shijiandaima

加arnold置乱的数字水印在matlab下的ＤＦＴ仿真实现整个程序运行还行，共享给大家-jpeg of the Matlab Simulation, and the whole process has run OK, for everyone to share (Add arnold Scrambling of digital watermarking in matlab under the DFT simulation run also realize the whole process line, to share to everyone-jpeg of the Matlab Simulation, and the whole process has run OK, for everyone to share)

In this paper, we have proposed a new PAPR reduction technique in MIMO-OFDM systems. It achieves the result which proves the PAPR of 2×2 MIMO-OFDM systems. The parameters of the simulation are determined by standard IEEE 802.11n. From the simulation results, it is shown the proposed method has better PAPR performance in this system. Additionally, when the number of sub-blocks is increased, high PAPR reduction performance can be obtained.

声信号指标分析,包含声压级和频谱分析，算法和具体程序(index analysis for sound signal，including the sound pressure and frequency analysis)

It should be noted that there is still room to improve the speed and the memory usage of the algorithms, using for instance displacement structure algorithms for the RQ decomposition and Lanczos algorithms for the SVD.

从一个三维图像中取得上面各点的形状索引以及曲率。(get the shape index and curedness from a 3D range image)

通过传输矩阵法计算线性啁啾光纤光栅和高斯变迹光纤光栅的时延和反射谱曲线(Grating Through the transfer matrix method to calculate the linear chirped fiber grating and fiber Bragg grating Gaussian apodization of the delay and reflection spectrum curve)

散傅里叶变换的性质 一、 实验目的 1、 掌握离散傅里叶变换的性质，包括线性特性、时移特性、频移特性、对称性和循环卷积等性质； 2、 通过编程验证傅里叶变换的性质，加强对傅里叶变换性质的认识。 (The nature of the discrete Fourier transform, the purpose of the experiment 1, to grasp the nature of the discrete Fourier transform, including a linear characteristic, when the shift characteristic frequency-shift characteristic, symmetry, and the circular convolution nature 2, through the programming verification Fu li the nature of the Fourier transform, to enhance the understanding of the nature of the Fourier transform.)

说明：  使用matlab语言编写的三种PID优化程序，通过对比展示优化效果(Using MATLAB language to write three kinds of PID optimization program, through the comparison to show the optimization effect)

说明：  运动方程中的速度向量和加速度向量用位移的某种组合来表示，将微分方程组的求解问题转化为代数方程组的求解问题，并在时间区间内求得每个微小时间区间的递推公式，进而求得整个时程的反应。 中心差分法是一种显示的积分法，它基于用有限差分代替位移对时间的求导（即速度和加速度）。(Velocity vectors and acceleration vectors in motion equations are expressed by a combination of displacements. The problem of solving differential equations is transformed into the problem of solving algebraic equations. The recurrence formulas of each small time interval are obtained in the time interval, and then the response of the whole time interval is obtained. The central difference method is a display integration method, which is based on the finite difference method instead of the displacement derivative of time (i.e. velocity and acceleration).)

俄罗斯方块的MATLAB版，其中附源代码。(The MATLAB version of Tetris, including the source code attached.)