Interference suppression or cancellation in collocated receivers

• US 10,219,162 B1
• Filed: 02/23/2017
• Issued: 02/26/2019
• Est. Priority Date: 12/19/2013
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Inventors: Sun, Yakun, Xu, Mingguang, Lou, Hui-Ling, Zhang, Hongyuan, Zhang, Yan, Chu, Liwen, Jiang, Jinjing
• Primary Examiner(s): Talukder, Md K
• Application Number:
  US15/440,838
• Time in Patent Office: 733 Days
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04B 1/50 using different frequencies for the two directions of communication
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/1215 for collaboration of different radio technologies

Abstract

A wireless device includes a first receiver configured to receive a first signal transmitted using a first communication protocol, and to generate at least one of first information based on a first portion of a first signal and second information based on a second portion of the first signal. The wireless device includes a second receiver configured to receive a second signal transmitted using a second communication protocol, to suppress at least a portion of interference from the first signal based on the first information in response to the first receiver generating only the first information, and to cancel interference from the first signal based on the first information and the second information in response to the first receiver generating the first information and the second information.

Claims

1. A wireless device comprising:

a first receiver configured to

receive a first signal transmitted using a first communication protocol, and

generate at least one of or both of

(i) first information based on a first portion of the first signal, and

(ii) second information based on a second portion of the first signal; and

a second receiver configured to

receive a second signal transmitted using a second communication protocol,

suppress at least a portion of interference from the first signal based on the first information in response to the first receiver generating only the first information, and

cancel interference from the first signal based on the first information and the second information in response to the first receiver generating the first information and the second information;

wherein the first receiver is configured to decode the first signal, re-encode the first signal, and feedback the re-encoded first signal to the second receiver; and

the second receiver is configured to cancel interference by subtracting the re-encoded first signal from a portion of the second signal that is interfered by the first signal.

2. The wireless device of claim 1, wherein the first receiver and the second receiver are co-located in the wireless device.

3. The wireless device of claim 1, wherein the first receiver and the second receiver are configured to communicate in an unlicensed frequency band.

4. The wireless device of claim 1, wherein the first receiver is configured to generate the at least one of first information and the second information in response to a signal strength of the first signal being greater than or equal to a predetermined threshold.

5. The wireless device of claim 1, wherein the first receiver includes a portion of a physical layer and a portion of a medium access control layer and is configured to process (i) the first portion of the first signal and (ii) the second portion of the first signal.

6. The wireless device of claim 1, wherein:

the first communication protocol includes a WiFi protocol; and

the second communication protocol includes a cellular protocol.

7. The wireless device of claim 6, wherein:

the first receiver is configured to process a preamble of the first signal including (i) the first portion of the first signal and (ii) the second portion of the first signal.

8. The wireless device of claim 7, wherein:

the first portion of the first signal includes a short training field and a long training field of the preamble of the first signal; and

the second portion of the first signal includes a signal field of the preamble of the first signal.

9. The wireless device of claim 7, wherein:

the first receiver is configured to generate second information about the first signal based on the second portion of the first signal; and

the second receiver is configured to cancel interference from the first signal based on the second information about the first signal.

10. The wireless device of claim 9, wherein the second receiver is configured to dynamically switch between suppressing interference and cancelling interference depending on whether the first information or the second information is available.

11. The wireless device of claim 9, wherein the second receiver is configured to:

detect, based on one or more of (i) the first information and (ii) the second information, the portion of the second signal that is interfered by the first signal; and

suppress interference from the portion of the second signal using (i) a whitening filter or (ii) a rejection filter.

12. The wireless device of claim 9, wherein the second receiver is configured to:

detect, based on one or more of (i) the first information and (ii) the second information, the portion of the second signal that is interfered by the first signal; and

cancel interference from the portion of the second signal using feedback from the first receiver.

13. The wireless device of claim 6, wherein the second receiver comprises a time-domain whitening filter configured to suppress interference from the first signal across a plurality of receive antennas.

14. The wireless device of claim 6, wherein the second receiver comprises a correlator configured to suppress interference by correlating interference from the first signal across a plurality of receive antennas and tones.

15. The wireless device of claim 6, wherein the second receiver comprises a frequency-domain whitening filter configured to suppress interference from the first signal using tone-by-tone whitening and by disregarding cross-tone interference.

16. The wireless device of claim 6, wherein the second receiver comprises a frequency-domain whitening filter configured to suppress interference from the first signal using multiple-tone whitening, wherein a number of tones whitened together is predetermined or adaptively selected.

17. A wireless device comprising:

a first receiver configured to

receive a first signal transmitted using a first communication protocol, and

generate at least one of or both of

(i) first information based on a first portion of the first signal, and

(ii) second information based on a second portion of the first signal; and

a second receiver configured to

receive a second signal transmitted using a second communication protocol,

suppress at least a portion of interference from the first signal based on the first information in response to the first receiver generating only the first information, and

cancel interference from the first signal based on the first information and the second information in response to the first receiver generating the first information and the second information;

wherein the first receiver is configured to decode the first signal, generate soft information, generate an estimate of each symbol transmitted in the first signal, and feedback the estimate to the second receiver; and

wherein the second receiver is configured to cancel interference by subtracting the estimate from a portion of the second signal that is interfered by the first signal.

18. The wireless device of claim 17, wherein:

the first receiver and the second receiver are co-located in the wireless device;

the first receiver and the second receiver are configured to communicate in an unlicensed frequency band;

the first receiver is configured to generate the at least one of first information and the second information in response to a signal strength of the first signal being greater than or equal to a predetermined threshold; and

the first receiver includes a portion of a physical layer and a portion of a medium access control layer and is configured to process (i) the first portion of the first signal and (ii) the second portion of the first signal.

19. The wireless device of claim 17, wherein:

the first communication protocol includes a WiFi protocol; and

the second communication protocol includes a cellular protocol.

20. The wireless device of claim 19, wherein the second receiver comprises a time-domain whitening filter configured to suppress interference from the first signal across a plurality of receive antennas.

21. The wireless device of claim 19, wherein the second receiver comprises a correlator configured to suppress interference by correlating interference from the first signal across a plurality of receive antennas and tones.

22. The wireless device of claim 19, wherein the second receiver comprises a frequency-domain whitening filter configured to suppress interference from the first signal using tone-by-tone whitening and by disregarding cross-tone interference.

23. The wireless device of claim 19, wherein the second receiver comprises a frequency-domain whitening filter configured to suppress interference from the first signal using multiple-tone whitening, wherein a number of tones whitened together is predetermined or adaptively selected.

24. The wireless device of claim 19, wherein:

the first receiver is configured to process a preamble of the first signal including (i) the first portion of the first signal and (ii) the second portion of the first signal.

25. The wireless device of claim 24, wherein:

the first portion of the first signal includes a short training field and a long training field of the preamble of the first signal; and

the second portion of the first signal includes a signal field of the preamble of the first signal.

26. The wireless device of claim 24, wherein:

the first receiver is configured to generate second information about the first signal based on the second portion of the first signal; and

the second receiver is configured to cancel interference from the first signal based on the second information about the first signal.

27. The wireless device of claim 26, wherein the second receiver is configured to dynamically switch between suppressing interference and cancelling interference depending on whether the first information or the second information is available.

28. The wireless device of claim 26, wherein the second receiver is configured to:

detect, based on one or more of (i) the first information and (ii) the second information, the portion of the second signal that is interfered by the first signal; and

suppress interference from the portion of the second signal using (i) a whitening filter or (ii) a rejection filter.

29. The wireless device of claim 26, wherein the second receiver is configured to:

detect, based on one or more of (i) the first information and (ii) the second information, the portion of the second signal that is interfered by the first signal; and

cancel interference from the portion of the second signal using feedback from the first receiver.