MIMO-OFDM的matlab实现

Clovin

帖子里MIMO-OFDM的matlab实现代码 STBC解码
for i=1:1:Nc
    Xe(i,1)=(R11(i)*conj(H11(i))+conj(R12(i))*H21(i)+R21(i)*conj(H12(i))+conj(R22(i))*H22(i))/( H11(i)*conj(H11(i)) + H21(i)*conj(H21(i)) + H12(i)*conj(H12(i)) + H22(i)*conj(H22(i)));
    Xo(i,1)=(R11(i)*conj(H21(i))-conj(R12(i))*H11(i)+R21(i)*conj(H22(i))-conj(R22(i))*H12(i))/( H11(i)*conj(H11(i)) + H21(i)*conj(H21(i)) + H12(i)*conj(H12(i)) + H22(i)*conj(H22(i)));
end
output=2*[Xe Xo];

这里输出为什么是2*[Xe Xo]？