Performance analysis of FIR based communication in multi user scenario using CSK

This paper offers to analyze the performance and mitigation strategy for multi-user interference (MUI) based line-of-sight (LOS) infrared (IR) communication system in free space optics (FSO). The model is predicated upon the modulation scheme of code shift keying (CSK) in comparison with the conventional on off keying technique (OOK) for the outdoor environment. To interpret the analytical study, in addition to CSK, 20 μm is guaranteed as an operating wavelength for far infrared (FIR) communication purpose. With a power allocation of 1–10 mW, a maximum data rate of greater than $$10^6$$ bps is achieved and the results are obtained in 1000 m distance. The results indicate that the device output is very responsive to the channel model preference. During the case of atmospheric instability, the comparatively unused FIR spectrum has been found to be ideal for external optical communications. The outcomes are illustrated with the consequences on the system due to intrusions and disruption with the FSO waveforms with increasing numbers of users and the performances of signal to noise ratio as well as bit error rate are improved in the turbulence FSO environment.