Demodulation of QAM signals based on chaotic oscillators

By making use of the chaotic oscillator, a new method of demodulating QAM signal submerged in strong noise is presented. According to the method, the problem of weak digital modulation signal was solved. Duffing system is sensitive to specific signal and immune against the noise. For the fork problem of Duffing oscillator, taken the signal into multiple systems at the same time. Different Systems were sensitive to different tested signals. The signal was changed in a different phase and amplitude. QAM signal was demodulated by judging the system state. The simulation results show that this demodulation method is suitable for demodulating the QAM signal.