shuzhijifen

根据直扩原理，首先有随机数发生器产生一系列二进制信息数据（+1，-1），每个信息比特重复Lc次，Lc对应每个信息比特所包含的伪码片数，包含每一比特Lc次重复的序列与另一个随机数发生器产生的PN序列c(n)相乘。然后在该序列上叠加高斯白噪声和形式为i(n)=Acosw0n余弦干扰下次信号，切余弦干扰信号的振幅满足条件A<Lc。在解调器中进行与PN序列的互相关运算，并且将组成各信息比特的Lc个样本进行求和。加法器的输出送到判决器，将信号与门限值0进行比较，确定传送的数据为+1还是-1，计数器用来记录判决器的错判数目。(According to the principle, first some straight expansion random number generator produces a series of binary data (+ 1-1), each information bit repetitive Lc times, Lc for each information bit contains PN code piece count, embraces each bit Lc times repeated sequence and another random number generator produces PN sequence c (n) multiplication. Then in the sequence superimposed on gaussian white noise and forms as I (n) = Acosw0n cosine interference next time signal, cut cosine interfering signal amplitude satisfy conditions A < Lc. In the modem with the cross-correlation operation PN sequence, and the information will comprise the Lc a sample bits peace. The output of the adder judgment device, will signal to compare with threshold 0 data transmitted, determine for+ 1 or-1, counter is used to record the number victimised judgment. )

matlab仿真出光栅函数的菲涅尔衍射，其中有四副图，原图，二维衍射图样，函数图象和三维衍射图样(matlab simulation of the Fresnel diffraction grating function, including four plans, artwork, two-dimensional diffraction patterns, functions, images and three-dimensional diffraction pattern)

基于互信息量法求出的时间延迟结合cao法求取Rossler系统的嵌入维数。(Cao method slove embed_m questions.)

Forward Modeling 1 dimension Magnetotelurik

说明：  用MATLAB编写的人工鱼群算法的源代码。供大家学习(Prepared with artificial fish school algorithm MATLAB source code. For them to learn)

通过改进的阈值函数，实现小波阈值去噪，通过验证，效果较好(Improved threshold function, the wavelet threshold denoising pass validation, the better)

本程序实现chebyshev I型低通滤波(the program chebyshev I-low-pass filter)

人脸定位代码，短小但精度和速度都很高，matlab版本不能太低(Face location code, a short but very high accuracy and speed,)

存在多径时延的场景下，OFDM调制的移动TV的性能分析(none)

NSGA - II A multi-objective optimization algorithm