test_main

QAM调制的误码率仿真代码，通俗易懂，简单实用。(The error rate simulation code of QAM modulation is easy to understand, simple and practical.)

西门子STEP7，费斯托阀岛的GSD文件，硬件组态使用(SIEMENS STEP7, GSD File of Fisto Valve Island, Hardware Configuration Use)

这是矩阵计算一书的第二部分，由于是从网上下载的，两部分是分开的，没法合并，所以只好分两次上传，欢迎下载浏览。(This is the matrix of the second part of the book, as it is downloaded from the Internet, the two parts are separated, can not be combined, so only two upload, please download the browser.)

光纤通信基础知识，介绍了单模，多模光纤的特点(Optical fiber communication based on knowledge, introduction of the single-mode, multimode fiber characteristics)

短信群发系统，在一些业务范围广泛的公司中，当公司有了新的通知要告诉在外地的员工，通常使用拨打电话的方式，这样虽然能把事情说清楚，但是当在外的员工比较多时，工作量很大，为了解决这个问题，可以开发一个企业短信群发管理系统。企业短信群发管理系统主要利用硬件短信猫发送短信，并且可以查看SIM卡中收到的短信。(Mass messaging system, in a number of business a wide range of companies, when the company has a new notification to tell the staff in the field, normally used by calling the way, so although things can make it clear, but when the staff out for a long time compared , the heavy workload, in order to resolve this problem, can develop an enterprise management system for mass text messaging. Short Message management system for enterprises mainly use the hardware to send SMS text messages a cat and can view the SIM card text messages received.)

适应多个模式的rs编码，Verilog，选择对应的多项式(RS coding adapted to multiple modes.)

用C++写的LDPC的传输仿真程序,包括编码,BP译码以及判决()

小区搜索程序，能够在OFDM框架下对信号的调制解调定位等问题进行仿真。(Cell search procedure, to the framework of the OFDM modulation and demodulation of the signal localization issues such as simulation.)

对语音信号进行加噪，求它的功率谱，降噪处理(Adding noise to speech signal and reducing noise)

说明：  PCM编码译码的matlab代码，设一个输入量，对其进行通信原理仿真。(The MAT code of the PCM code decoding, set an input quantity, and simulate the communication principle.)