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example4_3
例3：分析占空比为ta的矩形脉冲频谱
T=1 时间窗大小
ta=0.5 占空比
N=256
t=linspace(-T,T,N)
ts=2*T/N
fs=1/ts
(x=zeros(1,N)
x(N/2-round(N/2*ta):N/2+round(N/2*ta))=ones(1,2*round(N/2*ta)+1)
y=fft(x,N)
figure
plot(t,x)
title([ 时域信号图 占空比为 ,num2str(ta)])
axis([-T T-0.2 1.2])
xlabel( t /s )
figure
subplot(211)
f=linspace(-fs/2,fs/2,N)
plot(f,abs(fftshift(y))/N)
title([ 矩形脉冲双边谱 脉冲时间t=[- ,num2str(ta*T), , ,num2str(ta*T), ] ])
xlabel( f /Hz )
)
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PWM
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mean
matlab programme to find mean value
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para
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OFDM_synchronous-
说明： 讲解OFDM无线系统同步方案。提出了两种同步方案。(Master s thesis about
The methods of OFDM synchronization )
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用MATLAB实现领域平均法抑制噪声程序，可以达到较好的去噪效果(MATLAB areas with average method to achieve noise suppression program, you can achieve better denoising effect)
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ID3-face
MATLAB编写的基于决策树的ID3算法实现，模式识别，人脸识别。压缩包中包含两个源文件和测试图片，ID3源文件为主代码，fi为求熵函数。(MATLAB prepared based on the ID3 decision tree algorithm, pattern recognition, face recognition. Compressed package contains two source files and test images, ID3-based source code files, fi for the sake of entropy.)
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基于多频（三频）的离散频谱校正，应用比值法，加矩形窗和汉宁窗。(Discrete spectrum correction based on the multi-frequency (C-band), the application of the ratio method, plus a rectangular window and Hanning window.)
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