是学习PCA特征提取的很好的学习资料，采用加权网络中节点强度和权重都是幂率分布的模型，考虑雨衰 阴影 和多径影响。- Is a good learning materials to learn PCA feature extraction, Using weighted model nodes in the network strength and weight are power law distribution, Consider shadow rain attenuation and multipath effect.