Simulation Of Channel Model And Research On Downlink Precoding For 5G

With the rapid development of mobile communication technology,how to make better use of high-band bandwidth,improve channel capacity and spectrum efficiency has become the focus of the fifth generation mobile communication(Fifth-generation,5G)research.The wireless channel is the basis for studying mobile communication technology.Since 5G mobile communication extends the bandwidth to a higher frequency band,the 5G channel model is needed to better simulate the wireless channel transmission environment of 5G mobile communication.At the same time,due to the application of MIMO(Multiple Input Multiple-Output)antenna technology in 5G mobile communication,the problem of inter-signal interference becomes more serious.The 5G downlink precoding technology can eliminate inter-signal interference and improve the communication system.The channel capacity and spectrum efficiency are one of the key technologies for 5G mobile communication.Therefore,research on 5G channel model and downlink precoding technology is of great significance for promoting 5G international standardization work.The topic of this thesis comes from the National Science and Technology Major Special Project "5G International Standard Candidate Evaluation and Verification".This thesis designs and implements the 5G channel model for 5G mobile communication,and studies the performance of 5G downlink precoding technology.The main research contents of this thesis are as follows:Firstly,for the requirement of the more comprehensive analog wireless transmission environment in the 5G mobile communication channel model,this thesis designs and implements the 5G channel model.This thesis analyzes the design idea of 5G channel model simulation in detail,clarifies the design goal of high flexibility and high scalability of the platform,and elaborates the design scheme of 5G channel model based on the simulation design idea,including the overall design scheme and 5G channel.The detailed design scheme of the four modules of the model's universal parameter configuration module,basic channel module,derived channel module and channel calibration module.According to the simulation design scheme of the 5G channel model,the specific simulation implementation work is complleted,including the construction of the simulation environment and the realization of the sub-module.And based on the simulation data of several research institutions provided by the 3GPP(3rd Generation Partnership Project)proposal,the 5G channel model is simulated and calibrated.The simulation calibration results show that the 5G channel model developed by this thesis has functional correctness and can be used for the performance research of 5G key technologies.Secondly,aiming at the problem of inter-signal interference in 5G mobile communication,based on the simulation development of 5G channel model,this thesis designs and implements the 5G downlink precoding technology proposed by 3GPP.This thesis analyzes the simulation design idea of 5G downlink precoding technology in detail,clarifies the design goals of high flexibility,high scalability and high efficiency of the platform,and completes 5G codebook based and non-based under the guidance of simulation design ideas.The simulation design and simulation implementation of the codebook's downlink precoding technology.In the system-level simulation platform,the average spectral efficiency of the cell and the spectral efficiency of the cell edge based on the Type Ⅰ codebook,Type Ⅱ codebook,and non-codebook based three different downlink precoding techniques are simulated,and the simulation results are performed.Analysis.The simulation results show that the non-codebook-based downlink precoding technology can obtain relatively complete channel state information,and has good adaptive channel capability and best performance.The downlink precoding technology based on Type Ⅰ codebook is in a limited codebook.The precoding matrix is selected in the set,the adaptation channel capability is poor,and the performance is the worst;the downlink precoding technology based on the Type Ⅱ codebook has medium adaptation channel capability,and its performance is between the Type Ⅰcodebook and the non-codebook based downlink precoding techniques.