Sum Rate Maximizing Superposition Coding Scheme for a Two-User Wireless Relay System

A wireless system is considered where users are served in Downlink (DL) by one Base Station (BS) and one Relay Station (RS). A scheme based on Superposition Coding (SC) is proposed, where two users are served by three superposed layers that take advantage of the three available links for maximizing sum rate. With the derived optimal allocation parameters, our scheme outperforms benchmark schemes for sum-rate and fairness, making it very efficient for scheduling multiple users.