| 摘要: |
| 可重构智能表面（Reconfigurable Intelligent Surface，RIS）辅助通感一体化(Integrated Sensing and Communication，ISAC)系统通过动态调控电磁波实现通信与感知功能的协同优化。为研究恶意干扰机对RIS-ISAC系统安全性能的影响，通过联合优化基站（Base Station，BS）发射波束成形矩阵与RIS相移矩阵，在满足BS接收回波信干噪比、BS发射功率及RIS反射幅度约束的前提下，建立了系统安全速率最大化问题。仿真结果表明：高干扰机功率场景中，干扰机靠近基站时系统安全速率较远离基站降低37.2%，且当干扰机功率超过42 dBm时其位置敏感性增强；增加RIS元件数量可补偿雷达信干噪比提升导致的通信性能损失；干扰机功率小于42 dBm时，较少RIS元件即可实现理想安全速率；扩展RIS规模可以补偿基站发射功率损耗，且干扰机位置影响随基站发射功率的增加而减弱。 |
| 关键词: 通感一体化 可重构智能表面 安全传输性能 恶意干扰 |
| DOI：10.20079/j.issn.1001-893x.250723001 |
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| 基金项目: |
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| Impact of Malicious Jammers on Secure Transmission Performance of RIS-ISAC Systems |
| LIANG Yan,LIN Siqing |
| (1.School of Communications and Information Engineering，Chongqing University of Posts and Telecommunications，Chongqing 400065，China;2.Chongqing Key Laboratory of Signal and Information Processing，Chongqing 400065，China) |
| Abstract: |
| The reconfigurable intelligent surface (RIS) aided integrated sensing and communication (ISAC) system achieves the coordinated optimization of communication and sensing functions by dynamically regulating electromagnetic waves.To investigate the impact of malicious jammers on the security performance of RIS-ISAC systems，a system security rate maximization problem is established.This is done by jointly optimizing the transmit beamforming matrix of the base station (BS) and the phase shift matrix of RIS，while satisfying the constraints on the BS’s received echo signal-to-interference-plus-noise ratio，BS transmit power，and RIS reflection amplitude.Simulation results show that：①In scenarios with high jammer power，the system security rate decreases by 37.2% when the jammer is close to the BS compared with when it is far away；moreover，the position sensitivity of the jammer increases when its power exceeds 42 dBm.②Increasing the number of RIS elements can compensate for the communication performance loss caused by the improvement of radar SINR.③When the jammer power is less than 42 dBm，a small number of RIS elements are sufficient to achieve the ideal security rate.④Expanding the RIS scale can compensate for the BS transmit power loss，and the influence of the jammer’s position weakens as the BS transmit power increases. |
| Key words: integrated sensing and communication reconfigurable intelligent surface secure transmission performance malicious jammer |
《电讯技术》编辑部 