Abstract:

A new method combining the multi-terms weighted-type fractional Fourier transform (MWFRFT) and the transform domain communication system (TDCS) is put forward to improve the security of communication. Firstly, MWFRFT for sequence is used to process the original signals. Then chaos mapping is used to generate the pseudorandom phases of the basis function in TDCS. Finally, the basis function is modulated by MWFRFT signals in the covert communication. In order to show the accuracy of this method, the transformation of constellation and the correlation performance are simulated and analyzed. The result shows that MWFRFT has the diffusion and confusion property of constellation, and the new basis function has better correlation performance, so the method is suitable for covert communication.