Performance Evaluation of RIS-Assisted Full-Duplex MIMO Bidirectional Communications with a Realistic Channel Model

Thanks to their capability in controlling the wireless channels in a dynamic way, metamaterial-based reconfigurable intelligent surfaces (RIS) can help in providing low error rates and high data rates, as per the requirements of future wireless applications. In many of the envisioned applications, devices need to interchange data within close proximity. In this context, this paper proposes a RIS-assisted full-duplex MIMO bidirectional model for communication between multiple devices, and analyzes its performance while considering a realistic model for the communication channels, which accounts for key physical characteristics and impairments. The system performance is evaluated in terms of the symbol error probability, outage probability, and channel capacity, for which closed-form expressions are derived while taking into account residual hardware impairments and residual self-interference at the devices, and considering operations in both indoor and outdoor environments. The results reveal that system operations in indoor environments yield better performance as compared to outdoor scenarios, and quantify the impacts of the hardware impairments and self-interferences.