I did receive the paper. I am not fully convinced that the results are correct.
The range of the FSO channel used in the paper is 1m, which is not possible in this component. in addition to my original point about coherence of light produced by LED would not support QAM where phase between in-phase and quadrature is very important. Algorithms in the DSP are used to correct for that.
Could you please communicate with me through my email ahmad.atieh@optiwave.com?
Regards,
Ahmad