Multi-stage isolation sub-system for a remote antenna unit

A method, comprising:

• generating a first cancellation signal comprising an inverse signal characteristic as compared to a downlink leakage signal received on an uplink channel by a radio circuit;
• generating a second cancellation signal for attenuating residual downlink noise and downlink intermodulation products received on the uplink channel;
• attenuating the downlink leakage signal by combining the first cancellation signal with signals received on the uplink channel;
• and
• attenuating the residual downlink noise and downlink intermodulation products by combining the second cancellation signal with the signals received on the uplink channel.

A remote antenna unit, comprising:

• a multi-stage isolation sub-system communicatively coupled to an uplink antenna and a downlink antenna, the multi-stage isolation sub-system comprising:
• a first stage device configured to generate a first cancellation signal to attenuate a downlink leakage signal received at the uplink antenna, the first cancellation signal comprising an inverse signal characteristic as compared to the downlink leakage signal received at the uplink antenna;
• and
• a second stage device, communicatively coupled to the first stage device, the second stage device configured to generate a second cancellation signal to attenuate residual downlink noise and downlink intermodulation products received at the uplink antenna.