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Normalization of Channel?

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If hsd is a rayleigh channel generated in matlab. Do we need to add the second code line (bold italic) below?
hsd = (randn(1) + j*randn(1)) / sqrt(2);
hsd = hsd / sqrt(hsd * hsd');

Also what this last code line (in bold italic) does?

Waiting....
 

In some applications (or user defined assumptions) the channel coefficient power (or channel impulse response power ) should be 1.
and the 2nd line would do it .
 

and can we say that:

** There is no need to use the second line ( hsd = hsd / sqrt(hsd * hsd') ) in case of SISO if at the reciever we are doing Zero Forcing, i.e., dividing the recieved signal by channel ( hsd= (randn(1)+randn(1)) / sqrt(2) ).

**We should include this normalization ( hsd = hsd / sqrt(hsd * hsd') ) in case of MIMO systems when there is no Zero Forcing at the reciever rather we use Maximum Ratio Combining.

Plz tell if above statements are correct.

Waiting
 

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