Open AccessPerformance of M ‐ary quadrature amplitude modulation ‐based orthogonal frequency division multiplexing for free space optical transmission
Author(s) -
Jaiswal Ishu,
Sangeetha R.G.,
Suchetha M.
Publication year - 2016
Publication title -
iet optoelectronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.379
H-Index - 42
eISSN - 1751-8776
pISSN - 1751-8768
DOI - 10.1049/iet-opt.2015.0091
Subject(s) - quadrature amplitude modulation , orthogonal frequency division multiplexing , qam , electronic engineering , cumulative distribution function , transmission (telecommunications) , bit error rate , modulation (music) , probability density function , mathematics , computer science , algorithm , channel (broadcasting) , telecommunications , physics , statistics , engineering , acoustics
In this study, the authors analyse the performance of the free space optical (FSO) transmission link using orthogonal frequency division multiplexing (OFDM) modulation with M ‐ary quadrature amplitude modulation (QAM) encoder. For strong and weak atmospheric attenuation, the analysis of channel distribution in FSO is carried out using gamma–gamma model. In this analysis, the expressions for probability density function and cumulative density function of OFDM‐based FSO channel have been derived in terms of Meijer's G‐function. Also, the bit error rate and outage probability of M ‐ary QAM‐based OFDM for an FSO transmission link has been derived. The feasibility of the system and the derived expressions are verified using Opti‐system and MATLAB. From the analysis, it is observed that the performance of OFDM using M ‐ary QAM modulation is feasible for 7000 m, owning to its simplicity and good performance.