yidongtongxin

modbus 协议文本，介绍MODBUS协议的所有内容，(Modbus text of the agreement to introduce all the elements of MODBUS protocol,)

基于单音干扰的BPSK通信系统的误码率分析(BPSK communication system based on single-tone interference error rate analysis)

Performance Evaluation of DWT

汽车诊断协议 基于UDS的网络层源代码(Network Layer Source Code Based on UDS for Automobile Diagnosis Protocol)

说明：  自己用的小软件，仿造原子的XCOM功能，加了一下自己用的功能。 1、基本串口通讯，鼠标放入串口选择自动刷新，显示COM口的驱动类型。 2、多条发送界面，可定时发送，可关联数字键盘、右键发送按钮可更改按钮名称，方便记忆。 3、485通讯，数据有十进制和十六进制可选，发送后自动保留记录。 4、CRC校验小工具。 5、十六进制通信协议提取部分位并根据自定义数据类型转化为十进制 6、字符格式示波器，例：">P:-1.25"，示波器显示曲线名称P，数值-1.25，曲线个数最多8个。 7、类似MODBUS协议截取第2-5位，合成一个int数值，然后示波器显示波形，最多5个曲线 8、示波器曲线可键拖拽、放大(QT serial port assistant, plus digital oscilloscope)

此文件为一仿真机的压缩文件，主要是针对解决光通信系统里面传输过程中的非线性补偿而写的代码，可以有效的补偿光在光纤里面传输的非线性。(This file is a compressed file of an emulator, which is mainly written to solve the nonlinear compensation in the transmission process of the optical communication system, and can effectively compensate the nonlinearity of light transmission in the optical fiber.)

说明：  本人用石川法求齿轮的啮合刚度，完整版的程序，里面可以运行啮合刚度图(Meshing Stiffness of Gears Calculated by Ishikawa Method)

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MIMO系统里 2发2收天线，采用Alamouti发案编码的无线传输系统在瑞瑞丽平衰落信道下的误码率性能仿真，系统采用调制方式为QPSK。(MIMO 2 send and 2 receive antenna ,)

说明：  默认产生（0，1）的高斯随机数，参数可调(Gauss random number (0,1) is generated by default with adjustable parameters.)