Performance of Double Reconfigurable Intelligent Surface Assisted Communication System

Since reconfigurable intelligent surface(RIS) enhances the spectral efficiency of wireless communication system, it is a promising technology in the future communication. However, if there are a lot of obstacles, single RIS cannot guarantee performance and double RIS experiences fading three times. So, this paper suggests double RIS assisted communication system with amplifier. Suggested RIS system is compared with conventional RIS system in terms of bit error rate and sumrate. Simulation result shows that the performance of suggested RIS system outperforms single RIS system by 4.7% and double RIS system without amplifier by 12.6%, in terms of sumrate.