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| Optimization of Construction and Encoding for Finite Length Irregular LDPC Codes |
| Hu Jun-feng①②; Zhang Hai-lin① |
①State Key Laboratory of Integrate Services Network, Xidian University, Xi’an 710071, China;
②CETC No. 20 Research Institute, Xi’an 710068, China |
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Abstract The main influence for the performance of finite length Low-Density Parity-Check(LDPC) codes is analyzed. According to optimum choice for degree distribution, a check matrix is constructed with improved Progressive-Edge-Growth (PEG) algorithm. A practical efficient encoding algorithm is proposed to optimize the check matrix. A finite length irregular LDPC code with low error-floor performance and approximate linear encoding complexity is obtained. This optimization method can be easily extended to general communication channels.
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Received: 11 August 2006
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2008, Vol. 30 
