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为减少短喷泉码硬译码的延时和抖动,进行了理论分析和仿真优化.首先,推导了任意删除概率下硬译码延时和抖动的表达式,并分析了度数分布对这两者的影响;其次,针对几种典型短喷泉码,通过仿真优化降低了延时和抖动,其中,码长为1 024包的2种Raptor码的最小延时和抖动分别可优化至9.56%和3.22%,比现有短喷泉码有较大提升,具有较强的实用性.
In order to reduce the delay and jitter of the short fountain coding, the theoretical analysis and simulation optimization are carried out.Firstly, the expression of delay and jitter of hard decoding under arbitrary deletion probability is deduced, Secondly, for several typical short fountain codes, the delay and jitter are reduced through the simulation optimization. The minimum delay and jitter of the two kinds of Raptor codes with code length of 1 024 packets can be optimized to 9.56% and 3.22 respectively %, Than the existing short fountain code has greatly improved, with strong practicality.