基于可重构智能表面与人工噪声的空间调制安全传输方案
An anti-eavesdropping scheme for spatial modulation system based on reconfigurable intelligent surface and artificial noise
杨倩 1张杭丽 1奚唐敏1
作者信息
- 1. 浙江同济科技职业学院 建筑工程学院,浙江 杭州 310000
- 折叠
摘要
针对远场通信环境的不可控性和抗窃听能力不足,提出一种利用可重构智能表面重塑无线传播环境并通过人工噪声实现空间调制安全传输的方案.考虑到信道相位对信号质量的影响,调节可重构智能表面反射相位使得反射信号相位对齐,从而最大化接收空间调制索引天线的信噪比.全双工接收端在接收信息的同时发送映射在合法信道零空间上的人工噪声矢量干扰窃听者,基于中心极限定理和矩量母函数的近似方法,推导出系统保密速率和误码率的闭式表达式.在此基础上,以最大化保密速率为目标,对有用信息和人工噪声的功率分配进行优化.仿真结果表明,与传统空间调制系统相比,该方案在极低信噪比区域实现了高保密性能,配置可重构智能表面能够极大地改善远场的空间调制接收机的传输速率和误码率.
Abstract
For the uncontrollability and insufficient anti-eavesdropping ability in the far-field communication envi-ronment,a secure transmission scheme of spatial modulation system was proposed,which utilizes reconfigurable intel-ligent surface(RIS)to make the wireless environment programmable and artificial noise to improve the safety.First,considering the effect of channel phase randomness on signal quality,RIS reflection phase is adjusted to align the re-flected signal to maximize the SNR of the receiving spatially modulated index antenna.The full-duplex receiver simultaneously receives the information and sends the artificial noise vector jamming eavesdropper mapped on the null space of the legal channel.Then,based on the central limit theorem and the approximate method of the moment generating function,the closed form expressions of the system security rate and bit error rate are derived.On this ba-sis,the power distribution of useful information and artificial noise is optimized with the aim of maximizing the secur-ity rate.The results show that the system with proposed scheme achieves remarkably security performance in very low SNR region with data rate and bit error rate greatly improved by RIS.
关键词
空间调制/可重构智能表面/保密速率/人工噪声/抗窃听Key words
spatial modulation/reconfigurable intelligent surface/secure rate/artificial noise/anti-eavesdropping引用本文复制引用
基金项目
浙江同济科技职业学院一般科研项目(FRF23YB007)
出版年
2024
NETL
NSTL
万方数据