I read the following article describing the RF chain of OpenBTS will be
In the “RX/TX isolation” part, it says that “The USRP outputs noise in
receive band about 80 dB below the transmit signal level, or around -60
dBm.”. Does the USRP outputs noise in the receive band mean the out-band
leakage of transmitted signal? And why it is around 20dBm - 80dB =
but not 36dBm - 80dB = -44dBm. In my opinion, the leakage signal is also
amplified by PA.