Akademik Veri Yönetim Sistemi
33rd Telecommunications Forum, TELFOR 2025, Belgrade, Sırbistan, 25 - 26 Kasım 2025, (Tam Metin Bildiri)
This paper investigates the leakage rate performance of an untrusted reconfigurable intelligent surface (RIS)-assisted system under imperfect channel state information (CSI), resulting from channel estimation error (CEE) and feedback delay (FD). The study investigates a scenario in which a single mobile terminal communicating with a base station through an untrusted RIS operating in either passive or absorptive mode. To mitigate information leakage, a limited number of friendly jammers are deployed to interfere with the untrusted RIS. Outage probability is used as the performance metric to evaluate the system's leakage rate. Analytical and Monte Carlo simulation results reveal that CEE introduces coding gain losses in the low signal-to-noise ratio (SNR) regime, but its impact becomes negligible at high SNR. In contrast, F-D has no notable effect at low SNR but causes performance degradation in the high SNR regime. In both cases, friendly jammers contribute additional coding gain losses at high SNR. However, increasing the number of RIS reflecting elements significantly reduces these adverse effects. Finally, the results demonstrate that the untrusted RIS in passive mode outperforms the absorptive mode, primarily due to differences in the energy reflection coefficient.