Performance Analysis of a Subcarrier Multiplexed Qpsk Modulated Free Space Optical Mimo Transmission Link through Atmospheric Turbulence

Abstract

Abstract
Free space optical (FSO) communication shows potential technology for communication. But the main weakness is atmospheric turbulence which causes major transmission destruction for an open air optical communication system. In this paper, the performance of free space optical (FSO) is analyzed using subcarrier multiplexed QPSK intensity modulated OFS link with optical intensity modulation and direct detection for a single input single output (SISO) system considering strong atmospheric turbulence. To overcome the effect of atmospheric turbulence, multiple input multiple output (MIMO) communication system is introduced here. The performance results are evaluated and are shown in terms of BER and it is clearly found that performance is considerably improved for a multiple input multiple output (MIMO) system.

Keywords: Free space optical (FSO), Single input single output (SISO), Single input multiple output (SIMO), Multiple input single output (MISO), Multiple input multiple output (MIMO), Quadrature phase shift keying (QPSK)