基于无线信道特征的密钥协商方案设计

摘要

Aiming at the problem that the realistic channel consistency of key extraction based on wireless channel-characteristics is not complete,the method to correct inconsistent Byte using adaptive low density parity check code was proposed.The statisti-cal channel characteristics and the channel characteristics in key agreement were measured.The initial error rate was evaluated. The code rate was chosen based on the initial error rate.The simulation results show that,in the case of almost the same para-meters,the adaptive LDPC can get higher success rate and higher agreement efficiency.%针对基于无线信道特征的密钥提取技术中获得的信道特征不完全一致的问题,提出一种自适应的低密度奇偶校验码(low density parity check code,LDPC)纠正通信双方密钥不一致位的方案。测量无线信道的统计信道特征,对比密钥协商中的信道特征与统计信道特征,估计信道特征的初始错误率,根据初始错误率的不同自适应地选择 LPDC 码的码率,可以利用统计信道特征提前对信道特征初始错误率做出判断,确定 LDPC码的码率。仿真结果表明,在各个参数基本相同的情况下,使用自适应的 LDPC方案可以获得更高的纠错成功率和协商效率。