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요약정보
智能反射面赋能无人机边缘网络计算卸载方案 / Computation offloading scheme for RIS-empowered UAV edge network
Resource Type
Academic Journal
Authors
李斌
;
刘文帅
;
谢万城
;
费泽松
;
LI Bin
;
LIU Wenshuai
;
XIE Wancheng
;
FEI Zesong
Source
通信学报 / Journal on Communications
. 43(10):223-233
Subject
无人机通信
移动边缘计算
智能反射面
计算卸载
资源分配
Language
Chinese
ISSN
1000-436X
Online Access
Scopus
Find it @ DONGA
초록
针对无人机辅助边缘计算城市场景,因无人机与地面用户之间的任务卸载链路易受障碍物遮挡而造成卸载速率低的问题,提出了一种智能反射面赋能的无人机边缘计算部分任务卸载方案.联合考虑任务分配、用户发射功率、智能反射面相移矩阵、无人机计算资源分配以及无人机轨迹,建立了一个用户最小平均数据吞吐量最大化问题.由于该问题是一个随机优化问题,且优化变量之间密切耦合,难以直接求解.因此,首先通过利用数学期望的性质,将随机优化问题转换为确定性优化问题;其次,利用块坐标下降算法将确定性优化问题分解为3个子问题,并通过引入辅助变量、利用连续凸近似和半定松弛技术将非凸问题转换为凸优化问题,进而得到问题的近似次优解.仿真结果表明,所提方案具有良好的收敛性能,并有效地提高了地面用户的平均数据吞吐量.
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