Research And Realization Of An Algorithm For Narrowband Interference Suppression In Spread Spectrum System

The main objectives of this thesis are research and FPGA realization of an algorithm for narrowband interference suppression in Direct Sequence Spread Spectrum (DS-SS) system. The thesis began with the analysis of the function to suppress narrowband interference in original DS-SS system. With the software simulation, an adaptive trap filter was introduced into the system. The research and realization of the blind LMS algorithm was investigated, it was indicated that the performance of narrowband interference suppression of the advanced system was improved obviously.The structure of this thesis is as follows: introducing the principle of suppressing narrowband interference in DS-SS system; building the"DS-SS & adaptive trap filter"model, selecting an appropriate modulation type, analyzing and simulating several adaptive algorithms; fulfilling the FPGA design of the LMS adaptive trap filter.