Evaluation of the Capacity of MIMO-OFDM Free Space Optical Communication System in Strong Turbulent Atmosphere

摘要

In wireless communication Free Space Optical (FSO) communication is an emerging technology to provide high bandwidth and high quality communication. In this work we have evaluated the capacity of the Free Space Optical communication system with Multiple Input Multiple Output (MIMO) Orthogonal Frequency Division Multiplexing (OFDM) technique under strong atmospheric turbulence conditions. The capacity of MIMO-OFDM FSO is evaluated in the presence of Inter symbol Interference (ISI) and is compared with MIMO FSO with ISI. It is found that the effect of ISI is mitigated by using OFDM and the capacity is enhanced. The performance of the system is also compared for Gamma Gamma channel and Negative Exponential channel. It is found that Gamma Gamma channel reduces to Negative Exponential channel in very strong turbulence atmospheric condition.