longtraining.m

来自「OFDM的PHY发射端matlab实现程序」· M 代码 · 共 35 行

function longout=longtraining()
k=-26:26;
S=ones(1,length(k));
for i=1:53
    if i==3||i==4||i==7||i==9||i==16||i==17||i==20||i==22||i==29||...
        i==30||i==33||i==35||(i>=37&&i<=41)||...
        i==44||i==45||i==47||i==49
        
        S(i)=-1;
    elseif i==27
        S(i)=0;
    end
end
    longS=S;
    ltraining=zeros(1,64);
    for i=1:26
        ltraining(i+38)=longS(i);
    end
    for i=28:53
        ltraining(i-26)=longS(i);
    end
    longtraining=ifft(ltraining);
    kuozhan=[longtraining,longtraining,longtraining(1)];
    n=length(longtraining);
    cyclicprefix=longtraining(n-31:n); 
    longkuo=[cyclicprefix,kuozhan];
    W=zeros(1,161);
    for k=1:161
        if k==1||k==161
            W(k)=0.5;
        elseif k>=2&&k<=160
            W(k)=1;
        end
    end
   longout=longkuo.*(W);