| Summary: | 碩士 === 中原大學 === 電機工程研究所 === 107 === Abstract
This study proposes a modulation method that uses two chaotic signals combined with single sideband full-carrier (SSBFC) and on-off keying (OOK). This method can be applied to transmit digital signals in the noisy channel. The chaotic signals used are the Van der Pol oscillator and the Lorenz attractor. They are all modulated using SSBFC, where the Van der Pol chaotic signal uses the upper sideband and the Lorenz chaotic signal uses the lower sideband. The digital signal is modulated by OOK, and the modulated chaotic signal is transmitted according to the state of the digital signal. On the receiver side, a low pass filter is used to remove the noise and a decoder is used to recover the original signal. This study uses MATLAB Simulink for simulation. According to the simulation results, this modulation method can improve the transmission security and reduce the distortion caused by noise.
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