Accurate Blind Synchronization for Free Space Optical Communication System Using 2-PPM Modulation

Abstract

In this paper, we propose an accurate technique of synchronization based on blind algorithm for free space optical (FSO) system using binary pulse position modulation (2-PPM). FSO channel is impaired with atmospheric turbulence and pointing errors. Previous works on PPM modulation technique proposed a synchronization algorithm called Timing with Dirty Templates (TDT), which is based on correlations between symbol information. Since this technique is blind-based, it suffers from lack of accuracy in timing detection. Therefore, we proposed an enhanced algorithm which allows more accurate detection and causes lower rates in bit error as well as in mean square error. Our simulation results are valid in different levels of atmospheric turbulences and pointing errors.