Abstract
We propose an optical power domain non-orthogonal multiple access (OPD-NOMA) scheme for visible light communications. OPD-NOMA superposes user messages in the optical power domain based on a light-emitting diode (LED) array. The maximum driven current for respective circuits is reduced compared to that of conventional NOMA, in which the LED-array-module is driven by a single circuit. OPD-NOMA reduces the gain and bandwidth requirements for the driver circuit of light source. The nonlinear power-current response of LED largely restricts its usable dynamic range and thus the transmit power. In OPD-NOMA, signals with lower powers suffer from reduced nonlinear distortion. The experimental results show that, OPD-NOMA offers improved transmission performance compared to conventional NOMA using the same driver circuit, since it can make a better use of the linear dynamic range of the LED’s power-current response.
| Original language | English |
|---|---|
| Pages (from-to) | 1260-1263 |
| Journal | IEEE Wireless Communications Letters |
| Volume | 8 |
| Issue number | 4 |
| Early online date | 30 Apr 2019 |
| DOIs | |
| Publication status | Published - 21 Aug 2019 |
Keywords
- Visible light communications (VLC)
- successive interference cancellation (SIC)
- Non-orthogonal multiple access (NOMA)