Patent ID: 11909440
Assignee: SOOCHOW UNIVERSITY
Field: Telecommunications (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 4:
5. A demodulation method for a visible light communication system with adaptive dimming, based on the visible light communication system with adaptive dimming according to claim 3, and comprising:
acquiring, by a third photoelectric sensor and a fourth photoelectric sensor, light signals, and converting the light signals into electrical signals;
gating, by an analog switch, valid signals of visible light signals and infrared signals, and inputting a gating result into a receiver controller;
when the receiver controller detects a change in a modulation order of a gate branch, outputting, by the receiver controller, a corresponding new demodulation order, and demodulating, by an adaptive M-PAM demodulator, the valid signals by using the new demodulation order; when the receiver controller detects no change in the modulation order of the gate branch, demodulating, by the adaptive M-PAM demodulator, the valid signals; and
when the receiver controller detects a light path switching signal, transmitting, by the receiver controller, a switching instruction to the analog switch and the adaptive M-PAM demodulator, the analog switch switching to another light path, and performing, by the adaptive M-PAM demodulator, demodulation by using a demodulation order corresponding to the another light path.