  In this paper, Recofigurable Intelligent Surface (RIS) assisted dual-hop
multicast wireless communication network is proposed with two source nodes and
two destination nodes. RIS boosts received signal strength through an
intelligent software-controlled array of discrete phase-shifting metamaterials.
The multicast communication from the source nodes is enabled using a Decode and
Forward (DF) relay node. In the relay node, the Physical Layer Network Coding
(PLNC) concept is applied and the PLNC symbol is transmitted to the destination
nodes. The joint RIS-Multicast channels between source nodes and the relay node
are modeled as the sum of two scaled non-central Chi-Square distributions.
Analytical expressions are derived for Bit Error Rate (BER) at relay node and
destination nodes using Moment Generating Function (MGF) approach and the
results are validated using Monte-Carlo simulations. It is observed that the
BER performance of the proposed RIS assisted network is a lot better than the
conventional non-RIS channels links.
