Method and apparatus for very high data rate satellite transmission

• US 7,065,355 B2
• Filed: 01/21/2003
• Issued: 06/20/2006
• Est. Priority Date: 01/21/2003
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Spio, Mary A.
• Primary Examiner(s): TIEU, BINH KIEN
• Application Number:
  US10/348,454
• Publication Number:
  US 20040141530A1
• Time in Patent Office: 1,246 Days
• Field of Search: 455427-428, 455/430, 455 302- 303, 455 305- 306, 455/12.1, 455/13.1, 455/13.3, 342/352, 370/316, 370/532, 370535-536, 348/487, 348491-492, 348/734
• US Class Current: 455/428
• CPC Class Codes: H04B 7/18515 Transmission equipment in satellites or space-based relays
• CPC Class Codes: H04B 7/18543 for adaptation of transmission parameters, e.g. power control for detecting or preventing errors in the information received H04L1/00

Abstract

A method and apparatus for broadcasting a data stream is disclosed. The method comprises the steps of inverse multiplexing the data stream into a first component data stream and a second component data stream and providing the first component data stream to a first transponder and providing the second component data stream to a second transponder. The apparatus comprises an inverse multiplexer, communicatively coupled to the data stream, for separating the data stream into a first component data stream and a second component data stream; an uplink transmitter, for providing the first component data stream to a first transponder and providing the second component data stream to a second transponder.

Claims

1. A method of transmitting a data stream, comprising the steps of:

inverse multiplexing the data stream into a first component data stream and a second component data stream;

providing the first component data stream to a first transponder and providing the second component data stream to a second transponder; and

wherein the step of inverse multiplexing the data steam into a first component data stream and a second component data steam further comprises the steps of

determining an available transmission capacity of the first transponder and an available transmission capacity of the second transponder;

designating a first contiguous portion of the data steam as a member of the first component data stream according to the available transmission capacity of the first transponder; and

designating a second contiguous portion of the data stream temporally adjacent the first contiguous portion of the data steam as a member of the second component data stream according to the available transmission capacity of the second transponder.

2. The method of claim 1, wherein the step of inverse multiplexing the data stream into a first component data stream and a second component data steam comprises the steps of:

designating a firs;

contiguous portion of the data steam as a member of the first component data stream;

designating a second contiguous portion of the data stream temp orally adjacent the first contiguous portion of the data stream as a member of the second component data stream; and

associating a first identifier with the first contiguous portion of the data stream and a second identifier with the second contiguous portion of the data stream.

3. The method of claim 2, wherein the first identifier is a first sequence identifier and the second identifier is a second sequence identifier.

4. The method of claim 3, wherein the step of associating a first identifier with the first contiguous portion of the data stream and a second identifier with the second contiguous pardon of the data stream comprises the steps of:

adding the first sequence identifier to the first contiguous portion of the data stream; and

adding the second sequence identifier to the second contiguous portion of the data stream.

5. The method of claim 4, wherein the first sequence identifier is appended to the first contiguous portion of die data stream and the second sequence identifier is appended to the second contiguous portion of the data stream.

6. The method of claim 4, wherein the first contiguous portion of the data stream is separated into a plurality of packets, each including a header and a portion of the first contiguous portion of the data scream.

7. The method of claim 3, wherein the step of associating a first sequence identifier with the first contiguous portion of the darn steam and a second sequence identifier with the second contiguous portion of the data stream comprises the steps of:

generating a map associating the first sequence identifier with the first contiguous portion of the data stream and the second sequence identifier with the second contiguous portion of the data stream.

8. The method of claim 7, further comprising the steps of:

receiving the first component data stream from the first transponder and the second component data stream from the second transponder;

receiving the map;

reconstructing the data stream from the received first component data stream and the received second component data scream by interleaving the first component data stream and the second data stream according to the first sequence identifier and the second sequence identifier.

9. The method of claim 8, wherein the map is received via a communication path independent of the first transponder and the second transponder.

10. The method of claim 3, further comprising the steps of

receiving the first component data stream from the first transponder and the second component data steam from the second transponder;

reconstructing the data stream from the received first component data stream and the received second component data stream by interleaving die first component data stream and the second data stream according to the first sequence identifier and the second sequence identifier.

11. The method of claim 1, further comprising the steps of:

broadcasting the first component data stream using the first transponder; and

broadcasting the second component data stream using the second transponder.

12. The method of claim 11, wherein the first transponder and the second transponder are disposed on a satellite.

13. The method of claim 11, wherein the firs:

transponder and the second transponder are spatially diverse.

14. The method of claim 13, wherein the first transponder is disposed on a first satellite and the second transponder is disposed on a second satellite.

15. The method of claim 1, further comprising the steps of:

receiving the first component data stream from the first transponder and the second component data steam from the second transponder; and

reconstructing the data stream from the received first component data stream and the received second component data stream by interleaving the first component data stream and the second data stream.

16. The method of claim 15, wherein the step of reconstructing the data steam from the received first component data stream and the received second component data stream according to the sequence identifier comprises the steps of:

buffering the first component data stream and the second component data stream; and

reading the buffered first component data scream and the buffered second component data stream according to the first sequence identifier and the second sequence identifier.

17. The method of claim 1, wherein the step of determining an available transmission capacity of the first transponder and an available transmission capacity of the second transponder comprises the steps of:

determining the available transmission capacity of the first transponder by a difference between a transmission capacity of the first transponder and a measured throughput of the first transponder; and

determining the available transmission capacity of the second transponder by a difference between a transmission capacity of the second transponder and a measured throughput of the second transponder.

18. The method of claim 17, wherein the measured throughput is an average throughput over a measurement period.

19. The method of claim 1, wherein the step of determining an available transmission capacity of the first transponder and an available transmission capacity of the second transponder comprises the steps of:

determining the available transmission capacity of the first transponder by a difference between a transmission capacity of the first transponder and an estimated throughput of the first transponder; and

determining the available transmission capacity of the second transponder by a difference between a transmission capacity of the second transponder and an estimated throughput of the second transponder.

20. The method of claim 1, further comprising the step of:

generating an optimized allocation of the available transmission capacity of the first transponder and the available transmission capacity of the second transponder.

21. An apparatus for transmitting a data steam, comprising:

means for inverse multiplexing the data stream into a first component data stream and a second component data stream;

means for providing the first component data steam to a first transponder and providing the second component data stream to a second transponder; and

wherein the means for inverse multiplexing the data stream into a first component data stream and a second component data stream further comprises

means for determining an available transmission capacity of the first transponder and an available transmission capacity of the second transponder;

means for designating a first contiguous portion of the data stream a member of the first component data stream according to the available transmission capacity of the first transponder; and

means for designating a second contiguous portion of the data stream temporally adjacent the first contiguous pardon of the data stream as a member of the second component data stream according to the available transmission capacity of the second transponder.

22. The apparatus of claim 21, wherein the inverse multiplexer comprises:

means for designating a first contiguous portion of the data stream as a member of the first component data stream;

means for designating a second contiguous portion of the data stream temporally adjacent the first contiguous portion of the data stream as a member of the second component data stream; and

means for associating a first identifier with the first contiguous portion of the data stream and a second identifier with the second contiguous portion of the data stream.

23. The apparatus of claim 22, wherein the first identifier is a first sequence identifier and the second identifier is a second sequence identifier.

24. The apparatus of claim 23, wherein the means for associating a first identifier with the first contiguous portion of the data stream and a second identifier with the second contiguous portion of the data stream comprises:

means for adding the first sequence identifier to the first contiguous portion of the data stream; and

means for adding the second sequence identifier to die second contiguous portion of the data stream.

25. The apparatus of claim 24, wherein the first sequence identifier is appended to the first contiguous portion of the data stream and the second sequence identifier is appended to die second contiguous portion of the data steam.

26. The apparatus of claim 24, wherein the first contiguous portion of the data stream is separated into a plurality of packets, each including a header and a portion of die first contiguous portion of the data stream.

27. The apparatus of claim 23, wherein the means for associating a first sequence identifier with the first contiguous portion of the darn stream and a second sequence identifier with the second contiguous portion of the data stream comprises:

means for generating a map associating the first sequence identifier with die first contiguous portion of the data steam and the second sequence identifier with the second contiguous portion of she data stream.

28. The apparatus of claim 27, father comprising:

means for receiving the first component data steam from the first transponder and the second component data stream from the second transponder;

means for receiving the map;

means for reconstructing the data steam from the received first component data stream and the received second component data stream by interleaving the first component data stream and the second data stream according to the first sequence identifier and the second sequence identifier.

29. The apparatus of claim 28, wherein the map is received via a communication path independent of the first transponder and the second transponder.

30. The apparatus of claim 23, further comprising:

means for receiving the first component data stream from the first transponder and the second component data steam from the second transponder; and

means for reconstructing the data stream from the received first component data steam and the received second component data stream by interleaving the first component data steam and the second data stream according to the first sequence identifier and the second sequence identifier.

31. The apparatus of claim 21, fattier comprising:

means for broadcasting the first component data steam; and

means for broadcasting the second component data stream.

32. The apparatus of claim 31, wherein the means for broadcasting the first component data stream and the means for broadcasting the second component data stream are disposed on a satellite.

33. The apparatus of claim 31, wherein the means for broadcasting the first component data stream and the means for broadcasting the second component data steam are spatially diverse.

34. The apparatus of claim 33, wherein the means for broadcasting the first component data stream is disposed on a first satellite and the means for broadcasting the second component data stream is disposed on a second satellite.

35. The apparatus of claim 21, further comprising:

means for receiving the first component data stream from the first transponder and the second component data stream from the second transponder; and

means for reconstructing the data stream from the received first component data steam and the received second component data stream by interleaving the first component data stream and the second data stream.

36. The apparatus of claim 35, wherein die means for reconstructing the data stream from the received first component data stream and the received second component data stream according to the sequence identifier comprises:

means for buffering the first component data stream and the second component data stream; and

means for reading the buffered first component data steam and the buffered second component data stream according to the first sequence identifier and the second sequence identifier.

37. The apparatus of claim 21, wherein the means for determining an available transmission capacity of the first transponder and an available transmission capacity of the second transponder comprises:

means for determining the available transmission capacity of the first transponder by a difference between a transmission capacity of the first transponder and a measured throughput of the first transponder; and

means for determining die available transmission capacity of the second transponder by a difference between a transmission capacity of the second transponder and a measured throughput of the second transponder.

38. The apparatus of claim 37, wherein the measured throughput is an average throughput over a measurement period.

39. The apparatus of claim 21, wherein the means for determining an available transmission capacity of the first transponder and an available transmission capacity of the second transponder comprises:

means for determining the available transmission capacity of the first transponder by a difference between a transmission capacity of the first transponder and an estimated throughput of the first transponder; and

means for determining the available transmission capacity of the second transponder by a difference between a transmission capacity of the second transponder and an estimated throughput of the second transponder.

40. The apparatus of claim 21, further comprising:

means for generating an optimized allocation of the available transmission capacity of the first transponder and the available transmission capacity of the second transponder.

41. An apparatus for transmitting a data stream, comprising:

an inverse multiplexer, communicatively coupled to the data steam, for separating the data stream into a first component data stream and a second component data steam;

an uplink transmitter, for providing the first component data stream to a first transponder and providing the second component data stream to a second transponder; and

wherein the inverse multiplexer comprises

means for determining an available transmission capacity of the first transponder and an available transmission capacity of the second transponder;

means for designating a first contiguous portion of the data stream as a member of the first component data stream according to the available transmission capacity of the first transponder; and

means for designating a second contiguous portion of the data stream temporally adjacent the first contiguous portion of the data stream as a member of the second component data steam according to the available transmission capacity of the second transponder.

42. The apparatus of claim 41, wherein the inverse multiplexer comprises:

means for designating a first contiguous portion of the data stream as a member of the first component data stream;

means for designating a second contiguous portion of the data stream temporally adjacent the first contiguous portion of the data stream as a member of the second component data stream; and

associating a first identifier with the first contiguous portion of the data stream arid a second identifier with the second contiguous portion of the data stream.

43. The apparatus of claim 42, wherein the first identifier is a first sequence identifier and the second identifier is a second sequence identifier.

44. The apparatus of claim 43, wherein the means for associating a first identifier with the first contiguous portion of the data stream and a second identifier with the second contiguous portion of the data stream comprises:

means for adding the first sequence identifier to the first contiguous portion of the data stream; and

means for adding the second sequence identifier to the second contiguous portion of the data stream.

45. The apparatus of claim 44, wherein the first sequence identifier is appended to the first contiguous portion of the data stream and the second sequence identifier is appended to the second contiguous portion of the data stream.

46. The apparatus of claim 44, wherein the first contiguous portion of the data scream is separated into a plurality of packets, each including a header and a portion of the first contiguous portion of the data stream.

47. The apparatus of claim 43, wherein the means for associating a first sequence identifier with the first contiguous portion of the darn stream and a second sequence identifier with the second contiguous portion of the data stream comprises:

a data mapper, for generating a map associating the first sequence identifier with the first contiguous portion of the data stream and the second sequence identifier with the second contiguous portion of the data stream.

48. The apparatus of claim 47, further comprising:

a receive;

comprising

a tuner for receiving the first component data stream from the first transponder and the second component data stream from the second transponder and for receiving the map;

a processor, communicatively coupled to the tuner, the processor for reconstructing the data stream from the received first component data steam and the received second component data stream by interleaving the first component data stream and the second data stream according to the first sequence identifier and the second sequence identifier.

49. The apparatus of claim 48, wherein the map is received via a communication path independent of the first transponder and the second transponder.

50. The apparatus of claim 43, further comprising:

a receiver, comprising;

a tuner for receiving the first component data stream from the first transponder and the second component data stream from the second transponder; and

a communicatively coupled to the rune;

the processor for reconstructing the data stream from the received first component data stream and the received second component data stream by interleaving the first component data stream and the second data stream according to the first sequence identifier and the second sequence identifier.

51. The apparatus of claim 41, further comprising:

the first transponder; and

the second transponder.

52. The apparatus of claim 51, wherein the first transponder and the second transponder are disposed on a satellite.

53. The apparatus of claim 51, wherein the first transponder and the second transponder are spatially diverse.

54. The apparatus of claim 53, wherein the first transponder is disposed on a first satellite and the second transponder is disposed on a second satellite.

55. The apparatus of claim 41, further comprising:

a receiver, comprising;

a tuner for receiving the first component data steam from the first transponder and the second component data steam from the second transponder; and

a processor, communicatively coupled to the timer, the processor for reconstructing the data stream from the received first component data steam and the received second component data stream by interleaving the first component data stream and the second data stream.

56. The apparatus of claim 41, wherein the means for determining an available transmission capacity off the first transponder and an available transmission capacity of the second transponder comprises:

means for determining the available transmission capacity of the first transponder by a difference between a transmission capacity of the first transponder and a measured throughput of the first transponder; and

means for determining the available transmission capacity of the second transponder by a difference between a transmission capacity of the second transponder and a measured throughput of the second transponder.

57. The apparatus of claim 56, wherein the measured throughput is an average throughput over a measurement period.

58. The apparatus of claim 41, wherein the means for determining an available transmission capacity of the first transponder and an available transmission capacity of the second transponder comprises:

means for determining the available transmission capacity of the first transponder by a difference between a transmission capacity of the first transponder and an estimated throughput of the first transponder; and

means for determining the available transmission capacity of she second transponder by a difference between a transmission capacity of the second transponder and an estimated throughput of the second transponder.

59. The apparatus of claim 55, wherein the means for reconstructing the data stream from the received first component data stream and the received second component data stream according to the sequence identifier comprises:

a buffer, communicatively coupled to the receiver, for storing the first component data stream and the second component data stream; and

wherein the processor reads the buffered first component data stream end the buffered second component data stream according to the first sequence identifier and the second sequence identifier.

60. The apparatus of claim 41, further comprising:

means for generating an optimized allocation of the available transmission capacity of the first transponder and the available transmission capacity of the second transponder.