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Key Distribution Data Coordination Optimization with Continuous Variables Based on EXIT Chart

WANG Xiaokai,SUN Yi,GUO Dabo,WANG Yunyan   

  1. (College of Physics and Electronic Engineering,Shanxi University,Taiyuan 030006,China)
  • Received:2015-06-08 Online:2016-06-15 Published:2016-06-15

基于EXIT图的连续变量密钥分发数据协调优化

王晓凯,孙艺,郭大波,王云艳   

  1. (山西大学 物理电子工程学院,太原 030006)
  • 作者简介:王晓凯(1963-),男,教授、博士,主研方向为信息安全、人工智能;孙艺,硕士研究生;郭大波,副教授、博士;王云艳,硕士研究生。
  • 基金资助:
    山西省国际科技合作计划基金资助项目(2014081027-1);山西省基础研究计划基金资助项目(2014011007-2);山西省回国留学人员科研基金资助项目(2014-012)。

Abstract: 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 by EXIT chart.Meanwhile,when the number of packets of continuous variables is 2×105,compared with of the non optimized LDPC codes,the optimized LDPC codes can reduce the convergence Signal to Noise Ratio(SNR) and improve the reconciliation efficiency and maximum transmission distance.

Key words: Low Density Parity Check(LDPC) code, continuous variable, data coordination, Extrinsic Information Transfer(EXIT), threshold value

摘要: 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。

关键词: 低密度奇偶校验码, 连续变量, 数据协调, 外信息转移, 门限值

CLC Number: