Broadband distributed antenna system with non-duplexer isolator sub-system
View Patent ↗Certain aspects and aspects of the present invention are directed to a distributed antenna system having a downlink communication path, an uplink communication path, and a non-duplexer isolator sub-system. The downlink communication path can communicatively couple a transmit antenna to a base station. The uplink communication path can communicatively couple a receive antenna to the base station. In one aspect, the non-duplexer isolator sub-system can be electronically configured for isolating uplink signals traversing the uplink communication path from downlink signals. In another aspect, a non-duplexer isolator sub-system can be configurable in one or more mechanical steps selecting a frequency response. In another aspect, a non-duplexer isolator sub-system can include an active mitigation sub-system.
1. A non-duplexer isolator sub-system for a distributed antenna system, the non-duplexer isolator sub-system comprising:
an electronically configurable filter positioned in at least one of:
a downlink path configured for communicatively coupling a transmit antenna of the distributed antenna system to a base station;
an uplink path configured for communicatively coupling a receive antenna of the distributed antenna system to the base station;
wherein the electronically configurable filter is configured for isolating the uplink path from downlink signals traversing the downlink path, wherein the electronically configurable filter is further configured for isolating the uplink path from downlink signals in a first frequency band in response to a first electronic control signal and is configured for isolating the uplink path from downlink signals in a second frequency band in response to a second electronic control signal.
2. The non-duplexer isolator sub-system of claim 1 , wherein the electronically configurable filter comprises a bandpass filter and is configurable with a first frequency response corresponding to the first frequency band and a second frequency response corresponding to the second frequency band.
3. The non-duplexer isolator sub-system of claim 1 , further comprising a processing device configured to modify a frequency response of the electronically configurable filter in response to an electronic control signal.
4. The non-duplexer isolator sub-system of claim 1 , wherein the electronically configurable filter has a frequency response that is electrically tunable in response to an electronic control signal.
5. The non-duplexer isolator sub-system of claim 4 , wherein the electronically configurable filter comprises at least one varactor diode, wherein the frequency response of the electronically configurable filter is electrically tunable in response to a voltage applied to the at least one varactor diode.
6. The non-duplexer isolator sub-system of claim 5 , wherein the at least one varactor diode has a capacitance that is tunable by the voltage and that corresponds to at least one of a bandwidth and a center frequency of the electronically configurable filter.
7. The non-duplexer isolator sub-system of claim 5 , further comprising a voltage source configured to provide the voltage and a processing device communicatively coupled to the voltage source, the processing device configured for selecting a voltage level of the voltage in response to receiving an electronic control signal.
8. The non-duplexer isolator sub-system of claim 1 , wherein the electronically configurable filter is disposed in a remote antenna unit of the distributed antenna system.
9. The non-duplexer isolator sub-system of claim 8 , wherein the electronically configurable filter is positioned in the downlink path between an up-conversion module of the remote antenna unit and the transmit antenna.
10. The non-duplexer isolator sub-system of claim 9 , wherein an input of the electronically configurable filter is communicatively coupled to a power amplifier of the remote antenna unit and an output of the electronically configurable filter is coupleable to the transmit antenna.
11. The non-duplexer isolator sub-system of claim 8 , wherein the electronically configurable filter is positioned in the uplink path between a down-conversion module of the remote antenna unit and the receive antenna.
12. The non-duplexer isolator sub-system of claim 11 , wherein an input of the electronically configurable filter is communicatively coupled to a low noise amplifier of the remote antenna unit and an output of the electronically configurable filter is communicatively coupled to the down-conversion module.
13. A method for configuring a non-duplexer isolator sub-system of a distributed antenna system, the method comprising:
providing the non-duplexer isolator sub-system in at least one of a downlink path of the distributed antenna system and an uplink path of the distributed antenna system;
providing a first electronic control signal to the non-duplexer isolator sub-system;
configuring, in response to the first electronic control signal, an electronically configurable filter of the non-duplexer isolator sub-system to isolate the uplink path from downlink signals in a first frequency band traversing the downlink path;
providing a second electronic control signal to the non-duplexer isolator sub-system; and
configuring, in response to the second electronic control signal, the electronically configurable filter to isolate the uplink path from downlink signals in a second frequency band traversing the downlink path.
14. The method of claim 13 , wherein the electronically configurable filter comprises a bandpass filter, wherein configuring the electronically configurable filter to isolate the uplink path from the downlink signals in the first frequency band comprises selecting a first frequency response for the bandpass filter, wherein configuring the electronically configurable filter to isolate the uplink path from the downlink signals in the second frequency band comprises selecting a second frequency response for the bandpass filter.
15. The method of claim 14 , wherein the bandpass filter comprises at least one electrically tunable component, wherein selecting the first frequency response for the bandpass filter comprises applying a first voltage tuning the at least one electrically tunable component to a first capacitance corresponding to the first frequency response, wherein selecting the second frequency response for the bandpass filter comprises applying a second voltage tuning the at least one electrically tunable component to a second capacitance corresponding to the second frequency response.
16. The method of claim 15 , wherein the at least one electrically tunable component comprises at least one varactor diode.
17. The method of claim 15 , wherein applying the first voltage comprises selecting a first voltage level for a voltage source in the non-duplexer isolator sub-system and wherein applying the second voltage comprises selecting a second voltage level for the voltage source.
18. The method of claim 17 , wherein the first and second voltage levels are selected by a processing device of the non-duplexer isolator sub-system in response to respectively receiving the first and second electronic control signals.
19. The method of claim 13 , further comprising communicatively coupling an external computing device to the distributed antenna system, wherein the first and second electronic control signals are provided from the external computing device.