İçortam Görünür Işık Haberleşme Kanallarında Güç Analizi

Öz

Optik kablosuz haberleşme teknolojisi, radyo frekansı iletişiminin önemli bir alternatifi olarak ortaya çıkmıştır. RF iletişimdeki bandgenişliğinin sınırlı olması nedeniyle, kullanıcıların yüksek hızlı kablosuz iletişim sistemlerine olan ihtiyacı artmaktadır. RF sisteminin kontrolsüz radyasyon, sınırlı bandgenişliği, düzenlenmiş frekans ve mobil kullanıcı sayısının artması gibi birtakım kısıtlamaları nedeniyle, RF tabanlı iletişim son yıllarda spektrum darlığı sorunuyla karşı karşıya kalmıştır. RF’ten farklı olarak görünür ışık haberleşmesi (VLC), iletim kanalları için görünür ışık spektrum tayfında daha yüksek frekans bantları tercih edilir. Band genişliği avantajı nedeniyle VLC için görünür ışık frekans bandı kullanılmakta, bu sayede yüksek aktarım hızı ve elektromanyetik girişime dayanıklı olduğu için büyük avantaj sağlanmaktadır. Bu açıdan optik kablosuz iletişim, yeni nesil kablosuz iletişim sistemleri için umut verici bir çözüm olarak değerlendirilmektedir. Bu çalışmada VCL sistemlerinin tek dallı doğrudan görüş (Line-of-sight, LOS) düz sönümlü kanallarda güç analizi incelenmiş, kanal darbe cevabı ve optik güç dağılımları analiz edilmiştir.

Anahtar Kelimeler

• Görünür Işık Haberleşmesi
• Optik Kablosuz İletişim
• Güç Analizi

Power Analysis for Indoor Visible Light Communication Channels

Abstract

One of the most important alternative techniques for radio frequency communications is optical wireless communication technology. Due to the RF bandwidth limitation, the need for high speed wireless communication systems has been increasing in recent years. Due to the limitations of the RF system such as uncontrolled radiation, limited bandwidth, regulated frequency, and the increase in the number of mobile users, RF-based communication has faced a serious spectrum problem in recent years. Visible light communication (VLC) uses higher frequency bands in the visible light spectrum for the transmission medium. Considering the visible light spectrum due to its bandwidth advantage, VLC is advantageous as it offers high transmission speed and strong resistance to electromagnetic interference. In this respect, optical wireless communication is considered as a promising solution for new generation wireless communication systems. In this paper we investigate channel impulse response and power analysis of VLC systems over single-tap Line-of-sight (LOS) flatfading channels.

Keywords

• Visible Light Communications
• Optical Wireless Communication
• Power Analysis

Kaynakça

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