watermark-and-psnr

it is the file which consists of ofdm using matlab

QAM调制和解调的matlab实现，瑞利信道，高斯白噪声(QAM modulation and demodulation matlab implementation, Rayleigh channel, Gaussian white noise)

image processing for manipulation pixel of every image with different method

用matlab 的simulink 仿真PAM调制与解调模块。(using the simulink of the matlab simulinking the modulation and demoduation system of the PAM)

三种PN序列自相关性分析，和循环移位互相关分析gold，小m序列，walsh码(Three kinds of PN sequence from the correlation analysis, and rotate the cross-correlation analysis, contants gold, small m sequence, walsh code)

pss simulink to show the behavier of system

能够测试不同码率（1/2,1/3）的卷积码在awgn信道下的性能(To test different bit-rate (1/2, 1/3) convolutional codes in awgn performance under channel)

说明：  用matlab实现的曼彻斯特编码。50 占空比（可调）。绘制时域波形和频域功率谱密度。结果跟北邮的郭文斌的通信原理课件上的形状一模一样。(Manchester encoding with a matlab implementation. 50 duty cycle (adjustable). Draw time-domain waveform and frequency domain power spectral density. The results with the Beijing University of Posts and Telecommunications of the GUO of communication theory on the shape of the same courseware.)

一个duffing模型，一个噪声模型，一篇duffing检测原理，。可检测不同频率的待测信号(a duffing model, a noise model, a duffing detection principle)

Field of Digital Communications. Topic: Diversity Combining Matlab Program (m File) for exploiting Receiver Antenna Diversity: Maximal Ration Combining (MRC)