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.
The optical channel models for airborne submarine laser communication are built and the received energy is discussed.
In this propagation channel, sea has the most important impact on the power attenuation. Applying the classical electron
scattering theory to the photo scattering effects in the sea, the transmission delay of underwater laser pulse is investigated
by small-angle approximation theory, caused by the scattering effects in the sea. To indicate the influences of the
seawater properties on the transmission delay, some interrelated curves are displayed. The multi-path time spreading of
signal pulse is studied. The waveform of received signals in receiver in submarine laser communication system is
analyzed and simulated by use of Monte Carlo simulation. The results deduced by using Monte Carlo coincide with that
simulated by using small-angle approximation theory.