基于卫星通信系统的多元RC-LDPC信息安全传输算法

Non-binary RC-LDPC Information Security Transmission Algorithm Based on Satellite Communication System

基于卫星通信的信息传输极易通过无线信道被非法接收,导致信息泄露,因此本文在现有物理层安全研究的基础上,提出一种多元速率兼容低密度奇偶校验(rate compatible low density parity check,RC-LDPC)码的星地信道编码方法,并应用在自适应调制编码(adaptive modulation coding,AMC)系统上.利用信道状态信息将私密信息隐藏在删除位置,通过缩小安全间隙,提高合法接收误码曲线的下降速率,保证信息的安全性.利用NI USRP与LabVIEW搭建的平台对本文提出的算法进行仿真分析,结果表明,算法能够保证接收端正确接收,窃听端误码率达0.5左右,保证了信息安全传输.

It is easy for signal transmission based on satellite communication to be received illegally through wireless channels,leading to information leakage.Therefore,we propose a non-binary RC-LDPC(rate compatible low density parity check)encoding method for satellite channel based on the existing physical layer security research,and apply the method to the AMC system.The algorithm uses channel state information to secrete the private information in the deleted position.By narrowing the gap of safety,the proposed method elevates the drop rate of error curve of the legal receiver to ensure information security.The algorithm was simulated and analyzed based on NI USRP and LabVIEW.The simulation results show that the proposed algorithm can guarantee the receiver to receive correctly and the bit error rate of eavesdropper up to about 0.5,ensuring the safe transmission of information.