变长码的抗误码扩散能力分析  

Analysis of the error resiliency of variable length codes

作　　者：黄全亮[1] 刘卫忠[1] 邹雪城[1] 孙德宝[2] 

机构地区：[1]华中科技大学电子科学与技术系,湖北武汉430074 [2]华中科技大学控制科学与工程系,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2007年第2期71-73,共3页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：信息产业部电子发展基金资助项目

摘　　要：给出了一种基于离散无记忆信源模型的分析变长码抗误码扩散能力.该方法通过分析序列中某一时刻某个码字出现的概率,以及该码字发生错误后正好变成与该码字同码长的另一码字的概率,得到该时刻不发生误码扩散的概率.而整个序列不发生误码的概率为该概率的序列长次幂.模拟计算结果显示,该方法可在不增加平均码长和码方差的情况下,选择出抗误码扩散能力最好的码组.The analysis of error resiliency of variable length codes （VLC） by Discrete Memoryless Source model is proposed. The probability of error resiliency was counted at the time when the appearing probability of one codeword in the code sequence at a fixed time and the transition probability from this codeword to other codeword with same codeword length to this codeword were analyzed. The error resiliency probability of whole code sequence is the code sequence length power of this transition probability. The simulation results show that the VLC with best error resiliency could be picked out in the VLCs which possesses the same average code length and codeword variance by the method.

关 键 词：变长码 抗误码扩散 离散无记忆信源 平均码长 码方差 

分 类 号：TN919.8[电子电信—通信与信息系统]