最大似然（ML）准则和最大后验概率（MAP）准则，是学习PCA特征提取的很好的学习资料，给出接收信号眼图及系统仿真误码率。- Maximum Likelihood (ML) criteria and maximum a posteriori (MAP) criterion, Is a good learning materials to learn PCA feature extraction, The received signal is given eye and BER simulation systems.