Enhancing multicast capacity using opportunistic relaying

An opportunistic relaying strategy is introduced in this paper to enhance the performance of multicasting. The key feature of this work is to provide an additional diversity to the multicast users selecting best relay from a group of multiple relays. It is assumed that there is no direct path between the source and the destinations and communication occurs only through the relays. The best relay is selected employing selection combining technique and the performance of multicast channels is analyzed in terms of the multicast capacity and the outage probability. In order to clarify the insight of numerical results, all the expressions are derived in analytical form and the validity of derived expressions are justified via Monte-Carlo simulation.