Multiple beamwidth phased array

• US 5,642,358 A
• Filed: 04/08/1994
• Issued: 06/24/1997
• Est. Priority Date: 04/08/1994
• Status: Expired due to Fees

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Ericsson, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Dent, Paul W.
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): VU, HUY DUY
• Application Number:
  US08/225,399
• Time in Patent Office: 1,173 Days
• Field of Search: 370/18, 370/50, 370/69.1, 370/121, 370/76, 370/77, 370/97, 370/104.1, 370/110.1, 455/11.1, 455/12.1, 455/13.1, 455/13.2, 455/13.3, 455/7, 455/54.1, 342/51, 342/42, 342/5, 342/368, 342/365, 342/375
• US Class Current: 370/323
• CPC Class Codes: H01Q 1/288 Satellite antennas
• CPC Class Codes: H01Q 25/00 Antennas or antenna systems providing at least two radiating patterns arrangements for changing or varying the orientation or the shape of the directional pattern H01Q3/00
• CPC Class Codes: H04B 7/2041 Spot beam multiple access

Abstract

A system for wireless communication between at least one first station and a plurality of second stations using a relay station is disclosed. The relay station contains, among other features, an antenna array and a multi-channel transponder. The antenna array has a plurality of antenna elements which are divided into two sets. The first set is used to provide transmission or reception using beams having a first beamwidth and the second set is used to provide transmission or reception using beams having a second beamwidth. The multi-channel transponder, which is connected to the antenna array and a feeder link antenna, receives feeder link signals from at least one of the first stations and converts the signals into drive signals for the antenna array elements. The multi-channel transponder has a first channel bandwidth for channels transponding signals for transmissions having the first beamwidth and a second channel bandwidth for channels transponding signals for transmissions having said second beamwidth. The plurality of second stations is divided dynamically by a switching system into at least a first group that use the narrowest beamwidth and a second group that use the widest beamwidth, according to the path loss requirements for each group.

Claims

1. A system for wireless communication between at least one first station and a plurality of second stations using a relay station, said relay station comprising:

an antenna array having a plurality of antenna elements divided into at least a first set and a second set, said first set being used to provide transmission or reception using beams having a first beamwidth and said second set being used to provide transmission or reception using beams having a second beamwidth, said first beamwidth being greater than said second beamwidth; and

a multi-channel transponder means, connected to said antenna array and to a feeder link antenna, for receiving feeder link signals from said at least one first station and converting said signals into drive signals for said antenna array elements, wherein said multi-channel transponder means uses a first channel bandwidth for transponding signals to be transmitted using said first beamwidth and a second channel bandwidth for transponding signals to be transmitted using said second beamwidth, said first channel bandwidth being greater than said second channel bandwidth.

2. A communications system according to claim 1, wherein said antenna array is a direct radiating phased array.

3. A communications system according to claim 1, wherein said antenna array is a reflecting array comprising an array of feed sources illuminating a reflective surface.

4. A communications system according to claim 3, wherein said feed sources are driven in groups with wideband composite drive signals and said feed sources are driven individually with narrowband drive signals.

5. A communications system according to claim 4, wherein said wideband and narrowband drive signals for driving any particular feed source are summed prior to amplification in an associated power amplifier channel.

6. A communications system according to claim 5, wherein said power amplifier channel is formed between an input to an input combining network for a matrix power amplifier and an output of an output combining network for said matrix power amplifier.

7. A communications system according to claim 1, wherein antenna elements in said first and second sets are divided into subarrays.

8. A communications system according to claim 1, wherein said first and second beamwidths overlap.

9. A communications system according to claim 1, wherein said first and second beamwidths are separate beamwidths.

10. A communications system according to claim 1, wherein said first set of antenna elements includes at least some elements of said second set of antenna elements as a subset.

11. A communications system according to claim 1, wherein said second set of antenna elements includes at least some of said first set of antenna elements as a subset.

32. A system according to claim 1, wherein said second set of antenna elements includes said first set.

12. A multi-channel transponding method for relaying signals from a first station to a plurality of second stations using an antenna array, comprising the steps of:

grouping signals at said first station to be transponded to second stations according to locations of said second stations and processing said signals to form composite signals;

sampling said composite signals to obtain a plurality of analog signal samples wherein composite signals having a wider bandwidth are sampled more often to produce more samples than composite signals having a narrower bandwidth;

multiplexing said analog signal samples with at least one known predetermined sample to form a time-division-multiplexed signal;

modulating said time-division-multiplexed signal onto a first radio frequency carrier for transmission from said first station to a relay station;

receiving said modulated first radio frequency carrier at said relay station and demodulating said transmission to recover said time-division-multiplexed signal;

demultiplexing said demodulated signal to separate recovered analog signal samples, wherein recovered predetermined symbols are used to control said demultiplexing;

for each of said wideband signals, combining recovered samples corresponding to the same wideband composite signal and filtering said samples to restore said wideband composite signal;

filtering samples corresponding to each of said narrowband composite signal to restore said narrowband signals;

converting said restored wideband signals to a second frequency band and amplifying said wideband signals;

transmitting said amplified wideband signals at a first power level using for each signal a power amplifier connected to a radiating antenna element;

converting said restored narrowband signals to said second frequency band and amplifying said narrowband signals; and

transmitting said amplified narrowband signals at a second power level using for each signal a power amplifier connected to a radiating antenna element.

13. A method according to claim 12, wherein said antenna army is a direct radiating phased array.

14. A method according to claim 12, wherein said antenna array is a reflecting array comprising an array of feed sources illuminating a reflective surface.

15. A method system according to claim 14, wherein said feed sources are driven in groups with wideband composite drive signals and said feed sources are driven individually with narrowband drive signals.

16. A method according to claim 12, wherein said step of grouping signals comprises modulating each signal in a group onto a separate frequency channel by frequency-division-multiplexing said signals.

17. A method according to claim 12, wherein said step of grouping signals comprises modulating at least some signals in a group onto the same frequency channel by time-division-multiplexing said signals.

18. A method according to claim 12, wherein said step of grouping signals comprises modulating at least some signals in a group onto the same frequency channel by time-division-multiplexing said signals and another set of signals in the same group onto a different frequency channel by time-division-multiplexing.

19. A method according to claim 12, wherein said step of grouping signals comprises modulating each signal in a group using a separate CDMA code on the same frequency channel and forming a weighted sum of each signal.

20. A method according to claim 12, wherein said processing to form said composite signals comprises digital beam forming.

43. A method system according to claim 15, wherein said wideband and narrowband drive signals for driving any particular feed source are summed prior to amplification in an associated power amplifier channel.

44. A method system according to claim 43, wherein said power amplifier channel is formed between an input of an input combining network for a matrix power amplifier and an output of an output combining network for said matrix power amplifier.

21. A system for wireless communication between one or more first stations and a large plurality of second stations using a relay station, said relay station comprising:

an antenna array having a plurality of antenna elements divided into at least a first set and a second set, said first set being used to provide transmission or reception using beams having a first beamwidth and said second set being used to provide transmission or reception using beams having a second beamwidth; and

a multi-channel transponder means, connected to said antenna array and to a feeder link antenna, for receiving signals from said second stations using said antenna array and processing and combining said signals to obtain a signal for transmission to said first stations using said feeder link antenna, wherein said multi-channel transponder uses a first channel bandwidth for transponding signals received using said first set of antenna elements and a second channel bandwidth for transponding signals received using said second set of antenna elements.

22. A system according to claim 21, wherein said second set of antenna elements includes said first set.

23. A communications system according to claim 21, wherein said antenna array is a direct radiating phased array.

24. A communications system according to claim 21, wherein said antenna array is a reflecting array comprising an array of feed sources illuminating a reflective surface.

25. A communications system according to claim 24, wherein said feed sources are driven in groups with wideband composite drive signals and said feed sources are driven individually with narrowband drive signals.

26. A communications system according to claim 25, wherein said wideband and narrowband drive signals for driving any particular feed source are summed prior to amplification in an associated power amplifier channel.

27. A communications system according to claim 26, wherein said power amplifier channel is formed between an input of an input combining network for a matrix power amplifier and an output of an output combining network for said matrix power amplifier.

28. A communications system according to claim 21, wherein antenna elements in said first and second sets are divided into subarrays.

29. A communications system according to claim 21, wherein said first and second beamwidths overlap.

30. A communications system according to claim 21, wherein said first and second beamwidths are separate beamwidths.

31. A multi-channel transponding method for relaying signals from a plurality of second stations to a first station using an antenna array, comprising the steps of:

receiving first signals using each of a first set of antenna elements;

processing said received first signals using associated transponder channels of a first bandwidth and sampling said processed signals at a first sampling rate to produce a first sample stream corresponding to each channel;

receiving second signals using each of a second set of antenna elements;

processing said received second signals using associated transponder channels of a second bandwidth and sampling said second signals at a second sampling rate to produce a second sample stream corresponding to each channel;

multiplexing said first and second sample streams with at least one known predetermined sample stream to form a time-division-multiplexed signal;

modulating said time-division-multiplexed signal onto a feeder link radio carrier frequency for transmission to said first station;

receiving said modulated feeder link radio frequency carrier at said first station and demodulating it to recover said time-division-multiplexed signal;

demultiplexing said demodulated signal to separate said recovered sample streams including said at least one predetermined sample stream and using said recovered predetermined sample stream to control said demultiplexing;

processing said recovered sample streams to separate signals from different second stations; and

sending said separated signals to a switched telephone transmission network.

33. A method according to claim 31, wherein said antenna array is a direct radiating phased array.

34. A method according to claim 31, wherein said antenna array is a reflecting array comprising an array of feed sources illuminating a reflective surface.

35. A method system according to claim 34, wherein said feed sources are driven in groups with wideband composite drive signals and said feed sources are driven individually with narrowband drive signals.

36. A method system according to claim 35, wherein said wideband and narrowband drive signals for driving any particular feed source are summed prior to amplification in an associated power amplifier channel.

37. A method system according to claim 36, wherein said power amplifier channel is formed between an input to an input combining network for a matrix power amplifier and an output of an output combining network for said matrix power amplifier.

38. A method according to claim 31, wherein each signal in a group is modulated onto a separate frequency channel by frequency-division-multiplexing said signals.

39. A method according to claim 31, wherein at least some signals in a group are modulated onto the same frequency channel by time-division-multiplexing said signals.

40. A method according to claim 31, wherein at least some signals in a group are modulated onto the same frequency channel by time-division-multiplexing said signals and another set of signals in the same group onto a different frequency channel by time-division-multiplexing.

41. A method according to claim 31, wherein each signal in a group is modulated using a separate CDMA code on the same frequency channel and forming a weighted sum of each signal.

42. A method according to claim 31, wherein said processing to form composite signals comprises digital beam forming.