Interference cancellation in microwave backhaul systems

Patent metadata

Field	Value
Publication number	US-9923585-B2
Application number	US-201615297963-A
Country	US
Kind code	B2
Filing date	Oct 19, 2016
Priority date	Dec 30, 2013
Publication date	Mar 20, 2018
Grant date	Mar 20, 2018

Abstract

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.

First claim

What is claimed is:

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.

Assignees

• Maxlinear Inc

Inventors

• Laurent-Michel Stephane
• Ling Curtis

Classifications

• H04L25/03057

  with a recursive structure (H04L25/03031 takes precedence) · CPC title

• H04B1/123

  using adaptive balancing or compensation means (adaptive filter circuits and algorithms H03H) · CPC title

• H04B1/1081

  Reduction of multipath noise (by equalising H04B7/005) · CPC title

• H04B1/1027 Primary

  assessing signal quality or detecting noise/interference for the received signal · CPC title

• H01Q19/13

  the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination (H01Q19/15 takes precedence) · CPC title