Research On Uplink Tranmission Technology Of Communication Network Based On Uav

In re?ent years,with the development of UAV(Unmanned Aerial Vehicle)-related technologies,the UAV-related applications have gradually increased due to the flexibility of UAV,the ease of deploying communication networks,and the low cost of building networks.At this stage,the number of user terminal equipment connected to the communication network has greatly increased,and the uplink communication services have increased.In the communication scenario with a large number of users,it is difficult for traditional base stations to support the communication performance of users’ uplink transmission.Therefore,it is imminent to use UAV as an auxiliary base station to restore the user’s uplink communication performance.Aiming at the scenario of UAV-assisted communication network uplink transmission,a new transmission method for uplink communication of ground users is proposed,and the optimization of system communication performance in the communication process is studied.The main research contents are as follows:Firstly,in view of the low uplink communication rate caused by a large number of mobile users accessing the communication network,a joint beamforming uplink transmission technology based on UAV positioning is proposed.It can locate and track the position of the UAV,and after determining the position of the UAV,use the joint beamforming transmission method to transmit signals to the UAV direction to complete the uplink transmission.Compared with other positioning algorithms,the proposed positioning algorithm has higher positioning accuracy and can accurately locate in the case of occlusion;the proposed transmission method has a better effect on the improvement of the system communication rate compared with other transmission methods.Finally,in view of the challenge of balancing the relationship between the energy consumption of the system user and the UAV receiving signalto-noise ratio,the constraints of the maximum transmit power of the system users and the minimum constraints of the system’s received signal-to-noise ratio are considered,and it is modeled as an optimization problem.A distributed beamforming design algorithm with balanced uplink transmission signal-to-noise ratio is proposed to obtain the optimal distributed beamforming weight matrix.Experiments show that the algorithm can effectively reduce the user’s transmit power to achieve the purpose of energy saving,and can meet the requirements of the system’s receiving signal-to-noise ratio to ensure the communication quality.And it is proved that increasing the certainty of the channel and the number of users helps to improve the system’s receiving signal-to-noise ratio.