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MIMO MMSE receiver ????

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ahmeddeia

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Salam alikom all

well my question is

why in the MMSE equation for H matrix is

G = (H' * H + 1/(10^(0.1*snr_ratio))*eye(N)) \ H'; in some references as in MIMO book of Andrea Goldsmith



and it is G = (H' * H + Nt/(10^(0.1*snr))*Nt*eye(N)) \ H'; in other references as in matlab help, where Nt is number of Tx antennas

in brief, why we add Nt in MMSE equation??? because the power is normalized (i.e snr_ratio / Nt) thus the second equation is correct for normalized Tx signal and the first one is correct for non- normalized Tx signal??


thanks,

salam alikom
 

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