Multi-stage isolation sub-system for a remote antenna unit
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United States of America Patent
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Oct 16, 2018
Grant Date -
Jan 25, 2018
app pub date -
Aug 17, 2017
filing date -
Jan 27, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
Certain features relate to a remote antenna unit having a multi-stage isolation sub-system for isolating uplink and downlink signal paths. A multi-stage isolation sub-system in the remote antenna unit can include a first stage device that is configured to generate a cancellation signal for canceling unwanted downlink signals received at the uplink antenna. The isolation sub-system can also include a second stage device configured to generate a cancellation signal that attenuates residual noise and intermodulation products generated in the downlink path and received in the uplink path. The multi-stage isolation sub-system can combine the cancellation signals with signals received on the uplink path in order to cancel or attenuate downlink leakage signals and residual noise present on the uplink path.
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