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BER Performance of Free-Space Optical Transmission with Spatial Diversity

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3 Author(s)
Navidpour, S.M. ; Pennsylvania Slate Univ, University Park ; Uysal, M. ; Kavehrad, Mohsen

Free space optical (FSO) communications is a cost-effective and high bandwidth access technique, which has been receiving growing attention with recent commercialization successes. A major impairment in FSO links is 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 links which involves the deployment of multiple laser transmitters/receivers. In this paper, we investigate the bit error rate (BER) performance of FSO links with spatial diversity over log- normal atmospheric turbulence fading channels, assuming both independent and correlated channels among transmitter/receiver apertures. Our analytical derivations build upon an approximation to the sum of correlated log-normal random variables. The derived BER expressions quantify the effect of spatial diversity and possible spatial correlations in a log-normal channel.

Published in:

Wireless Communications, IEEE Transactions on  (Volume:6 ,  Issue: 8 )

Date of Publication:

August 2007

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