Research on Noise Type Covert Transmission Scheme Based on WFRFT
Covert wireless communication aims to realize the hidden transmission of information between the two parties to ensure the security of information.A kind of chaotic spread spectrum noise signal convert communication method based on weighted fractional Fourier transform is proposed.In this method,two different chaotic sequences generated by the improved Logistic mapping are used for symbolic spread spectrum of covert signals,and then weighted fractional Fourier transform is used to generate noise type covert signals.The covert signals will be superimposed on the overt signals by the sender to make simultaneous transmission,and the synchronization problems can be solved by the overt signals.The processed covert signal has the characteristics of low energy and Gaussian-like,which can be well confused with the background noise,and has strong covertness and anti-interception ability.The simulation results show that the proposed method has better convert performances,The symbol error rate of the method is consistent with the theoretical derivation.And when the power ratio is between 0.007 and 0.01,the covert signals and the overt signals can both achieve good symbol error rate.
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