looks like they are using multiple radios on the same frequency and then also are able to overcome self-interference. I read an IEEE article about receiving an

looks like they are using multiple radios on the same frequency and then also are able to overcome self-interference. I read an IEEE article about receiving and transmitting on the same frequency at the same time by subtracting the transmitted signal from the received to get only the signal from the remote radio. from their website " Perfect cancellation of co-channel interference " They also mention 'beamforming'.