基于能量收集的有源RIS辅助无线通信的中断概率分析

Recent studies have shown that active reconfigurable intelligent surface (RIS) can effectively reduce the number of reflective elements compared to the traditional RIS where a large number of passive reflective components are deployed. Each reflecting element in the active RIS is assisted by an active load, which reflects and amplifies the incident signal instead of only using the adjustable phase shift to reflect the signal. In order for the active RIS to have a stable power output, it is critical to solve the problem of energy supply. First, this paper solves the energy supply problem by introducing energy harvesting (EH) technology, and proposes a new type of active RIS architecture. In this architecture, the edge of the active RIS is equipped with energy harvesting elements to collect radio frequency energy. Then based on this architecture, considering the impact of different energy harvesting channels on the system outage probability, a closed outage probability analytical formula is derived. The numerical results are used to verify the influence of energy harvesting parameters and system parameters on the outage probability of the active RIS.