Fig 1.
Synchronization error curve and waveform.
For (a) synchronization error, for (b) synchronized waveform of x1 − y1.
Fig 2.
Chaotic secure communication optimization circuit schematic.
Fig 3.
Chaotic phase diagram with Multisim.
(a) xy phase diagram, (b) xz phase diagram, (c) zy phase diagram.
Fig 4.
Waveforms of input sine wave with amplitude of 1 V and frequency of 1 kHz.
(a) transmitting and receiving waveform, (b) synchronous phase diagram, (c) superimposed signal waveform, (d) carrier signal waveform.
Fig 5.
Waveforms of input sine wave with different amplitude.
(a) 10 mV, (b) 100 mV, (c) 5 V, (d) 10 V, (e) 13 V, (f) synchronous phase diagram of 13 V, (g) 15 V, (h) phase diagram of 15 V.
Fig 6.
Waveforms of input sine wave with different frequency.
(a) 10 Hz, (b) 10 kHz, (c) 100 kHz, (d) phase diagram of 100 kHz, (e) 500 kHz, (f) phase diagram of 500 kHz.
Fig 7.
Analog multiplier of receiving circuit with 0.1% error.
(a) transmitting and receiving waveform, (b) phase diagram.
Fig 8.
Analog multiplier of receiving circuit with 1% error.
(a) transmitting and receiving waveform, (b) phase diagram.
Fig 9.
Capacitor of receiving circuit with 1% error.
(a) transmitting and receiving waveform, (b) phase diagram.
Fig 10.
Operational amplifier of receiving circuit with 1% error.
(a) transmitting and receiving waveform, (b) phase diagram.
Fig 11.
Experimental improvement circuit schematic.
Fig 12.
(a) attractors for transmitter, (b) attractors for receiver, (c) x waveform, (d) y waveform, (e) z waveform, (f-h) non-synchronization phase diagram, (i) modulation-demodulation phase diagram, (j) modulation signal and demodulation signal, (k) the power spectrum of the transmitted signal and the recovered signal.
Fig 13.
Chaotic secure communication circuit signal photos.
(a) xy phase diagram, (b) xz phase diagram, (c) zy phase diagram, (d-f) non-synchronization phase diagrams, (g-i) synchronization phase diagrams, (j) signal and channel waveform, (k) signal and channel waveform, (l) modulation-demodulation signal amplification, (m) transmitting and receiving waveform.
Fig 14.
The transmitter input modulation signal and the receiver demodulation output signal.
Fig 15.
Experimental circuit board photo.