BER Performance Analysis of an OFDM QPSK FSO System Considering AWGN Channel

M.G. Raisa¹ , T. Taher² , J. Naiem³ , T. Islam⁴

1. Dept. of Electrical & Electronic Engineering, Ahsanullah University of Science & Technology, Dhaka, Bangladesh.
2. Dept. of Electrical & Electronic Engineering, Ahsanullah University of Science & Technology, Dhaka, Bangladesh.
3. Dept. of Electrical & Electronic Engineering, Ahsanullah University of Science & Technology, Dhaka, Bangladesh.
4. Dept. of Electrical & Electronic Engineering, Ahsanullah University of Science & Technology, Dhaka, Bangladesh.

Section:Research Paper, Product Type: Journal-Paper
Vol.7 , Issue.1 , pp.1-4, Mar-2020

Online published on Apr 10, 2020

Copyright © M.G. Raisa, T. Taher, J. Naiem, T. Islam . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
FSO is a communication system that uses light to transmit information in free space which acts as a medium between transmitters and receivers. This system is cost effective and easy to install. FSO has many advantages like low bit error rate and immunity to RF interference. The transmission in FSO can be difficult because of physical obstructions, atmospheric turbulence, pointing error, geometric losses, etc. Orthogonal frequency division multiplexing (OFDM) is a modulation technique where data is encoded on multiple sub-carrier frequencies. Despite having problems like peak to average noise ratio, OFDM system has received significant attention due to its high data rates, less intersymbol interference and unlimited bandwidth. A simulation approach is made to analyze the BER and SNR performances. The results are evaluated by MATLAB, thus it can be useful for designing, predicting and evaluating an improved FSO system in the existing communication system. Results are calculated in terms of SNR and BER. If OFDM-QPSK is used instead of other modulation schemes then nearly 6dB gain can be obtained at a bit error rate of 10^-4.

Key-Words / Index Term :
free space optic, quadrature phase shift keying, orthogonal frequency division multiplexing, bit error rate, signal to noise ratio, additive white Gaussian noise

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