chap12_Wavelet-transform

four quadrant induction motor

对采集到的信号进行快速傅里叶变换，可以实现对信号频谱分析(The collected signals fast Fourier transform, spectral analysis of the signal can be achieved.)

这是较好的Matlab源代码，希望此代码能对大家有所帮助。(This is a better Matlab source code, I hope this code can be helpful to everyone.)

使用meashift方法做的平滑和分割算法，用matlab写的(Meashift methods make use of the smoothing and segmentation algorithm, written using matlab)

包含在word中提到的大部分同步算法，包括时间和频率同步(It contains most of the synchronization algorithm in the word mentioned, including time and frequency synchronization)

实现扩频CDMA系统的仿真，并实现不同用户数下误码率的输出(can present the simulation of dsCDMA)

matlab important program file

本程序设计了一个数字低通滤波器，以滤除加入的高斯白噪声，很好的实现功能。(The program design of a digital low-pass filter to filter out the add white Gaussian noise, achieve good function.)

基2 fft 的c++实现，改自matlab。(fft)

说明：  升余弦滚降的误码率和信噪比曲线，取样时间无偏差，但信道是多径信道，衰减系数0.5 傅立叶变换及反变换参见t2f-and-f2t(Raised cosine roll-off of the bit error rate and signal to noise ratio curve, sampling time deviation, but the channel is a multipath channel, the attenuation coefficient of 0.5 Fourier Transform and inverse transform see t2f-and-f2t)