Özet:

Abstract NOMA is one of the methods seen to be a good way to solve performance issues and an additional way to grant multi-user access. NOMA should be integrated with cooperative reliance on to significantly improve the performance parameter for NOMA wireless networks, such as outage probability and attainable rate, In order to overcome the deep fading of wireless propagation and reduce the outage probability In this paper,  a fixed power allocation for an AF/DF cooperative NOMA scheme for downlink transmission with two users is presented, in which more power was allocated to the distant user and less to the close user at the base station. When the AF and DF protocols are used at the relay node, the signals are superimposed and sent to the relay. Simulation results confirm the analytic findings and show that the proposed method outperforms orthogonal multiple access (OMA), conventional NOMA, and cooperative NOMA in terms of throughput, sum rate, and outage probability. This paper demonstrates the advantages of a fixed power allocation of NOMA over an OMA scheme for the cooperative AF/DF NOMA protocols. Contrast with previous work , all performance metrics was investigated such  System Outage Probability (SOP), BER, and throughput for both AF and DF relaying, along with the  impact of  the fixed power allocation in a cooperative NOMA system under AF and DF relaying protocol.

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