To enhance the performance of the unmanned aerial vehicle(UAV)-assisted communication network based on the orthogonal frequency division multiple access(OFDMA)mode,the rational network allocation and optimal allocation of communication resources were studied.Firstly,in order to maximize the fairness of the network,a mixed-integer nonlinear maximum-minimum optimization problem was modeled by combining the communication resources including sub-channel allocation,modulation mode selection,and power allocation with UAV position.Then,the iterative optimization method was used to solve the problems of variable coupling and non-convex,and the maximum-minimum problem was converted into two sub-problems:joint optimization of sub-channel allocation and modulation mode selection and joint optimization of UAV position and sub-channel power.Finally,by means of appropriate transformations,the two subproblems were modeled into 0-1 linear optimization problem and convex optimization problem for solution.The experimental simulation results show that the proposed algorithm can jointly optimize multidimensional system parameters such as network allocation and communication resources,effectively enhance the fairness of network users,and improve network performance compared with other benchmark schemes.
维普
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