Feasibility Analysis Of Repeater Jamming Based On OFDM System

With the development and change of communication technology and military thinking, communication countermeasure has playing a prominent role.With the advantages of high spectrum efficiency, flexible modulation, anti-multipath interference,Orthogonal frequency division multiplexing (OFDM) technology has been successful applied in different standards, but also becomes the key technology of the fourth generation mobile communication system.So interfering with OFDM system becomes the focus problem in the communication countermeasure. The paper elaborates the principle and structure of the OFDM system and obtains the simulations at differert stages.By studied on the traditional interference methods and the interference methods that used in the OFDM system,it obtains that the traditional interference method have not worked well in OFDM system.On this base,beginning with the cyclic prefix,it gets that if the cyclic prefix is greater than the channel delay,the system has low bit error rate and good quality of communication;in the opposite direction,it has high bit error rate and bad quality through the simulation.Hence the channel delay is greater than the cyclic prefix by increasing the delay so as to interfere with OFDM system.According to the application of repeater jamming in GPS,it elaborates the repeater jamming model,analyses the relevant parameters and simulates the model based on OFDM system.From the simulation figure,it obtains that the quality of communication is bad by increasing the delay,so the repeater jamming works well in OFDM system.