In order to improve the total uplink throughput of cellular communication system,we propose an UAV aided up-link 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.Accord-ing 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 op-timized codebook and power allocation scheme.The simulation results show that the proposed scheme can effectively im-prove the uplink throughput and meet the service quality requirements of users.
关键词
无人机3维部署/稀疏码多址接入/资源分配/中继通信
Key words
three-dimensional deployment of unmanned aerial vehicle/sparse code multiple access(SCMA)/resource allo-cation/relay communication
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