Wireless optical communication systems

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Position Accuracy of Time-of-Arrival Based Ranging Using Visible Light With Application in Indoor Localization Systems (2013, background): “Due to this linear relationship, the responsivity is usually taken at the central optical frequency of operation [5].”
LED Based Indoor Visible Light Communications: State of the Art (2015, background): “When switching off, the capacitor helps sweep out the carriers by reverse biasing (13)A converter topology which consists of two inductors which is denoted by ‘L’ and one capacitor denoted by ‘C’, the load is connected in parallel to one of the inductors (14)Noise generated due to the discrete natur”
Physical-Layer Security in Free-Space Optical Communications (2015, background): “Noise (AWGN) with zero mean and variance (2)n, mainly associated to the high intensity shot noise produced by the ambient light, as detailed in [24].”
Capacity Trends and Limits of Optical Communication Networks (2012, background): “theory[ has been applied and adapted to more complex channels such as wireless communication [26]–[33], digital subscriber lines (DSLs) over twisted copper wires [34]– [38], coaxial cables [36]–[39] and the Bphoton channel[ [40]–[45], relevant to deep space and satellite communications [46], [47].”
Survey on Free Space Optical Communication: A Communication Theory Perspective (2014, methodology): “spectral efficiency with respect to binary-level modulations like PPM [215].”