How do I expand the following matrix? I have no experience in linear algebra (well 35 years ago..)
Its the equation just after equation 16b in this link
Here are the equations in question:
$$ \begin{bmatrix} Y_m(n) \\ {Y^*}_{-m}(n) \\ \end{bmatrix} = {K_m}^{-1}$$
$$ \begin{bmatrix} Z_m(n) \\ {Z^*}_{-m}(n) \\ \end{bmatrix} = {K_m}^{-1}{K}_m\begin{bmatrix} Y_m(n) \\ {Y^*}_{-m}(n) \\ \end{bmatrix} $$
Where $$ K_m = \begin{bmatrix} K_{1m} & K_{2m}\\ K_{2m}^* & K_{1m}^* \end{bmatrix} $$