chap4_09_GPC_NoIden

说明：  仿射变换和猫脸变换是图像加密算法中最基本的算法之一，很多重要的加密算法都是在此基础发展而成的，该程序供研究加密算法的初学者参考使用。(Affine transformation and cats face is the most basic image encryption algorithm in one of many important cryptographic algorithms are evolved on this basis, the program for research reference for beginners to use encryption algorithms.)

基于遗传算法的自动组卷算法，能实现按照知识点、难度、区分度的自动试题提取组卷。(Automatic test paper based on genetic algorithm, can achieve according to knowledge, the difficulty of distinguishing the degree of automatic extraction of test paper questions.)

说明：  alamouti 空频分组码---在时变信道下SFBC-OFDM(alamouti space-frequency block codes- in the time-varying channels under the SFBC-OFDM)

说明：  对图像进行TA置乱，请根据图像大小自行设定周期。(TA scrambling the image, the image size according to set their own cycle.)

利用一数学仿真工具构建一16-QAM的通信系统 工具：推荐使用Matlab,可使用信号处理工具箱但不能利用通信工具箱(The use of a mathematical simulation tools to build a 16-QAM communication system tools: Recommended use of Matlab, Signal Processing Toolbox can be used but not the use of communication toolbox)

详细讲述了直接序列扩频差分锁相环的文章，包含具体的算法结构，并附有仿真结果。(A novel differentially coherent delay-locked loop(DCDLL) for accurate code tracking is proposed for direct sequence spread spectrum systems. Due to the use of the differential decoder and exactly one correlator, the proposed scheme avoids the problems of gain imbalance. The tracking error variance is derived by linear analysis. When the proposed DCDLL scheme is applied in ranging with additive white Gaussian noise (AWGN) channel, the performance of the proposed DCDLL scheme is about 1.4 dB better than that of one-correlator tau–dither loop (TDL), and near that of noncoherent DLL.)

用前后向空间平滑法实现相干信源DOA估计(using the method of forward and backward spacial smoothing to realize coherent signal DOA)

The carpetplot class is a tool to create four variable carpet plots and three variable cheater plots

杆件有限元程序，非常适合初学者学习matlab，也可以深刻了解有限元的计算过程(Rod finite element program, it is suitable for beginners to learn matlab, but also a profound understanding of the finite element calculation process)

将两个矩阵的卷积运算转换为构造的新矩阵的相乘运算(The two matrix of convolution operation into the matrix multiplication)