In this paper, we investigate a state-of-the-art reconfigurable intelligent surface (RIS)-assisted spatial scattering modulation (SSM) scheme for millimeter-wave (mmWave) systems, where a more practical scenario that the RIS is near the transmitter while the receiver is far from RIS is considered. To this end, the line-of-sight (LoS) and non-LoS links are utilized in the transmitter-RIS and RIS-receiver channels, respectively. By employing the maximum likelihood detector at the receiver, the conditional pairwise error probability (CPEP) expression for the RIS-SSM scheme is derived under the two scenarios that the received beam demodulation is correct or not. Furthermore, the union upper bound of average bit error probability (ABEP) is obtained based on the CPEP expression. Finally, the derivation results are exhaustively validated by the Monte Carlo simulations.

翻译：本文研究了一种面向毫米波系统的新型可重构智能表面（RIS）辅助空间散射调制（SSM）方案，其中考虑了一种更实际的场景：RIS靠近发射机而接收机远离RIS。为此，分别利用发射机-RIS链路的视距（LoS）链路和RIS-接收机链路的非视距（NLoS）链路。通过在接收端采用最大似然检测器，推导了在接收波束解调正确与错误两种场景下RIS-SSM方案的条件成对错误概率（CPEP）表达式。进一步，基于CPEP表达式获得了平均误比特率（ABEP）的联合上界。最后，通过蒙特卡洛仿真对推导结果进行了全面验证。