Performance Enhancement of FSO System using Modified Exponentiated Weibull Channel Model

Abstract

Background: In free space optics (FSO) communication system, turbulence in the atmosphere leads to the intensity fluctuations of the received signal at the receiver end. Due to this reason, the performance of the free space optical communication system gets affected and results in fading of the received signal. Objectives: Performance improvement of FSO system using sophisticated channel modelling and fading mitigation techniques. Methods: This paper presents the performance improvement of the FSO system using a modified Exponentiated Weibull (MEW) channel model. Moreover, the performance of the FSO system is compared using different channel models such as Gamma-Gamma and Exponentiated Weibull. Results: The results in bit error rate (BER) with respect to different signal to noise ratio (SNR) are obtained using MEW, Gamma-Gamma, and Exponentiated Weibull channel models. In addition, BER is calculated for different aperture sizes such as 1.8, 5, and 13 mm using the proposed channel model to improve the performance of the FSO system. Similarly, the relay assisted technique is utilized to calculate the BER using the proposed channel model. Conclusion: An improvement of free space optical communication system is presented in terms of fading using channel modelling at different atmospheric turbulence conditions. An appropriate channel model is proposed for improving the performance of the FSO communication system using fading mitigation techniques. The proposed MEW channel model best describes the strong atmospheric turbulence induced fading. In addition, the performance of the free space optics system is improved using fading mitigation techniques such as aperture averaging and relay assisted FSO system.