some C++ builder documents collected by myself, which are mainly on serial port

用OPNET来仿真无线网络,可以基本实现无线的功能-Use OPNET to simulate wireless networks, can basically achieve wireless functionality

QAM调制的基本原理 QAM调制实际上是幅度调制和相位调制的组合。相位 + 幅度状态定义了一个数字或数 字的组合。QAM的优点是具有更大的符号率，从而可获得更高的系统效率。通常由符号率 确定占用带宽。因此每个符号的比特（基本信息单位）越多，效率就越高。-QAM modulation of the basic principles are in fact QAM modulation amplitude modulation and phase modulation of the portfolio. Phase+ margin status defines a combination of numbers or figures. The advantage of QAM symbols are greater rate, thus the system efficiency will be higher. Symbol rate is usually determined by the occupied bandwidth. Thus each bit symbols (basic units of information) the more the higher the efficiency.

这是一篇关于p2p协议和sip协议互通的文章,他们共同作用来实现分布式的功能:语音,视频,文件等功能-This an agreement on p2p sip agreement and the exchange of articles, they work together to achieve distributed functions : voice, video, documents, etc. Function

用MATLAB产生GOLD序列，大家可以学习一下~-GOLD sequence generated using MATLAB, we can learn from you ~

为基带系统测试误码率而写的数字噪声程序，包括噪声产生程序和一个测试文件。可以分别产生两路噪声供I，Q两路使用，速率80Mbps左右。-System testing for the baseband BER digital noise written procedures, including noise generation process and a test file. Can generate two-way noise for I, Q two-way use, the rate of about 80Mbps.

Nokia论坛提供的基于CDMA的SmartMessage协议，可以在此基础上实现铃声RingTone图片Logo,VCard,VCalendar-Forum Nokia"s CDMA-based SmartMessage agreement can be achieved on this basis ringtones RingTone Photo Logo, VCard, VCalendar

一份MMS彩信资料，可以开发出简单的彩信，用JAVA实现-a MMS MMS information, we can develop a simple MMS, using JAVA

专用于3G手机应用的开发语言android代码，描述在手机中进行数据存储的不同方法！-Exclusively for 3G mobile application development language android code that describes the data stored in mobile phones in different ways!

网络授时服务是在网络上设置一些时间服务器，用户通过Internet访问这些时间服务器就可同步本地计算机时钟的服务。-network time service on the network is set up some time server, Internet users visit those time servers can be synchronized to the local computer clock service.

WDM光网络中路由过程可视化本文主要针对WDM光网络中路由过程可视化问题，将光网络路由过程分为路由过程和波长分配过程。-WDM network routing process visualization This paper mainly deals with WDM network routing process visualization, optical network routing process is divided into the process of routing and wavelength distribution process.