Application Research Of LDPC In Free Space Opticl

Free Space optical, communicating with the laser beam transmitting in the space as its carrier, has the respect advantages of optical communication and wireless communication. It has a huge information capability, narrow transmitting beam, excellent orientation, small aerial size and vigorous capability of anti-electromagnetism interference. Free Space optical is free of application for permit of frequency resource, has the features of low expenses in setup and maintenance of the network and quick setting up of the loop. It is free of loop lease expenses. Free Space optical shows a great expectation. All of the main countries in the world are researching expressly on it, hoping to climb to the summit of free space optical technology.The channel of free space optical is the free space. So it is easily influenced by outside, especially such influences caused by rain and fog will make the channel loss and background noise changed greatly, a very serious problem to the telecommunication quality. It is very important to research and develop the coding and modification technology of high speed, which has the feature of highly anti-interference.LDPC has the ability to reach Shannon limit. It shows a great expectation in appliance for reliable information transmitting because of its...