Research And Experimental Verification Of LTE Non-cooperative Reception Enhancement Technology

The non-cooperative receiving technology is outside the normal communication system.After receiving the signals of the normal communication parties,the unauthorized third party performs signal processing and analyzes the process of sending and receiving information.It is an important link in the information interception system and is of great significance to the field of technical reconnaissance.In recent years,with the development of LTE(Long Term Evolution),OFDM-MIMO(Orthogonal Frequency Division Multiplexing-Multiple-Input Multiple-Output)technology based on,derived from the beamforming,spatial multiplexing technology,a wireless communication system to improve the information transmission rate,but also to enhance the security of information transmission.However,this also makes the signal intercepted by the noncooperative receiver have the inherent characteristics of weak signal,low signal-to-noise ratio,and strong distortion.Therefore,in the LTE non-cooperative reception mode,research on technologies to enhance reception detection performance has great theoretical and engineering significance.This article mainly researches and discusses LTE noncooperative reception enhancement technology around this application background.The specific research work is as follows:First,a non-cooperative reception enhancement technology based on multiple antennas is proposed.Analyze the non-cooperative receiving system model in beamforming and multi-user MIMO scenarios.In order to solve the problem of weak offbeam non-cooperative receiving signal,low signal-to-noise ratio,and multi-user interference,it is proposed to use multi-antenna technology for non-cooperative reception.The idea of receiving,improved the antenna structure of non-cooperative receivers,and gave a multi-antenna receiving algorithm.The simulation results show that the multiantenna non-cooperative reception technology effectively improves the detection performance of non-cooperative reception compared to the traditional single-antenna non-cooperative technology.Second,a non-cooperative reception enhancement technique based on channel estimation optimization algorithm is proposed.Traditional non-cooperative receivers use the LS(Least Squares)algorithm for channel estimation in the signal detection process.The detection performance is sensitive to noise and has poor performance under low signal-to-noise ratios.This article is based on the DFT(Discrete Fourier Transform)channel estimation algorithm by adding a virtual carrier and time.Two methods of domain noise reduction are optimized to reduce the error of channel estimation results in a low signal-to-noise ratio environment and improve performance.The simulation results show that compared with the LS channel estimation algorithm,there is about 3?5d B performance improvement in a variety of channel environments.Third,a distributed non-cooperative reception enhancement technology based on uplink and downlink decoupling is proposed.In order to solve the problem of the small working range of traditional non-cooperative receivers,this paper proposes a distributed non-cooperative receiving technology with uplink and downlink decoupling to derive and analyze the receiving performance of uplink and downlink extensions.The simulation results show that the distributed non-cooperative receiving structure with decoupling of uplink and downlink can improve the working range.The thesis focuses on enhancing the performance of non-cooperative reception detection under the LTE system.The three proposed reception enhancement algorithms can be applied in engineering practice and have reference significance for technical reconnaissance and other fields.