Analysis on frequency diversity and anti-jamming characteristic of TDCS signal

摘要

The idle spectrum can be utilized to avoid the slowly changing jamming in the traditional TDCS (Transform Domain Communication System), but its performance is seriously reduced in the frequency rapidly changing jamming conditions. In order to solve this problem, the soft spectrum spreading effect from CCSK (Cyclic Code Shift Keying) in TDCS signals is analyzed in detail. The frequency diversity characteristic in the signal transmission process is revealed. Therefore the diversity receiving is naturally requested, and a selective combining processing method for the undisturbed subcarriers is proposed. It enhances the anti-jamming ability of the system. The effect on the receiving performance is also analyzed. The simulation results verify the validity of above analysis and the practicability of this method.