An Optimal Resource Allocation Algorithm Based on Sum Rate Maximization for Uplink SCMA system

Abstract

An optimal resource allocation algorithm based on sum rate maximization for uplink Sparse Code Multiple Access (SCMA) is proposed in this paper. The goal of the algorithm is to solve the problem of resource allocation based on maximizing system and rate in the uplink SCMA system. Firstly, based on the inter-user interference model in the system, an optimal subcarrier allocation algorithm is proposed to solve the subcarrier allocation problem. Then, based on the subcarrier allocation scheme, the optimization problem for maximizing the system sum rate is reduced to a convex optimization problem. A power allocation scheme is obtained by solving the convex optimization problem. Finally, the subcarrier allocation optimization algorithm and the power distribution solution are combined and iteratively optimized. Simulation results demonstrate that the proposed optimization algorithm can effectively increase the total capacity of the uplink SCMA system.