4.3.Asymptotic Spectral Distributions for Hermitian matrix Under these model assumptions,irrespective of the communication scenario under study(e.g.MIMO,CDMA),the minimum mean square error decoder output for the vector x reads: =(H"H+G2IH"y =H"(H+o21w)）厂y For practical applications,recovering therefore requires the inversion of the potentially large (HHH+021)matrix. 1010 4.3. Asymptotic Spectral Distributions for Hermitian Matrix Under these model assumptions, irrespective of the communication scenario under study(e.g. MIMO, CDMA), the minimum mean square error decoder output for the vector x reads: For practical applications, recovering therefore requires the inversion of the potentially large (HHH+σ2 In ) -1 matrix. x ˆ     1 H 2 H 1 H H 2 ˆ n N         x H Η I H y H ΗH I y x ˆ