4.3.Asymptotic Spectral Distributions for Hermitian Matrix Example 4.3.5:MMSE detector with low complexity Consider the following communication channel y=Hd+n with d=ddC"some transmitted vectorial data of dimension n,assumed to have zero mean and covariance matrix n,nCN is an additive Gaussian noise vector of zero mean and covarianceI,y=CNis the reccived signal,and HCNx"is the multi-dimensional communication channel. 99 4.3. Asymptotic Spectral Distributions for Hermitian Matrix Consider the following communication channel with some transmitted vectorial data of dimension , assumed to have zero mean and covariance matrix In , is an additive Gaussian noise vector of zero mean and covariance IN , is the received signal, and is the multi-dimensional communication channel. y Hd n     T 1 ,..., n n d   d d n N n   T 1 ,..., N n y   y y N n H Example 4.3.5：MMSE detector with low complexity 2 