Charlotte Blair
Ansys Employee
 The signal present at the antenna of the receiver consists of a mixture of the desired signal with noise. In addition to that, the signal level will be very low because of the attenuation caused by the medium resulting in low signal to noise ratio (SNR). This signal level will not be sufficient enough to be decoded by the other components of the receiver. In addition, using a low noise amplifier (LNA) as the receiver front end will decrease the overall noise figure.