It will spreading a singal with PN code, then despreading it to recovery the signal.

This article will guide you how to compile latex document with sublime, and review pdf file result.

Many user may would like to include high quality Matlab graphics in their Latex articles or books. Here I will share some tips how to do it. From easy to difficult, I will introduce three methods:

1. Export an .eps file from Maltab, and include it in Latex article.
2. Export an .eps file from Maltab, edit this file with Adobe Illustrator, then use it in Latex.
3. Produce a TikZ code from the Matlab figure, and then include the TikZ code in Latex.

Now I will detail introduce each method, at last will talk about each method advantage and disadvantage.

## 摘要

1. 用数字方式（离散时间）描述信号$x(t)$
2. 利用傅里叶变换将离散信号$x[n]$变换到频域$X[k]$
3. 提取频域信号$X[k]$的幅值和相位谱，及功率谱
4. 由频域信号恢复出时域信号