基于速率分割的可重构智能表面辅助星地融合网络鲁棒安全传输方案OACSCDCSTPCD

Firstly,considering a reconfigurable intelligent surface(RIS)assisted satellite terrestrial integrated network,the satellite employed the rate splitting multiple access technique to serve multiple earth stations in the presence of multi-ple eavers-droppers(Eves),while the terrestrial network leveraged multicast technique to serve many ground users with the assist of RIS.Secondly,assuming that only the Eves'imperfect channel state information could be obtained,a joint optimization problem was formulated to minimize the total transmit power,while ensuring the quality-of-service re-quirement for all users,and adhering to intercept probabilistic constraints.To tackle this noncom vex problem,the S-procedure and the successive convex approximation approach were employed to convert the intercept probabilistic constraints into solved ones.And then a nuclear norm-based penalty function was employed to propose a robust joint al-gorithm to obtain the robust beamforming weight vectors and transmit power.Finally,the simulation results demonstrate the effectiveness and superiority of the proposed transmission scheme.