Space-Time-Frequency Domain Multiple Access Method For Integrated Sensing And Communication Enabled UAV Ad Hoc Network

Unmanned aerial vehicles(UAVs)have the advantages of wide coverage,high communication reliability,high flexibility and low cost,etc.UAVs can maintain stable communication connections in the air through networking to improve the reliability and stability of communication and meet the demand of large amount of data transmission,and are widely used in various scenarios.Sensory communication integration technology allows radar and communication to work in the same system,with the advantage of sharing hardware and spectrum resources.Under the mechanism of sensory communication integration,how to design the beam assignment scheme of UAV self-assembling network and the multi-access scheme of UAV network to realize the division of space-time and frequency domain and jointly guarantee the efficient and safe transmission is the main research content of this paper.In this paper,we first study the beam assignment technique in a sensory communication integrated sensing and propose an innovative multibeam model based on a UAV network in a 3D environment.The model is capable of simultaneously generating a communication subbeam that is stabilized to point in the communication direction and a time-varying radar scanning subbeam,and guarantees a lower bound on the beam gain in the communication direction.In order to further improve the access performance of the UAV network,this paper also analyzes the effect of beamwidth on the communication performance and proposes a beam assignment scheme with adjustable beam width.The simulation results show that the multibeam model can be effectively applied to the complex UAV networking environment,and it has a certain enhancement on the access performance of the network.In addition,for the characteristics of UAV network with strong mobility,large number of nodes and wide coverage,this paper proposes a multiaccess scheme for UAV network based on the integration of sensing and communication.This scheme utilizes sensing information to assist access,adopts a new radar and communication scheduling model,introduces a radar echo protection interval to ensure the normal operation of radar and communication,and redesigns the channel allocation method on this basis.In this paper,the performance of this multi-access scheme is theoretically analyzed using Markov model,and simulation comparison with traditional multi-channel protocols is carried out,and the simulation results show that the newly proposed multi-access scheme can effectively realize the perception and communication functions of the UAV network without affecting the communication performance,and improve the throughput and access efficiency of the system.