Research On Narrowband Interference Suppression Technology For Spread Spectrum Communication

In the current wireless communication system,direct sequence spread spectrum(DSSS)is widely used,which has a certain processing gain,which is the main factor of anti-jamming capability.Narrowband interference is the most common interference in communication systems.If the interference intensity is very large and the characteristics are complex,and the processing gain can not be solved by itself,the whole system is difficult to work.So how to introduce narrowband interference suppression technology into the system and enhance the anti-interference ability of the system is one of the most important technologies of DSSS,which has great development space and prospect in the future.According to the above,the main research is as follows:(1)This paper introduces a simple model of DSSS communication system,analyzes the whole process of signal processing,and illustrates the relationship between processing gain and anti-jamming ability.On this basis,the most common narrowband interference in the system is described,and the anti-jamming ability of spread spectrum communication system is analyzed.(2)According to the system model and Time Domain Narrowband Interference on the change of inhibition technology,and design the prediction technology of frequency domain and time domain,the narrowband interference is different,the design technology is also different,and conducts the simulation research and performance comparison for different design techniques.(3)Aiming at the shortcomings of the traditional filter,the prediction filter structure with variable tap spacing is designed.The improved filters under different narrowband interference are studied and compared.(4)According to the time and frequency domain comparison extremely improved performance simulation,the anti-jamming requirements and available resources,using 7 order time variable tap interval method to adapt linear prediction filter to Suppress Narrowband interference.At the same time the system test and adjustment,the results obtained and theoretical analysis consistent.The results of this study show that the predictor improved the anti interference ability of the system,which is the prediction of the effective use of filters in practice.