Wideband interference mitigation for devices with multiple receivers
Certain disclosed embodiments pertain to suppressing interference in a wireless communication system. For example, a method of suppressing interference can include receiving one or more first signals including components from a plurality of sub-channels. Each of the first signals can be converted into a respective plurality of first sub-band frequency components. A respective spatial filter can be determined for each frequency sub-band using one or more corresponding first sub-band components for each respective spatial filter. One or more second signals including components from the plurality of sub-channels can be received. Each of the second signals can be converted into a respective plurality of second sub-band frequency components. A corresponding plurality of filtered sub-band components can be generated by applying the respective spatial filters to the corresponding second sub-band components for each of the second signals.
1. A method of suppressing wideband interference in a wireless communication system, the method comprising:
i.) receiving a first signal on a frequency band, wherein the first signal comprises components from a plurality of sub-channels;
ii.) converting the first signal into a respective plurality of first sub-band frequency components, wherein each sub-band is defined in the frequency domain;
iii.) determining a respective single-tap spatial filter for each frequency sub-band using one or more corresponding first sub-band components for each respective spatial filter;
iv.) receiving a second signal on said frequency band, wherein the second signal comprises components from the plurality of sub-channels;
v.) converting the second signal into a respective plurality of second sub-band frequency components; and
vi.) generating a corresponding plurality of filtered sub-band components by applying the respective single-tap spatial filters to the corresponding second sub-band components of the second signal,
wherein step iii) is performed before any of the steps iv)-vi); and
wherein step iii) is performed without determining that the first signal includes a substantial signal of interest.
2. The method of claim 1 , wherein step ii) is performed before any of the steps iii)-vi) and wherein step ii) is performed without determining that the first signal includes a substantial signal of interest.
3. The method of claim 1 , further comprising determining whether one of the first or second received signals includes the signal of interest.
4. The method of claim 3 , wherein determining whether one of the first or second received signals includes the signal of interest comprises detecting a packet.
5. The method of claim 1 , further comprising receiving an estimation stimulus, wherein step iii) is triggered at least partially based on the estimation stimulus.
6. The method of claim 5 , wherein the estimation stimulus is included in one of the first or second signals.
7. The method of claim 5 , wherein the estimation stimulus comprises a control signal.
8. The method of claim 5 , wherein the estimation stimulus comprises a determination that a packet was detected.
9. The method of claim 5 , wherein the estimation stimulus comprises a determination that packets are no longer being detected.
10. The method of claim 1 , wherein the bandwidth of the sub-band frequency components is less than the coherence bandwidth of the sub-channel.
11. The method of claim 1 , wherein step i) is performed without determining that the first signal includes a substantial signal of interest.
12. Non-transitory physical computer storage comprising computer-executable instructions that, when executed by a computing system, are configured to:
i.) receive a first signal on a frequency band, wherein the first signal comprises components from a plurality of sub-channels;
ii.) convert the first signal into a respective plurality of first sub-band frequency components, wherein each sub-band is defined in the frequency domain;
iii.) determine a respective single-tap spatial filter for each frequency sub-band using one or more corresponding first sub-band components for each respective spatial filter;
iv.) receive a second signal on said frequency band, wherein the second signal comprises components from the plurality of sub-channels;
v.) convert the second signal into a respective plurality of second sub-band frequency components; and
vi.) generate a corresponding plurality of filtered sub-band components by applying the respective single-tap spatial filters to the corresponding second sub-band components of the second signal,
wherein step iii) is performed before any of the steps iv)-vi); and
wherein step iii) is performed without determining that the first signal includes a substantial signal of interest.
13. Non-transitory physical computer storage of claim 12 , wherein step ii) is performed before any of the steps iii)-vi) and wherein step ii) is performed without determining that the first signal includes a substantial signal of interest.
14. Non-transitory physical computer storage of claim 12 , wherein the computer-executable instructions are further configured to determine whether one of the first or second received signals includes the signal of interest.
15. Non-transitory physical computer storage of claim 12 , further comprising machine executable instructions stored thereon to receive an estimation stimulus, wherein step iii) is triggered at least partially based on the estimation stimulus.
16. Non-transitory physical computer storage of claim 15 , wherein the estimation stimulus is included in one of the first or second signals.
17. Non-transitory physical computer storage of claim 15 , wherein the estimation stimulus comprises a determination that a packet was detected.
18. Non-transitory physical computer storage of claim 15 , wherein the estimation stimulus comprises a determination that packets are no longer being detected.
19. Non-transitory physical computer storage of claim 15 , wherein the bandwidth of the sub-band frequency components is less than the coherence bandwidth of the sub-channel.
20. Non-transitory physical computer storage of claim 12 , wherein step i) is performed without determining that the first signal includes a substantial signal of interest.
21. A system for suppressing wideband interference, the system comprising:
an antenna configured to receive wireless signals; and
a processing unit configured to:
i.) process a first signal on a frequency band received at the antenna, wherein the first signal comprises components from a plurality of sub-channels;
ii.) convert the first signal into a respective plurality of first sub-band frequency components, wherein each sub-band is defined in the frequency domain;
iii.) determine, with the assumption that the first signal does not include a substantial signal of interest, a respective single-tap spatial filter for each frequency sub-band using one or more corresponding first sub-band components for each respective spatial filter;
iv.) process a second signal on said frequency band received at the antenna, wherein the second signal comprises components from the plurality of sub-channels;
v.) convert the second signal into a respective plurality of second sub-band frequency components; and
vi.) generate a corresponding plurality of filtered sub-band components by applying the respective single-tap spatial filters to the corresponding second sub-band components of the second signal,
wherein step iii) is performed before any of the steps iv)-vi).
22. The system of claim 21 , wherein the processing unit is further configured to determine whether one of the first or second received signals includes the signal of interest.
23. The system of claim 21 , wherein step i) is performed without determining that the first signal includes a substantial signal of interest.