Red-shift effect in multi-color LEDs based visible light communication

TUĞCU E., YAZGAN A., ALBAYRAK C., TÜRK K.

OPTICS COMMUNICATIONS, cilt.463, 2020 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 463
  • Basım Tarihi: 2020
  • Doi Numarası: 10.1016/j.optcom.2020.125451
  • Dergi Adı: OPTICS COMMUNICATIONS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, DIALNET
  • Anahtar Kelimeler: Visible light communication (VLC), Color shift keying (CSK), Red-shift effect, Light-emitting diode (LED), MODULATION, SYSTEM
  • Karadeniz Teknik Üniversitesi Adresli: Evet

Özet

Visible light communication (VLC) is a short range wireless optical communication system that provides lighting and data transmission, simultaneously. Besides lighting, in order to obtain high data rates, color-shift keying (CSK) which modulates the intensity of light using multi-color light emitting diodes (LEDs) has been introduced in IEEE 802.15.7 VLC standard. In CSK-based VLC (VLC-CSK) systems, some parameters of LEDs such as junction temperature is affected by physical and operation conditions. Junction temperature variations change the power spectral density (PSD) of LEDs, which is known as red-shift effect. In this study, the red-shift effect is examined for the first-time in VLC-CSK systems. The obtained numerical results show that the red-shift effect may dramatically reduce the performance of optical communication system. To eliminate the negative effect of red-shift, an effective solution based on the power normalization is proposed at the receiver side.