Title: Performance improvement of hybrid OFDM-FSO system using modified OFDM receiver

Authors: Chinmayee Panda; Urmila Bhanja

Addresses: Department of Electronics and Telecommunication Engineering, IGIT, Sarang, Odisha, 759146, India ' Department of Electronics and Telecommunication Engineering, IGIT, Sarang, Odisha, 759146, India

Abstract: Recently, free-space optical (FSO) communication systems have enlarged research and gained popularity because of its inherent advantages. The orthogonal frequency division multiplexing (OFDM) technique helps to improve the performance of the FSO communication system by using a simultaneous multi-carrier transmission scheme. The performance of the hybrid FSO-OFDM system is dependent on different parameters such as the number of sub-carriers, the nature of the laser beam, applied base band modulation, and atmospheric turbulence conditions etc. In this work, a modified OFDM receiver is proposed that improves the bit error rate (BER) significantly. This paper analyses the performance of the FSO communication system by using the proposed modified OFDM receiver over Gamma-Gamma fading channel under different weather and atmospheric turbulence conditions. Simulation results exhibit a significant improvement in the BER performance compared to the existing OFDM receivers for the FSO communication system.

Keywords: OFDM-FSO hybrid link; Gamma-Gamma distribution; modified OFDM receiver.

DOI: 10.1504/IJSCC.2021.116756

International Journal of Systems, Control and Communications, 2021 Vol.12 No.3, pp.227 - 242

Received: 07 Jul 2020
Accepted: 22 Jul 2020
Published online: 01 Aug 2021 *

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