As non-orthogonal multiple access technology can achieve higher system throughput
spectrum efficiency and energy efficiency than traditional orthogonal access technology
it has become a research hotspot of 5G multiple access technology.In this paper
a power allocation strategy based on Improved Particle Swarm Optimization (IPSO) is proposed to optimize the energy efficiency of NOMA downlink system.The Standard Particle Swarm Optimization (SPSO) is improved in three aspects
and the IPSO algorithm is used to solve the objective function to maximize the energy efficiency of the system.The simulation results show that at the optimal power allocation point
the IPSO algorithm can significantly improve the energy efficiency of the system.