发明名称 |
Optical orthogonal frequency division multiplexing (O-OFDM) system with pulse-width modulation (PWM) dimming |
摘要 |
An optical orthogonal frequency division multiplexing (O-OFDM) system with pulse-width modulation (PWM) dimming includes 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 is 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. A combiner circuit responsive to the current from the driver and the analog output O-OFDM signals is 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 |
申请公布号 |
US9621268(B2) |
申请公布日期 |
2017.04.11 |
申请号 |
US201414894089 |
申请日期 |
2014.06.24 |
申请人 |
Trustees of Boston University |
发明人 |
Elgala Hany;Little Thomas |
分类号 |
H04B10/00;H04B10/04;H04B10/06;H04B10/116;H04L25/49;H04L27/26 |
主分类号 |
H04B10/00 |
代理机构 |
Iandiorio Teska & Coleman, LLP |
代理人 |
Iandiorio Teska & Coleman, LLP |
主权项 |
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. |
地址 |
Boston MA US |