METHODS AND APPARATUS FOR MITIGATING KNOWN INTERFERENCE

• US 20170041030A1
• Filed: 10/21/2016
• Published: 02/09/2017
• Est. Priority Date: 11/08/2011
• Status: Active Grant

• Current Assignee: Marvell Asia Pte Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell World Trade Limited (Marvell Technology Group Limited)
• Inventors: Sun, Yakun, Lou, Hui-Ling
• Granted Patent: US 10,003,365 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 1/10 Means associated with receiver for limiting or suppressing noise or interference
• CPC Class Codes: H04J 11/0056 Inter-base station aspects
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26136 Pilot sequence conveying additional information
• CPC Class Codes: H04L 27/2647 Arrangements specific to the receiver only equalisation H04L27/01
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Systems and methods for mitigating known interference at a receiving device are provided. A signal from a transmission source is received by a receiving device that is affected by an interference source. At least one of a first pilot signal associated with the transmission source and a second pilot signal associated with the interfering source is determined. The first pilot signal includes information broadcast from the transmission source and the second pilot signal includes information broadcast from the interference source. Interference caused by the interference source is mitigated from the received signal using at least one of the first pilot signal and the second pilot signal.

Claims

1-20. -20. (canceled)

21. A method for mitigating interference in a receiving device, the method comprising:

receiving a signal from a transmission source that is affected by interference from an interference source;

determining a first channel estimate corresponding to the transmission source and a second channel estimate corresponding to the interference source;

determining, based on the first and the second channel estimates, an expected improvement in signal quality resulting from interference mitigation; and

mitigating the interference caused by the interference source if the expected improvement in signal quality exceeds a threshold, wherein mitigating the interference is based on the second channel estimate and assistance information.

22. The method of claim 21, wherein mitigating the interference comprises:

generating a representation of the interference from the interference source based on the assistance information.

23. The method of claim 21, wherein mitigating the interference comprises:

subtracting the interference from the received signal to cancel the interference.

24. The method of claim 21, wherein mitigating the interference comprises:

applying a coherent interference cancelation technique to the received signal to mitigate the interference from the interference source.

25. The method of claim 21, wherein the assistance information is received from at least one of the transmission source and the interference source.

26. The method of claim 21, wherein the second channel estimate is determined based on the assistance information.

27. The method of claim 21, wherein the assistance information comprises an identifier of the interference source.

28. The method of claim 21, wherein determining the expected improvement in signal quality comprises:

comparing a strength of the signal from the transmission source with a strength of the interference from the interference source.

29. The method of claim 21, wherein determining the expected improvement in signal quality is based on a measure of reliability of the second channel estimate.

30. The method of claim 21, wherein the interference from the interference source corresponds to at least one of a Cell-Specific Reference Signal (CRS), a synchronization signal, a Physical Downlink Control Channel (PDCCH), or a Physical Control Format Indicator Channel (PCFICH).

31. A system for mitigating interference, the system comprising:

a receiver configured to receive a signal from a transmission source that is affected by interference from an interference source;

channel estimation circuitry configured to determine a first channel estimate corresponding to the transmission source and a second channel estimate corresponding to the interference source;

control circuitry configured to determine, based on the first and the second channel estimates, an expected improvement in signal quality resulting from interference mitigation; and

interference mitigation circuitry configured to mitigate the interference caused by the interference source if the expected improvement in signal quality exceeds a threshold, wherein mitigating the interference is based on the second channel estimate and assistance information.

32. The system of claim 31, wherein the interference mitigation circuitry is further configured to:

generate a representation of the interference from the interference source based on the assistance information.

33. The system of claim 31, wherein the interference mitigation circuitry is further configured to:

subtract the interference from the received signal to cancel the interference.

34. The system of claim 31, wherein the interference mitigation circuitry is further configured to:

apply a coherent interference cancelation technique to the received signal to mitigate the interference from the interference source.

35. The system of claim 31, wherein the assistance information is received from at least one of the transmission source and the interference source.

36. The system of claim 31, wherein the channel estimation circuitry is further configured to:

determine the second channel estimate based on the assistance information.

37. The system of claim 31, wherein the assistance information comprises an identifier of the interference source.

38. The system of claim 31, wherein the control circuitry is further configured to:

compare a strength of the signal from the transmission source with a strength of the interference from the interference source.

39. The system of claim 31, wherein the control circuitry is further configured to:

determine the expected improvement in signal quality based on a measure of reliability of the second channel estimate.

40. The system of claim 31, wherein the interference from the interference source corresponds to at least one of a Cell-Specific Reference Signal (CRS), a synchronization signal, a Physical Downlink Control Channel (PDCCH), or a Physical Control Format Indicator Channel (PCFICH).