Data Redundancy Scheme for High Availability Based on Improved Fountain Code

On the basis of the introduction of the fountain codes and the Luby Transform(LT) codes,the Raptor codes are explored.Then the improving Raptor codes based on RS codes through the analysis of the precoding method are put forward,which can overcome the deficiency that time and space overhead is not fixed in the LT code.The improving method has many advantages such as high decoding rate and provides appropriate solution to the problem of safe transmissions and high availability in the Internet transformation.Simulation indicates that the improving Raptor codes can improve correctly decoding probability.