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中文摘要：
针对非贝叶斯迭代载波同步联合译码算法的收敛条件进行研究，以EM迭代估计模型为例，重点研究了多种频偏预估计算法的估计性能，并结合最大似然相位估计算法，仿真得到了使EM迭代估计器收敛的概率，分析无法收敛对系统译码性能的恶化程度，以及为满足最终误码性能所需要选择的预估计方案，并得到了一些有参考价值的结论。
英文摘要：
The convergence requirements of non-Bayesian iterative carrier estimation algorithm are studied. The performance of some frequency offset estimation methods is reported, which combined with the ML phase offset synchronization method makes a pre-estimation for an EM algorithm based iterative estimation model, then the EM iterative algorithm convergence probability is given by simulations. Finally, this paper analyses the degradation of the LDPC decoding performance caused by non-convergence and gives some advices for the pre-estimation scheme. Some important results are given.
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