中文摘要：

基于IRA码迭代译码器结构，丈中研究了EXIT曲线图性能分析方法。利用此方法求出DVB—S2中各种码率IRA码的收敛门限值，并与高斯近似和密度进化方法求得的结果进行比较分析，探讨了EXIT曲线图的优点和应用技术。

英文摘要：

Based on the decoder structure of IRA Codes, the EXIT Charts are researched. By using this method the convergence thresholds for IRA Codes of DVB-S2are found, and also compared with the results obtained by Gaussian Approximation and Density Evolution Algorithm. Finally, the advantages and application techniques of the EXIT Chart are discussed.