n.太空(太陽空間)
After sunspace decomposition, the close form solution of channel matrix could be obtained, according to the orthogonality of signal subspace and noise subspace. 然后求出重構(gòu)信道矩陣的噪聲子空間，之后利用信號子空間與噪聲子空間正交特性，構(gòu)造出信道矩陣作為變量的線性方程組，因而可以得到信道矩陣的閉式解。
