lvbofangzhen

将一张图片由直角坐标转换为极坐标，并且分别显示图片(the trans of coordination)

一维无网格模型,通过这个文件，大家可以学习到无网格法的基本运算方法，是想要学习无网格法的入门之选(it is a file about messless)

surface acoustic wave for filter correlation

Phase-shift keying (PSK) is a method of digital communication in which the phase of a transmitted signal is varied to convey information. There are several methods that can be used to accomplish PSK.

将输入d进行扩张，方法是在d的每个数据中插入M-1个零值。 如输入d=[1,2,3,4] M=3 输出out=[1 0 0 2 0 0 3 0 0 4 0 0](To expand the input d, the method is to insert each data d, M-1 zero value. If the input d = [1,2,3,4] M = 3 output out = [1 0 0 2 0 0 3 0 0 4 0 0])

DIGITAL water marking

实现图像的傅里叶高通、低通滤波.经Fourier变换后的图像，中间部分是低频部分，外边是图像的高频部分。经过低通滤波后，图像中的高频成分被滤除掉，只留下低频成分，图像的边缘部分变得比较模糊了(useful for image Fourier high-pass, low pass filter)

VMD变分模态分解，vmd函数是通用的，vmd_test是1s专用的，所以只要改test文件，要设一个时间(VMD variable modal decomposition, vmd function is universal, vmd_test is dedicated to 1s, so just change the test file, set a time)

OFDMA reception. following this code you can learn clearly how to the OFDMA receiver process the received signal.(OFDMA reception. Following this code you can learn clearly how to the OFDMA receiver process the received signal.)

matlab tracking source code to track a moving object on the scene by using centroid and rectangle method