Interference Characteristics And Performance Analysis Of Full-Duplex System In LTE

In order to solve the problem of spectral scarcity in next generation mobile communication systems,the co-time co-frequency full duplex is proposed as a new duplex scheme.However,the self-interference generated by the transmitting antenna and the receiving antenna at the full-duplex node is a major challenge to researchers.This thesis aims at studying the self-interference problem in full-duplex system.Firstly,this thesis analyzes the residual self-interference model in full-duplex link level,and introduces the self-interference channel estimation and reconstruction method to eliminate the residual self-interference.According to the characteristics of self-interfering channel,a special pilot pattern is designed and an enhanced channel estimation algorithm based on Linear Minimum Mean Square Error(LMMSE)is proposed.Through simulation,the ameliorated algorithm successfully reduces the residual self-interference and effectively improves the self-interference suppression performance of the full-duplex system.Secondly,this thesis analyzes the interference model in full-duplex system.By building a simulation platform using Matlab,the simulation results are coincident with the theoretical formula.Based on the simulation platform,the performance of full-duplex and half-duplex techniques in terms of SINR and rate are compared.The simulation results show that the full-duplex system has a significant performance improvement over the half-duplex system in terms of rate.In addition,this thesis also designs an improved user pairing algorithm fit for different system loads.The algorithm takes the average rate as the optimization target,and significantly improves the overall performance of the full-duplex system while taking into account the fairness issue.The effect of the algorithm is verified by the simulation results.Finally,this thesis studies the full-duplex multi-cell network based on the spatial point process,and compares the performance of several typical network topologies such as hexagonal,Poisson Point Process(PPP)and Matern hard core Ⅱ.Through the appropriate design of the simulation parameters,the simulation results of coverage probability and ASE are obtained.