Systems and methods for self-interference canceller tuning

• US 9,832,003 B2
• Filed: 05/30/2017
• Issued: 11/28/2017
• Est. Priority Date: 08/09/2013
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Kumu Networks, Inc.
• Inventors: Bharadia, Dinesh, Choi, Jung-Il, Jain, Mayank
• Primary Examiner(s): Bolourchi, Nader
• Application Number:
  US15/608,163
• Publication Number:
  US 20170264420A1
• Time in Patent Office: 182 Days
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/143 for modulated signals H04L5/1469 takes precedence
• CPC Class Codes: H04L 5/1438 Negotiation of transmission parameters prior to communication modified according to link quality H04L1/0001
• CPC Class Codes: H04L 5/1461 Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

A system for self-interference canceller tuning includes a transmit coupler that creates a sampled analog transmit signal; an analog self-interference canceller that transforms the sampled analog transmit signal to an analog self-interference cancellation signal according to a set of tuning parameters, the set of tuning parameters comprising complex weights for a set of taps of the analog self-interference canceller; a tuning circuit that calculates the set of tuning parameters, and applies the set of tuning parameters to the analog self-interference canceller based on component calibration data of the analog self-interference canceller; and a receive coupler that combines the analog self-interference cancellation signal with the analog receive signal to reduce self-interference in the analog receive signal.

Claims

1. A system for self-interference canceller tuning comprising:

a transmit coupler, communicatively coupled to an analog transmit signal of a wireless communication system, that samples the analog transmit signal to create a sampled analog transmit signal;

an analog self-interference canceller that transforms the sampled analog transmit signal to an analog self-interference cancellation signal according to a set of tuning parameters, the set of tuning parameters comprising complex weights for a set of taps of the analog self-interference canceller;

wherein each tap of the set of taps is associated with a filter;

a tuning circuit that generates a tuning calibration profile based on both component calibration data and system calibration data of the analog self-interference canceller, calculates the set of tuning parameters in response to detection of a tuning trigger, and applies the set of tuning parameters to the analog self-interference canceller based on the tuning calibration profile;

wherein the tuning trigger is detected in response to either time since last tune exceeding a time threshold or temperature change over a time interval exceeding a temperature change threshold;

wherein applying the set of tuning parameters comprises setting attenuator values for each tap of the set of taps; and

a receive coupler, communicatively coupled to an analog receive signal of the wireless communication system, that combines the analog self-interference cancellation signal with the analog receive signal to reduce self-interference in the analog receive signal.

2. The system of claim 1, wherein the tuning circuit generates a tuning calibration profile by:

generating a test signal;

characterizing a fully-attenuated response of the analog self-interference canceller to the test signal;

characterizing a set of single tap responses of the analog self-interference canceller to the test signal; and

combining the set of single tap responses.

3. The system of claim 1, wherein the tuning circuit sets delayer values for each tap of the set of taps when applying the set of tuning parameters.

4. The system of claim 1, wherein the tuning circuit translates the set of tuning parameters using component calibration data of the tuning calibration profile when applying the set of tuning parameters.

5. The system of claim 1, wherein the set of tuning parameters comprises tunable filter center frequencies.

6. A system for self-interference canceller tuning comprising:

a transmit coupler, communicatively coupled to an analog transmit signal of a wireless communication system, that samples the analog transmit signal to create a sampled analog transmit signal;

an analog self-interference canceller that transforms the sampled analog transmit signal to an analog self-interference cancellation signal according to a set of tuning parameters, the set of tuning parameters comprising complex weights for a set of taps of the analog self-interference canceller;

wherein each tap of the set of taps is associated with a filter of a set of basis filters;

wherein a majority of the set of basis filters are multi-peak filters;

a tuning circuit that generates a tuning calibration profile based on component calibration data of the analog self-interference canceller, calculates the set of tuning parameters in response to detection of a tuning trigger, and applies the set of tuning parameters to the analog self-interference canceller based on the tuning calibration profile;

wherein applying the set of tuning parameters comprises setting attenuator values for each tap of the set of taps; and

a receive coupler, communicatively coupled to an analog receive signal of the wireless communication system, that combines the analog self-interference cancellation signal with the analog receive signal to reduce self-interference in the analog receive signal.

7. The system of claim 6, wherein the tuning circuit sets delayer values for each tap of the set of taps when applying the set of tuning parameters.

8. The system of claim 6, wherein the tuning circuit calculates the set of tuning parameters in response to a change in parameters of a digital self-interference canceller.

9. The system of claim 6, wherein the tuning circuit ignores contribution of a self-interference component when calculating the set of tuning parameters.

10. The system of claim 6, wherein the tuning circuit calculates the set of tuning parameters iteratively in combination with a digital self-interference canceller tuning algorithm.

11. The system of claim 6, wherein the tuning circuit detects the tuning trigger by detecting boot-up of the analog self-interference canceller.

12. The system of claim 6, wherein the filters of the set of basis filters are substantially orthogonal.

13. A method for self-interference canceller tuning comprising:

generating a tuning calibration profile based on component calibration data of an analog self-interference canceller;

wherein the analog self-interference canceller generates a self-interference cancellation signal that is combined with a first receive signal to create a reduced-self-interference receive signal;

detecting a tuning trigger in response to a second receive signal exceeding a power threshold;

calculating a set of tuning parameters in response to the tuning trigger;

wherein the set of tuning parameters comprises complex weights for a set of taps of the analog self-interference canceller;

wherein each tap of the set of taps is associated with a filter; and

applying the set of tuning parameters based on the tuning calibration profile;

wherein applying the set of tuning parameters comprises setting attenuator values for each tap of the set of taps.

14. The method of claim 13, wherein the second receive signal is the first receive signal.

15. The method of claim 13, wherein the second receive signal is the reduced-self-interference receive signal.

16. The method of claim 15, wherein detecting the tuning trigger comprises detecting the tuning trigger in response to the second receive signal exceeding the power threshold for a time greater than a threshold time.

17. The method of claim 13, wherein generating a tuning calibration profile comprises:

generating a test signal;

characterizing a fully-attenuated response of the analog self-interference canceller to the test signal;

characterizing a set of single tap responses of the analog self-interference canceller to the test signal; and

combining the set of single tap responses.

18. The method of claim 13, wherein generating the tuning calibration profile comprises generating the tuning calibration profile in response to detection of the tuning trigger.

19. The method of claim 13, wherein applying the set of tuning parameters based on the tuning calibration profile comprises translating the set of tuning parameters using component calibration data of the tuning calibration profile.

20. The method of claim 19, wherein the set of tuning parameters comprises tunable filter center frequencies.