
4.4 模擬結果與討論 33
第五章 結論 38
參考文獻
中英對照表
參考文獻 【1】 C. Berrou and A. Glavieux, “Near optimum error correcting coding and decoding: turbo-codes,” IEEE Trans. Commun., vol. 44, pp. 1261-1271, Oct. 1996.
【2】 S. Benedetto and G. Montorsi, “Unveiling turbo-codes: Some results on parallel concatenated coding schemes,” IEEE Trans. Inform. Theory, vol. 42, no. 2, pp. 409-428, Mar. 1996.
【3】 J.B. Cain, G.C. Clark and J.M. Geist , “Punctured convolutional codes of rate (n-1)/n and simplified maximum likelihood decoding,” IEEE Trans. Inform. Theory, vol.IT-25, pp. 97-100, Jan. 1979.
【4】 I. Bahceci and T.M. Duman, “Combined turbo coding and unitary space-time modulation,” IEEE Trans. Commun., vol. 50, pp. 1244-1249, Aug. 2002.
【5】 A. Krishnamoorthy and A. Anastasopoulos, “Code and receiver design for the noncoherent fast-fading channel,” IEEE J. Select. Areas Commun., vol. 23, pp. 1769-1778, Sept. 2005
【6】 A. Stefanov and T.M. Duman, “Turbo-coded modulation for systems with transmit and receive antenna diversity over block fading channels: System model, decoding approaches, and practical considerations,” IEEE J. Select. Areas Commun., vol. 19. pp. 958-968, May 2001.
【7】 D. Divsalar and M.K. Simon, “Multiple-symbol differential detection of MPSK,” IEEE Trans. Commun., vol. 38, pp. 300-308, Mar. 1990.
【8】 G. Colavolpe, G. Ferrari, and R. Raheli, "Noncoherent iterative (turbo) decoding," IEEE Trans. Commun., vol. 48, no. 9, pp. 1488-1498, 2000.
【9】 G. Colavolpe and R. Raheli, “Noncoherent sequence detection,” IEEE Trans. Commun., vol. 47, pp. 1376-1385, Sept. 1999.
【10】 D. Raphaeli, ”Noncoherent coded modulation,” IEEE Trans. Commun., vol. 44, pp. 172-183, Feb. 1996.
【11】 D. Divsalar et al., "Maximum-likelihood differential detection of uncoded and trellis coded amplitude phase modulation over AWGN and fading channels-metrics and performance," IEEE Trans. Commun., vol. 42, No. 1, pp. 76-89, Jan. 1994
指導教授 魏瑞益(Ruey-Yi Wei) 審核日期 2009-7-18 推文 plurk
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