lab2.asv

Matlab 模拟 CDMA 直接扩频。m序列生成矩阵为p(x) = 1 + x^5 + x^7 + x^8 + x^9 + x^13 + x^15。能画出每阶段的时域、频域图。

%==>== DECODE ====%

DecOut = zeros(1,SLENGTH);
for i = 1:SLENGTH
    % in case!
    if ABYTE(2,i) == 0,
        preByte = (1/2)^7;
        preByte1 = 0;
    else
        preByte = (1/2)^(8-ABYTE(2,i));
        preByte1 = preByte;
    end
    DecOut(i) = (-1)^(ABYTE(1,i))*...
                (preByte1+...
                preByte*(ABYTE(3,i))/16);
end
DecOut;

stairs (DecOut, 'DisplayName', 'DecOut'); figure(gcf)
%stairs(DecOut-UniS); figure(gcf2)