  In this paper, we investigate the performance of the dual-hop free space
optical (FSO) communication systems under the effect of strong atmospheric
turbulence together with misalignment effects (pointing error). We consider a
relay assisted link using decode and forward (DF) relaying protocol between
source and destination with the assumption that Channel State Information is
available at both transmitting and receiving terminals. The atmospheric
turbulence channels are modeled by k-distribution with pointing error
impairment. The exact closed form expression is derived for outage probability
and bit error rate and illustrated through numerical plots. Further BER results
are compared for the different modulation schemes.
