Performance Analysis of Multi-hop Parallel Free-Space Optical Systems Over Exponentiated Weibull Fading Channels Optimized By Particle Swarm Optimization

The performance of multi-hop parallel free-space optical (FSO) communication systems with decode-and-forward (DF) protocol over exponentiated Weibull (EW) fading channels has been investigated. Average bit error rate (ABER) and outage probability (OP) performance are analyzed under different turbulence conditions, receiver aperture size and structure parameters (R, C). The ABER and OP for FSO system is derived based on particle swarm optimization (PSO). The ABER and OP performance of the considered systems are investigated systematically combined with Monte Carlo (MC) simulations. The comparison between existing EW fading model and PSO based EW fading channel demonstrates that performance of the both systems could be enhanced by large aperture sizes for the structure parameters R and C. With the PSO optimization, ABER and OP reduction are achieved. The performance of multi-hop parallel FSO communication system for EW, GG (Gamma-Gamma) and LN (Log-normal) fading channels has been studied analytically and numerically with PSO. The ABER performance under EW fading channels has been compared with that of G-G and LN fading channels and analyzed that the EW fading channel model is regarded as an excellent candidate to accurately predict the probability of fade and the BER performance of laser beam propagating through atmospheric turbulence.