这是篇<基于FPGA 的OFDM 宽带数据通信同步系统设计与实现>, 觉得甚是有用，大家共同学学。(This is the article <FPGA-OFDM-based broadband data communication systems design and implementation of synchronous> that even be useful, we all learn together.)

代码实现了一个根升余弦成型滤波器，2PAM信号通过此成型滤波器，并且匹配接收，画出了发送和接收波形，验证了代码的正确性。(The code designs a root raised cosine filter,2PAM signal transmitted through the filter and matched using the same filter, I plot the transmitted signal and received signal to verify the correctness of the code.)

vga，显示彩条，及其简单易懂，适合初学(vga, display color bars, and its easy-to-understand, suitable for beginners)

应用背景Booth乘法器实现快速乘法algorithm.mainly用于通信和DSP组成的3块摊位重新编码，华勒斯树和超前进位addder关键技术超大规模集成电路设计，通信和DSP的应用，芯片设计，VHDL，Verilog程序，加法器和乘法器

DDS中的正余弦生成，初始相位相差90度，可自行改变输出频率(Cosine generation of DDS, the initial phase difference of 90 degrees, the output frequency can be changed on their own)

基于VHDL的RS232通讯程序,包含完整的源代码,锁脚文件以及下载文件,可直接下载使用(VHDL based on the RS232 communication procedures, including complete source code, locking pin, as well as download files documents can be directly downloaded using)

基于QuartusII环境下以模块化的形式做成的视频复合同步信号。-QuartusII-based environment to create the form of modular composite video sync signal.

本程序设计一个基于FPGA的4相步进电机定位控制系统。由步进电机方向设定电路模块、步进电机步进移动与定位控制模块和编码输出模块构成。前两个模块完成电机旋转方向设定，激磁方式设定和定位角度的换算等工作，后一个模块用于对换算后的角度量编码输出。-This procedure to design an FPGA-based 4-phase stepper motor positioning control system. Direction set by the stepper motor circuit module, stepper motor stepper movement and positioning control module and the code output modules. The first two modules complete the motor rotation direction setting, exciting way of setting the angle and positioning of the conversion work, after a module for the point of view of the volume of converted output encoding.

本文设计了基于加速度传感器的计步器，并通过仿真以及实际调试得到了相应的结果的记录。本实验首先通过加速度传感器检测目标物体的运动，产生脉冲，将脉冲放大后经过施密特触发器整型为方波，并给出了方波的调试电路图。然后编写程序，利用D触发器检测方波的上升沿，当上升沿到来时，计数，并对十位、个位分别编码，然后由使能信号交替控制数码管输出结果。本文给出了仿真以及调试的程序、结果。(This article is designed pedometer-based acceleration sensor and the corresponding results recorded by simulation and debugging. The experiments by first acceleration sensor detects the movement of the target object, generates a pulse, the pulse amplification is a square wave after the Schmitt trigger integer, and gives the the debug circuit diagram of a square wave. Then write procedures, the use of the rising edge of the detection of the square wave of the D flip-flop, when the rising edge, the count, and ten bits are encoded, and then alternately by the enable signal output of the digital control. In this paper, a simulation and debugging procedures, results.)