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Abstract--The availability of Channel State Information (CSI) at the receiver side of a Free Space Optical (FSO) link is required
 

Summary: Abstract-- The availability of Channel State Information (CSI) at
the receiver side of a Free Space Optical (FSO) link is required
for optimal detection and diversity combining. Consequently,
providing instantaneous CSI knowledge introduces challenges to
receiver design and an increase in estimation error and
bandwidth waste. In this work we investigate two selection-
combining diversity schemes and their achieved gains when
perfect instantaneous CSI is not available. An average SNR
estimation value at the receiver is used for branch selection, and
signal combining is performed with branch balance and
unbalance. Channel fading is modeled as a lognormal
distribution with spatially correlated samples. BER performance
and outage probabilities are analytically characterized. Further,
analytical results are verified using computer simulation.
Index Terms-- Free Space Optics (FSO), Channel state information
(CSI), Spatial diversity, Selection combining (SC), Equal gain
combining (EGC), Correlated channel.
I. INTRODUCTION
Space diversity has been widely investigated in the
literature and includes several analytical reports assuming

  

Source: Atiquzzaman, Mohammed - School of Computer Science, University of Oklahoma

 

Collections: Computer Technologies and Information Sciences