Görünür Işık İletişimi için Yeni Bir Adaptif OFO-OFDM Modülasyonu

Öz

Radyo frekansı teknikleri Geçmişte kablosuz iletişim için konuşlandırılmış ve spektral sıkıntısını ve sınırlı iş hacmini takiben, son derece büyük bant genişliğine sahip görünür ışık spektrumu ve yüksek verimlilik potansiyeli bu çalışmada araştırılmaktadır. Bu çalışma, ağın verimini artırmak için görünür ışık spektrumunda bir sinyal koşullandırma şemasını araştırmayı ve modellemeyi amaçlamaktadır. İletişim verimini etkili bir şekilde artırmak için olası bir çözüm, çoklu taşıyıcı tekniklerini kullanmaktır. Bu çalışmada, Lagrange Multiplier ve Broyden Fletcher Goldfarb Shanno Algorithm (BFGSA) kullanılarak geliştirilmiş verim için uyarlanabilir bir Optimize Edilmiş Ters Optik (OFO) OFDM önerilmiştir. Lagrange Çarpanı tekniği, bit hata oranı (BER) ve toplam alt taşıyıcı iletim gücü ile sınırlandırılan verimin optimizasyonu için modeli formüle etmek için kullanılırken, BFGSA, aşağıdaki hesaplamalar için Hessian matrisine yaklaşımın tahmini için kullanılmıştır. Sonuçlar, geleneksel şemalarla karşılaştırıldığında önerilen algoritmanın lehine gelişmiş spektral verimlilik gösterdi. Diğer doğrulamalar, belirli bir ortalama sinyal-gürültü oranı (SNR) için karşılaştırılabilir çalışma koşulları altında Castel, Wyglinski ve Bedeer algoritmalarıyla karşılaştırıldığında önerilen algoritmanın performans üstünlüğünü ortaya koydu.

Anahtar Kelimeler

• Demodülasyon
• Yoğunluk Modülasyonu
• Modülasyon
• OFDM
• Optik Modülasyon
• Görünür Işık İletişimi

A Novel Adaptive OFO-OFDM Modulation for Visible Light Communication

Öz

Radio frequency techniques have been deployed in the past time for wireless communication and following its spectral crunch and limited throughput, the visible light spectrum with enormously large bandwidth and potentials for high throughput is being investigated in this work. This study is aimed at investigating and modeling a signal conditioning scheme in the visible light spectrum in view of enhancing the throughput of the network. To effectively enhance communication throughput, a possible solution is to deploy multicarrier techniques. In this work, an adaptive Optimized Flipped Optical (OFO) OFDM is proposed for improved throughput using Lagrange Multiplier and Broyden Fletcher Goldfarb Shanno Algorithm (BFGSA). The Lagrange Multiplier technique was used to formulate the model for the optimization of the throughput constrained by the bit error rate (BER) and the total subcarrier transmit power whereas the BFGSA was used for the estimation of the approximation to the Hessian matrix for the computation of the optimal throughput value. Results showed improved spectral efficiency in favor of the proposed algorithm when compared with the conventional schemes. Further validations revealed the performance superiority of the proposed algorithm when compared with Castel, Wyglinski and Bedeer algorithms under comparable operating conditions for a given average signal to noise ratio (SNR).

Anahtar Kelimeler

• Demodulation
• Intensity Modulation
• Modulation
• OFDM
• Optical Modulation
• Visible Light Communication

Kaynakça

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