Convolutional Coded On - Off Keying Free - Space Optical Links over Fading Channels

  ijett-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
© 2013 by IJETT Journal
Volume-4 Issue-5                      
Year of Publication : 2013
Authors : G.Mounika , Ms.K.Sudha


G.Mounika , Ms.K.Sudha. "Convolutional Coded On - Off Keying Free - Space Optical Links over Fading Channels". International Journal of Engineering Trends and Technology (IJETT). V4(5):1918-1923 May 2013. ISSN:2231-5381. published by seventh sense research group.


The performance of Free Space Optical (FSO) systems reduces due to the presence of turbulence and misalignment effects. In this paper, we investigate the error control coding schemes as a candidate solution to mitigate turbulence and misalignment induced fadings over free space optical links. we have investigated for first t ime the error performance for coded on - off keying (OOK) optical wireless communication systems assuming intensity modulation/direct detection(IM/DD) represented by strong turbulence and pointing error effects. Specifically, we consider various combinations of channels assuming the existence of turbulence and/or pointing error effects and derive exact mathematical expressions for the pairwise error probability (PEP). By using this expressions upper bounds on the bit error rate (BER) are obtain using the tran sfer function technique. Then we calculate the error performance by using the pulse position modulation with different fading channels.


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Free space optical communications, atmospheric turbulence channel, pairwise error probability, error performa nce analysis.