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Abstract In this chapter, we developed numerical expressions for the average symbol error rate, and the Pout of an FSO system with M-ary ASK modulation scheme operating over Málaga turbulent channel with nonzero boresight pointing error. The effects of the boresight components of the pointing error were taken into consideration. Furthermore, we derived asymptotic and approximation formulas for the average SER and the Pout. The expressions have been validated by the solution of the exact formulas. Moreover, the power of Málaga distribution was highlighted by the mathematical derivation of its lognormal, K-truculence and gamma-gamma special cases. Numerical analysis results illustrated the effect of the nonzero boresight pointing error severity and the atmospheric turbulence conditions severity on the system performance.. |