Performance Analysis of Multi-user Cooperative Non-orthogonal Multiple Access on Time-Sharing Basis

Non-orthogonal multiple access (NOMA) has taken place as one of the key empowering technique in 5G networks and beyond. For multiple users in the network, the work in this paper presented a cooperative non-orthogonal multiple access (C-NOMA) system based on the time-sharing model. An amalgamation of cooperative communication with NOMA alleviates the system's performance by improving diversity gains leading to superior reception reliability and user fairness. When the number of users increases within a network, then power distribution become challenging with C-NOMA system. In this study, a complete power allocation method using user clustering and one of the conventional multiple access technique that is time division multiple access (TDMA) techniques in the scenario of downlink C-NOMA networks is examined. While TDMA is used between different clusters, C-NOMA allows users within the same cluster to receive signals concurrently. Hybrid TDMA C-NOMA (HTCN) is the name given to the proposed user clustering with time slot allocation systems. Using the aforementioned methodologies, the outage probability and system throughput are thoroughly evaluated. Matlab simulation is used to put it into practice. In the current network, the proposed method outperforms simple NOMA and simple TDMA.