Lecture8_exc_2

This is a code to Object detection based on SSD

说明：  信号产生的子程序以及系统单位脉冲响应序列长生子程序(Signal generated by the subroutine and the system unit impulse response sequence routines longevity)

matlab教材附带的代码 可以运行.关于通信方面的仿真。(the matlab code about communitinication)

dual tree discrete wavelet transform (dtdwt) matlab codes

discrete continuous transform used in mobile communication, perfectly analyzed.

卡尔曼滤波不错的程序，很实用，大家好好研究一起分享一起进步吧(Kalman filtering good program, very practical, we make good progress in research to share with the Bar)

说明：  计算一系列值出现的频数，并作出极坐标图，在地理坡向中很有用(Calculated the frequency range of value occurs, and to make Polar, is useful in geographical aspect)

FRFT 具体的程序，有关天处理LFM信号的，特别好。(FRFT specific procedure, the days of LFM signal processing, particularly good.)

This M Code simulate the effects of clipping and filtering on PAPR PAPR reduction in OFDM-based wireless standard.Also the performance of BER versus SNR of original OFDM signals with PAPR reduction based on clipping and filtering schemes over AWGN channel is evaluated. The simplest and most widely used technique of PAPR reduction is to basically clip the part of signals that are outside the allowed region.Clipping methode introduces both in band distortion and out of band radiation into OFDM signals which degrades the performance including the BER and spectral efficiency.Filtering can reduce out of band radiation after clipping although it can not reduce in-band radiation distortion.However, clipping may cause some peak regrowth so that the signal after clipping and filtering will exceed the clipping level at some point.To reduce peak regrowth a repeated filtering and clipping operation can be used to obtain a desirable PAPR at a cost of computational complexity increase.

在matlab上画出三个脑电信号的图像，并进行对比(Draw three EEG images on matlab, and compare)