Investigation of Power Allocation for Downlink NOMA under Different Performance Metrics

With the increasing demand for services and data traffic, next-generation mobile communication systems must deliver higher data rates, ultra-low latency, and enhanced connectivity. Non-orthogonal multiple access (NOMA) has emerged as a promising solution, allowing multiple users (MU) to share a single channel whether in frequency, time, code, or spatial resources—simultaneously, improving spectral and energy efficiency. This research paper studies power allocation for multiple users sharing one channel under different performance metrics. Sum rate maximization focuses on total throughput, while fairness ensures equitable resource allocation. Energy efficiency minimizes energy use. Balancing these metrics enables efficient power allocation for next-generation mobile communication systems. Moreover, research paper discussed effect of trade off on power allocation for downlink NOMA under different performance metrics.