不規(guī)則LDPC碼的密度進(jìn)化方法及其門限值確定
Density Evolution Method and Threshold Decision for Irregular LDPC Codes
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摘要: 該文針對不規(guī)則LDPC碼闡述密度進(jìn)化原理，比較分析了具體算法的特點(diǎn)與應(yīng)用。對離散密度進(jìn)化和高斯近似算法進(jìn)行了仿真分析，尋找到一些好的分布對。這對促進(jìn)LDPC碼以及其它現(xiàn)代高效糾錯碼的理論分析和應(yīng)用研究具有重要指導(dǎo)意義。
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關(guān)鍵詞:
- 不規(guī)則LDPC碼; 密度進(jìn)化方法; 門限值; 高斯近似
Abstract: In this paper, the principle of density evolution combined with decoding process is explained firstly. Two algorithms discretized density evolution and Gaussian approximation to program the evolution proceeding are discussed. Simulation results of some good distribution pairs that are found are presented as well. -
Chung S Y, Forney J G D, Richardson T, Urbanke R. On the design of low-density parity-check codes within 0.0045 dB of the Shannon limit. IEEE Commun. Lett., 2001, 5(2): 58 - 60.[2]Richardson T, Urbanke R. The capacity of low-density paritycheck codes under message-passing decoding[J].IEEE Trans. on Info. Theory.2000, 47(2):599-[3]Richardson T, Shokrollahi A, Urbanke R. Design of capacityapproaching low-density parity-check codes[J].IEEE Trans. on Info.Theory.2001, 47(2):619-[4]Chung S Y, Urbanke R, Richardson T. Gaussian approaximation for sum-product decoding of low-density parity-check codes. In Proc. Int. Symp. Info. Theory, Sorrento, Italy, Jun, 2000:318. -
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