多载波多用户下行NOMA系统的资源分配算法

非正交多址接入技术作为5G的候选技术之一受到了广泛关注。研究了以系统吞吐量优化为目标的多载波多用户NOMA系统下行链路的资源分配问题。在该问题的求解中，为了提高系统的吞吐量，子载波间采用线性注水算法，叠加用户间采用分数阶功率分配算法。同时，考虑了远近用户数目不等场景下能够调度更多的用户，在NOMA传输方案设计中引入时分的概念，将整个时间段t分为两个时隙，在不同时隙内实现不同远近用户分组的动态配对方案，从而在保证用户公平性的基础上，充分利用子信道资源，实现系统吞吐量的优化。仿真结果表明，对比于传统NOMA和OFDMA，提出的方法可以在相同的发射功率情况下传输更多的比特数。

Resource allocation algorithm for the downlink of multi-carrier and multi-user NOMA systems

Non-orthogonal multiple access (NOMA) technology had received considerable attention as a candidate technology for 5G cellular systems.The resource allocation problem in multi-carrier and multi-user downlink NOMA systems were studied with the goal of optimizing system throughput.In the solution of the problem,the linear water-filling power allocation was used between subcarriers as the fractional transmit power allocation algorithm was used between the superposed users,so that system throughput could be improved.Meanwhile,the concept of time slot was adopted in the design of NOMA transmission scheme,in order to be able to schedule more users in the scenario where the number of cellcenter users and celledge users were not equal.The whole time period was divided into two time slots.On the basis of ensuring the fairness of users,different user pairing groups were implemented in different time slots so as to fully utilizing the entire resource to improve system throughput.The simulation results show that this method can transmit more bits under the same transmit power comparing with traditional non-orthogonal multiple access(NOMA) and OFDMA.