LFM_radar_signal

等温线，matlab等温线经典程序，内置数据(Isotherms)

编程产生一组随机的0、1二进制比特序列，分别用2ASK, 2FSK, 2PSK和2DPSK四种调制方式把它们调制到一个较高的载频上，调制参数自定，请给出前8个比特所对应的时域波形。 画出上述四种信号通过高斯白噪声信道后的相干解调器和非相干解调器的原理框图，并给出判决前的观测值的数学表达式。注: 如果某些调制方式无法进行非相干解调，请给出原因。 根据题2中的观测值的数学表达式，分别编程实现判决过程，将判决结果与原数据作比较，统计出各自在不同比特信噪比 值下的误比特率 ，然后画出 与 (dB)的曲线。建议 的范围为 0dB 到10dB, 以1dB为间隔。 将上述仿真得到的误比特率曲线与各自的理论值画在同一张图上进行比较并讨论。同时， 比较和讨论不同调制与解调方式的差错性能区别。(emulate 2ASK, 2FSK, 2PSK and 2DPSK using matlab)

说明：  应用music算法和esprit算法在进行谱估计中的matlab源程序 (Music and esprit algorithm application in spectral estimation algorithm in the matlab source code)

MUSIC算法是一种基于矩阵特征空间分解的方法。从几何角度讲，信号处理的观测空间可以分解为信号子空间和噪声子空间，显然这两个空间是正交的。信号子空间由阵列接收到的数据协方差矩阵中与信号对应的特征向量组成，噪声子空间则由协方差矩阵中所有最小特征值（噪声方差）对应的特征向量组成。MUSIC算法就是利用这两个互补空间之间的正交特性来估计空间信号的方位。噪声子空间的所有向量被用来构造谱，所有空间方位谱中的峰值位置对应信号的来波方位。MUSIC算法大大提高了测向分辨率，同时适应于任意形状的天线阵列，但是原型MUSIC算法要求来波信号是不相干的。(MUSIC algorithm is a matrix decomposition method based on feature space. From the geometric point of view, the observed spatial signal processing can be decomposed into signal subspace and noise subspace, it is clear that the two spaces are orthogonal. The signal received by the array to the subspace of the covariance matrix of the signal component corresponding eigenvectors, the noise subspace of the covariance matrix of all by the smallest eigenvalue (noise variance) eigenvectors corresponding to the composition. MUSIC algorithm is the use of orthogonal properties between these two complementary space to estimate the spatial orientation of the signal. Noise subspace of all vectors are used to construct the spectrum, all the spatial orientation of the spectrum corresponding to the peak position of the signal wave direction. MUSIC algorithm greatly improves the resolution measurements, while the antenna array adapted to any shape, but the prototype MUSIC algorithm requires to wave sign)

说明：  matlab 矩阵及其基本运算（命令及其用法）matlab基础(matlab matrix and the basic operations (command and its usage) matlab basis)

说明：  hurst 指数计算程序 提示：先导入（import）时间序列数据，再进行计算。(hurst Index hints: first import (import) time-series data, and then calculated.)

performs canny edge detection algorithm using matlab platform

语音信号的时域波形和频域波形，简单易懂，利用FFT实现。另加语音端点检测文献一篇(Speech signal time domain waveform and frequency domain waveform, straightforward, using FFT to realize )

QAM调制仿真程序，在AWGN和瑞利衰落信道下仿真，适用于初学者。(QAM modulation simulation program, in the AWGN and Rayleigh fading channel simulation, applicable to beginners.)

求解非线性最化的局部最优解,matlab,matlab例程(Most of solving nonlinear partial optimal solution, matlab, matlab routines)