Patent ID: 9621268
Date: 2017-04-11
CPC Classifications: H04B,H04L

Claim:
1. An optical orthogonal frequency division multiplexing (O-OFDM) system with pulse-width modulation (PWM) dimming, the system comprising: a driver responsive to one or more predetermined dimming set points configured to generate PWM signals having a predetermined duty cycle and configured to supply current to one or more light emitting diodes (LEDs); an O-OFDM generator responsive to the one or more predetermined dimming set points and digital data configured to generate digital inverted O-OFDM signals during on-states of the PWM signals and non-inverted O-OFDM signals during off-states of the PWM signals according to the predetermined duty cycle and convert the digital inverted O-OFDM signals and the digital non-inverted O-OFDM signals to analog output O-OFDM signals; and a combiner circuit responsive to the current from the driver and the analog output O-OFDM signals configured such that the analog output O-OFDM signals modulate the current to the one or more LEDs to provide a high capacity visible light communication link.