NOMA系统在下行链路中的功率分配

为了满足非正交多址接入(non-orthogonal multiple access,NOMA)系统下行链路的一个多用户集群中不同用户的业务需求,提出了具有用户服务质量(quality of service,QoS)保证与最大最小(max-min)公平性准则的功率分配算法。针对不同用户需求,制定了在基站发射总功率与用户满足的最低速率要求约束下的max-min公平准则的优化问题模型,并利用二分法与Karush-Kuhn-Tucker(KKT)条件对复杂的非凸问题进行求解。仿真结果表明,该功率分配算法既保证了用户的QoS要求又满足了用户的公平性准则,并且NOMA系统的吞吐量相较于传统多址接入系统的吞吐量有较大的提升。

Power allocation for NOMA system in downlink

In a multi-user cluster of the downlink non-orthogonal multiple access (NOMA) system, in order to satisfy the service requirements of different users, the power allocation algorithm with quality of service (QoS) guarantee and max-min fairness criterion is proposed. According to different user requirements, an optimization problem is formulated which is aiming for the max-min fairness criterion under the total power and minimum rate requirement constraints. The problem is solved by the bisection method and Karush-Kuhn-Tucker (KKT) conditions. Simulation results show that the power allocation algorithm guarantees users’ QoS requirements and satisfies the fairness criterion. Compared with the traditional multi-access system, the throughput of the NOMA system is greatly improved.