摘要
当前蜂窝系统频谱资源极度短缺,免授权频谱因而被建议在蜂窝系统中使用。无人机(UAV)的飞行轨迹和功率控制对频谱利用效率有重大影响。然而,基于频谱共享的3维轨迹和功率优化方法却鲜少研究。为此,该文首先提出一种全频谱共享方法,即无人机通过控制上行蜂窝用户和设备到设备(D2D)用户的发射功率,在不影响WiFi设备正常传输的前提下使用免授权频谱;同时无人机也能够在不影响其他下行蜂窝用户的前提下使用授权频谱。然后基于提出的全频谱共享方法,该文构建了无人机电池能量约束下的3维飞行轨迹和发射功率的联合优化问题。为了求解提出的复杂多变量耦合的非凸优化问题,该文采用块坐标下降和连续凸逼近方法将原问题转化为3维轨迹优化和功率控制两个凸优化子问题并迭代求解。大量仿真结果证明提出的基于3维轨迹和功率优化的全频谱共享方法能够显著提高频谱利用效率。
Due to the extreme shortage of licensed spectrum in cellular systems currently,unlicensed spectrum is thus recommended for cellular systems.The Unmanned Aerial Vehicle(UAV)flight trajectory and power control have a significant impact on spectrum utilization efficiency.However,Three-Dimensional(3D)flight trajectory and power optimization methods based on full spectrum sharing have rarely been unstudied.Therefore,a full spectrum sharing method is first proposed in this paper,where the UAV can use the unlicensed spectrum by controlling the transmission power of uplink cellular users and Device to Device(D2D)users without affecting the data transmission of WiFi devices;at the same time,the UAV can use the licensed spectrum without affecting other downlink cellular users.And then,based on the proposed full spectrum sharing method,a joint optimization problem of 3D flight trajectory and transmission power is constructed under the energy constraint of the UAV battery.In order to solve the proposed complex non-convex optimization problem with multi-variable coupling,the successive convex approximation technique and block coordinate descent method are used to transform the original problem into two convex optimization subproblems i.e.3D trajectory optimization and power control and solve them iteratively.A large of simulation results show that the proposed spectrum sharing method based on 3D trajectory and power optimization significantly improves the spectrum utilization efficiency.
作者
裴二荣
陈新虎
陈琪美
孙远欣
黎伟
PEI Errong;CHEN Xinhu;CHEN Qimei;SUN Yuanxin;LI Wei(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Electronic Information School,Wuhan University,Wuhan 430072,China;Chongqing Jinmei Communication Co.,Ltd,Chongqing 400035,China)
出处
《电子与信息学报》
EI
CAS
CSCD
北大核心
2024年第3期835-847,共13页
Journal of Electronics & Information Technology
基金
国家自然科学基金(62071077)
重庆成渝科技创新项目(KJCXZD2020026)。
关键词
全频谱共享
无人机通信
设备到设备
3维轨迹
功率控制
Full spectrum sharing
Unmanned Aerial Vehicle(UAV)Communication
Device to Device(D2D)
3D trajectory
Power control
