Nash Bargaining Based Power Allocation and Relay Selection for Cooperative NOMA Aided Spectrum Sharing Systems

This paper deals with the power allocation and relay selection problem in the cooperative Non-Orthogonal Division Multiple Access (NOMA) aided spectrum sharing system. In the proposed system, a number of Secondary Users (SU) compete for the opportunity to transmit their data on the licensed spectrum of Primary User (PU). By adopting NOMA, the selected SU can transmit his own signal simultaneously when relaying the information for PU. We formulate such a cooperative progress as a Nash Bargaining game where the objective is to maximize the product of the utilities of the PU and SUs. The Nash Bargaining Solution based algorithm is proposed to solve the power allocation and relay selection in a step by step manner. Simulation results demonstrate that the proposed algorithm outperforms other schemes and can improve the system performance significantly.

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