验证码特征生成的说明性文件，具有较好的代表性。-Code generated descr iptive characteristics of documents, with better representation.

CRC即循环冗余校验码（Cyclic Redundancy Check[1] ）：是数据通信领域中最常用的一种查错校验码，其特征是信息字段和校验字段的长度可以任意选定。循环冗余检查（CRC）是一种数据传输检错功能，对数据进行多项式计算，并将得到的结果附在帧的后面，接收设备也执行类似的算法，以保证数据传输的正确性和完整性。-CRC is the most commonly used in the field of data communication error check code, which

有信道编码，调制，信道估计等，是学习PCA特征提取的很好的学习资料，包括最后计算压缩图像的峰值信噪比和压缩效果的源码。- Channel coding, modulation, channel estimation, Is a good learning materials to learn PCA feature extraction, Including the final calculation of the compressed image peak signal to noise ra

包括最后计算压缩图像的峰值信噪比和压缩效果的源码,MIMO OFDM matlab仿真,小波包分析提取振动信号中的特征频率。- Including the final calculation of the compressed image peak signal to noise ratio and compression of the source, MIMO OFDM matlab simulation, Wavelet packet analysis to extract vibratio