Abstract
This article reviews the recent investigations on improving modulation designs for visible light communication (VLC) systems subject to signal-dependent noise (SDN). The existence of signal-dependent noise degrades the system performance and leads to modulation deficiency issues due to the constellation distortion caused by the SDN. For single-carrier systems, a joint constellation and threshold design was recently proposed to compensate the SDN, and it is re-analyzed in this article together with an improved design criterion based on the rotated minimum Euclidean distance (MIN-ED) that was employed to enhance modulation efficiency in multi-carrier systems. These design criteria are further ameliorated by optimizing the distance-range. Performance comparisons between improved and MIN-ED-based designs for VLC-SDN systems under communications and lighting constraints are also presented to illustrate the major limitations of current modulations. This article concludes with critical implementation challenges and future research opportunities.
| Original language | English |
|---|---|
| Article number | 9112737 |
| Pages (from-to) | 26-32 |
| Number of pages | 7 |
| Journal | IEEE Communications Magazine |
| Volume | 58 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - May 2020 |
| Externally published | Yes |