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Notice of Retraction
After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles.
We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.
The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.
Free space optical (FSO) communications is a cost-effective and high bandwidth access technique, which has been receiving growing attention recent yeares. However, the performance of FSO is severely suffers from the turbulence induced fading which severely degrades the link performance. To mitigate turbulence-induced fading and, therefore, to improve the error rate performance, spatial diversity can be used over FSO. In this paper, using OOK intensity modulation/direct detection, we investigate the bit error rate (BER) performance of FSO links with spatial diversity over gamma-gammal atmospheric turbulence fading channels. The atmospheric turbulence effects on the system bit error rate are analyzed. The equal gain combined diversity and optimal gain combined space diversity technology are compared. Results show that the FSO performance can be improved effectively.