Hybrid Free-Space Optical and Radio-Frequency Communications: Outage Analysis
This paper studies hybrid Free-Space Optical (FSO) and Radio-Frequency (RF) communications, whereby information is conveyed simultaneously using both optical and RF carriers. The authors consider the case where both carriers experience scintillation, which is a slow fading process, compared to typical data rates. A parallel block-fading channel model is proposed, that incorporates differences in signalling rates, power scaling and scintillation models between the two carriers. Under this framework, the authors study the outage probability in the large Signal-tonoise Ratio (SNR) regime.