MMW-NOMA: An Uplink NOMA Communication System Based on the Node Pairing Algorithm of Maximum and Minimum Weight in Underwater Acoustic Networks

In orthogonal multiple access (OMA) communication systems, resources are allocated to numerous users based on time, frequency, or code domains. The low bandwidth of the underwater acoustic network limits number nodes that can be supported by OMA system, due limited resources. innovative concept nonorthogonal (NOMA) provides a solution offers more and increases spectral efficiency. As promising technique, it optimizes power allocation through channel characteristics adopts serial interference cancellation algorithms decode signal at receiver. This paper introduces an system node pairing algorithm maximum minimum weight (MMW-NOMA). First, we build model in UAN scenario. Second, present strategy. Third, design replacement mechanism. Furthermore, offer algorithm. Finally, compare performance MMW-NOMA with randomly paired NOMA (RP-NOMA) frequency division multiplexing (OFDM). Numerical results show outperforms RP-NOMA OFDM throughput, mean square error, energy However, complexity is slightly higher than but significantly lower OFDM. These achieves reasonable trade-off between complexity.