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| Design and Optimization of Degree Distributions of Irregular LDPC |
| Li Er-bao① Lei Jing① Xu Fu-bing①② |
| ①(School of Electronics Science and Engineering, National University of Defense Technology, Changsha 410073, China) ②(Unit 91269 of the PLA Navy ) |
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Abstract 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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Received: 28 May 2007
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Corresponding Authors:
Li Er-bao
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2008, Vol. 30 
