fir_lin_phase_lowpass_max_atten

基于matlab的图形图象加密算法，对图形图象进行行列变换，达到对图象进行加密的功能。(Matlab-based graphical image encryption algorithm, to transform the ranks of graphics images to be encrypted on the image function.)

这是一个完整的OFDM仿真程序，直接运行main_ofdm.m文件就可以打开(This is a complete OFDM simulation program, run directly main_ofdm.m file can be opened)

英文原版书籍《MATLAB Programming With Applications for Engineers》中例子及课后习题代码(Code of the book《MATLAB Programming With Applications for Engineers》)

说明：  代码介绍全局平滑约束下的基于梯度光流法的MATLAB实现(Code describes the global smoothness constraint optical flow method based on the gradient of the MATLAB implementation)

巴特沃斯滤波器设置，自行设置阶数、截止频率等滤波器参数(butter-worth filter)

有关FFT和低通滤波器的实例，简洁实用，很有针对性，已经运行通过(The FFT and low-pass filter example, simple and practical, very targeted, has been running through the)

In this paper, we propose and investigate a lowcomplexity human motion tracking system which is based on ultra-wideband (UWB) radio nodes.

简单的PID串级控制matlab仿真实例(PID Cascade Control matlab simulation examples)

波达方向（Direction Of Arrival）估计，又称为谱估计（spectral estimation）、波达角（Angle Of Arrival）估计。一个信源有很多可能的传播路径和到达角。如果几个发射机同时工作，每个信源在接收机处形成潜在的多径分量。因此，接收天线能估计出这些到达角就显得很重要，目的是破译出哪个发射机在工作以及发射机所处的可能位置。通过测量辐射信号的波达方向（DOA全称Direction Of Arrival）或波达角（AOA）来估测辐射源的位置。理论上这种估计只需要两个接收阵元就可以确定辐射源的位置，但在实际中，由于受到角度分辨率、多径和噪声限制，所需阵元通常要多于两个。DOA定位技术原理是利用接收机处的阵列天线和波达方向（DOA）估计技术来确定一个从接收机到信源的波达方向线，即为方向线（LOB），最后利用多个接收机估计的DOA进行三角测量，方向线的交点就是信源的估计位置。(DOA (Direction Of Arrival) estimation , also known as spectral estimation (spectral estimation), angle of arrival (Angle Of Arrival) estimation. There are many possible sources a propagation path and the angle of arrival . If several transmitters simultaneously, a potential source for each multipath component at the receiver. Therefore, the receiving antenna can estimate the angle of arrival becomes very important, which aims to decipher the location of the transmitter at work as well as possible in which the transmitter . By measuring the radiation signal DOA (DOA stands for Direction Of Arrival) or the angle of arrival (AOA) to estimate the location of the radiation source . Theoretically this estimate requires only two receiving array element can determine the position of the radiation source , but in practice , due to the angular resolution , multipath and noise limits , usually required more than two array elements . DOA positioning technology is the use of an array of antennas at)

说明：  BPSK的调制解调以及误码率等的matlab仿真(BPSK modulation and demodulation, and bit error rate of matlab simulation)