【摘要】 可重构智能表面（RIS）赋能的共生无线通信是提升谱效与能效的新兴技术，但传统无源RIS仅能被动反射信号，增益受限。有源RIS通过主动放大信号可提升增益，因此将有源RIS引入至共生无线通信，并提出一种协作调制与波束赋形联合设计方案。该方案通过协作优化主系统发送波束赋形与有源RIS调制方案，来最大化接收端组合信号的最小欧氏距离，并设计基于半正定松弛与连续凸逼近的迭代优化算法。仿真表明，相较于无源RIS，有源RIS能显著增强系统整体的误符号率性能。更多还原

【Abstract】 Reconfigurable intelligent surface (RIS)-enabled symbiotic wireless communication emerges as a promising technology for spectral and energy efficiency enhancement,yet conventional passive RIS passively reflects signals with limited gain.Active RIS achieves higher gain through active signal amplification.This paper introduces active RIS into symbiotic wireless communications,proposing a joint cooperative modulation and beamforming design scheme that maximizes the minimum Euclidean distance of combined signals at the receiver through cooperative optimization of primary system transmit beamforming and active RIS modulation.An iterative optimization algorithm based on semidefinite relaxation and successive convex approximation is developed.Simulations demonstrate that active RIS significantly outperforms passive RIS in overall system symbol error rate performance.更多还原