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Optimizing Degree Distributions of LT Anti-eavesdropping Based on Fountain Code

Optimizing Degree Distributions of LT Anti-eavesdropping Bas...

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作者： DIONNE JUDITH ATOME ESTELLE 辽宁工业大学

学位级别：硕士

In today's rapidly developing information age,wireless communication has developed from the exchange of information between people to the ability to establish connections between everything,becoming the protagonist of the ***,its broadcast transmission method makes the information easy to be stolen by illegal eavesdroppers during the transmission process,which damages the basic rights of legal *** to the characteristics of low decoding overhead,low encoding and decoding complexity,and strong adaptability,LT codes have better anti-eavesdropping advantages in wiretapping channels,and the encoding method is one of the main factors affecting the performance of LT ***,in order to ensure the security of wireless transmission,from the perspective of physical layer channel coding,this paper takes LT code as the research object,studies its coding method,and proposes an improved method of LT code coding by reorganizing the RSD coding matrix with the best degree 1 to improve Anti-eavesdropping performance of LT codes in eavesdropping *** LT code adopts the BP decoding method,which starts to decode when it receives a code symbol of degree 1,while the traditional LT code generates a coding matrix based on the RSD degree distribution *** size distribution of the degree is random,if the encoding symbols of degree 1 are sent to the receiving end and the eavesdropper earlier,there is a possibility that the eavesdropper recovers the source encoding symbols before the legitimate receiver,so that the eavesdropper successfully steals *** this paper,aiming at the randomness of the moderate distribution of the coding matrix of the traditional LT code,an improved LT code coding method of coding matrix reorganization is proposed,and a new coding matrix is obtained by rearranging the columns in the coding matrix of the traditional LT code according to the degree value from large to small,aiming to move the coded symbols of degree

关键词： LT codes anti-eavesdropping encoding matrix recombination similar number loop decoding cost

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