Abstract
Aiming at the detection failure of strong noise interference in the dual channel of the dual-sequence frequency hopping (DSFH), the scale transformation stochastic resonance (STSR) is applied for the first time, and the output signal to noise ratio (SNR) is raised effectively, at the same time, the symbol reception is completed for DSFH at low input SNR. Firstly, the radio frequency (RF) and intermediate frequency (IF) signals are analyzed based on the super-heterodyne reception of DSFH; secondly, the equations of probability density function (PDF), output power spectrum and SNR of the STSR output are derived for the IF signal; finally, the algorithm of the optimal matching STSR is proposed with the optimal matching parameters. The simulation results show that the algorithm can effectively solve the detection failure, as the global output SNR of DSFH is strongly improved that the output SNR can reach −17.72 dB when the input SNR is −20 dB after the processing of the optimal matching STSR.
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