Polarization shift keying based relay-assisted free space optical communication over strong turbulence with misalignment

• PolSK based parallel relay-assisted FSO system is considered under strong turbulence with pointing errors.
• A Novel Expression for outage probability is derived and analyzed.
• Effect of SNR and strong turbulent eddies on parallel relay-assisted FSO system performance are analyzed.
• The outage results are compared with already exist OOK modulation technique.

This paper investigates the outage performance of polarization shift keying (PolSK) based multihop parallel relay assisted free space optics (FSO) system over a strong atmospheric turbulence channel with misalignment fading. An exact closed form expression is derived for the end-to-end outage probability of the system. The results are compared with the direct transmission and on-off keying (OOK) based FSO systems. The results indicate that the performance of the PolSK based relay-assisted FSO system is much better than the direct transmission and OOK systems. The outage performance is enhanced by increasing the number of relay path between the transmitter and receiver.