dianji

这是射线信道模型的代码。里面有多个m文件(This is the code for the ray channel model. There are multiple M files in it.)

AWGN信道、瑞利衰落信道、多径信道条件下的OFDM信号与单载波信号的识别(AWGN channel, Rayleigh fading channels, multipath channel conditions, single-carrier OFDM signal with the signal recognition)

DVB-S2 LDPC代码，不含有级联的BCH码(In our following paper, we find that the shortten codes of DVB-S2 have some problems,this program can provide a good DVB-S2 LDPC code without cascaded BCH codes)

说明：  产生随机信号，采用4fsk调制方式通过一个水声信道，再采用非相干解调(Generate random signal, use 4FSK modulation to pass through an underwater acoustic channel, and then use incoherent demodulation)

搭建永磁同步电机的直接转矩控制仿真模型 1，实测电流经过3/2变换得到alpha-beta轴上的电流； 2，估计模块中包含定子磁链和电磁转矩的估算，其中，定子磁链观测是采用基于转子位置和定子电流的磁链估计，电磁转矩直接在alpha-beta轴上计算； 3，转速调节模块和转矩调节模块直接采用PI调节器； 4，预期电压矢量估计模块，根据k时刻的磁链幅值与相位和k+1时刻的磁链幅值和相位计算出来的； 5，SVMPWM是空间电压矢量调制模块，实现空间任意角度任意大小的电压矢量，从而控制磁链轨迹近似为圆型； 6，逆变器模块和电机模块均采用系统自带的；(Build a permanent magnet synchronous motor direct torque control simulation model, the measured current after 3/2 transform the current alpha-beta axis estimated module included in the estimation of the stator flux and the electromagnetic torque, stator flux chain observation is based on the position of the rotor and the stator current flux estimates, the electromagnetic torque directly in the alpha-beta axis 3 speed controller module and torque adjustment module directly using the PI regulator expected voltage vector estimation module , calculated according to the time k flux amplitude the phase and k+1 time flux amplitude and phase 5, SVMPWM the space voltage vector modulation module voltage vector space at any angle of any size, thereby controlling the flux path approximate round inverter module and motor module system comes )

说明：  基于matlab语言编写，可手动掩模感兴趣区域，利用多项式拟合整景影像趋势误差并去除。(Based on MATLAB language, the region of interest can be masked manually, and the trend error of the whole image can be removed by polynomial fitting.)

说明：  使用Lenet网络对手写数字进行识别，识别效果比较好(Recognition of handwritten numerals by using Lenet network has better recognition effect.)

QPSK定时同步代码，采用Gardner定时同步算法，Farrow插值算法(QPSK timing synchronization code, using Gardner timing synchronization algorithm, Farrow interpolation algorithm)

DSP串口驱动程序，初学者可以作为DSP串口驱动程序的入门代码使用(DSP serial port driver, beginners as DSP serial port driver entry code uses)

GPS信号仿真，包括信号生成，捕获仿真等内容。(GPS signal simulation, including signal generation, capture, simulation, and other content.)