Systems and methods for full-duplex signal shaping

1. A system for processing signals, comprising:

a transmitter that transmits an RF transmit signal;

a receiver that receives an RF receive signal; wherein transmission of the RF transmit signal and reception of the RF receive signal occur simultaneously;

an interference cancellation component that samples the RF transmit signal and transforms the sampled RF transmit signal into a self-interference cancellation signal; wherein the self-interference cancellation signal is combined with the RF receive signal to remove a first portion of interference from the RF receive signal, said combination forming a processed RF signal; and

a filtering component that removes a second portion of interference from the processed signal by:

downconverting the processed RF signal to a processed baseband signal,

sampling, at a first sample rate, the processed baseband signal at an analog-to-digital converter to create a processed digital signal, and

filtering the processed digital signal to remove the second portion of interference;

wherein removal of the first portion of interference results in prevention of receiver saturation at the filtering component.

2. The system of claim 1 , wherein the first portion of interference is larger than a dynamic range of the analog-to-digital converter.

3. The system of claim 1 , wherein the interference cancellation component is configured to remove at least a predetermined amount of power from the RF receive signal through combination of the RF receive signal with the self-interference cancellation signal.

4. The system of claim 3 , wherein the predetermined amount of power is set according to a dynamic range of the RF transmit signal.

5. The system of claim 3 , wherein the predetermined amount of power is set according to a dynamic range of the RF receive signal.

6. The system of claim 3 , wherein the predetermined amount of power is set according to a range of expected signal strength.

7. A method for processing signals, comprising:

transmitting an RF transmit signal;

receiving an RF receive signal; wherein transmission of the RF transmit signal and reception of the RF receive signal occur simultaneously;

sampling the RF transmit signal;

transforming the sampled RF transmit signal into a self-interference cancellation signal;

combining the self-interference cancellation signal with the RF receive signal to remove a first portion of interference from the RF receive signal, said combination forming a processed RF signal;

downconverting the processed RF signal to a processed baseband signal;

sampling, at a first sample rate, the processed baseband signal at an analog-to-digital converter to create a processed digital signal; and

filtering the processed digital signal to remove a second portion of interference;

further comprising resampling the processed digital signal from the first sample rate to a second sample rate; wherein the second sample rate is higher than the first sample rate.

8. The method of claim 7 , wherein downconverting the processed RF signal comprises downconverting the processed RF signal into a narrowband stream.

9. The method of claim 7 , wherein removal of the first portion of interference results in prevention of receiver saturation; wherein the first portion of interference is larger than a dynamic range of the analog-to-digital converter.

10. The method of claim 7 , wherein transforming the sampled RF transmit signal into a self-interference cancellation signal comprises transforming the sampled RF transmit signal such that, when combined with the RF receive signal, the self-interference cancellation signal enables removal of at least a predetermined amount of power from the RF receive signal.

11. The method of claim 10 , wherein the predetermined amount of power is set according to at least one of:

a dynamic range of the RF transmit signal;

a dynamic range of the RF receive signal; and

a range of expected signal strength.

12. The method of claim 7 , wherein resampling the processed digital signal comprises resampling the processed digital signal prior to filtering the processed digital signal.

13. The method of claim 12 , further comprising filtering the processed digital signal to remove aliasing resulting from resampling.

14. The method of claim 7 , further comprising performing mapping of a digital transmit signal, using a digital intermediate frequency converter, to a frequency fragment in a wireless frequency band for transmission; further comprising converting the mapped digital transmit signal into the RF transmit signal.

15. A system for processing signals, comprising:

a transmitter that transmits an RF transmit signal;

a receiver that receives an RF receive signal; wherein transmission of the RF transmit signal and reception of the RF receive signal occur simultaneously;

an interference cancellation component that samples the RF transmit signal and transforms the sampled RF transmit signal into a self-interference cancellation signal; wherein the self-interference cancellation signal is combined with the RF receive signal to remove a first portion of interference from the RF receive signal, said combination forming a processed RF signal; and

a filtering component that removes a second portion of interference from the processed signal by:

downconverting the processed RF signal to a processed baseband signal,

sampling, at a first sample rate, the processed baseband signal at an analog-to-digital converter to create a processed digital signal, and

filtering the processed digital signal to remove the second portion of interference;

wherein downconverting the processed RF signal comprises downconverting the processed RF signal into a narrowband stream.

16. A system for processing signals, comprising:

a transmitter that transmits an RF transmit signal;

a receiver that receives an RF receive signal; wherein transmission of the RF transmit signal and reception of the RF receive signal occur simultaneously;

an interference cancellation component that samples the RF transmit signal and transforms the sampled RF transmit signal into a self-interference cancellation signal; wherein the self-interference cancellation signal is combined with the RF receive signal to remove a first portion of interference from the RF receive signal, said combination forming a processed RF signal; and

a filtering component that removes a second portion of interference from the processed signal by:

downconverting the processed RF signal to a processed baseband signal,

sampling, at a first sample rate, the processed baseband signal at an analog-to-digital converter to create a processed digital signal, and

filtering the processed digital signal to remove the second portion of interference;

wherein the filtering component resamples the processed digital signal from the first sample rate to a second sample rate; wherein the second sample rate is higher than the first sample rate.

17. The system of claim 16 , wherein the filtering component resamples the processed digital signal prior to filtering the processed digital signal.

18. The system of claim 16 , wherein the filtering component further comprises an anti-aliasing filter that removes aliasing from the processed digital signal after resampling.

19. A system for processing signals, comprising:

a transmitter that transmits an RF transmit signal;

a receiver that receives an RF receive signal; wherein transmission of the RF transmit signal and reception of the RF receive signal occur simultaneously;

an interference cancellation component that samples the RF transmit signal and transforms the sampled RF transmit signal into a self-interference cancellation signal; wherein the self-interference cancellation signal is combined with the RF receive signal to remove a first portion of interference from the RF receive signal, said combination forming a processed RF signal; and

a filtering component that removes a second portion of interference from the processed signal by:

downconverting the processed RF signal to a processed baseband signal,

sampling, at a first sample rate, the processed baseband signal at an analog-to-digital converter to create a processed digital signal, and

filtering the processed digital signal to remove the second portion of interference;

wherein the filtering component resamples the processed digital signal from the first sample rate to a second sample rate; wherein the second sample rate is lower than the first sample rate.

20. The system of claim 19 , wherein the processed digital signal comprises a first digital signal stream and a second digital signal stream; wherein the filtering component resamples the first digital signal stream from the first sample rate to a second sample rate; wherein the filtering component filters the first digital signal stream after resampling and filters the second digital signal stream without resampling.

21. The system of claim 20 , wherein the filtering component resamples the filtered first digital signal stream from the second sample rate to the first sample rate.

22. A system for processing signals, comprising:

a transmitter that transmits an RF transmit signal;

a receiver that receives an RF receive signal; wherein transmission of the RF transmit signal and reception of the RF receive signal occur simultaneously;

an interference cancellation component that samples the RF transmit signal and transforms the sampled RF transmit signal into a self-interference cancellation signal; wherein the self-interference cancellation signal is combined with the RF receive signal to remove a first portion of interference from the RF receive signal, said combination forming a processed RF signal; and

a filtering component that removes a second portion of interference from the processed signal by:

downconverting the processed RF signal to a processed baseband signal,

sampling, at a first sample rate, the processed baseband signal at an analog-to-digital converter to create a processed digital signal, and

filtering the processed digital signal to remove the second portion of interference;

wherein the filtering component performs mapping of a digital transmit signal, using a digital intermediate frequency converter, to a frequency fragment in a wireless frequency band for transmission by the transmitter; wherein the transmitter converts the mapped digital transmit signal into the RF transmit signal.

23. A method for processing signals, comprising:

transmitting an RF transmit signal;

receiving an RF receive signal; wherein transmission of the RF transmit signal and reception of the RF receive signal occur simultaneously;

sampling the RF transmit signal;

transforming the sampled RF transmit signal into a self-interference cancellation signal;

combining the self-interference cancellation signal with the RF receive signal to remove a first portion of interference from the RF receive signal, said combination forming a processed RF signal;

downconverting the processed RF signal to a processed baseband signal;

sampling, at a first sample rate, the processed baseband signal at an analog-to-digital converter to create a processed digital signal; and

filtering the processed digital signal to remove a second portion of interference;

wherein downconverting the processed RF signal comprises downconverting the processed RF signal into a narrowband stream.

24. A method for processing signals, comprising:

transmitting an RF transmit signal;

receiving an RF receive signal; wherein transmission of the RF transmit signal and reception of the RF receive signal occur simultaneously;

sampling the RF transmit signal;

transforming the sampled RF transmit signal into a self-interference cancellation signal;

combining the self-interference cancellation signal with the RF receive signal to remove a first portion of interference from the RF receive signal, said combination forming a processed RF signal;

downconverting the processed RF signal to a processed baseband signal;

sampling, at a first sample rate, the processed baseband signal at an analog-to-digital converter to create a processed digital signal; and

filtering the processed digital signal to remove a second portion of interference;

wherein removal of the first portion of interference results in prevention of receiver saturation;

wherein the first portion of interference is larger than a dynamic range of the analog-to-digital converter.

25. A method for processing signals, comprising:

transmitting an RF transmit signal;

receiving an RF receive signal; wherein transmission of the RF transmit signal and reception of the RF receive signal occur simultaneously;

sampling the RF transmit signal;

transforming the sampled RF transmit signal into a self-interference cancellation signal;

combining the self-interference cancellation signal with the RF receive signal to remove a first portion of interference from the RF receive signal, said combination forming a processed RF signal;

downconverting the processed RF signal to a processed baseband signal;

sampling, at a first sample rate, the processed baseband signal at an analog-to-digital converter to create a processed digital signal; and

filtering the processed digital signal to remove a second portion of interference;

wherein the processed digital signal comprises a first digital signal stream and a second digital signal stream; further comprising resampling the first digital signal stream from the first sample rate to a second sample rate; wherein filtering the processed digital signal comprises filtering the first digital signal stream after resampling and filtering the second digital signal stream without resampling.

26. The method of claim 25 , further comprising resampling the filtered first digital signal stream from the second sample rate to the first sample rate.

27. A method for processing signals, comprising:

transmitting an RF transmit signal;

receiving an RF receive signal; wherein transmission of the RF transmit signal and reception of the RF receive signal occur simultaneously;

sampling the RF transmit signal;

transforming the sampled RF transmit signal into a self-interference cancellation signal;

combining the self-interference cancellation signal with the RF receive signal to remove a first portion of interference from the RF receive signal, said combination forming a processed RF signal;

downconverting the processed RF signal to a processed baseband signal;

sampling, at a first sample rate, the processed baseband signal at an analog-to-digital converter to create a processed digital signal; and

filtering the processed digital signal to remove a second portion of interference;

further comprising performing mapping of a digital transmit signal, using a digital intermediate frequency converter, to a frequency fragment in a wireless frequency band for transmission; further comprising converting the mapped digital transmit signal into the RF transmit signal.