use of a GPS NMEA0183 service program source

用VHDL实现的FFT,经过测试，效果很不错！值得一看-Use vhdl to do fft，after test，we can see the result is very good!

介绍了一种构建在定点DSP上的高速瑞利衰落信道仿真模型。通过应用确知性瑞利过程的理论，使得仅需要较少的低频正弦波分量以及简单的运算即可实现较高精度的信道建模；进而可采用查表法并结合TMS320C6202定点数字信号处理器的高并行性和处理能力构造高速的仿真模型-Construction of a fixed-point DSP in the high-speed Rayleigh fading channel simulation model. Through the application process unascertained Rayleigh theory, only need to make small low-frequency sine wave components and the simple operation can achieve higher accuracy Channel modeling; then use look-up table method and combination TMS320C6202 fixed-point digital signal processor parallel and can handle Construction of the high-speed simulation model

采用VC和Mablat混合编程的手机发短信源代码程序，主程序为smssend_mainhg。需VC和Mablab3.0编译环境。-The use of VC and mixed programming Mablat phone text messaging program source code, the main program for smssend_mainhg. VC and Mablab3.0 need to compile the environment.

通用高质量的串口类库；适用于任何windows平台的C++编译器-Universal Serial high-quality library; Applicable to any windows platform C compiler

扩频发射机，信道编码采用(2, 1, 7)卷积 码, 扩频模块采用扩频长度255 的kasami码, 极性变换模块为3bit 量化模式, 内插模块为每两比特间插入7bit 和输出滤波为16 阶的FIR 滤波器。-direct sequence spread spectrum transmitter

关于3G基站的培训，现在正在搞TD，应该对大家有用处。-3G base stations on the training, are now engaged in TD, everyone should have usefulness.

数字信号调制动态演示系统，包含AM,PM,FM等多种演示，运行界面操作简单。-welcome to downloads this code !thank you!

MAX274有源滤波器的设计应用。　介绍MAXIM公司系列芯片MAX274的工作性能与特点,并详细介绍了MAX274滤波器的公式和软件设计方法-MAX274 Application of active filter design. Introduction MAXIM company MAX274 chip performance and characteristics, and detailed the MAX274 filter formula and software design methods

一份详细的SIP协议的数据流分析的文档，该文档有两百多页，包含的SIP消息的各种情况，内容实用，可供SIP协议的VoIP开发者做一份详细的SIP数据流的分析手册。-a detailed SIP protocol data flow analysis of the document, the document is over 200 pages and contains information of the various SIP, as practical, the SIP for VoIP developers to do a detailed SIP data flow analysis handbook.

利用自回归模型产生Rayleigh率落信道-use of regression models have Rayleigh rate charged Channel