Improved ABER Performance of FSO Communication Systems with Soft Decision Decoding of TAEC Code

Abstract

Beyond 5th-generation (B5G), free space optical (FSO) communication systems
are assumed to be the standard for cellular communication due to the oversaturation
of conventional RF bands and the FSO’s unique capabilities. The
communication research community gains access to new opportunities by utilizing
an error control coding scheme in FSO. In this article, we have contributed
for improving the physical layer performance of the fundamental FSO link by
employing the proposed triple-bit adjacent error correcting (TAEC) code with
maximum likelihood- soft decision decoding (ML-SDD). The quality outcomes of
such systems are purely weather-dependent; the Gamma-Gamma statistical distribution
technique has been considered to address the severity of the atmospheric
turbulence (AT) in the propagation path. A new and accurate mathematical
framework has been derived for the average bit error rate (ABER) of the FSO
communication system to examine and compare the performance of the uncoded-
FSO (U-FSO) and coded- FSO (C-FSO) links. The proposed (9, 3) TAEC code
which is proficient of correcting single-bit error, double-bit and triple-bit adjacent
errors has been incorporated during our investigation. It has been observed
that proposed TAEC coding method have a substantial impact on the enhancement
of ABER. Additionally, the results of a Monte Carlo simulation have been
exploited to confirm the veracity of the analytical findings.