Method and appartus for dynamic frequency bandwidth allocation

• US 20020187747A1
• Filed: 06/12/2001
• Published: 12/12/2002
• Est. Priority Date: 06/12/2001
• Status: Abandoned Application

• Current Assignee: Space Systems/Loral Incorporated (Loral Space and Communications Incorporated)
• Original Assignee: Space Systems/Loral Incorporated (Loral Space and Communications Incorporated)
• Inventors: Sawdey, James D., Grybos, David P.
• Application Number:
  US09/879,523
• Publication Number:
  US 20020187747A1
• Time in Patent Office: Days
• US Class Current: 455/13.1
• CPC Class Codes: H04B 7/2045 SS-FDMA, FDMA satellite switching

Abstract

A flexible bandwidth satellite communications system, having two communications quartets with at least one controller spot beam per quartet. Each quartet comprises four transponders having multiple type bandwidth filters with controllable pass-bands controlled by a gateway located in an opposite quartet.

Claims

1. A flexible bandwidth satellite communications system, the system comprising:

at least one satellite, the at least one satellite comprising;

at least one controller spot beam;

at least two transponders;

wherein the at least two transponders each comprise;

at least one receive antenna, wherein the at least one receive antenna is adaptable to a multi-mode receiver operating mode, wherein the multi-mode receiver operating mode is selected from the receive mode group consisting of;

receiving a polarized signal,

receiving at least one space division multiple access signal (SDMA), and

receiving a polarized signal and receiving at least one SDMA signal;

at least one transmit antenna having at least one communications spot beam;

wherein the at least one transmit antenna is adaptable to a multi-mode transmitter operating mode, wherein the multi-mode transmitter operating mode is selected from the transmit mode group consisting of

transmitting a polarized signal,

transmitting at least one SDMA signal, and

transmitting a polarized signal and transmitting at least one SDMA signal;

at least one bandwidth filter connectable between the at least one receive antenna and the at least one transmit antenna, the at least one fixed bandwidth filter having a controllable pass-band;

at least one controller gateway, wherein when the at least one controller gateway is not illuminated by either of the at least one communication spot beams the at least one controller gateway is;

adaptable to communicating with the at least one satellite; and

adaptable to controlling the controllable passband via said communications.

2. A flexible bandwidth satellite communications system as in claim 1 wherein the receive mode group consisting of receiving the polarized signal further comprises the receive mode group consisting of receiving a vertically polarized signal carrier.

3. A flexible bandwidth satellite communications system as in claim 1 wherein the receive mode group consisting of receiving the polarized signal further comprises the receive mode group consisting of receiving a horizontally polarized signal carrier.

4. A flexible bandwidth satellite communications system as in claim 1 wherein the transmit mode group consisting of transmitting the polarized signal further comprises the transmit mode group consisting of transmitting a vertically polarized signal carrier.

5. A flexible bandwidth satellite communications system as in claim 1 wherein the transmit mode group consisting of transmitting the polarized signal further comprises the transmit mode group consisting of transmitting a horizontally polarized signal carrier.

6. A flexible bandwidth satellite communications system as in claim 1 wherein the at least one bandwidth filter comprises a fixed bandwidth filter.

7. A flexible bandwidth satellite communications system as in claim 1 wherein the at least one controller gateway is located in an area illuminated by the at least one controller spot beam.

8. A flexible bandwidth satellite communications system as in claim 7 wherein the at least one controller gateway is a ground based station.

9. A flexible bandwidth satellite communications system as in claim 7 wherein the at least one controller gateway is a space based station.

10. A method for dynamic frequency bandwidth allocation in a satellite communications system, the method comprising the steps of:

providing a satellite, the satellite having frequency reuse capability, the frequency reuse capability comprising space division multiple access (SDMA) transceiver capability, or signal polarization transceiver capability, or SDMA transceiver capability and signal polarization transceiver capability;

equipping the satellite with at least four spot communication beams;

providing the satellite with at least four bandwidth filters, the at least four bandwidth filters each having a controllable pass-band, and each of the at least four bandwidth filters corresponding to one of the at least four spot communication beams;

providing a controller gateway; and

using the controller gateway to adjust the at least four bandwidth filters.

11. A method as in claim 10 wherein the step of using the controller gateway to adjust the at least four bandwidth filters further comprises the steps of:

providing each of the at least four bandwidth filters with a predetermined maximum bandwidth; and

assigning each of the at least four bandwidth filters a forward and return channel and guard-band, wherein;

the forward channel comprises a portion of a first contiguous frequency spectrum below the guard-band;

the return channel comprises a portion of a second contiguous frequency spectrum above the guard-band; and

the guard-band comprises a portion of a third contiguous frequency spectrum between the first contiguous frequency spectrum and the second contiguous frequency spectrum;

or

the return channel comprises a portion of the first contiguous frequency spectrum below the guard-band;

the forward channel comprises a portion of the second contiguous frequency spectrum above the guard-band; and

the guard-band comprises a portion of the third contiguous frequency spectrum between the first contiguous frequency spectrum and the second contiguous frequency spectrum.

12. A method as in claim 11 wherein the step of assigning each of the at least four bandwidth filters a forward and return channel and guard-band further comprises the steps of:

analyzing user data to determine the amount of bandwidth required to transmit and receive data on each forward and return channel;

based upon the result of analyzing user data, adjusting the frequency spectrum of each guard-band, each forward channel, and each return channel; and

transmitting the frequency spectrum each guard-band and each forward and return channel occupies to at least one user.

13. A method as in claim 10 wherein the step of providing a controller gateway further comprises the step of illuminating the controller gateway with a controller spot beam.

15. An asynchronous bandwidth satellite communications system as in claim 14 wherein the at least four transponders comprise at least four transceiving antennas, the at least four transceiving antennas each having spot beam generators.

16. An asynchronous bandwidth satellite communications system as in claim 14 wherein the at least four transponders each comprise:

a receive antenna; and

a transmit antenna connectable to the receive antenna, the transmit antenna having at least one spot beam generator.

17. An asynchronous bandwidth satellite communications system as in claim 16 wherein the receive antenna comprises at least one frequency reuse system.

18. An asynchronous bandwidth satellite communications system as in claim 17 wherein the at least one frequency reuse system comprises at least one spatial frequency reuse system.

19. An asynchronous bandwidth satellite communications system as in claim 17 wherein the at least one frequency reuse system comprises at least one polarization frequency reuse.

20. An asynchronous bandwidth satellite communications system as in claim 19 wherein the at least one polarization frequency reuse system comprises a circular polarization frequency reuse system.

21. An asynchronous bandwidth satellite communications system as in claim 19 wherein the at least one polarization frequency reuse system comprises a linear polarization frequency reuse system.

22. An asynchronous bandwidth satellite communications system as in claim 14 wherein the at least one first bandwidth filter comprises a bandwidth filter selected from the group of a first combining multiplexer or a two-channel forward filter.

23. An asynchronous bandwidth satellite communications system as in claim 22 wherein the first combining multiplexer comprises:

a first single channel return filter; and

a second single channel return filter.

24. An asynchronous bandwidth satellite communications system as in claim 23 wherein the first single channel return filter comprises a first frequency spectrum.

25. An asynchronous bandwidth satellite communications system as in claim 23 wherein the second single channel return filter comprises a second frequency spectrum.

26. An asynchronous bandwidth satellite communications system as in claim 14 wherein the at least one second bandwidth filter comprises a bandwidth filter selected from the group of a first demultiplexer or a two-channel return filter.

27. An asynchronous bandwidth satellite communications system as in claim 26 wherein the first demultiplexer comprises a demultiplexer selected from the group of a first single channel forward filter and a second single channel forward filter or a first single channel forward filter, a second single channel forward filter, and a two channel return filter.

28. An asynchronous bandwidth satellite communications system as in claim 27 wherein the first single channel forward filter comprises a third frequency spectrum.

29. An asynchronous bandwidth satellite communications system as in claim 27 wherein the second single channel forward filter comprises a fourth frequency spectrum.

30. An asynchronous bandwidth satellite communications system as in claim 14 wherein the at least one third bandwidth filter comprises a bandwidth filter selected from the group of a second multiplexer, a two-channel return filter, or a first single channel forward filter.

31. An asynchronous bandwidth satellite communications system as in claim 30 wherein the second multiplexer comprises:

the first single channel forward filter; and

the first two-channel return filter.

32. An asynchronous bandwidth satellite communications system as in claim 31 wherein the first single channel forward filter comprises a fifth frequency spectrum.

33. An asynchronous bandwidth satellite communications system as in claim 31 wherein the first two-channel return filter comprises a sixth frequency spectrum.

34. An asynchronous bandwidth satellite communications system as in claim 14 wherein the at least one power amplifier further comprises at least one traveling wave tube amplifier.

35. An asynchronous bandwidth satellite communications system as in claim 14 wherein the at least one ground control station further comprises at least one satellite transponder guard-band controller.

14. An asynchronous bandwidth satellite communications system, the system comprising:

at least one satellite, wherein the at least one satellite comprises;

at least one quartet, wherein the at least one quartet comprises;

at least four transponders, wherein each of the four transponders comprise;

at least one first bandwidth filter;

at least one down-converter connectable to the at least one first bandwidth filter;

at least one second bandwidth filter connectable to the at least one down-converter;

at least one power amplifier connectable to the at least one second bandwidth filter; and

at least one third bandwidth filter connectable to the at least one power amplifier;

at least four data communications beams, wherein each data communications beam comprises at least one first forward channel assignment and at least one first return channel assignment;

a data control beam adaptable to forming a connection with any one of the at least four transponders, wherein the data control beam comprises one second forward channel assignment and one second return channel assignment; and

at least one ground control station adaptable to transceiving the data control beam.