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(1) 在某些无线信道中，多普勒频移会引起无线信道输出信号的混叠。请描述产生混叠的各种原因； (2) 无线信道中的多普勒谱有一种经典谱(classic spectrum)，请解释产生这种谱形状的机理； (3) 请用Simulink工具编写代码(S-Function方式)，产生一单径瑞利信道，其多普勒谱为经典谱，其中移动速率为120km/h。并请回答：证明自己用计算机产生的经典谱是正确的可能方法。 ((1) in certain wireless channel, the Doppler frequency shift will be caused by wireless channel output signal aliasing. Please describe the resulting aliasing of a variety of reasons (2) wireless channel Doppler spectrum there is a classical spectrum (classic spectrum), please explain such a spectral shape of the mechanism (3) Please use Simulink tools for writing code ( S-Function mode), resulting in a single Path Rayleigh channel, the Doppler spectrum for the classical spectrum, including mobile rate of 120km/h. And please answer: prove that they used computer-generated classical spectrum is correct possible ways.)

texture feature extraction insert into on the basis of rgb colore image clustering methods

模拟 AM FM DSB 信号傅里叶变换图 频域稀疏(Analog AM FM DSB frequency domain signal sparse Fourier transform Figure)

wimax matlab patch file

介绍一种球度误差评价方法的文章，很不错，值得深入研究(This is a new strategy and means for sphericity form error evaluation.)

我们卫星定位导航课中导航中双历元GNSS辅助SINS动态初始对准方法的m文件，只要有测量数据应该就可以实现，大家可以参考一下(Our lesson navigation satellite positioning and navigation double epoch dynamic GNSS assistance SINS initial alignment method m file, as long as the measurement data should be able to achieve, we can refer to)

susan算法角点检测算法matlab源程序(susan corner detection algorithm algorithm matlab source)

matlab仿真双级矩阵变换器的逆变程序，包括判断扇区，计算相位角等(matlab simulation of two-stage matrix converter inverter procedures, including the judge sectors, calculating the phase angle)

设计一个程序，用后向Euler 法/梯形法求解电路系统的MNA 方程（该方程由stamp 程 序得到），其中线性方程的求解采用GCR 迭代法。(Design a program that uses the backward Euler method/trapezoid method for solving circuit system MNA equation (the equation obtained by the stamp program), in which the linear equations using GCR iteration.)

给定三点坐标（二维），得到圆的圆心及坐标，并在matlab中坐图画出圆，并在图中标注原有圆的位置(Given three coordinates (2 d), get the round circle and coordinates, and sit in the matlab picture out of the circle, and mark the location of the original circle in the picture)