Performance Analysis of FSO under Turbulent Channel Using OSTBC

  • Lwaa Faisal Abdulameer Information and Communication Eng. Dep., University of Baghdad, Baghdad, IRAQ
  • Hala Fadhil Information and Communication Eng. Dep., Al-Nahrain University, Baghdad, IRAQ
Keywords: FSO, OSTBC, Gamma-Gamma, MIMO


Free Space Optics (FSO) plays a vital role in modern wireless communications due to its advantages over fiber optics and RF techniques where a transmission of huge bandwidth and access to remote places become possible.

The specific aim of this research is to analyze the Bit-Error Rate (BER) for FSO communication system when the signal is sent the over medium of turbulence channel, where the fading channel is described by the Gamma-Gamma model. The signal quality is improved by using Optical Space-Time Block- Code (OSTBC) and then the BER will be reduced. Optical 2×2 Alamouti scheme required 14 dB bit energy to noise ratio (Eb/N0) at 10-5 bit error rate (BER) which gives 3.5 dB gain as compared to no diversity scheme.

The results show that using Multiple-Input-Multiple-Output (MIMO) technique represented by Alamouti scheme gives the improved BER performance as compared with no diversity (Single-Input-Single-Output (SISO)) technique.

How to Cite
Abdulameer, L., & Fadhil, H. (2018). Performance Analysis of FSO under Turbulent Channel Using OSTBC. Al-Nahrain Journal for Engineering Sciences, 21(3), 344-349.