UsingProtocol

QPSK开环载波同步技术研究 频偏估计算法(Open-loop carrier synchronization QPSK Research Frequency Offset Estimation Algorithm)

D2D通信matlab仿真，基于matlab的D2D设备到设备通信系统模型仿真(Simulation of D2D Communication with MATLAB)

生成2KHz和8KHz的混合信号,使该信号通过上述滤波器,观察滤波前后的波形变化和频谱分布情况,(The mixed signal of 2KHz and 8KHz is generated, and the waveform changes and spectrum distribution before and after filtering are observed through the filter.)

J2ME开发精解原码 第5章内容 大家多多交流 共同提高(J2ME development of sperm solution Chapter 5 of the original code the content of many U.S. exchanges enhance common)

利用MATLAB来进行大气信道中的激光通信仿真，英文原版(Optical Wireless Communication Systems-system and chanel modelling with matlab)

最简单的串口收发程序，全部用VC++实现，对初学VC串口通信的朋友有很大帮助，提供全部源代码，提供串口类的.CPP和.H文件。(The simplest procedure serial transceivers, all with VC++ implementation of serial communication beginner VC friend of great help, providing all the source code, to provide serial port class. CPP and. H files.)

说明：  5. 在三条径的瑞利信道中，对于直接序列扩频： (1) 请设计DS-CDMA一种具体的码分导引辅助的信道估计方法，接收机分别采用等均益合并、最大比合并。用Simulink进行仿真，画出比特信噪比与信道估计均方误差的关系曲线和比特信噪比与误码率的关系曲线。 (2) 设频率已经同步，请设计DS-CDMA一种具体的单停顿滑动相关时间同步方法，用Simulink进行仿真，画出比特信噪比与捕获概率的关系曲线。 (3) 设时间已经同步，请设计DS-CDMA一种具体的频率同步方法，用Simulink进行仿真，画出比特信噪比与频率同步误差的关系曲线。(5. In three-path Rayleigh channel, for direct sequence spread spectrum: (1) please design a specific code division navigation aided channel estimation method for ds-cdma, and adopt equal-beneficial combination and maximum ratio combination for receivers respectively.Simulink is used to simulate and draw the relationship curve between bit SNR and channel estimation mean square error and the relationship curve between bit SNR and bit error rate. (2) assuming that the frequency has been synchronized, please design a specific single-stop sliding correlation time synchronization method ds-cdma, Simulink simulation, draw the relationship between the bit SNR and the acquisition probability curve. (3) if the time has been synchronized, please design a specific frequency synchronization method ds-cdma, Simulink simulation, draw the relationship between the bit SNR and frequency synchronization error curve.)

说明：  在信号发送后，接收方需要实现位同步才能正确解码(after signal is sent, receiver need bit syn to decode correctly)

上位机与三菱PLC之间进行TCP/IP通讯(communication between PC and PLC)

电脑串口控制西门子s7-200程序，可以通过电脑直接控制PLC(Computer serial port control of Siemens S7-200 program)