Interference cancellation in microwave backhaul systems
View Patent ↗A first microwave backhaul assembly comprises a first antenna, a front-end circuit, an inter-backhaul-assembly interface circuit, and an interference cancellation circuit. The first antenna is operable to receive a first microwave signal. The front-end circuit is operable to convert the first microwave signal to a lower-frequency digital signal, wherein the lower-frequency digital signal has energy of a second microwave signal and energy of a third microwave signal. The inter-backhaul-assembly interface circuit is operable to receive information from a second microwave backhaul assembly. The interference cancellation circuit is operable to use the information received via the inter-backhaul-assembly interface circuit during processing of the lower-frequency digital signal to remove, from the first microwave signal, the energy of the third microwave signal. The information received via the inter-backhaul-assembly interface may comprise a signal having energy of the second microwave signal.
1. A system comprising:
a first receiver operable to output a digital signal comprising a desired signal with interference;
an interface operable to receive information from a second receiver, wherein the information received via the interface comprises a signal having energy at the frequency of the desired signal; and
an interference cancellation circuit operable to use the information received via the interface to reduce the interference.
2. The system of claim 1 , wherein the information received via the interface comprises a signal having energy at the frequency of the interference.
3. The system of claim 1 , wherein the information received via the interface comprises an indication of an amount of energy of the interference received by the second receiver.
4. The system of claim 1 , wherein:
the desired signal is destined for the first receiver; and
the interference is related to a signal destined for the second receiver.
5. The system of claim 1 , wherein one or more radiation lobes of a first antenna, operably coupled to the first receiver, overlap with one or more radiation lobes of a second antenna, operably coupled to the second receiver.
6. The system of claim 5 , wherein the first antenna and the second antenna are mounted to the same support structure.
7. The system of claim 5 , wherein:
the first antenna comprises a first parabolic reflector;
the second antenna comprises a second parabolic reflector; and
the first parabolic reflector and the second parabolic reflector are mounted facing away from each other on a support structure.
8. The system of claim 1 , wherein the interface is operable to output the digital signal to a destination external to the first receiver.
9. The system of claim 1 , wherein:
the first receiver is operable to measure a performance metric for a received microwave signal; and
the interface is operable to output the measured performance metric to a destination external to the first receiver.
10. A method comprising:
receiving, via a first antenna of a first receiver, a first microwave signal;
converting, via the first receiver, the first microwave signal to a lower-frequency digital signal, wherein the lower-frequency digital signal comprises a desired signal and interference;
receiving, via an interface, information from a second receiver; and
processing, by an interference cancellation circuit using the information received via the interface, the lower-frequency digital signal to reduce the interference.
11. The method of claim 10 , wherein the information received via the interface comprises a signal having energy at the frequency of the desired signal.
12. The method of claim 10 , wherein the information received via the interface comprises a signal having energy at the frequency of the interference.
13. The method of claim 10 , wherein the information received via the interface comprises an indication of an amount of energy of the interference received by the second receiver.
14. The method of claim 10 , wherein:
the desired signal is destined for the first receiver; and
the interference is related to a signal destined for the second receiver.
15. The method of claim 10 , wherein one or more radiation lobes of a first antenna, operably coupled to the first receiver, overlap with one or more radiation lobes of a second antenna, operably coupled to the second receiver.
16. The method of claim 15 , wherein the first antenna and the second antenna are mounted to the same support structure.
17. The method of claim 15 , wherein:
the first antenna comprises a first parabolic reflector;
the second antenna comprises a second parabolic reflector; and
the first parabolic reflector and the second parabolic reflector are mounted facing away from each other on a support structure.
18. The method of claim 10 , comprising outputting, by the interface, the lower-frequency digital signal to a destination external to the first receiver.
19. The method of claim 1 , comprising:
measuring, by the first receiver, a performance metric for the first microwave signal; and
outputting, by the interface, the measured performance metric to a destination external to the first receiver.
20. A system comprising:
a first receiver operable to output a digital signal comprising a desired signal with interference;
an interface operable to receive information from a second receiver, wherein the information received via the interface comprises a signal having energy at the frequency of the interference; and
an interference cancellation circuit operable to use the information received via the interface to reduce the interference.
21. The system of claim 20 , wherein the information received via the interface comprises a signal having energy at the frequency of the desired signal.
22. The system of claim 20 , wherein the information received via the interface comprises an indication of an amount of energy of the interference received by the second receiver.
23. The system of claim 20 , wherein:
the desired signal is destined for the first receiver; and
the interference is related to a signal destined for the second receiver.
24. The system of claim 20 , wherein one or more radiation lobes of a first antenna, operably coupled to the first receiver, overlap with one or more radiation lobes of a second antenna, operably coupled to the second receiver.
25. The system of claim 24 , wherein the first antenna and the second antenna are mounted to the same support structure.
26. The system of claim 24 , wherein:
the first antenna comprises a first parabolic reflector;
the second antenna comprises a second parabolic reflector; and
the first parabolic reflector and the second parabolic reflector are mounted facing away from each other on a support structure.
27. The system of claim 20 , wherein the interface is operable to output the digital signal to a destination external to the first receiver.
28. The system of claim 20 , wherein:
the first receiver is operable to measure a performance metric for a received microwave signal; and
the interface is operable to output the measured performance metric to a destination external to the first receiver.