The Study On MUSIC Spatial Spectrum Estimation And Inverse QR-RLS Technology In Communication Interference

This paper analyses the anti-jamming theory about the cognitive anti-jamming receiver and gives the design.In the paper,a type cognitive interference receiver which developed by our team as the background, QR decomposition,Givens rotation and MUSIC algorithm for the theoretical basis and the combination between adaptive filtering means with the identification of interference direction as means.The main thesis is as follows:This paper described the background of the subject's position title,adaptive filter theory,spatial spectrum estimation theory and the history,current status of the work and summarize the writing routes. In order to make the above theory easy to understand,this paper briefly describes the RLS algorithm, Gives rotation and planar array model.Secondly, the article describes the traditional IQRD-RLS algorithm. To make the algorithm easy to implement, the article has improved the traditional IQRD-RLS algorithm and presents a new IQRD-RLS algorithm. In order to solve the existing large number of prescribing and division operations and the cost of hardware resources which in the IQRD-RLS algorithm, theκλrotation is introduced so that prescribing and division operations to simple addition and multiplication, the hardware cost savings. Both of the uniform linear array and uniform circular array are discussed in each algorithm and given performance simulation of the conclusions and implementation structure.Thirdly, the article introduces the classic MUSIC algorithm. the Root MUSIC algorithm is introduced to solve time-consuming and resource shortcomings when the algorithm to search the whole space. Root MUSIC algorithm figure out the signal and the interference of the incident direction by finding the roots of polynomial.In order to solve the high complexity and the shortcomings of the coherent signal sensitive about the Root MUSIC algorithm, the unitary matrix root-Music algorithm are established. Both of the uniform linear array and uniform circular array are discussed in each algorithm and given performance simulation of the conclusions.Finally, the article is summarized and pointed out further research.