Performance of Multiple Intelligent Reflecting Surfaces Assisted Communication

Intelligent Reflecting Surface (IRS) is an emerging passive device that implements passive beamforming by adjusting the amplitude and the phase of incident signal through a large number of passive reflection units on its surface. Many propagation paths can be constructed from a transmitter to an IRS, and then from the IRS to a receiver, thereby enhancing the received signal and improving the communication quality. In this paper, we evaluate the performance of wireless propagation paths without direct link assisted by multiple IRSs by leveraging stochastic geometry to model the locations of base stations (BSs) and IRSs. By analyzing the coverage probability and average rate of a typical user at a blind spot assisted by multiple IRSs which are modeled by stochastic geometry, we observe that increasing the number of IRSs will effectively improve the performance, however, the improvement will be smaller and smaller.