Research On Cross-slot Interference Based On Uplink And Downlink Coupling Simulation

The rapid development of wireless communication technology has made today’s society a data-based and information-based era,and mobile communication users have far more requirements for the speed and amount of data acquisition than before.The gradual shortage of spectrum resources and the increase in mobile communication users have forced communication to develop to high frequency bands to expand spectrum resources.At present,the fifth generation mobile communication(The 5th Generation,5G)has taken the millimeter wave band as the main frequency band.As an important tool to evaluate new wireless communication technologies and promote 5G standardization,system-level simulation platform plays a significant role.To this end,this paper builds a 5G systemlevel uplink and downlink coupling simulation platform in the millimeter wave band to study new 5G technologies,evaluate new algorithms,and analyze communication system performance.This paper mainly includes three innovations:the construction of 5G system-level uplink and downlink coupling simulation platform based on millimeter wave frequency band,the research of uplink multi-user MIMO scheduling algorithm,and the modeling method of cross-slot interference.First of all,this article introduces the development history and performance requirements of 5G mobile communication system and research on 5G key technologies.Next,the 5G system-level coupling simulation platform is designed and implemented.The paper describes the overall operation process of the platform,and then introduces the core modules of the platform:parameter input and result output module,user and base station initialization module,channel modeling module,resource scheduling module,user and base station process module,and HARQ module.The biggest feature of this platform is the coupling simulation of uplink and downlink,that is,the simulation of the uplink and downlink independent of each other and without interfering with each other under the same time drive system.The platform itself is compared with the three simulation types of uplink,downlink and coupling simulation of the platform,and the correctness of the platform construction is verified.The simulation results show that the throughput of the coupling simulation platform in the coupling simulation is not much different from the throughput when simulating a link alone.Secondly,a new scheduling algorithm is proposed for the uplink multiuser MIMO.The algorithm is based on the proportional fairness algorithm,considering the maximum throughput for user pairing.Based on the 5G coupling simulation platform,the scheduling algorithm is implemented,and the simulation performance analysis is carried out in the urban macro cell scenario.The simulation results show that the uplink multi-user MIMO scheduling algorithm based on the maximum throughput criterion can bring significant throughput gain to the system when two users are paired.Finally,the concept of cross-slot interference is proposed,and the theoretical description and modeling of cross-slot interference of uplink interferes downlink and downlink interferes uplink are theoretically described and modeled.Based on the 5G coupling simulation platform,different cells can simulate the characteristics of different frame structures to realize cross-slot interference,and simulate and analyze the interference level in urban macro cell scenario.The simulation results show that the interference from the downlink to the uplink is obvious,which has a great impact on the throughput and SINR of users in the system.However,the interference from the uplink to the downlink is small,and the impact on the throughput of users in the system is not large.