一种改进的防窃听LT码

An Improved LT Codes in Anti-Eavesdropping Method

为了进一步提高LT(Luby transform)码的防窃听能力,提出将部分编码矩阵列依据度的大小由高到低重新排列,推迟发送度1符号,以延迟译码开始时间,阻止信息被窃听。实验结果表明,与传统的LT码相比,改进的LT码作为信道编码在保证接收者恢复信源信息的同时,迫使窃听者的误码率大幅度增加,当窃听信道删除概率高于主信道时候,误码率增幅更为明显。

In order to improve the anti-eavesdropping ability of LT(Luby transform)codes,this paper proposes the method that the part of the columns in the coding matrix is re-arranged from high to low according to the degree of LT codes,to delay the start time of decoding by delaying the symbols of degree 1.And the aim of preventing eavesdropping is realized.Experimental results show that compared with LT codes,the improved LT codes as channel codes force the eavesdroppers BER to increase greatly while guaranteeing the receiver to recover the source information,and the bit error rate increases more obviously when the deletion probability of the eavesdropping channel is higher than that of the main channel.