多径信道下可有效提高频偏估计性能

用于matlab VSLMS 代码， 可适应滤波器的回声消除功能(For matlab VSLMS code, and can be adapted to filter echo cancellation)

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. )

dsp builder 的使用简介，与Matlab嵌套安装相关内容(dsp builder)

产生白噪声，并对白噪声进行fft，画出白噪声的频谱。(White noise and white noise fft, draw a white noise spectrum.)

Secon project for student learning it is very interesting for learning

说明：  有限差分法求解一维扩散方程。使用Crank-Nicolson格式求解PDE方程，并与真实解析解u(t,x)=e^(x+0.1t)比较。 一维扩散方程的有限差分法，采用隐式六点差分格式。(Finite difference method for solving one dimensional diffusion equation)

数据拟合 (Numerical routine fit)

srtm是美国nasa指定的精度为90米的全球高层数据，函数srtmshow可以利用matlab读取这样的数据，并且以mesh的形式显示他们。用法：srtmshow（‘c:/.../XXX.ttf’,60,70,60,70）。表示读取文件XXX.ttf中横向60 -70 ，纵向60 -70 的数据并显示他们。 (srtm the United States designated the accuracy of nasa' s global top 90 m data, the function srtmshow can use matlab to read this data and to display them in the form of mesh. Usage: srtmshow (' c :/.../ XXX.ttf' , 60,70,60,70). That read the file XXX.ttf 60 -70 in the horizontal, vertical 60 -70 of the data and display them.)

This is an intuitive sudoku solver in matlab.

信号发生器 可以产生三角波郑玄波！等等 是基于GUI设计的 打家可以参考一下(how are you!)