Research On Four-channel Radiated Interference Adaptive Cancellation Technology

The four-channel radiated interference adaptive cancellation technology studied in this paper comes from the subject-research on co-site coupled strong radiated interference adaptive broadband cancellation technology.In this research project,a four-channel radiated interference adaptive cancellation system model with tap delay is used.Compared with the traditional two-channel radiation adaptive interference cancellation technology,the four-channel radiation adaptive interference cancellation technology improves the cancellation bandwidth to a certain extent,which is expected to solve the problem of broadband signal interference,and the four-channel radiation adaptive interference cancellation system is independent of an additional system other than the receiver and transmitter,which brings great convenience to the use.In addition,the frequency resources are very limited,and the research of the four-channel radiated interference adaptive cancellation technology provides a new and effective way to make full use of the frequency resources.Firstly,the theoretical basis of adaptive interference cancellation technology is introduced: adaptive filter,adaptive interference cancellation principle and adaptive algorithm.The basic principle,structure and typical application scenarios of the adaptive filter are analyzed.Then based on the principle of adaptive interference cancellation,the technology of adaptive interference cancellation based on orthogonal vector synthesis is further analyzed.Finally,the three algorithms most commonly used in the adaptive field are analyzed and compared.Secondly,this paper analyzes the working principle of the four-channel adaptive interference cancellation system in the simulation domain,constructs and solves a weighted differential equation system,and establishes the quantitative relationship among interference cancellation ratio,interference cancellation bandwidth,system gain and tap delay time.In order to facilitate the analysis of the convergence characteristics of the four-channel adaptive interference cancellation system,combined with the error feedback control method,the convergence conditions of the four-channel adaptive interference cancellation system are given.The analytical expressions and influencing factors of the weight convergence speed are analyzed.A method to improve the convergence rate is described in detail.The key factors that affect the system's cancellation performance and its influence law are elaborated in detail,and a method to improve the system's cancellation ratio is given.In order to verify the feasibility of the four-channel adaptive interference cancellation system model used in this paper,a simulation model was built on the Matlab / simulink platform to simulate the four-channel adaptive interference cancellation system,and compared with the traditional two-channel adaptive interference cancellation system analysis.Simulation and analysis show that when the interference signal is a broadband signal,the four-channel adaptive interference cancellation system has a better cancellation effect,that is,the four-channel adaptive interference cancellation system has better broadband cancellation capabilities.