计算机应用 ›› 2010, Vol. 30 ›› Issue (2): 292-294.
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毛倩1,董德存2,曾小清2
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摘要： 提出了一种加性高斯噪声（AWGN）信道下非规则低密度奇偶校验（LDPC）码的优化方法。利用LDPC码迭代译码算法下变量节点与校验节点的EXIT曲线之间的面积反映码的收敛阈值与香农限的差距这一特点，设计表示两条EXIT曲线之间面积的函数F，该函数可以衡量非规则LDPC码的性能，F值越小，LDPC码的收敛阈值就越接近香农限。仿真显示，合理设计变量节点和校验节点，减小函数F的值，能够提高非规则LDPC码的性能。
关键词: 低密度奇偶校验码, 外部信息转换（EXIT）图, 加性高斯白噪声, 迭代译码, 收敛阈值
Abstract: A method to optimize irregular Low-Density-Parity-Check (LDPC) codes was proposed. The area gap between the EXIT curves of variable-node decoder and check-nodes decoder of a LDPC code reflects a rate loss compared to Shannon limit, a function F which computed the area gap was designed to evaluate the performance of the irregular LDPC codes. The lower the value F is, the smaller the gap between the convergence threshold and the Shannon limit is. Simulation shows that the performance of irregular LDPC codes will be improved by designing variable-node decoder and check-nodes decoder appropriately and reducing F.
Key words: Low-Density-Parity-Check (LDPC) code, EXtrinsic Information Transfer (EXIT) chart, Additive White Gaussian Noise (AWGN), iterative decoding, convergence threshold
毛倩 董德存 曾小清. 一种AWGN信道下非规则LDPC码的优化方法[J]. 计算机应用, 2010, 30(2): 292-294.
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