智能反射面实现空间调制的安全系统性能分析

为了解决安全空间调制系统中合法信道增益差的问题，提出了一种用智能反射面(Intelligent Reflective Surface,IRS)实现空间调制的物理层安全传输方案。IRS接收到发射端发射的幅相调制信号后，通过选择不同的IRS反射元件序号对空域部分信息进行映射，再将信号反射到接收端，以增大窃听端获取完整信息的难度。此外，在发射端采用波束赋形和天线分集技术，提高了系统有效性和可靠性。对系统的保密速率和误比特率进行的理论分析和仿真实验结果表明，所提方案不仅可以提高系统保密速率，还可以降低合法接收端的误比特率。

Performance analysis of security system for spatial modulation with intelligent reflective surface

In order to solve the problem of poor gain of legal channel in a secure space modulation system,a physical layer secure transmission scheme of space modulation with Intelligent Reflective Surface (IRS) is proposed.After receiving the amplitude modulation phase signal sent by the transmitter,IRS maps the spatial information to the signal by choosing different IRS reflector serial numbers,and then the signal is reflected to the receiving end so as to increase the difficulty of acquiring complete information at the eavesdropping end.In addition,beamforming and antenna diversity techniques are used at the transmitter to improve the effectiveness and reliability of the system.The security rate and bit error rate(BER) of the system are theoretically analyzed and simulated.The simulation results show that the proposed scheme can not only improve the security rate of the system but also reduce the BER of the legal receiver.