Pre-eşitlenmiş UVLC bağlantılarının eski lognormal türbülans kanalları üzerindeki performans değerlendirmesi

Abstract

Su altı görünür ışık iletişimi (UVLC), dalgıçtan dalgıca bilgi paylaşımı, petrol sahası keşfi, liman güvenliği, su altı gözetim sistemleri ve çevresel izleme gibi çeşitli su altı uygulamaları için önemlidir. Ancak, UVLC bağlantılarının su altı optik türbülansından (UOT) büyük ölçüde etkilendiği unutulmamalıdır. Bu durum, solma etkilerini azaltmak için mevcut kanal durumu bilgisine (CSI) dayalı olarak iletim gücünde sık sık ayarlamalar yapılmasını gerektirebilir. Dalgıçtan dalgıca bağlantılar gibi bazı uygulamalarda, iletim ve/veya alıcı düğümlerin yarı sabit pozisyonlarından kaynaklanan iletim çerçeveleri arasındaki kanal katsayısındaki yarı statik değişiklikler, iletim gücü seçiminin eski kanal verilerine dayanmasına yol açabilir. Bu çalışmada, iletim gücünün ayarlanmasında eski kanal bilgilerinin kullanılmasının hata oranı performansındaki bozulmayı araştırıyoruz. Özellikle, eski lognormal türbülans kanalları üzerinden önceden eşitlenmiş bir UVLC bağlantısı için bit hata oranı (BER) için kapalı formda bir ifade türetiyoruz. Türettiğimiz ifadeyi Monte Carlo simülasyonları kullanarak doğruluyoruz.

Keywords

• Sualtı görünür ışık iletişimi
• optik türbülans
• dalgıçtan dalgıca iletişim
• eski lognormal türbülans kanalları.

Performance evaluation of pre-equalized UVLC links over outdated lognormal turbulence channels

Abstract

Underwater visible light communication (UVLC) is important for various underwater applications, including diver-to-diver information sharing, oil field exploration, port security, underwater surveillance systems, and environmental monitoring. However, it should be remembered that UVLC links are strongly affected by underwater optical turbulence (UOT). This may necessitate frequent adjustments in transmit power based on current channel state information (CSI) to mitigate fading effects. In some applications, such as diver-to-diver links, the quasi-static variations in the channel coefficient between transmission frames—attributable to the semi-fixed positions of the transmitting and/or receiving nodes—lead to practical implementations of the transmit power selection that may rely on outdated CSI. In this paper, we investigate the degradation in error rate performance caused by the use of outdated channel information in setting transmit power. Especially, we derive a closed-form expression for the bit error rate (BER) for a pre-equalized UVLC link over outdated lognormal turbulence channels. We verify the derived expression using Monte Carlo simulations.

Keywords

• Underwater visible light communication
• optical turbulence
• diver-to-diver communication
• outdated lognormal turbulence channels.

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