Light source dimming method based on OFDM signal

The invention relates to a light source dimming method based on an OFDM signal. Interference control is conducted on the 'on' stage and the 'off ' stage of a light source in the strobe process of the LED light source through multi-pulse position modulation signals, so that dimming of the LED light source is achieved, the effect and the accuracy of dimming for the LED light source are effectively improved, the traditional method that a PWM signal is used for dimming is replaced, as a result, the problems that the dimming bit error ratio is high and the power utilization ratio is low are solved, and the dimming performance is improved.