Effect of Air Pollution on OFDM based RoFSO Transmission for Different Dust Conditions

The proposed communication model using OFDM based radio over free space optical (RoFSO) system with WDM multiplexing is implemented. Two different 20Gbps - 60GHz data streams are transmitted at optical carriers of 193.1 THz and 193.3 THz frequency through single channel FSO link. The FSO link performance is analyzed for various dust conditions. The effect of channel attenuation due to size of suspended dust concentration in terms of particulate matter i.e. PM10 and PM2.5 is analyzed. The effect of various atmospheric turbulence conditions under light dust conditions is also considered in the analysis. Eye diagram pattern is observed under different dust conditions and corresponding bit error rate and Q-factor is measured. At detector output, SNR is measured by using spectrum analyzer. Also, electric constellation is observed for PM 10 and PM 2.5 under various dust conditions using constellation visualizer. The channel attenuation due to the combined effect of various dust pollutants and atmospheric turbulence conditions on FSO link is also analyzed.