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For a normalized block LMS filter whose tap input at time n is an L$-$by$-$ M matrix

A$($n$)=[$u$($n$),$u$($n$-1),$cdots,u$($n$-$M$+1)],$ the weight vector can be updated using the

equation: w$($n$+1)=$w$($n$)+$A$^($T$)($n$)($A$($n$)$A$^($T$)($n$))^(-1)$e$($n$).$

aL and M $?$

cA$($n$)$A$^($T$)($n$)$ is non$-$inversible?

d