Intra-system and/or inter-system reuse of feeder link frequencies including interference suppression systems and methods

• US 7,634,229 B2
• Filed: 03/14/2006
• Issued: 12/15/2009
• 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:
  US11/375,277
• Publication Number:
  US 20060276129A1
• Time in Patent Office: 1,372 Days
• Field of Search: 455/12.1, 455/13.1, 455/13.2, 455/13.3, 455/13.4, 455/3.02, 455/63.1, 455/422.1, 455/427, 455/428, 455/436, 375/130, 375/150, 375/299, 370/329, 370/342, 370/442, 370/466, 370/316, 370/320, 342/354, 342/357.06, 342/357.1, 342/361, 244/158.4
• 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:

transmitting a plurality of feeder link signals;

receiving the plurality of feeder link signals; and

combining at least two feeder link signals of the plurality of feeder link signals to reduce an interference level in at least one feeder link signal of the plurality of feeder link signals;

wherein the interference level occurs following said transmitting a plurality of feeder link signals.

2. A method according to claim 1 wherein receiving the plurality of feeder link signals comprises receiving the plurality of feeder link signals at a respective plurality of geographically separated feeder link antenna elements of a Ground-Based Equipment (GBE) and wherein combining comprises combining the at least two of the plurality of feeder link signals that are received at the respective geographically separated feeder link antenna elements to reduce the interference level in the at least one feeder link signal of the plurality of feeder link signals.

3. A method according to claim 2 wherein receiving a plurality of feeder link signals comprises receiving a plurality of feeder link signals from a single Space-Based Component (SBC).

4. A method according to claim 2 wherein receiving the plurality of feeder link signals comprises receiving the plurality of feeder link signals from a plurality of Space-Based Components (SBCs) and wherein combining comprises combining the at least two of the plurality of feeder link signals that are received from the plurality of Space-Based Components (SBCs) to reduce the interference level in the at least one feeder link signal of the plurality of feeder link signals.

5. A method according to claim 1 further comprising:

processing at least one first feeder link signal to time align the at least one first feeder link signal with at least one second feeder link signal.

6. A method according to claim 5 wherein processing at least one first feeder link signal comprises processing a first feeder link signal using a first delay circuit.

7. A method according to claim 6 wherein processing at least one first feeder link signal also comprises processing a second feeder link signal using a second delay circuit.

8. A method according to claim 7 wherein at least one of the first and second feeder link signals includes timing information, the method further comprising:

detecting the timing information and setting at least one delay value of the first and/or second delay circuits responsive to the detected timing information.

9. A method according to claim 1 wherein receiving a plurality of feeder link signals comprises receiving a plurality of feeder link signals at a respective plurality of feeder link antenna elements of a Space-Based Component (SBC).

10. A method according to claim 1 wherein receiving the plurality of feeder link signals comprises receiving the plurality of feeder link signals from a respective plurality of different Space-Based Components (SBCs) and/or wherein combining comprises combining the at least two of the plurality of feeder link signals received from different Space-Based Components (SBCs) to reduce the interference level in the at least one feeder link signal of the plurality of feeder link signals.

11. A method according to claim 1 wherein the at least two feeder link signals are received at geographically separated feeder link antenna elements of Ground-Based Equipment (GBE).

12. A method according to claim 1 wherein the at least two feeder link signals are received from geographically separated feeder link antenna elements of Ground-Based Equipment (GBE).

13. A method according to claim 1 wherein the at least two feeder link signals are received at different Space-Based Components (SBCs).

14. A method according to claim 1 wherein the at least two feeder link signals are received from different Space-Based Components (SBCs).

15. A satellite communications system comprising:

a plurality of feeder link transmitters that are configured to transmit a respective plurality of feeder link signals;

a plurality of feeder link receivers that are configured to receive the respective plurality of feeder link signals; and

a processor that is configured to combine at least two feeder link signals, of the respective plurality of feeder link signals that are received, to reduce an interference level in at least one feeder link signal.

16. A satellite communications system according to claim 15 wherein measures of the at least two feeder link signals are received at the processor from at least one Space-Based Component (SBC) and/or Ground-Based Equipment (GBE).

17. A satellite communications system according to claim 16 wherein the measures are received at the processor over spatially diverse paths and/or antenna patterns.

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

19. A satellite communications system according to claim 15 wherein the processor is further configured to time align the at least two feeder link signals prior to combining thereof.

20. A satellite communications system according to claim 19 wherein the processor is configured to time align the at least two feeder link signals by processing a first one of the at least two feeder link signals through a delay circuit.

21. A satellite communications system according to claim 20 wherein the processor is further configured to time align the at least two feeder link signals by processing a second one of the at least two feeder link signals through a second delay circuit.

22. A satellite communications system according to claim 21 wherein at least one of the at least two feeder link signals includes timing information, and wherein the processor is further configured to detect the timing information and to provide a time alignment responsive to the timing information.

23. A satellite communications system according to claim 15 wherein the at least two feeder link signals are received at geographically separated feeder link antenna elements of Ground-Based Equipment (GBE).

24. A satellite communications system according to claim 15 wherein the at least two feeder link signals are transmitted from geographically separated feeder link antenna elements of Ground-Based Equipment (GBE).

25. A satellite communications system according to claim 15 wherein the at least two feeder link signals are received at different Space-Based Components (SBCs).

26. A satellite communications system according to claim 15 wherein the at least two feeder link signals are transmitted from different Space-Based Components (SBCs).