In this paper,a power allocation to maximize tradeoff between spectrum efficiency(SE)and energy efficiency(EE)is considered for the downlink non-orthogonal multiple access(NOMA)system with arbitrarily clusters and arb...In this paper,a power allocation to maximize tradeoff between spectrum efficiency(SE)and energy efficiency(EE)is considered for the downlink non-orthogonal multiple access(NOMA)system with arbitrarily clusters and arbitrarily users,where the subcarriers of clusters are mutually orthogonal to each other.Specifically,an optimization problem of maximizing SE-EE tradeoff is formulated by optimizing power allocation among users under the constraints of user rate requirements.Then,the optimization problem is decomposed into a group of sub-problems with the aim of maximizing SE-EE tradeoff for each cluster,which is solved by using bisection method and monotonicity of function.Finally,the power allocation optimization problem among users is transformed into that between clusters,and a two steps inter-cluster power allocation algorithm is developed to solve this problem.Simulation results show that SE-EE tradeoff of the proposed scheme is better than that of the existing schemes.展开更多
基金This work was supported by the Henan Scientific and Technological Research Project Research(172102210023)Department of Education of Henan Province‘ Research on Clustering and Frequency Band Allocation in JT-CoMP’(19A510013).
文摘In this paper,a power allocation to maximize tradeoff between spectrum efficiency(SE)and energy efficiency(EE)is considered for the downlink non-orthogonal multiple access(NOMA)system with arbitrarily clusters and arbitrarily users,where the subcarriers of clusters are mutually orthogonal to each other.Specifically,an optimization problem of maximizing SE-EE tradeoff is formulated by optimizing power allocation among users under the constraints of user rate requirements.Then,the optimization problem is decomposed into a group of sub-problems with the aim of maximizing SE-EE tradeoff for each cluster,which is solved by using bisection method and monotonicity of function.Finally,the power allocation optimization problem among users is transformed into that between clusters,and a two steps inter-cluster power allocation algorithm is developed to solve this problem.Simulation results show that SE-EE tradeoff of the proposed scheme is better than that of the existing schemes.
