eng URI http://hdl.handle.net/10795/3092 ασύρματη τηλεπικοινωνία The radio on free space optical (RoFSO) communication systems are gaining popularity due to their high data rates, license free spectrum and adequate reliability at installation and operational costs which are much lower than comparable technologies. A significant disadvantage of these systems concerns the randomly time varying characteristics of the propagation path mainly caused by the turbulence effect. On the other hand, the optical fiber communication systems offer links with higher data rates but with expensive infrastructure and installation cost. In this work, we study the BER performance of an optical communication system which consists of a RoFSO link that is connected with an optical fiber link through a regenerator node. The signal propagates, in both links, using the OFDM technique with QAM format and the dominant impairments which have been taken into account are the atmospheric turbulence, modelled with the negative exponential distribution, the nonlinear responsivity of the laser diode which can be modelled with a Volterra series and the biasing with nonlinear clipping noise. For this setup, closed form mathematical expression for the estimation of system's BER has been derived and the corresponding numerical results are presented for common link parameters. 10 pp. LOMv1.0 creator LOMv1.0 Project Deliverable Number D2.3.4 LOMv1.0 Project Final Beneficiary LOMv1.0 Project Executing Organisation 2014-05-31 Digital Library of the Operational Programme "Education and Lifelong Learning" abstract types Text BER Fiber Optics Free Space Optical Communications Nonlinear Clipping OFDM QAM 399655 application/pdf http://repository.edulll.gr/edulll/bitstream/10795/3092/2/3092_D2.3.4.pdf URI http://hdl.handle.net/10795/3092 LOMv1.0creator 2016-05-10T10:39:03Z LOMv1.0validator 2016-05-10T10:39:03Z LOMv1.0 gre no no Copyright EYD-EPEDBM (Operational Programme "Education and Lifelong Learning")