Methods of reducing interference including calculation of weights based on errors and related systems

• US 7,970,346 B2
• Filed: 03/09/2009
• Issued: 06/28/2011
• 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): Ghebretinsae; Temesghen
• Assistant Examiner(s): Aminzay; Shaima Q
• Application Number:
  US12/400,160
• Publication Number:
  US 20090170429A1
• Time in Patent Office: 841 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, 714/701
• 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 an error of a received feeder link signal wherein the received feeder link signal is received over a feeder link between a Space-Based Component (SBC) and Ground-Based Equipment (GBE);

providing first and second feeder link signals;

calculating a weight based on the error;

applying the weight to the second feeder link signal to provide an error correction signal;

combining the error correction signal with a component of the first feeder link signal to provide an interference reduced feeder link signal; and

transmitting the interference reduced feeder link signal over the feeder link between the Space-Based Component (SBE) and the Ground-Based Equipment (GBE).

2. A method according to claim 1 wherein the received feeder link signal is received at the Space-Based Component (SBC) or at the Ground-Based Equipment (GBE).

7. A method according to claim 2 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.

8. A method according to claim 7 wherein the comparing is performed at the Space-Based Component (SBC) and/or at the Ground-Based equipment (GBE).

9. A method according to claim 8 wherein a result of the comparing is transmitted to the Space-Based Component (SBC) and/or to the Ground-Based equipment (GBE).

10. A method according to claim 7 wherein the information component comprises a-priori known information.

11. A method according to claim 2 further comprising:

calculating a second weight;

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

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

12. A method according to claim 11 wherein the first and second feeder link signals are provided by the Space-Based component (SBC) and/or by the Ground-Based equipment (GBE).

13. A method according to claim 11 wherein the interference reduced feeder link signal and/or the second interference reduced signal is/are transmitted to/by the Space-Based Component (SBC) or the Ground-Based Equipment (GBE).

14. A method according to claim 11 wherein the combining takes place at the Space-Based Component (SBC) and/or at the Ground-Based Equipment (GBE).

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

providing an error of a received feeder link signal wherein the received feeder link signal is received at a Space-Based Component (SBC) or at Ground-Based Equipment (GBE);

providing first and second feeder link signals;

calculating a weight based on the error;

applying the weight to the second feeder link signal to provide an error correction signal;

combining the error correction signal with a component of the first feeder link signal to provide an interference reduced feeder link signal;

calculating a second weight;

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

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

4. A method according to claim 3 wherein the first and second feeder link signals are provided by a Space-Based component (SBC) and/or by a Ground-Based equipment (GBE).

5. A method according to claim 3 wherein the interference reduced feeder link signal and/or the second interference reduced signal is/are transmitted to/by a Space-Based Component (SBC) or a Ground-Based Equipment (GBE).

6. A method according to claim 3 wherein the combining takes place at the Space-Based Component (SBC) and/or at the Ground-Based Equipment (GBE).

15. A satellite communications system comprising:

a processor configured to process an error of a received feeder link signal wherein the received feeder link signal is received over a feeder link between a Space-Based Component (SBC) and Ground-Based Equipment (GBE), to process first and second feeder link signals, to calculate a weight to be applied to the second feeder link signal based on the error, to apply the weight to the second feeder link signal to provide an error correction signal, to combine the error correction signal with a component of the first feeder link signal to provide a first interference reduced signal, and to transmit the interference reduced signal over the feeder link between the Space-Based Component (SBC) and the Ground-Based Equipment (GBE).

16. A satellite communications system according to claim 15 wherein the processor is at the Space-Based Component (SBC) and/or at the Ground-Based Equipment (GBE).

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

22. A satellite communications system according to claim 21 wherein the comparing is performed the Space-Based Component (SBC) and/or at the Ground-Based Equipment (GBE).

23. A satellite communications system according to claim 22 wherein a result of the comparing is transmitted to the Space-Based Component (SBC) and/or to the Ground-Based Equipment (GBE).

24. A satellite communications system according to claim 21 wherein the information component comprises a-priori known information.

25. A satellite communications system according to claim 16 wherein the processor is further configured to calculate a second weight to be applied to the first feeder link signal to provide a second error correction signal, and to combine the second error correction signal with a component of the second feeder link signal to provide a second interference reduced signal.

26. A satellite communications system according to claim 25 wherein the first and second feeder link signals are provided to the processor via spatially diverse paths and/or different antenna patterns.

27. A satellite communications system according to claim 25 wherein the first and second interference reduced signals are provided by the processor over spatially diverse paths and/or different antenna patterns.

28. A satellite communications system according to claim 25 wherein the first and/or second interference reduced signals are provided by the processor to the Space-Based Component (SBC) and/or to the Ground-Based equipment (GBE).

17. A satellite communications system comprising:

a processor at a Space-Based Component (SBC) and/or at Ground-Based Equipment (GBE), wherein the processor is configured to process an error of a feeder link signal, to process first and second feeder link signals, to calculate a weight to be applied to the second feeder link signal based on the error, to apply the weight to the second feeder link signal to provide an error correction signal, and to combine the error correction signal with a component of the first feeder link signal to provide a first interference reduced signal wherein the processor is further configured to calculate a second weight to be applied to the first feeder link signal to provide a second error correction signal, and to combine the second error correction signal with a component of the second feeder link signal to provide a second interference reduced signal.

18. A satellite communications system according to claim 17 wherein the first and second feeder link signals are provided to the processor via spatially diverse paths and/or different antenna patterns.

19. A satellite communications system according to claim 17 wherein the first and second interference reduced signals are provided by the processor over spatially diverse paths and/or different antenna patterns.

20. A satellite communications system according to claim 17 wherein the first and/or second interference reduced signals are provided by the processor to the Space-Based Component (SBC) and/or to the Ground-Based equipment (GBE).