基於長期演進技術下渦輪碼解碼器之研究

在本論文中，我們探討在長期演進技術(Long Term Evolution - LTE)系統下之渦輪碼，經過白高斯雜訊(AWGN)通道與衰退通道(Fading Channel)後，利用MAP(Maximum A Posteriori Probability)、Max-Log MAP、Log MAP三種演算法進行解碼。系統架構套用第三代合作夥伴計畫(3GPP TS 36.212 V9.2.0)內的規範，在經過通道(Channel)效應後，最大事後機率(MAP)與Log MAP演算法有較小的誤碼率(Bit Error Rate)；而相對的Max-Log MAP演算法雖然誤碼率較高，卻有較低的運算複雜度(Complexity)，適合用於硬體實現。論文內將探討訊號訊雜比(SNR)的估測對渦輪碼解碼之影響，並且討論在衰退通道(Fading Channel)當中衰退振幅(fading amplitude)的估測所造成的系統解碼正確與否。

關鍵字

最大事後機率；訊雜比；運算複雜度；衰退通道；長期演進技術；高斯白雜訊通道；渦輪碼

並列摘要

In this paper, we study a turbo code decoder for 3GPP Long Term Evolution (LTE) system. We use Maximum A Posteriori Probability (MAP), Log-MAP and MAX-Log-MAP algorithm for turbo code decoding, under AWGN channel and fading channel. After channel decoding, we realize that MAP and Log-MAP has the same performance better than Max-Log-MAP, but Max-Log-MAP algorithm reduce more complexity than MAP and Log-MAP algorithm. If turbo code decoding cannot get SNR information, we use SNR estimation to solve SNR unknown. Furthermore, we consider if fading amplitude unknown, what situation will occur under fading channel.

並列關鍵字

Maximum A Posteriori Probability ； fading channel ； SNR ； AWGN ； complexity ； Turbo code ； 3GG Long Term Evolution

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] J.P. Woodard and L. Hanzo, "Comparative study of turbo decoding techniques: an overview," Vehicular Technology, IEEE Trans. on Vol. 49, Issue 6, Nov. 2000 pp.2208 – 2233.

[3] J. Hagenauer, E. Offer, and L. Papke, “Iterative Decoding of Binary Block and Convolutional Codes,” IEEE Information Theory, pp. 429-445, March 1996.

[4] Sorin Adrian Barbulescu, "Iterative decoding of turbo code and other concatenate codes," Electronic Engineering Faculty of Engineering University of South Australia, Feb. 1996

[5] J. Hagenauer, P. Robertson, and L. Papke, “Iterative decoding of systematic convolutional codes with the MAP and SOVA algorithms” in Proc. ITG’94, 1994

國際替代計量

基於長期演進技術下渦輪碼解碼器之研究

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