Study And Implementation Of Key Technologies For High-Speed Frequency-Hopping Systems

Frequency-Hopping (FH) is a novel spread spectrum communication technique, which develops very fast in military field due to its LPI/LPD (Low Probability of Intercept/ Detection) properties, high spectral efficiency and immunity against interferences. FH technique is also widely used civil fields, such as mobile communications, radar, navigation and wireless LAN et al.The high-speed frequency-hopping radio system is studied, and the analysis, design and implementation of hopping synchronization is given in this thesis.Firstly, the hardware platform of high-speed FH radio system is introduced in detail.Secondly, through analyzing several methods to generating hopping sequence, a new scheme for hopping sequence generation is designed with wide interval of hopping and large sequence period based on chaos theory.Thirdly, the key factors in high-speed hopping synchronization are analyzed, and the synchronization problem is simplified into TOD (Time of Day) synchronization. Based on the analysis and comparison of various hopping synchronization approaches, a new synchronization method suitable for high-speed FH communication is introduced, using synchronization wordhead based on TOD information, and the frequency-hopping implementation scheme based on practical hardware platform is given.Finally, the frequency-hopping software programming and corresponding debug are accomplished, and the entire frequency-hopping scheme is realized, and the test results is presented.The dissertation is closed with work summary and pointing out the further research direction, such as engineering implementation considerations.