Coexistence Interference Of 5G NR System

5G(the 5th Generation wireless systems)is a new generation wireless system after 4G LTE(the 4th Generation wireless systems long term evolution).In the future,5G wireless system will have high speed,ultra-low latency,high reliability and low energy consumption to meet the specialized and differentiated requirements of multiple business scenarios.However,due to the interference between the frequency resources,the coexistence between the 5G wireless system and other systems needs to be considered before the actual networking,and provide reference data for the formal commercial deployment of the 5G wireless system.This thesis focuses on the coexistence of 5G new radio(NR)system,and analyzes the system coexistence between 5G NR system and 4G LTE system,5 G NR systems,UAV-assisted(Unmanned Aerial Vehicle)cellular networks systems.Meanwhile,Monte Carlo simulation technology is used to build the simulator and the ACIR(Adjacent Channel Interference Ratio)isolation required for different scenarios is studied.In the part of coexistence between the 5G NR system and the 4G LTE system,the research is mainly on the frequency below 6 GHz.By separately analyzing the propagation models and the antenna gain of the two systems,the coupling loss of the signal during the propagation is obtained,and the uplink and downlink SINR(Signal to Interference plus Noise Ratio)is further obtained by combining the base station and the user's transmit power and ACIR model.Through the mapping of SINR to throughput,throughput loss under different ACIR is obtained.With the simulator,it can be concluded that the ACIR required for the NR system to coexist with the LTE system is approximately 25 dB.In the part of coexistence between 5G NrR systems,the similarities and differences between the NR system propagation model above 6 GHz and below 6 GHz are analyzed firstly.Then the influence of beamforming on system performance is studied.The beamfonning can strengthen the service signal and reduce the interference signal,thereby improving the SINR of the user and improving the throughput of the system.At the same time,the simulator is used to simulate and analyze the NR system in different network topologies and scenarios.The simulation results of geographical offset and in-band blocking are analyzed at last.In the part of coexistence in the UAV-assisted cellular networks systems,it mainly studies the deployment of UAV base stations and the coexistence of two systems.The UAV base station is first deployed by the bisecting K-means clustering algorithm.This method can realize the automatic deployment of UAV base station and effectively improve the system throughput.Then the system coexistence between the drone small cell system and the cellular macro cell network system is studied.At last,it is concluded that the ACIR isolation required for coexistence in particular scenarios are about 5dB.