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Volume 30 Issue 11
Jan.  2011
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Li Er-Bao, Lei Jing, Xu Fu-Bing. Design and Optimization of Degree Distributions of Irregular LDPC[J]. Journal of Electronics & Information Technology, 2008, 30(11): 2788-2791. doi: 10.3724/SP.J.1146.2007.00799
Citation: Li Er-Bao, Lei Jing, Xu Fu-Bing. Design and Optimization of Degree Distributions of Irregular LDPC[J]. Journal of Electronics & Information Technology, 2008, 30(11): 2788-2791. doi: 10.3724/SP.J.1146.2007.00799

Design and Optimization of Degree Distributions of Irregular LDPC

doi: 10.3724/SP.J.1146.2007.00799
  • Received Date: 2007-05-28
  • Rev Recd Date: 2007-11-06
  • Publish Date: 2008-11-19
  • Good degree distributions can improve the error-floor and reduce the complication in encoding and decoding of LDPC. Under AWGN channel, Gaussian approximation algorithm can analyze the decoding threshold of LDPC presented by their degree distributions. Using differential evolution, the degree distributions that possess maximal threshold can be gotten. Through simulation results, the optimized degree distributions which possess a 0.15dB better noisy threshold than using linear algorithm.
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  • [1] Gallager R G. Low-Density Parity-Check Codes [D]. [Ph. D.dissertation], Cambridge, MA: MIT Press, 1963. [2] Luby M. Analysis of low density codes and improved designsusing irregular graphs[C]. In proc .3oth. Annu. ACM symp.Theory of Computing, 1998: 249-258. [3] Richardson T, Shokrollahi A, and Urabanke R, Design ofcapacity-approaching irregular low-density parity-checkcodes [J]. IEEE Trans[J].on Inform. Theory.2001, 47(2):619-637 [4] Chung S Y, Richardson T J, and Urbanke R L. Analysis ofsum-product decoding of low-density parity-check codesusing a Gaussian approximation[J]. IEEE Trans. on Inform.Theory, 2001(47), (2): 657-670. [5] Di Changyan, Richardson T, and Urabanke R. Weightdistribution of Low Density Parity Check Codes[J].IEEETrans. on Inform. Theory.2006, 52(11):4839-4855 [6] Price K and Storm R. Differential evolution A simpleand efficient adapive scheme for global optimization overcontinuous spaces[J].J. Global Optimiz.1997, 11:341-359 [7] 肖娟, 王琳, 邓礼钊. 不规则LDPC 码的密度进化方法及其门限值确定 [J].电子与信息学报.2005, 27(4):617-619浏览
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