Analysis of STAR-RIS Assisted Downlink CoMP-NOMA Multi-Cell Networks under Nakagami-m Fading

In this letter, we conduct a thorough analytical assessment of a simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) assisted non-orthogonal multiple access (NOMA) enhanced coordinated multipoint (CoMP) multi-cell network under Nakagami- m fading. Using the central limit theorem (CLT) and moment-matching based Gamma approximation method, we derive the distributions of effective and cascaded channel gains. Subsequently, leveraging these results, we formulate tractable equations for ergodic rates and outage probabilities across all users in the network. Our analytical results correlate with the simulation results, affirming the efficacy of analytical methodology. Furthermore, the results demonstrate a significant performance improvement of STAR-RIS assisted CoMP-NOMA networks compared to conventional systems.