TY  - JOUR
T1  - Double Quadrature Spatial Intensity Modulation for Visible Light Communications
TT  - Görünür Işık Haberleşmesi için Çift Dördün Uzaysal Yoğunluk Modülasyonu
AU  - Çelik, Yasin
PY  - 2019
DA  - August
DO  - 10.31590/ejosat.582283
JF  - Avrupa Bilim ve Teknoloji Dergisi
JO  - EJOSAT
PB  - Osman SAĞDIÇ
WT  - DergiPark
SN  - 2148-2683
SP  - 905
EP  - 914
IS  - 16
LA  - en
AB  - Inthis paper, a new spectrally efficient space modulation technique, which iscalled double quadrature spatial intensity modulation (DQSIM), is proposed formultiple-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 usedas a digital modulation scheme. In RF, quadrature spatial modulation (QSM)transmits the I/Q signals through single or multiple antennas selected independentlyfrom each other. Furthermore, the orthogonality between I and Q components is providedfor the half period of sinusoids. DQSIM utilizes these two features andtransmits four fold more bits than spatial modulation (SM) via spatialconstellation. SIM uses two-fold bandwidth compared to on-off keying (OOK),while DQSIM uses three fold. DQSIMoutperforms benchmark modulation schemes, which are SIM-SM and PAM-SM, at theBER value of 10-4. Furthermore, DQSIM performance has increased withincreasing number of LEDs.
KW  - Subcarrier intensity modulation
KW  - Spatial modulation
KW  - MIMO
KW  - VLC
N2  - Bu çalışmada, çift dördün uzaysal modülasyon (ÇDUM) adı verilen izgeselverimi yüksek yeni bir uzaysal modülasyon tekniği çoklu-giriş çoklu-çıkış(ÇGÇÇ) görünür ışık haberleşmesi (GIH) sistemleri için önerilmiştir. Sayısalmodülasyon planı olarak, eş evreli (I) ve dördün (Q) sinyallerin yoğunlukmodülasyonlu direk sezim (YM/DD) sistemlerde kullanımına olanak sağlayan,alt-taşıyıcılı yoğunluk modülasyonu (AYM) kullanılmıştır. Radyo frekans (RF)haberleşmesinde dördün uzamsal modülasyon (DUM) I/Q sinyallerini her biridiğerinden bağımsız olarak seçilmiş antenlerden iletir. Dahası I/Q sinyalleriarasındaki diklik sinüzoidal sinyallerin yarım periyodunda da korunmaktadır.ÇDUM bu iki özelliği kullanarak uzamsal modülasyonun (UM) dört katı biti uzaysalboyutta iletir. AYM, aç-kapa anahtarlamaya (AKA) kıyasla iki kat bant genişliğikullanırken, ÇDUM üç kat kullanır. Bu çalışmada ÇDUM performansı AYM-UM ve darbegenlik modülasyonlu uzaysal modülasyon (DGM-UM) ile karşılaştırılmış ve dahaiyi bir performans sergilediği gösterilmiştir. Ek olarak, verici taraftaki LEDsayısı arttıkça ÇDUM performansı artmaktadır.
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UR  - https://doi.org/10.31590/ejosat.582283
L1  - https://dergipark.org.tr/en/download/article-file/792723
ER  -