基于EXIT图的连续变量密钥分发数据协调优化

在量子密码通信中,未优化的低密度奇偶校验(LDPC)码的度分布性能较差,得到的协调效率较低,且传输距离较短。针对上述问题,提出一种基于连续变量的量子密钥分发数据协调算法。利用外信息转移图分析特点,从基于粒子群的高斯近似算法得到的度分布中,通过比较门限值大小筛选出性能更好的度分布,进而优化低密度奇偶校验码。仿真结果表明,与密度进化算法和高斯近似算法相比,外信息转移图可以有效地优化LDPC码度分布,同时,当连续变量分组数为2×105时,与未优化的LDPC码相比,优化的LDPC码能降低收敛信噪比,提高协调效率,延长传输距离。...

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Bibliographic Details
Published in计算机工程 Vol. 42; no. 6; pp. 156 - 160
Main Author 王晓凯 孙艺 郭大波 王云艳
Format Journal Article
LanguageChinese
Published 山西大学物理电子工程学院,太原,030006 2016
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ISSN1000-3428
DOI10.3969/j.issn.1000-3428.2016.06.027

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Summary:在量子密码通信中,未优化的低密度奇偶校验(LDPC)码的度分布性能较差,得到的协调效率较低,且传输距离较短。针对上述问题,提出一种基于连续变量的量子密钥分发数据协调算法。利用外信息转移图分析特点,从基于粒子群的高斯近似算法得到的度分布中,通过比较门限值大小筛选出性能更好的度分布,进而优化低密度奇偶校验码。仿真结果表明,与密度进化算法和高斯近似算法相比,外信息转移图可以有效地优化LDPC码度分布,同时,当连续变量分组数为2×105时,与未优化的LDPC码相比,优化的LDPC码能降低收敛信噪比,提高协调效率,延长传输距离。
Bibliography:31-1289/TP
Low Density Parity Check(LDPC) code;continuous variable;data coordination;Extrinsic Information Transfer(EXIT);threshold value
WANG Xiaokai,SUN Yi,GUO Dabo,WANG Yunyan(College of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,China)
In quantum cryptography communication,distributions of the non optimized Low Density Parity Check(LDPC) has low performance and it has low reconciliation efficiency and short transmission distance.Aiming at this problem,a quantum key distribution data coordination algorithm based on continuous variables is proposed.Take the advantage of characteristics of Extrinsic Information Transfer(EXIT) chart,from the results of Guassian approximation based on Particle Swarm Optimization(PSO),EXIT chart selects better performance distributions by comparing the threshold value and optimize LDPC code.Simulation results show that,compared with the density evolution algorithm and the Gauss approximation algorithm,the LDPC code distribution can be optimized effectively
ISSN:1000-3428
DOI:10.3969/j.issn.1000-3428.2016.06.027