The serious impact produced during the laser transmission in the atmospheric channel will degrade the performance
of the communication system. Channel coding techniques can greatly improve the atmospheric channel. The low density
parity check code (LDPC) is one of channel codes with excellent performance. we applied the LDPC code in the wireless
optical communication system, built the model of the system, simulated and analyzed the application, and proved the
improvement of the performance of wireless optical communication finally.
With the avalanche photodiode (APD) as the receiver, we have studied the timing error influence on performance of the
optical pulse PPM system after analyzing the channel model of the atmospheric laser communication, and respectively
obtained the relationship between the normalized timing error and PWE in the strong and weak turbulent environment. In
addition, we obtained the influences of parameters such as the scintillation index, APD average gain and the levels of
PPM modulation on performance of the optical pulse PPM system by simulation when there are timing errors in the
system.
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