Meanwhile , we also study the convergence behavior of iterative detection in different methods , which are the proposed average source entropy and the covariance matrix perturbation characterized by the variations of its dominant eigenvalue as well as the conventional approach based on the mutual information 為了分析迭代譯碼的收斂特性,本文從不同角度出發(fā),在研究了傳統(tǒng)的互信息方法的基礎(chǔ)上,本文首次提出并使用了平均信源熵和用協(xié)方差矩陣最大特征值表征其抖動這兩種方法,使迭代過程的收斂分析變得簡單方便。