OFDM 调制与解调

这个程序是 用于两个浮点数字加法器使用 VHDL 语言。

本源码为Nios II的开发示例,主要演示Nios II的I2C总线设计。开发环境QuartusII。 本示例十分经典，对基于SOPC开发的FPGA初学者有很大帮助。-The source code for the Nios II development of an example, the main demonstration Nios II I2C-bus design. Development environment QuartusII. This example is very classic, FPGA-based SOPC development of great help for beginners.

脉动乘法器：一个GF(2m)域上的Digit-Serial 脉动结构（Systolic）的乘法器(Pulse Multiplier: a GF (2m) domain on the Digit-Serial pulsation structure (Systolic) the multiplier)

十字路口交通灯的单片机控制源代码 红黄绿三灯 还有数码管时间显示(Intersection traffic lights SCM source code red yellow three lights and LED time display)

1024点fft verilog hdl-1024-point fft verilog hdl

AD7606采集代码，用于verilog 驱动 AD7606 adc SPI 串口方式(AD7606 acquisition code, used for Verilog drive AD7606 ADC SPI serial mode)

产生高斯最小相移键控信号的阐述仿真，包括调制解调、信道模型等。(Simulation program to realize GMSK transmission system)

基于FPGA器件的DDS设计实现中的一个核心部分就是波形存储表的设计。首先采用LPM_ROM和 VHDL选择语句这两种方法进行波形存储表的设计和比较分析 然后考虑到硬件资源的有限性及DDS的精度要 求,对这两种方法的程序进行了优化 最后对这两种方法设计的程序进行仿真和硬件调试。结果表明:采用这两种 方法都能有效地实现DDS中波形存储表的设计。 (DDS-based FPGA devices designed to achieve one of the core of the waveform is stored in table design. First of all, choose to adopt LPM_ROM and VHDL statements of these two methods for the design waveform storage tables and comparative analysis and then, taking into account the limited hardware resources and the accuracy of DDS, the two methods to optimize the process the last of these two methods of process design simulation and hardware debugging. The results showed that: the use of these two methods are all effective ways to achieve the DDS waveform stored in the table design.)

采用STC89C52单片机的定时器以实现两路PWM波输出，占空比、频率可调(Microcontroller timer used to achieve STC89C52 two PWM wave output, duty cycle, frequency adjustable)

QPSK调制下的（5,7）卷积码的编码和维特比译码与BPSK调制下（5,7）卷积码的编码和维特比译码的BER特性(QPSK modulation under (5,7) convolutional code encoding and Viterbi decoding and BPSK modulation (5,7) convolutional code encoding and Viterbi BER characteristic)