INTERFERENCE REDUCTION BETWEEN OFDM CARRIERS BY FREQUENCY OFFSET OPTIMIZATION

• US 20090304100A1
• Filed: 06/05/2009
• Published: 12/10/2009
• Est. Priority Date: 06/09/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Banister, Brian C., Gaal, Peter, Brehler, Matthias
• Granted Patent: US 8,494,065 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04L 27/2657 Carrier synchronisation
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation

Abstract

Systems and methodologies are described that facilitate signal separation across different carriers within a wireless communications environment. The systems and methods can identify a carrier spacing that can be based upon a tone spacing associated with two or more carriers. Such carrier spacing can be employed within a network in order to mitigate signal separation with multiple carriers. The subject innovation can further evaluate a carrier raster associated with a network in order to identify a carrier spacing to ensure orthogonality between tones from different carriers.

Claims

1. A method that facilitates separating signals within a wireless communications environment, comprising:

verifying an Orthogonal Frequency-Division Multiplexing (OFDM) symbol duration between two or more carriers associated with an OFDM network, wherein verifying ensures a matching between the OFDM symbol duration between two or more carriers;

employing a time synchronization to ensure signal receipt from the two or more carriers have a minimal time offset;

receiving a tone spacing from the two or more carriers; and

implementing a carrier spacing for the two or more carriers, wherein the carrier spacing is an integer multiple of the tone spacing.

2. The method of claim 1, further comprising receiving the implemented carrier spacing with at least one of a base station, a serving base station, a target base station, a network, a server, a mobile device, a user equipment, an OFDM network, or an eNode B.

3. The method of claim 1, further comprising transmitting the implemented carrier spacing from at least one of a base station, a serving base station, a target base station, a network, a server, a mobile device, a user equipment, an OFDM network, or an eNode B.

4. The method of claim 1, wherein the OFDM network is at least one of a wireless network, a WiLAN, a WiFi, a router-based network, or a peer-to-peer network.

5. The method of claim 1, further comprising evaluating a network to identify a carrier raster, wherein the carrier raster is related to a network and includes a tolerance.

6. The method of claim 5, further comprising calculating the carrier spacing based upon identifying a least common multiple between the carrier raster and the tone spacing, wherein the common multiple takes in account the tolerance for flexibility.

7. The method of claim 1, further comprising employing the carrier spacing within network in order to separate signals from two or more carriers.

8. The method of claim 1, further comprising utilizing the carrier spacing with at least one of a base station or a user equipment (UE) in order to separate signals from two or more carriers.

9. The method of claim 1, wherein the time synchronization is a satellite navigation system technique.

10. The method of claim 1, further comprising verifying OFDM symbol duration is substantially similar by evaluating whether compatibility exists between two or more deployed systems on adjacent carriers.

11. A wireless communications apparatus, comprising:

at least one processor configured to;

verify an Orthogonal Frequency-Division Multiplexing (OFDM) symbol duration between two or more carriers;

employ a time synchronization to ensure signal receipt from the two or more carriers have a minimal time offset;

receive a tone spacing from the two or more carriers; and

implement a carrier spacing for the two or more carriers, wherein the carrier spacing is an integer multiple of the tone spacing; and

a memory coupled to the at least one processor.

12. The wireless communications apparatus of claim 11, further comprising at least one processor configured to receive the implemented carrier spacing with at least one of a base station, a serving base station, a target base station, a network, a server, a mobile device, a user equipment, an OFDM network, or an eNode B.

13. The wireless communications apparatus of claim 11, further comprising at least one processor configured to transmit the implemented carrier spacing from at least one of a base station, a serving base station, a target base station, a network, a server, a mobile device, a user equipment, an OFDM network, or an eNode B.

14. The wireless communications apparatus of claim 11, wherein the OFDM network is at least one of a wireless network, a WiLAN, a WiFi, a router-based network, or a peer-to-peer network.

15. The wireless communications apparatus of claim 11, further comprising at least one processor configured to evaluate a network to identify a carrier raster, wherein the carrier raster is related to a network and includes a tolerance.

16. The wireless communications apparatus of claim 15, further comprising at least one processor configured to calculate the carrier spacing based upon identifying a least common multiple between the carrier raster and the tone spacing, wherein the common multiple takes in account the tolerance for flexibility.

17. The wireless communications apparatus of claim 11, further comprising at least one processor configured to employ the carrier spacing within network in order to separate signals from two or more carriers.

18. The wireless communications apparatus of claim 11, further comprising at least one processor configured to utilize the carrier spacing with at least one of a base station or a user equipment (UE) in order to separate signals from two or more carriers.

19. The wireless communications apparatus of claim 11, wherein the time synchronization is a satellite navigation system technique.

20. The wireless communications apparatus of claim 11, further comprising at least one processor configured to verify OFDM symbol duration is substantially similar by evaluating whether compatibility exists between two or more deployed systems on adjacent carriers.

21. A wireless communications apparatus that enables separation of signals within a wireless communications environment, comprising:

means for verifying an Orthogonal Frequency-Division Multiplexing (OFDM) symbol duration between two or more carriers associated with an OFDM network;

means for employing a time synchronization to ensure signal receipt from the two or more carriers have a minimal time offset;

means for receiving a tone spacing from the two or more carriers; and

means for implementing a carrier spacing for the two or more carriers, wherein the carrier spacing is an integer multiple of the tone spacing.

22. The wireless communications apparatus of claim 21, wherein the implemented carrier spacing is received with at least one of a base station, a serving base station, a target base station, a network, a server, a mobile device, a user equipment, an OFDM network, or an eNode B.

23. The wireless communications apparatus of claim 21, wherein the implemented carrier spacing is transmitted from at least one of a base station, a serving base station, a target base station, a network, a server, a mobile device, a user equipment, an OFDM network, or an eNode B.

24. The wireless communications apparatus of claim 21, wherein the OFDM network is at least one of a wireless network, a WiLAN, a WiFi, a router-based network, or a peer-to-peer network.

25. The wireless communications apparatus of claim 21, wherein a network is evaluated to identify a carrier raster, wherein the carrier raster is related to a network and includes a tolerance.

26. The wireless communications apparatus of claim 25, wherein the carrier spacing is calculated based upon identifying a least common multiple between the carrier raster and the tone spacing, wherein the common multiple takes in account the tolerance for flexibility.

27. The wireless communications apparatus of claim 21, wherein the carrier spacing is employed within network in order to separate signals from two or more carriers.

28. The wireless communications apparatus of claim 21, wherein the carrier spacing is utilized with at least one of a base station or a user equipment (UE) in order to separate signals from two or more carriers.

29. The wireless communications apparatus of claim 21, wherein the time synchronization is a satellite navigation system technique.

30. The wireless communications apparatus of claim 21, wherein OFDM symbol duration is verified to be substantially similar by evaluating whether compatibility exists between two or more deployed systems on adjacent carriers.

31. A computer program product, comprising:

a computer-readable medium comprising;

code for causing at least one computer to verify an Orthogonal Frequency-Division Multiplexing (OFDM) symbol duration between two or more carriers;

code for causing at least one computer to employ a time synchronization to ensure signal receipt from the two or more carriers have a minimal time offset;

code for causing at least one computer to receive a tone spacing from the two or more carriers; and

code for causing at least one computer to implement a carrier spacing for the two or more carriers, wherein the carrier spacing is an integer multiple of the tone spacing.

32. The computer program product of claim 31, the computer-readable medium further comprising code for causing at least one computer to receive the implemented carrier spacing with at least one of a base station, a serving base station, a target base station, a network, a server, a mobile device, a user equipment, an OFDM network, or an eNode B.

33. The computer program product of claim 31, the computer-readable medium further comprising code for causing at least one computer to transmit the implemented carrier spacing from at least one of a base station, a serving base station, a target base station, a network, a server, a mobile device, a user equipment, an OFDM network, or an eNode B.

34. The computer program product of claim 31, wherein the OFDM network is at least one of a wireless network, a WiLAN, a WiFi, a router-based network, or a peer-to-peer network.

35. The computer program product of claim 31, the computer-readable medium further comprising code for causing at least one computer to evaluate a network to identify a carrier raster, wherein the carrier raster is related to a network and includes a tolerance.

36. The computer program product of claim 35, the computer-readable medium further comprising code for causing at least one computer to calculate the carrier spacing based upon identifying a least common multiple between the carrier raster and the tone spacing, wherein the common multiple takes in account the tolerance for flexibility.

37. The computer program product of claim 31, the computer-readable medium further comprising code for causing at least one computer to employ the carrier spacing within network in order to separate signals from two or more carriers.

38. The computer program product of claim 31, the computer-readable medium further comprising code for causing at least one computer to utilize the carrier spacing with at least one of a base station or a user equipment (UE) in order to separate signals from two or more carriers.

39. The computer program product of claim 31, wherein the time synchronization is a satellite navigation system technique.

40. The computer program product of claim 31, the computer-readable medium further comprising code for causing at least one computer to verify OFDM symbol duration is substantially similar by evaluating whether compatibility exists between two or more deployed systems on adjacent carriers.