博碩士論文 975203009 詳細資訊




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姓名 謝旻倫(Min-lun Hsieh)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 用於相位不確定性通道的非同調渦輪解碼
(Noncoherent Turbo Decoding for the Phase-Uncertain Channel)
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摘要(中) 在1993年所提出的同調渦輪碼,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。許多實際的帶通通信系統中,在資料可以被解碼之前,估計出載波相位是困難的。許多強大的演算法基於合併檢測和解碼策略已經被提出。本篇論文提出使用原始籬柵的改良式演算法,由模擬結果顯示在高訊雜比的情況之下,我們所提出的作法能有較佳的位元錯誤率。此外,本篇論文在渦輪編碼器前串接差分編碼器去避免非同調災難碼的產生。
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. In many practical bandpass communication systems, it is difficult that the carrier phase needs to be estimated before the data can be decoded. Some powerful algorithms based on combined detection and decoding strategy has been proposed. In this thesis, we propose a modified algorithm using the original trellis. The simulation result shows that at high SNR, the proposed approach has better bit error rate. In addition, we concatenate a differential encoder with a turbo encoder to avoid noncoherent catastrophic codes.
關鍵字(中) ★ 差分編碼器
★ 非同調檢測
★ 渦輪碼
★ 非同調災難碼
關鍵字(英) ★ turbo code
★ differential encoder
★ noncoherent catastrophic code
★ noncoherent detection
論文目次 摘要 ······································································· I
Abstract ··································································II
誌謝 ·····································································III
目錄 ····································································· V
圖目錄 ································································ VII
第一章 緒論 ························································ 1
1.1 介紹 ···································································· 1
1.2 研究動機 ······························································ 1
1.3 通道模型 ······························································ 2
第二章 相關文獻回顧 ············································ 4
2.1 同調渦輪碼 ··························································· 4
2.1.1 編碼器 ····································································· 4
2.1.2 解碼器 ····································································· 6
2.2 同調渦輪籬柵型編碼調變 ········································· 8
2.2.1 編碼器 ····································································· 8
2.2.2 解碼器 ···································································· 11
2.3 在AWGN通道的非同調重複渦輪解碼 ······················ 14
2.3.1 非同調BCJR演算法 ··················································15
2.3.2 非同調重複解碼 ························································17
2.4 用於相位不確定性通道的適應性重複檢測 ·················· 19
2.4.1 系統與通道模型 ························································19
2.4.2 用於相位不確定性通道的檢測策略 ································20
第三章 使用原始籬柵之改良式演算法 ······················27
3.1 第Ⅰ種 ······························································· 28
3.2 第Ⅱ種 ······························································· 30
3.3 第Ⅲ種 ······························································· 35
第四章 串接相差編碼器 ········································40
4.1 非同調災難碼 ······················································ 40
4.2 串接差分編碼器 ··················································· 42
第五章 結論 ·······················································51
參考文獻 ·······························································52
參考文獻 [1]C. Berrou and A. Glavieux, “Near optimum error correcting coding and decoding: turbo-codes,” IEEE Trans. Commum., vol. 44, Oct. 1996, pp. 1261-1271.
[2]S. Benedetto and G. Montorsi, “Unveiling turbo-codes: some results on parallel concatenated coding schemes,” IEEE Trans. Inform. Theory, vol. 42, no. 2, Mar. 1996, pp. 409-428.
[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, Jan. 1979, pp. 97-100.
[4]P. Robertson and T. Worz, “Bandwidth-efficient turbo trellis-coded modulation using punctured component codes,” IEEE J. Select. Areas Commun., vol. 16, no. 2, Feb. 1998, pp. 206-218.
[5]G. Ungerboeck, “Channel coding with multilevel/phase signals,” IEEE Trans. Inform. Theory, vol. IT-28, Jan. 1982, pp. 55-56.
[6]Divsalar and M. K. Simon, “Multiple-symbol differential detection of MPSK,” IEEE Trans. Commun., vol. 38, pp. 300-308, Mar 1990.
[7]G. Colavolpe, G. Ferrari, and R. Raheli, “Noncoherent iterative (turbo) decoding,” IEEE Trans. Commun., vol.48, no. 9, pp. 1488-1498, 2000.
[8]G. Ferrari, A. Anastasopoulos, G. Colavolpe and R. Raheli, “Adaptive iterative detection for the phase-uncertain channel: limited-tree-detection versus truncated-memory detection,” IEEE Trans. Veh. Technol., vol. 53, no.2, Mar. 2004, pp. 433-442.
[9]Anastasopoulos and K. M. Chugg, “Adaptive iterative detection for phase tracking in turbo-coded systems,” IEEE Trans. Commun., vol. 49, no. 12, Dec. 2001, pp. 2135-2144.
[10]G. Colavolpe and R. Raheli, “Noncoherent sequence detection,” IEEE Trans. Commun., vol. 47, Sept. 1999, pp. 1376-1385.
指導教授 魏瑞益(Ruey-yi Wei) 審核日期 2010-7-26
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