一种RB-HARQ辅助下基于非规则LDPC码的安全传输方案  

Reliability-based HARQ assisted irregular LDPC code in secure transmission

作　　者：王雷 丁晓晖 Wang Lei;Ding Xiaohui(School of Communications and Engineering,The Army Engineering University of PLA,Nanjing 210001,China;Support Team of Navigation and Communication for Second Information and Communication Brigade of Air Force,Nanjing 210003,China)

机构地区：[1]陆军工程大学通信工程学院,江苏南京210001 [2]空军信息通信第二旅导航通信技术保障队,江苏南京210003

出　　处：《信息技术与网络安全》2018年第11期74-78,共5页Information Technology and Network Security

摘　　要：提出了一种利用非规则LDPC码字与基于可靠度的混合自动重传技术(Reliability-Based Hybrid ARQ,RB-HARQ)相结合来实现安全传输的改进方案。在RB-HARQ技术中,接收端将译码后得到的后验概率对数似然比作为码字比特的可靠度信息,并按照绝对值大小进行排列,之后将可靠度最低的比特位置反馈给发送端请求重传。为了有效减少信息泄露,该方案利用了不同的信息加扰技术,同时结合非规则LDPC码字的不均等错误保护特性,可以进一步提高传输的可靠性。与基于规则LDPC码的RB-HARQ方案相比,该方案使系统中合法用户的误比特率和安全可靠区间指标得到明显改善,提高了安全传输性能。This paper proposes an improved scheme that combines irregular LDPC codes with reliability-based HARQ （RB-HARQ） to achieve secure transmission.In the RB-HARQ,the posteriori probability log-likelihood ratio obtained by decoding at the receiver is considered as the reliability information of the coded bits.The receiver arranges the reliability information according to the absolute value,and then feed back the bits′ position with the lowest reliability to the sender for requesting retransmission.In order to effectively reduce information leakage,the scheme utilizes different information scrambling techniques,and cooperates with the unequal error protection characteristics of irregular LDPC codes to further improve the reliability of transmission.Compared with the RB-HARQ scheme based on the regular LDPC code,this scheme improves the bit error rate and the security and reliability interval which are indicators of legitimate users in this system,and improves the security transmission performance.

关 键 词：LDPC码 混合自动重传 安全传输 可靠性 

分 类 号：TP918.91[自动化与计算机技术]