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算术码是一种高效的熵编码,但是对误码十分敏感,由此引入了纠错算术码。以往研究中发现基于比特填充法的纠错算术码,其检错时延分布近似几何分布。文中通过研究基于比特跟随法的纠错算术码的检错时延分布,建立了符号检错时延分布的伽马分布模型,并通过曲线拟合得到了伽马分布的参数与影响因素之间的数学关系。拟合计算得出的数据与实验数据比较证实了新模型的可靠性。
Arithmetic codes are efficient entropy codes, but are very sensitive to error codes, thus introducing error correction arithmetic codes. In previous studies, we found that the error correction arithmetic code based on the bit-stuffing method has an approximate geometric distribution of the error detection delay distribution. By investigating the error detection delay distribution based on the bit-following method, a gamma distribution model of the symbol error detection delay distribution is established and the mathematical relationship between the parameters of the gamma distribution and the influencing factors is obtained through curve fitting relationship. Comparing the calculated data with the experimental data confirms the reliability of the new model.