Design And Implementation Of UAV Ad Hoc Network Node Based On OFDMA

In current society,the development of science and technology tends to be rapid.Among them,the development of drones is particularly prominent,which has played a significant impact on all walks of life,especially in agriculture,wildlife protection,rescue and so on.However,at present,the mainstream drones still use traditional communication control methods and rely heavily on the ground base station system,which leads to the low networking rate of the current drones and the small number of drone nodes accommodated in the system at the same time.It cannot well meet the scenarios such as football game broadcast,search and rescue,etc.that require large-scale drone swarms to quickly form a network to enter the mission.Aiming at these problems,this paper designs a new UAV node.The design of UAV node is based on SoC platform,and its main function is to realize the data interaction between nodes.In the design,the UAV node is divided into four modules:baseband processing module,RF module,power module and clock module.The coordination and cooperation of the four modules ensure the smooth progress of wireless communication.In order to improve the number of simultaneous access of UAV nodes,OFDMA access mode is adopted in the design.Aiming at the SoC platform,this paper also considers the relevant requirements of resource allocation algorithm when designing the whole baseband processing unit.Shen algorithm is selected from the PS side to realize wireless resource allocation,and the baseband processing process is designed from the PL side,including channel coding/decoding,modulation/demodulation,increase/decrease pilot,IFFT/FFT,increase/decrease cyclic prefix,etc.At the same time,in order to deal with the influence of Doppler effect caused by UAV’s high-speed movement on OFDMA system,the corresponding frequency offset compensation method is adopted to improve the efficiency of communication between nodes.Finally,a complete test environment is built to ensure that the Shen algorithm and the frequency offset compensation algorithm can complete the resource allocation and reduce the Doppler frequency offset effect,and ensure that the entire system can meet the wireless communication requirements required by the UAV node.