The MMSE is computed using (H^H*H + N*I)^-1. While computing the MMSE
term H^H*H + N*I before the inverse, the term H^H*H is scaled using
shift (log2_max). However, the term N (noise) is not scaled. The fix scales the
noise term using the shift.
Signed-off-by: Rakesh Mundlamuri <rakesh.mundlamuri@openairinterface.org>
Fixes: 1b77adcb ("Segregate the LLR and channel compensation related common functions into different files")