Fountain Codes Degree Distribution Design Based on Short Code Length
AO Jun
LU Yajun
MA Chunbo
Abstract：Degree distribution is of vital importance to the construction of fountain codes .It determines the perform‐ances of coding and decoding directly .In this paper ,the performances of rubust solition distribution ,chopped degree distri‐bution ,and fixed degree distribution are analyzed and simulated .The result shows that the cost of decoding decreases as the length of codes increases giving the same number of code words .The cost of decoding is minimized by rubust solition distri‐bution when the input code length is large ,and when the input code length is small ,it is chopped degree distribution's turn to play that role .Considering the effectiveness and reliability in practical applications ,an optimized degree distribution which applies to short codes is designed .The simulation shows that the probability of correct decoding of the optimized degree dis‐tribution increases by one order magnitude comparing to chopped degree distribution when decoding of those distributions cost the same .
Keywords：fountain codesratelessLT codedegree distribution
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 2101-2105 )