Systems and methods for tunable out-of-band interference mitigation

1. A system for interference mitigation, the system associated with a first signal and a second signal, the system comprising:

a receive bandpass filter configured to suppress signals outside a receive band;

a transmit bandpass filter configured to suppress signals outside a transmit band;

a transmit band interference cancellation system (TxICS) communicatively coupled between the receive bandpass filter and the transmit bandpass filter;

a receive band interference cancellation system (RxICS) communicatively coupled between the receive bandpass filter and the transmit bandpass filter in parallel with the TxICS;

a duplexer communicatively coupled to an antenna of a communication system;

a first signal coupler communicatively coupled between the duplexer, the receive bandpass filter, and a transmitter of the communication system, wherein:

the duplexer is communicatively coupled between the first signal coupler and the antenna;

the receive bandpass filter is communicatively coupled between the first signal coupler and the TxICS; and

the receive bandpass filter is communicatively coupled between the first signal coupler and the RxICS; and

a second signal coupler communicatively coupled between the duplexer, the transmit bandpass filter, and a receiver of the communication system, wherein:

the duplexer is communicatively coupled between the second signal coupler and the antenna;

the transmit bandpass filter is communicatively coupled between the second signal coupler and the TxICS; and

the transmit bandpass filter is communicatively coupled between the second signal coupler and the RxICS.

2. The system of claim 1 , wherein the TxICS is configured to:

generate TxICS signal samples by sampling the first signal;

generate a TxICS interference cancellation signal by transforming the TxICS signal samples into a TxICS representation of self-interference present in the second signal; and

subtract the TxICS interference cancellation signal from the second signal.

3. The system of claim 2 , wherein:

the first signal is a transmit signal of the transmitter; and

the second signal is a receive signal of the receiver.

4. The system of claim 3 , wherein the TxICS representation of self-interference present in the receive signal comprises a representation of the transmit signal, in the transmit band, as received by a receiver.

5. The system of claim 4 , wherein the TxICS is further configured to:

generate a second interference cancellation signal by modelling a representation of the transmit signal, in the transmit band, as generated by a transmitter; and

subtract the second interference cancellation signal from the signal samples.

6. The system of claim 3 , wherein the TxICS is further configured to:

generate a second interference cancellation signal by modelling a representation of the transmit signal, in the transmit band, as generated by a transmitter; and

subtract the second interference cancellation signal from the signal samples.

7. The system of claim 6 , wherein the TxICS comprises a digital transmit band interference canceller (TxDC) comprising:

a TxDC component generator configured to generate a set of signal components from the TxICS signal samples;

a TxDC multi-rate adaptive filter configured to generate an interference cancellation TxDC component by combining a weighted sum of the signal components of the set of signal components, wherein the TxICS interference cancellation signal comprises the interference cancellation TxDC component; and

a TxDC transform adaptor configured to set a TxDC transform configuration of at least one of: the component generator or the multi-rate adaptive filter.

8. The system of claim 2 , wherein the TxICS comprises a digital transmit band interference canceller (TxDC) comprising:

a TxDC component generator configured to generate a set of signal components from the TxICS signal samples;

a TxDC multi-rate adaptive filter configured to generate an interference cancellation TxDC component by combining a weighted sum of the signal components of the set of signal components, wherein the TxICS interference cancellation signal comprises the interference cancellation TxDC component; and

a TxDC transform adaptor configured to set a TxDC transform configuration of at least one of: the component generator or the multi-rate adaptive filter.

9. The system of claim 8 , wherein:

the TxDC multi-rate adaptive filter is configured to combine the weighted sum according to a mathematical model selected from the group consisting of: a generalized memory polynomial model, a Volterra model, and a Wiener-Hammerstein model; and

the TxDC transform adaptor is configured to set the TxDC transform configuration of the multi-rate adaptive filter based on the mathematical model.

10. The system of claim 8 , wherein the TxDC transform adaptor is configured to set the TxDC transform configuration based on a residue signal sampled downstream of subtracting the TxICS interference cancellation signal from the second signal.

11. The system of claim 8 , wherein the TxICS further comprises an analog transmit band interference canceller configured to transform the first signal into an interference cancellation TxAC component by combining a set of modified versions of the first signal, wherein:

each modified version of the set of modified versions of the first signal is modified from the first signal by at least one of: filtering, scaling, or delaying; and

the TxICS interference cancellation signal comprises the interference cancellation TxC component.

12. The system of claim 2 , wherein the TxICS comprises an analog transmit band interference canceller configured to transform the first signal into an interference cancellation TxAC component by combining a set of modified versions of the first signal, wherein:

each modified version of the set of modified versions of the first signal is modified from the first signal by at least one of: filtering, scaling, or delaying; and

the TxICS interference cancellation signal comprises the interference cancellation TxC component.

13. The system of claim 2 , wherein the RxICS is configured to:

generate RxICS signal samples by sampling the first signal;

generate a RxICS interference cancellation signal by transforming the RxICS signal samples into a RxICS representation of self-interference present in the second signal; and

subtract the RxICS interference cancellation signal from the second signal.

14. The system of claim 1 , wherein the RxICS is configured to:

generate RxICS signal samples by sampling the first signal;

generate a RxICS interference cancellation signal by transforming the RxICS signal samples into a RxICS representation of self-interference present in the second signal; and

subtract the RxICS interference cancellation signal from the second signal.

15. The system of claim 14 , wherein the RxICS representation of self-interference present in the receive signal comprises a representation of the transmit signal, in the receive band, as received by a receiver.

16. The system of claim 14 , wherein the RxICS comprises a digital receive band interference canceller (RxDC) comprising:

a RxDC component generator configured to generate a set of signal components from the RxICS signal samples;

a RxDC multi-rate adaptive filter configured to generate an interference cancellation RxDC component by combining a weighted sum of the signal components of the set of signal components, wherein the RxICS interference cancellation signal comprises the interference cancellation RxDC component; and

a RxDC transform adaptor configured to set a RxDC transform configuration of at least one of: the RxDC component generator or the RxDC multi-rate adaptive filter.

17. The system of claim 1 , wherein the second signal coupler comprises a match circuit.

18. The system of claim 17 , wherein the match circuit is configured to perform impedance matching between the receiver and at least one of the TxICS or the RxICS.

19. The system of claim 17 , wherein the match circuit is configured to perform delay matching between the receiver and at least one of the TxICS or the RxICS.

20. The system of claim 19 , wherein the match circuit is further configured to perform impedance matching between the receiver and at least one of the TxICS or the RxICS.