MATLAB脉冲成型

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Fd=1;  Fs=8;   Delay=3;   R=0.5;   [yf,tf]=rcosine(Fd,Fs,'fir/sqrt',R,Delay);  figure(1);plot(yf); grid;title('根升余弦滤波器时域波形')x=randint(100,1)*2-1;%原始输入信号为+1,-1码    xt=zeros(1,800);    xt(1:8:end)=x; %%插值后信号y1=filter(yf,tf,xt); %%成型滤波  y2=filter(yf,tf,y1); %%用与发送端相同的根升余弦匹配滤波yt=y2((size(yf)+1)/2:8:end);%%匹配滤波后抽取        figure(2);    stem(x(1:40)); grid;title('原始信号输出');figure(3);plot(y1(1:100));grid;title('成型信号输出');figure(4);plot(y2(1:100));grid;title('匹配滤波信号输出');figure(5);    stem(yt(1:40)); grid;title('抽取后信号输出') ;

滤波器的截止频率是Fd/2;Fs/Fd是内插倍数;其频响可以由滚降系数和窗长(FIR阶数)确定。 
delay * (Fs / Fd) * 2 + 1就是滤波器的阶数 
                                             
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