主动自加噪与高效纠错编码结合的物理层安全传输

摘要

针对物理层数据的安全传输问题，提出了一种通信发送方主动自加噪与高效信道纠错编码相结合的安全传输方法。该方法在发射过程中主动在信号中添加噪声，以实现对任何接收端的比特信噪比上限的精确控制，在此基础上利用通信侦听方在高误码率条件下无法准确推断信道编码类型与编码参数的缺陷，有效阻止非合作通信侦听方对物理层准确码流的获取，而合作通信接收端则可以通过高效的信道纠错译码来消除被发送端添加到信号中的噪声所带来的影响。相关的理论分析与仿真示例显示，本方法具有有效性，为通信系统物理层数据安全传输新方法研究提供了重要参考。%Aiming at the problem of physical-layer safe transmission, a new safe transmission method in combination of active self-added noise and efficient error-correct encode is proposed. This method, via actively adding noise to the signal during the transmitting process, implements exact control of the upper limit of bit SNR for any receivers. In light of that the interceptor cannot get the type and parameters of channel code in the high bit-error-rate, the communication reconnaissance is prevented from getting the accurate bit stream of the physical layer. For the normal receiver, the noise added in the signals could be eliminated and the bit streams are recovered correctly via the channel decoding process. The theoretic analysis and simulation examples indicate the validity of this method, thus providing a significant reference for the research of physical-layer safe transmission application.