基于SCMA的无人机中继辅助上行通信方案

为提高蜂窝通信系统的上行总吞吐量,在满足用户服务质量需求的前提下,提出了一种基于稀疏码多址接入(sparse code multiple access,SCMA)的无人机中继辅助上行通信方案,通过部署无人机增强网络覆盖,并利用SCMA提高系统传输性能。根据用户的分布和概率视距传输模型,通过交替优化码本、功率和无人机坐标,确定无人机的3维部署位置;进行资源优化后,根据信道状态信息,对子载波进行配对并迭代码本、功率,以获得优化的码本和功率分配方案。仿真结果表明,提出的方案能够有效提高上行吞吐量,并满足用户的服务质量需求。

Relay assisted uplink communication scheme for UAV based on SCMA

In order to improve the total uplink throughput of cellular communication system, we propose an UAV aided uplink communication scheme based on sparse code multiple access (SCMA) to meet the requirements of user service quality. Network coverage is enhanced by deploying UAVs and SCMA is used to improve system transmission performance. According to the user’s distribution and probabilistic line-of-sight transmission model, the three-dimensional deployment position of the UAV is determined by alternating optimization of codebook, power, UAV coordinates. After resource optimization, according to the channel state information, the subcarrier is paired and the codebook and power are iterated to obtain an optimized codebook and power allocation scheme. The simulation results show that the proposed scheme can effectively improve the uplink throughput and meet the service quality requirements of users.