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Error Performance of Coded BPSK OFDM-FSO System under Atmospheric Turbulence

Bukola D. Ajewole 1, Pius A. Owolawi 2, Viranjay M. Srivastava1
1. University of Kwazulu-Natal, Durban, 4001, South Africa
2. Tshwane University of Technology, Pretoria ,0001, South Africa
Abstract—Free Space Optical (FSO) communication system is one of the emerging technologies for use in future broadband networks, due to its high bandwidth efficiency when compared with Radio Frequency (RF) technology. However, atmospheric turbulence is a major factor impairment that degrades the performance of the FSO systems. As a result of this, Orthogonal Frequency Division Multiplexing (OFDM) has been considered as a tool to enhance the performance of the system. In this work, the authors investigate the performance of Binary Phase Shift Keying (BPSK) OFDM-FSO over the Gamma-Gamma turbulence channel. and Forward Error Correcting (FEC) codes are utilized to improve the error performance of the concerned system. The FEC codes used in this work are Convolutional code, Reed-Solomon codes and Turbo code. The results show that the coded BPSK offers a better performance over the uncoded BPSK. It has been shown that Turbo code significantly improve the system error performance compared with other FEC techniques under the same turbulence conditions and link distances considered.

Index Terms—Orthogonal Frequency Division Multiplexing (OFDM), Free Space Optical communication (FSO), Binary Phase Shift keying (BPSK), Forward Error Correction (FEC), Reed Solomon codes (RS).


Cite: Bukola D. Ajewole, Pius A. Owolawi, and Viranjay M. Srivastava, “Error Performance of Coded BPSK OFDM-FSO System under Atmospheric Turbulence,” vol. 14, no. 10, pp. 936-944, 2019. Doi: 10.12720/jcm.14.10.936-944.

 
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