TITLE: 'H' symbol as a power of matrix
QUESTION [8 upvotes]: Here is capture of problem

That is what I saw while I was studying maximum ratio combining (MRC) in communication.
It is probably very simple and stupid thing to ask. 
I guess it is Hermitian of a matrix but i am not sure..
Here is entire content: http://www.dsplog.com/2008/09/28/maximal-ratio-combining/

REPLY [8 votes]: You are right in that it is the Hermitian transpose.
Essentially, it is the standard transpose of a matrix, except in addition to swapping row/column indices, you also take the complex conjugate of the entry:
$$ a^H_{ij} = \bar{a}_{ji}$$