Wideband interference mitigation for devices with multiple receivers

1. A method of suppressing wideband interference in a wireless communication system, the method comprising:

receiving one or more first signals on a frequency band, wherein each of the first signals comprises components from a plurality of sub-channels, and wherein each of the first signals comprises noise and/or interference without a substantial signal-of-interest;

converting each of the first signals into a respective plurality of first sub-band frequency components, wherein each sub-band is defined in the frequency domain;

determining a respective single-tap spatial filter for each frequency sub-band using one or more corresponding first sub-band components for each respective single-tap spatial filter without analyzing a signal-of-interest;

receiving one or more second signals on said frequency band, wherein each of the second signals comprises components from the plurality of sub-channels;

converting each of the second signals into a respective plurality of second sub-band frequency components; and

generating a corresponding plurality of filtered sub-band components by applying the respective single-tap spatial filters to the corresponding second sub-band components for each of the second signals wherein determining each respective single-tap spatial filter comprises: estimating a covariance matrix; weighting an identity matrix; generating a diagonally loaded covariance matrix by adding the weighted identity matrix to the estimated covariance matrix; and determining the inverse of the diagonally loaded covariance matrix.

2. The method of claim 1 , wherein one or more first signals comprises at least two first signals, wherein the first signals are received from a corresponding plurality of receiver antennas, and each of the first signals comprises components from corresponding sub-channels between the plurality of receiver antennas and a plurality of transmitter antennas.

3. The method of claim 1 , wherein one or more first signals comprises a single first signal, wherein the first signal is received from a corresponding single receiver antenna, and the first signal comprises components from corresponding sub-channels between the single receiver antenna and a plurality of transmitter antennas.

4. The method of claim 1 , wherein one or more first signals comprises at least two first signals, wherein the first signals are received from a corresponding plurality of receiver antennas, and each of the first signals comprises components from corresponding sub-channels between the plurality of receiver antennas and a single transmitter antenna.

5. The method of claim 1 , wherein the sub-band components are defined such that each sub-band can be approximated as non-frequency selective.

6. The method of claim 1 , wherein the one or more second signals are each assumed or known to comprise a signal-of-interest component.

7. The method of claim 1 , wherein the at least one second signal is received after the at least one first signal.

8. The method of claim 1 , wherein converting a signal into a respective plurality of sub-band frequency components comprises using a Discrete Fourier Transform (DFT).

9. The method of claim 1 , wherein converting a signal into a respective plurality of sub-band frequency components includes using multiple Discrete Fourier Transforms (DFTs).

10. The method of claim 9 , wherein the multiple DFTs are overlapping.

11. The method of claim 1 , wherein determining each respective single-tap spatial filter comprises eigenvector nulling.

12. The method of claim 1 , wherein determining each respective single-tap spatial filter comprises:

estimating a covariance matrix; and

determining the square root of the inverse of the estimated covariance matrix.

13. The method of claim 1 , further comprising filtering the first signals using an analysis window prior to converting the first signals into the corresponding plurality of sub-band components.

14. Non-transitory physical computer storage comprising computer-executable instructions that, when executed by a computing system, are configured to:

receive one or more first signals on a frequency band, wherein each of the first signals comprises components from a plurality of sub-channels, and wherein each of the first signals comprises noise and/or interference without a substantial signal-of-interest;

convert each of the first signals into a respective plurality of first sub-band frequency components, wherein each sub-band is defined in the frequency domain;

determine a respective single-tap spatial filter for each frequency sub-band using one or more corresponding first sub-band components for each respective single-tap spatial filter without analyzing a signal-of-interest;

receive one or more second signals on said frequency band, wherein each of the second signals comprises components from the plurality of sub-channels;

convert each of the second signals into a respective plurality of second sub-band frequency components; and

generate a corresponding plurality of filtered sub-band components by applying the respective single-tap spatial filters to the corresponding second sub-band components for each of the second signals wherein determining each respective single-tap spatial filter comprises: estimating a covariance matrix; weighting an identity matrix; generating a diagonally loaded covariance matrix by adding the weighted identity matrix to the estimated covariance matrix; and determining the inverse of the diagonally loaded covariance matrix.

15. A device configured to suppress wideband interference in a wireless communication system, the device comprising:

at least one input configured to receive at least one signal on a frequency band, wherein each signal comprises components from a plurality of sub-channels, and wherein each of the first signals comprises noise and/or interference without a substantial signal-of-interest;

at least one filter configured to convert said at least one signal from the time domain into a corresponding plurality of sub-band frequency components, wherein each sub-band is defined in the frequency domain;

a controller configured to execute code; and

non-transitory computer readable memory storing code that when executed by the controller is configured to:

determine a respective single-tap spatial filter for each frequency sub-band using one or more first sub-band components for each respective single-tap spatial filter without analyzing a known signal-of-interest, wherein the one or more first sub-band components are produced by the at least one filter from a corresponding one or more first signals received at the at least one input; and

apply the respective single-tap spatial filter to one or more second sub-band components to produced filtered sub-band components, wherein the one or more second sub-band components are produced by the at least one filter from a corresponding one or more second signals received at the at least one input wherein determining each respective single-tap spatial filter comprises: estimating a covariance matrix; weighting an identity matrix; generating a diagonally loaded covariance matrix by adding the weighted identity matrix to the estimated covariance matrix; and determining the inverse of the diagonally loaded covariance matrix.

16. A method of suppressing wideband interference in a wireless communication system, the method comprising:

receiving a first signal on a frequency band, wherein the first signal comprises components from a plurality of sub-channels, and wherein the first signal comprises noise and/or interference without a substantial signal-of-interest;

converting the first signal into a respective plurality of first sub-band frequency components, wherein each sub-band is defined in the frequency domain;

determining a respective single-tap spatial filter for each frequency sub-band using corresponding first sub-band components for each respective single-tap spatial filter without analyzing a known signal-of-interest;

receiving a second signal on said frequency band, wherein the second signal comprises components from the plurality of sub-channels;

converting the second signal into a respective plurality of second sub-band frequency components; and

generating a corresponding plurality of filtered sub-band components by applying the respective single-tap spatial filters to the corresponding second sub-band components wherein determining respective single-tap spatial filter comprises: estimating a covariance matrix; weighting an identity matrix; generating a diagonally loaded covariance matrix by adding the weighted identity matrix to the estimated covariance matrix; and determining the inverse of the diagonally loaded covariance matrix.