I need to get the channel gains for forward and reverse links in a TDD system using two USRPs that tx and rx at the same time or with some small time delay(TDD mode). All the examples I have come across are not for TDD since there is always one link. I want to know if it is possible to design a transceiver that can operate in TDD mode where the channel gains for uplink and downlink can be obtained for onward processing? Your help would be appreciated. Thank you for helping