Key Technology Research And System Design Of Frequency Hopping Communication

FH(Frequency Hopping)communication is a branch of spread spectrum communication.Because its anti-interference ability and anti-interception ability are obviously superior to other systems,it is widely used in today's civil communication and military fields,and research and improvement of frequency hopping communication technology has become a research hotspot in recent years.Frequency hopping communication can improve the weakening.And the frequency hopping technology can greatly improve the communication quality of mobile stations moving in a multi-path environment,and it has been well applied in the communication field.This thesis focuses on the analysis of key technologies such as frequency hopping sequence,frequency hopping frequency synthesis,frequency hopping synchronization,frequency hopping networking and adaptive frequency hopping in frequency hopping communication.For traditional frequency hopping communication,there are low frequency hopping speed and frequency hopping.Based on the lack of points,an improved scheme based on FH-OFDM is proposed.The MATLAB simulation analysis of frequency hopping communication is carried out.The frequency hopping communication system is designed and implemented by FPGA.Firstly,the principle and key technologies of frequency hopping communication are analyzed,including key technologies such as frequency hopping sequence,frequency hopping frequency synthesis,frequency hopping synchronization,frequency hopping networking and adaptive frequency hopping.The existing deficiencies are analyzed and an improved scheme based on FH-OFDM is proposed.Secondly,the simulation analysis of frequency hopping communication is carried out.The whole process of modulation and demodulation analysis is carried out for the frequency hopping implementation of 2FSK and 4FSK.The improved scheme based on FH-OFDM is simulated and analyzed by Simulink.The performance of the improved solution has been greatly improved.Finally,the FPGA is used to design and implement the frequency hopping communication system.The 2FSK modulation and demodulation of the frequency hopping communication system is designed and implemented.The implementation principle of the FPGA is analyzed and a feasible scheme is designed.At the same time,the frequency hopping sequence generator and synchronization system of the frequency hopping communication system are designed and implemented,including the design of the m sequence generator,the Gold sequence generator and the design of carrier synchronization and symbol synchronization.Then FPGA is used to design and implement the transmitting end andreceiver of the frequency hopping communication system,and the overall design of the frequency hopping communication system is completed.