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firstly i must say i dont know extremely well OFDM but i can say something that can be useful for you
if notation Y=XH+W ;
LS estimation makes X^-1 Y = H + X^-1 W so if channel has no noise we get H perfectly but this is imposibble in real life so we want to reduce effect of noise.. if W was...
u can use this circuit diagram.. i get nearly original ecg signal. **broken link removed**
figure shows my ecg signal..
also i share circuit diagram that i used..
(the last part of circuit is T twin 50hz noise filter)
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