rdt

GRE的学习资料，很全的大全~~~想出国的同学注意了~(GRE study materials, it is the whole of the Daquan ~ ~ ~ want to go abroad students attention ~)

自编的信号相关性计算的函数，可以应用于两组数据互相关的计算(Composing the signal correlation calculation functions, can be applied to the calculation of two sets of data cross-correlation)

计算时间序列的延迟时间，有例子，一看就明白啊！(The time series‘delay time is calculated , there is an example!)

matlab project synchronous machine modeling

,在强干扰中提取信号,不仅要求有一定的信噪比,而且必须对信号作恒虚警处理.在自动检测系统中,对一定的检测门限来说,当干扰电平增大几分贝,虚警率就会大大增加,致使显示器画面饱和或计算机过载,这时即使有足够大的信噪比,也不可能做出正确的判决.为此在自动检测雷达中,必须具备恒虚警处(, extracting signal in strong interference, not only requires a certain signal-to-noise ratio, and must make constant false alarm processing for signal. In the automatic detection system, for a certain detection threshold, when the noise level increases, a few decibels will greatly increase the false alarm rate, led display screen saturated or computer overload, even if there is enough SNR at this moment, it is impossible to make the right decision. Therefore in the automatic detection of radar, must have a constant false alarm)

小波包分析提取振动信号中的特征频率，基于分段非线性权重值的Pso算法，包括调制，解调，信噪比计算。( Wavelet packet analysis to extract vibration signal characteristic frequency, Based on piecewise nonlinear weight value Pso algorithm, Includes the modulation, demodulation, signal to noise ratio calculation.)

本程序利用平方环实现载波同步，使用锁相环进行跟踪相位偏移(This program makes use of the square ring to achieve carrier synchronization, with the use of PLL to track the phase shift)

用matlab仿真实现了25 kHz 带宽内同时传送总共48 kbit/s 的两路语音(每路速率9. 6 kbit/s) 和两路数据信息(速率分别为19. 2 kbit/s 和9. 6 kbit/s) , 仿真结果表明达到了较好的误码性能。并比较了4 种数字调制方式下O FDM 系统的误码性能。(using Matlab Simulation bandwidth of 25 kHz simultaneous transmission within a total of 48 kbit/s 2 Road Voice (rate of 9 per road. 6 kbit/s) and two road data information (rate of 19. 2 kbit/s and 9. 6 kbit/s), the simulation results indicate achieve a better BER. And comparison of four types of digital modulation mode O FDM system BER.)

这是个改进的PCA主元分析程序 可以实现数据降维和压缩(This is a PCA improved principal component analysis program can reduce the dimensionality of data compression )

小波包分析提取振动信号中的特征频率，利用matlab GUI实现的串口编程例子，自写曲率计算函数 。( Wavelet packet analysis to extract vibration signal characteristic frequency, Use serial programming examples matlab GUI implementation, Since writing the curvature calculation function.)