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1. (WO2011017036) SELF-INTERFERENCE CANCELLATION FOR MULTICHANNEL MODEMS
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CLAIMS

1. A method for detecting and reducing aliasing, the method being implemented by a first wireless device, the method comprising:

transmitting a first signal on a first frequency channel;

receiving a second signal on a second frequency channel, wherein the second signal is received concurrently with the transmission of the first signal; detecting aliasing of the first signal on the second signal; and

reducing the aliasing.

2. The method of claim 1 , wherein the first frequency channel is a very high throughput (VHT) channel that comprises one or more basic channels.

3. The method of claim 1 , wherein reducing aliasing comprises :

determining the estimated channel from a transmitter of the first frequency channel to a receiver of the second frequency channel; and

cancelling the interference created by the transmitter of the first frequency channel in the receiver of the second frequency channel.

4. The method of claim 3, wherein determining the estimated channel comprises: sending a first clear-to-send (CTS) on the first channel;

sending a second CTS on the second channel;

sending a short packet on the first channel;

receiving the short packet on the second channel; and

processing the received short packet and transmitted short packet.

5. The method of claim 4, wherein processing the received short packet and the transmitted short packet comprises taking the ratio of the frequency domain response of the received short packet and a frequency shifted version of the transmitted short packet.

6. The method of claim 3, wherein cancelling the interference comprises determining an estimated aliased signal by convolving the frequency shifted transmitted packet with the estimated channel, and further comprising subtracting the estimated aliased signal from the received second signal.

7. The method of claim 4, wherein the short packet comprises training symbols.

8. The method of claim 7, wherein the training symbols are Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard Long Training Fields (LTFs).

9. The method of claim 1 , wherein the first signal is transmitted on a first VHT channel first basic channel, and wherein the second signal is received on a second VHT channel first basic channel.

10. The method of claim 9, wherein reducing aliasing comprises:

instructing a second wireless device configured to receive the first signal on the first VHT channel first basic channel to receive the first signal on a first VHT channel second basic channel; and

transmitting the first signal on the first VHT channel second basic channel to the second wireless device.

11. The method of claim 9, wherein reducing aliasing comprises:

instructing a second wireless device configured to transmit the second signal on the second VHT channel first basic channel to transmit the second signal on a second VHT channel second basic channel; and

receiving the second signal on the second VHT channel second basic channel from the second wireless device.

12. The method of claim 1, wherein reducing aliasing comprises adjusting the sampling rate for an analog-to-digital converter (ADC).

13. The method of claim 1, wherein the aliasing is caused by analog-to-digital convertor (ADC) sampling.

14. A wireless device that is configured for detecting and reducing aliasing, comprising:

a processor; and

circuitry coupled to said processor configured to:

transmit a first signal on a first frequency channel;

receive a second signal on a second frequency channel, wherein the second signal is received concurrently with the transmission of the first signal;

detect aliasing of the first signal on the second signal; and reduce the aliasing.

15. The wireless device of claim 14, wherein the first frequency channel is a very high throughput (VHT) channel that comprises one or more basic channels.

16. The wireless device of claim 14, wherein reducing the aliasing comprises: determining the estimated channel from a transmitter of the first frequency channel to a receiver of the second frequency channel; and

cancelling the interference created by the transmitter of the first frequency channel in the receiver of the second frequency channel.

17. The wireless device of claim 16, wherein the circuitry is further configured to: send a first clear-to-send (CTS) on the first channel;

send a second CTS on the second channel;

send a short packet on the first channel;

receive the short packet on the second channel; and

process the received short packet and transmitted short packet.

18. The wireless device of claim 17, wherein processing the received short packet and the transmitted short packet comprises taking the ratio of the frequency domain response of the received short packet and a frequency shifted version of the transmitted short packet.

19. The wireless device of claim 16, wherein cancelling the interference comprises determining an estimated aliased signal by convolving the frequency shifted transmitted packet with the estimated channel, and wherein the circuitry is further configured to subtract the estimated aliased signal from the received second signal.

20. The wireless device of claim 17, wherein the short packet comprises training symbols.

21. The wireless device of claim 20, wherein the training symbols are Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard Long Training Fields (LTFs).

22. The wireless device of claim 14, wherein the first signal is transmitted on a first VHT channel first basic channel, and wherein the second signal is received on a second VHT channel first basic channel.

23. The wireless device of claim 22, wherein reducing the aliasing comprises:

instructing a second wireless device configured to receive the first signal on the first VHT channel first basic channel to receive the first signal on a first VHT channel second basic channel; and

transmitting the first signal on the first VHT channel second basic channel to the second wireless device.

24. The wireless device of claim 23, wherein reducing the aliasing comprises:

instructing a second wireless device configured to transmit the second signal on the second VHT channel first basic channel to transmit the second signal on a second VHT channel second basic channel; and

receiving the second signal on the second VHT channel second basic channel from the second wireless device.

25. The wireless device of claim 14, wherein reducing the aliasing comprises adjusting the sampling rate for an analog-to-digital converter (ADC).

26. The wireless device of claim 14, wherein the aliasing is caused by analog-to-digital converter (ADC) sampling.

27. The wireless device of claim 14, wherein the wireless device is an access point.

28. The wireless device of claim 14, wherein the wireless device is a subscriber station.

29. An apparatus that is configured for detecting and reducing aliasing, comprising: means for transmitting a first signal on a first frequency channel;

means for receiving a second signal on a second frequency channel, wherein the second signal is received concurrently with the transmission of the first signal;

means for detecting aliasing of the first signal on the second signal; and means for reducing aliasing.

30. A computer-program product for detecting and reducing aliasing, the computer-program product comprising a computer-readable medium having instructions thereon, the instructions comprising:

code for transmitting a first signal on a first frequency channel;

code for receiving a second signal on a second frequency channel, wherein the second signal is received concurrently with the transmission of the first signal;

code for detecting aliasing of the first signal on the second signal; and code for reducing aliasing.