Methods of reducing interference including applying weights to provide correction signals and related systems

• US 7,974,575 B2
• Filed: 03/09/2009
• Issued: 07/05/2011
• Est. Priority Date: 03/15/2005
• Status: Active Grant

• Current Assignee: ATC Technology Corporation (FedEx Corporation)
• Original Assignee: ATC Technology Corporation (FedEx Corporation)
• Inventors: Karabinis, Peter D.
• Primary Examiner(s): Anderson; Matthew D.
• Assistant Examiner(s): Aminzay; Shaima Q
• Application Number:
  US12/400,152
• Publication Number:
  US 20090170428A1
• Time in Patent Office: 848 Days
• Field of Search: 455/12.1, 455/3.02, 455/3.01, 455/63.1, 455/9, 455 131- 133, 455/67.13, 455/414.1, 455/422.1, 455427-430, 455/455, 455/500, 455/501, 455/562.1, 370/310, 370/316, 370/317, 375/130, 375/133, 375/144, 375/148, 375/346, 342/354
• US Class Current: 455/12.1
• CPC Class Codes: H04B 7/1851 Systems using a satellite or space-based relay H04B7/18508, H04B7/18521 take precedence; providing specific services H04B7/18523 - H04B7/18576
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system

Abstract

Methods of reducing interference in a satellite communications system may include receiving a plurality of feeder link signals and time aligning the plurality of feeder link signals to provide time aligned feeder link signals. At least two of the time aligned feeder link signals may be combined to provide reduced interference of at least one of the feeder link signals. Related systems are also discussed.

Claims

1. A method of reducing interference in a satellite communications system, the method comprising:

providing first and second feeder link signals;

applying a first weight to the second feeder link signal to provide a first correction signal;

combining the first correction signal with the first feeder link signal to provide a first interference reduced feeder link signal;

applying a second weight to the first feeder link signal to provide a second correction signal; and

combining the second correction signal with the second feeder link signal to provide a second interference reduced feeder link signal.

2. A method according to claim 1 wherein the first and second feeder link signals are provided by at least one Space-Based Component (SBC).

3. A method according to claim 1 wherein the first and second feeder link signals are provided by at least one Ground-Based equipment (GBE).

4. A method according to claim 1 wherein the first and second feeder link signals are delay equalized therebetween.

5. A method according to claim 1 further comprising:

providing an error of a received feeder link signal;

wherein combining the correction signal with the first feeder link signal further comprises modifying the first and/or second feeder link signal(s) responsive to the error.

6. A method according to claim 5 wherein the received feeder link signal includes an information component, and wherein providing an error of a received feeder link signal comprises comparing the information component with at least one value of the received feeder link signal.

7. A method according to claim 6 wherein the information component is compared with the at least one value of the received feeder link signal at a Space-Based Component (SBC).

8. A method according to claim 6 wherein the information component is compared with the at least one value of the received feeder link signal at a Ground-Based Equipment (GBE).

9. A method according to claim 6 wherein the information component comprises a-priori known information.

10. A method according to claim 1 wherein the first and second feeder link signals are provided between the same satellite and the respective first and second terrestrial feeder link antennas.

11. A method according to claim 1 wherein the first feeder link signal is provided between a first terrestrial feeder link antenna and at least one satellite, wherein the second feeder link signal is provided between a second terrestrial feeder link antenna and the at least one satellite, and wherein the first and second terrestrial feeder link antennas are spaced apart.

12. A satellite communications system comprising:

a processor configured to apply a first weight to a second feeder link signal to provide a first error correction signal, and to combine the first error correction signal with a first feeder link signal to provide a first interference reduced feeder link signal, wherein the processor is further configured to apply a second weight to the first feeder link signal to provide a second error correction signal, and to combine the second error correction signal with the second feeder link signal to provide a second interference reduced feeder link signal.

13. A satellite communications system according to claim 12 wherein the first and second feeder link signals are provided to the processor by spatially diverse paths and/or different antenna patterns.

14. A satellite communications system according to claim 12 wherein the interference reduced feeder link signal and/or the second interference reduced feeder link signal is/are provided at a system component that is spatially distant from and/or spatially proximate to the processor.

15. A satellite communications system according to claim 14 wherein the system component that is spatially distant from the processor is a Space-Based Component (SBC) and/or a Ground-Based Equipment (GBE) and/or wherein the system component that is spatially proximate to the processor is a SBC and/or a GBE.

16. A satellite communications system according to claim 12 wherein the processor is further configured to process an error of a feeder link signal and to provide at least one interference reduced feeder link signal responsive to the processing of the error.

17. A satellite communications system according to claim 16 wherein the feeder link signal includes an information component, wherein the information component is used to derive the error by comparing the information component with at least one value of the feeder link signal.

18. A satellite communications system according to claim 17 wherein the error is derived at a Space-Based Component (SBC) and/or at a Ground-Based Equipment (GBE) and/or is transmitted to the SBC and/or to the GBE.

19. A satellite communications system according to claim 17 wherein the error is derived at a Space-Based Component (SBC) and/or at a Ground-Based Equipment (GBE) and is used at the SBC and/or to the GBE.

20. A satellite communications system according to claim 17 wherein the information component comprises a-priori known information.

21. A satellite communications system according to claim 12 wherein the first and second feeder link signals are provided between the same satellite and the respective first and second terrestrial feeder link antennas.

22. A satellite communications system according to claim 12 wherein the first feeder link signal is provided between a first terrestrial feeder link antenna and at least one satellite, wherein the second feeder link signal is provided between a second terrestrial feeder link antenna and the at least one satellite, and wherein the first and second terrestrial feeder link antennas are spaced apart.