@article{article_582283, title={Double Quadrature Spatial Intensity Modulation for Visible Light Communications}, journal={Avrupa Bilim ve Teknoloji Dergisi}, pages={905–914}, year={2019}, DOI={10.31590/ejosat.582283}, author={Çelik, Yasin}, keywords={Alt-taşıyıcılı yoğunluk modülasyonu,Uzaysal modülasyon,ÇGÇÇ,GIH}, abstract={<p style="color:rgb(51,51,51);font-size:11.34px;text-align:justify;"> <span style="font-size:10pt;line-height:115%;font-family:’Times New Roman’, serif;">In
this paper, a new spectrally efficient space modulation technique, which is
called double quadrature spatial intensity modulation (DQSIM), is proposed for
multiple-input multiple-output (MIMO) visible light communication (VLC)
systems. Sub-carrier intensity modulation (SIM), which ensures the use of in-phase/quadrature
(I/Q) signals in intensity modulation direct detection (IM/DD) systems, is used
as a digital modulation scheme. In RF, quadrature spatial modulation (QSM)
transmits the I/Q signals through single or multiple antennas selected independently
from each other. Furthermore, the orthogonality between I and Q components is provided
for the half period of sinusoids. DQSIM utilizes these two features and
transmits four fold more bits than spatial modulation (SM) via spatial
constellation. SIM uses two-fold bandwidth compared to on-off keying (OOK),
while DQSIM uses three fold. </span> <span style="font-size:10pt;line-height:115%;font-family:’Times New Roman’, serif;color:#000000;">DQSIM
outperforms benchmark modulation schemes, which are SIM-SM and PAM-SM, at the
BER value of 10 <sup>-4 </sup>. Furthermore, DQSIM performance has increased with
increasing number of LEDs. </span> <br /> </p>}, number={16}, publisher={Osman SAĞDIÇ}