智能超表面赋能的发射源位置隐私保护

RIS-enabled Privacy Protection of Emitter Location

由于无线通信的开放性及无线信号传输的辐射性,位于信号接收范围内的非法窃听者有机会截获通信信号,获取通信信号的关键特征,甚至破译传输内容,这给无线通信安全带来了严重威胁。得益于密码学的发展,完全破译传输内容可能性较小,无线通信面临的主要威胁来自发射源位置等关键特征的暴露。考虑通信发射源位置隐私保护问题,借助分布式RIS反射真实发射源信号,构建“虚假发射源”,降低窃听者对通信发射源的测向精度,实现对真实发射源位置信息的保护。基于窃听者对通信发射源的测向误差的CRLB,构建发射源位置隐私保护的性能评估指标。结果表明RIS的部署能够有效提升对真实发射源位置隐私保护性能,且分布式RIS布阵相较于集中式RIS布阵方案来说,性能提升更为显著。另外,发射源位置隐私保护性能受限于窃听者天线数量,在天线数量增加时需要部署更多的RIS才能达到相同的位置隐私保护效果。

Due to the openness of wireless channels and the radiation of wireless signals,unauthorized eavesdroppers in the signal reception range can intercept communication signals,capture critical signal features,and even decrypt transmitted content,posing a severe threat to wireless communication security.Although the development of cryptography has reduced the risk of complete content decryption,the primary concern in wireless communication remains the exposure of key features,such as the emiter location,To address the privacy protection of emtter location,we propose a method that utilizes distributed reconfigurable intelligent surfaces(RIS)to reflect true signals,creating a"fake emitter."This approach reduces the eavesdroppers'accuracy in estimating the emitter location,ensuring the security of the true emitter location.We establish an evaluation metric for the privacy protection of the emitter location based on the CRLB of the eavesdroppers'estimation error in the emitter location.The results demonstrate that the RIS deployment effectively enhances the performance of privacy protection for the genuine emitter location.In particular,a distributed RIS deployment outperforms centralized schemes,resulting in more significant performance improvements.Additionally,the level of privacy protection for emitter location depends on the number of antennas used by eavesdroppers.As the number of antennas increases,deploying more RIS units becomes necessary to achieve the same level of protection.