Design And Implementation On The Anti-interference Capability Of Receiver And Antenna For Wireless Communication System

Nowadays the application of radio communication is more and more extensive,and more and more fields are involved.The applications in daily life are more and more common,the scale of users is constantly expanding,and the results of wireless communication systems are becoming more and more complicated,Diversification,the spectrum resources of the system are becoming increasingly tight,and the frequency protection interval is gradually narrowing.Under some special circumstances,the signal is vulnerable to external or internal attacks,causing signal interference.Therefore,the research on the anti-interference technology in the process of wireless signal transmission is of great significance to the communication quality,security and reliability.At the same time,we can also find that in this research,the types of interference and targeted solutions have a lot of research results,but for the specific spectrum width is too wide and the problem of limited transmit power,anti-interference performance It is one of the most important indicators in wireless communication.The current communication system has a maximum anti-interference of 20 ~ 30 dB.However,in some very harsh environments,the anti-interference performance usually requires more than 50 dB.This paper analyzes various anti-interference systems and receiver architectures widely used in current communication systems.Also,the common receiver schemes in the industry are introduced,the budget of each scheme is decomposed in this paper.On this basis,the receiver model scheme is selected,and an eight-channel receiver based on superheterodyne structure was designed.Then the receiver indicators are simulated and tested for performance,including out-of-band harmonics,gain and noise,radio frequency circuit,frequency response,and intermediate frequency circuit.The results showed that the design requirements were met;through the switch matrix A PLL that can perform fast frequency hopping is designed,and its lock time is better than the PLL structure of the traditional structure.Finally,the antenna anti-jamming technology is studied.An array antenna and a reconfigurable antenna using a PIN tube as a tunable unit are designed.The antennas were simulated and measured,and tested to meet the design requirements.In order to verify the anti-interference of the overall system,the system calibration wired test and the wireless test were separately conducted.When conducting the wired test,three items were tested: basic test,single In channel test and multi-channel test,when multiple channels are interfered,the anti-interference performance of the system can still reach 60dB;during wireless testing,the situation of four interference sources is analyzed through semi-physical simulation,and the test results show that Its anti-interference ability reaches 60 dB,which meets the requirements.