Full_wave_bridge_rectifier

This is the matlab code of filter bank design.

simulation of communication systems and software defined radio matlab codes from the book

说明：  线性方程组的各种解法：求逆法、分解法、迭代法、特殊解法、非奇次线性方程组的解法(A variety of linear equations method: inverse method, decomposition method, iterative method, a special solution, non-singular at the solution of linear equations)

以软件为主的方法实现QRS波的检测滤波之后的信号一般经过一些 变换以提高QRS波的份量，进而采用一系列阈值进行判别，这些阈值有固定 阈值法，也有可变阈值法。前者由于可能的干扰或高P、高T波的存在，若 其滤波后超过其阈值便会产生假阳性(FP，falsepositive)结果；另外，当心 律失常或QRS波幅度变小，阈值设置过高，会导致漏检产生假阴性(FN， falsenegative)结果。由于固定阈值的这些缺点，有研究者提出了用可变阈 值检测，以提高检测的精确率，所采用的可变阈值包括幅度阈值、斜率阈值 和时间间隔阈值等。(Give priority to with software method for detecting QRS wave signal after some commonly after filtering Amount of transformation in order to improve the QRS wave, then using a series of threshold to distinguish, the threshold value is fixed Threshold value method and variable threshold value method. The former due to the possible interference or the existence of the high P and T waves, if More than the threshold value is created after the filtering false positives (FP, falsepositive results In addition, be careful Law of disorder or QRS wave amplitude decreases, threshold is set too high, can lead to leak to produce false negatives (FN, Falsenegative) results. Due to these disadvantages of fixed threshold, some researchers have proposed using variable threshold Value detection, in order to improve the precision of detection rate, adopted by the variable threshold including amplitude threshold, the slope threshold And the time interval threshold, etc.)

这是一个关于MATLAB的优化的有关问题，具有一定的参考价值，希望对大家有帮助。(This is a study on the relevant MATLAB optimization problems, has a certain reference value, and they hope to help everyone.)

说明：  利用平面波展开发计算二维光子晶体的能带结构(Show the development of the use of plane-wave calculation of two-dimensional photonic crystal band structure)

对信号计算11/2维切片谱，可用来分析二次相位耦合检测。(Calculation of signal 11/2 dimension slice spectrum can be used to analyze the quadratic phase coupling detection.)

伪随机码调相来实现定距的作用，伪随机码的自相关性有很好的定距性能(the pseudo--random code)

说明：  波达方向（DOA） 估计的基本问题就是确定同时处在空间某一区 域多个感兴趣的信号的空间位置(即多个信号到达阵列参考阵元的方 向角)。最早的也是最经典的超分辨率(DOA)估计算法是著名的多信号 分类（Multiple Signal Classification） 法,简称 MUSIC 算法,它是 一类经典的基于特征结构分析的空间谱估计方法。该算法利用了信号 子空间和噪声子空间的正交性,构造空间谱函数,通过谱峰搜索,检测 信号的 DOA。(The basic problem of DOA estimation is to determine the simultaneous location in a certain region of space. Spatial position of multiple interested signals in the domain (i.e. the direction of multiple signals reaching the array reference elements) Directional angle). The earliest and most classical super-resolution (DOA) estimation algorithm is the well-known multi-signal.Multiple Signal Classification, referred to as MUSIC algorithm, is A classical spatial spectrum estimation method based on eigenstructure analysis. The algorithm utilizes signals. The orthogonality of subspace and noise subspace, the construction of spatial spectral function, through peak search, detection DOA of signal.)

在matlab环境下的二维双曲型和抛物型偏微分方程的数值解法(Matlab environment in two-dimensional hyperbolic and parabolic partial differential equations numerical solution)