Channel Coding Research Of Wireless Optical Cdma

For the advantages of high data rate, good security, anti-electromagnetic jamming, small volume and little weight etc., wireless optical communications has attracted many countries attention. They have put much manpower and material resources in development of wireless optical communications. That CDMA technology used in wireless optical communications is new exploration of wireless optical application. This will develop new applied fields of wireless optics. This paper is a part of "The principle and realization of high-capacity wireless optical CDMA communications" It is a project of National Natural Science Foundation of China (NSFC). I am mainly in charge of solving channel coding. This task ensures communicational reliability achieved. We investigate and research thoroughly channel of wireless optical CDMA. As far as indoors, outdoors and free space conditions are concerned, we establish respectively two-type channel models. Corresponding indoor and outdoor conditions, we establish Gaussian channel model; corresponding free space conditions, we establish Poisson channel model. Channel coding is always aimed at channel. Different channels should have different schemes for correcting errors. For this reason, we design two-type schemes. Corresponding Gaussian channel, we adopt interleaving convolution code; corresponding Poissonchannel, we make use of cascaded BCH code. Passing throughcomputer analogy and analyzing its analogue results, we haveproved two-type schemes feasible and each item satisfied. Theyare fitly applied in their channels respectively. By working hardwe have accomplished assignments which consist inestablishing chan-nel models, designing encoding schemes andmaking computer analogy. At last, we bring up novel idea andnew hope.