Abstract
This paper presents an efficient technique to map
phase shift keying (PSK) signalling to colour shift keying (CSK)
constellation, to establish a full link in hybrid systems involving
the radio frequency (RF) and the visible spectrum. It fits in
systems combining (first link) wireless communication technologies
such as the wireless fidelity (WiFi) or wired communication
technologies such as power line communications (PLC) to visible
light communications (VLC) technology (second link). On the
first link, PSK technique is used to convey the information, while,
on the second link, a technique based on colour variation is
deployed. WiFi standards targeted are those that employ PSK
as sub-carrier modulation techniques (IEEE 802.11a/11g/11n).
The PSK complex constellation observed at the output of the
first link is converted into colours using the hue-saturationvalue/
intensity (HSV/I) colour models. The constant lighting
required in VLC corresponds with the coordinate I of the
HSI and the colour constraint is met by assigning adequate
current intensities to the red-green-blue LEDs (RGB-LEDs) used.
The design meets the requirements of CSK constellation design
outlined in IEEE 802.15.7. The performance of the system is
analysed through bit error rate curves obtained by simulations,
for binary PSK (BPSK) and quadrature PSK (QPSK), 8PSK and 16PSK constellations. The results show that as the constellation