RS编解码的FPGA实现

时间同步后即可确定每帧数据的起始位置，这样就能完整的截取下每一帧。但是，数据中还带有频偏信息。在常规的通信系统中，多普勒很小仅仅会带来很小的频偏，但是在大多普勒的情况下，频偏将非常大，20马赫的速度将会带来将近34K的频偏。因此，如何很好的纠正频偏即为本系统的难点。 OFDM中，我们将大于子载波间隔倍数的频偏称为整数倍频偏，而将小于一个子载波间隔的频偏称为小数倍频偏。频偏矫正精度只要能保证小于十分之一倍的子载波间隔，频偏就不会对均衡和解调造成影响。本文中我们借鉴这种思想，由于硬件资源限制，我们将在接收端做64点FFT，即相当于将频域划分为64份，我们将小于 的频偏称为小数倍频偏，将 整数倍的频偏称为整数倍频偏。本程序即基于SCHIMDL经典方法完成小数倍频偏纠正(After time synchronization can determine the starting position of each frame data, so you can complete the interception of each frame. However, in the data with frequency information. In conventional communication systems, doppler small will bring only small deviation, but in the case of most of the doppler, frequency PianJiang is very large, 20 Mach speed will lead to deviation of nearly 34 k. Therefore, how to good to correct deviation is the difficulty of this system. OFDM, we will be bigger than the sub-carrier spacing ratio of frequency deviation is called the integer frequency offset, and the interval will be less than a child carrier frequency offset is called decimal frequency doubling. Deviation is less than one over ten times as long as can guarantee accuracy of sub-carrier spacing, deviation will not affect balance and demodulation. This article, we draw lessons from the idea, due to the limited hardware resources, we will do 64 points FFT at the receiving end, which is equ)

Multipleksor 3 to 1 - 3x1bit in, 1x1bit out

数字钟通过verilog实现，并且支持Modelsim仿真，通过实验验证(The digital clock is implemented by Verilog and supports Modelsim simulation)

基于FPGA的UDP网络图像传输实验，FPGA完成了MT9V034的RAW图像采集缓存，NIOS完成了图像的UDP封包，DM9000芯片完成了MAC和PHY的功能。(Based on the UDP FPGA network image transmission experiment, FPGA completed the RAW MT9V034 image acquisition cache, NIOS completed the image of the UDP packets, DM9000 chip MAC and PHY completed the function.)

DSP28335与FPGA通过spi通信，此程序为28335为主接收程序(DSP28335 and FPGA through the SPI communication, this procedure for the 28335 receiving procedures)

温度传感器实验，将温控芯片的温度信号通过fpga用数码管显示(temperature display)

该例程是PC机通过FX2-CY7C68013-A的USB2.0控制芯片与FPGA实现通信。其中的工程和代码包括PC机上的USB固件程序、驱动程序、上位机程序，FPGA上的VERILOG通信程序。(The routine is a PC, through the FX2-CY7C68013-A of the USB2.0 controller chip and the FPGA to achieve communication. One of the projects and code, including PC, the USB firmware, drivers, FPGA' s Communication Program)

基于FPGA设计的电子密码锁是一个小型的数字系统，与普通机械锁相比，具有许多独特的优点：保密性好，防盗性强，可以不用钥匙，记住密码即可开锁等。(FPGA-based design of the electronic code lock is a small digital system. It has many unique advantages：good privacy and security , it do not need the key but remember password to unlock, and so on while it compare to ordinary mechanical locks.)

sin波形发生图形，应用智能老师款到即发了快速打击 (sin waveform generation graphics application smart teacher paragraph to that made a rapid strike)

QPSK调制的载波频偏估计，是一个可以调用的函数。接收端进行了一系列的处理。经典的Kay法(QPSK-carrier frequence offset estimation_ kay )