Diversity among narrow antenna beams

• US 6,005,516 A
• Filed: 09/03/1997
• Issued: 12/21/1999
• Est. Priority Date: 06/08/1995
• Status: Expired due to Term

• Current Assignee: Metave Asset Holdings LLC (Intellectual Ventures LLC)
• Original Assignee: Metawave Communications Corp.
• Inventors: Reudink, Douglas O., Feuerstein, Martin J., Reudink, Mark
• Primary Examiner(s): Blum, Theodore M.
• Application Number:
  US08/923,051
• Time in Patent Office: 839 Days
• Field of Search: 342/375, 455/278.1, 455/279.1, 455/277.1, 455/277.2
• US Class Current: 342/375
• CPC Class Codes: H01Q 21/28 Combinations of substantially independent non-interacting antenna units or systems multiple beam H01Q25/00
• CPC Class Codes: H01Q 3/22 varying the orientation in accordance with variation of frequency of radiated wave
• CPC Class Codes: H01Q 3/2682 Time delay steered arrays
• CPC Class Codes: H01Q 3/40 with phasing matrix

Abstract

A receiving system 100 is disclosed which includes at least one antenna 101 providing a plurality of antenna beams providing signal diversity between communicated signals. A first processing branch 103 is included for processing a first plurality of signals appearing within a first plurality of the antenna beams. The first processing branch 103 includes a plurality of signal paths, some of which include delays 105, each receiving a one of the first plurality of signals from a corresponding one of the first plurality of antenna beams. Delays 105 apply a predetermined amount of delay proportionate to the corresponding one of the beams. First processing branch 103 further includes a combiner 106 for combining the first plurality of signals after output from the plurality of signal paths. A second processing branch 104 is provided for processing a second plurality of signals appearing within a second plurality of the antenna beams. Second processing branch 104 includes a plurality of signal paths, some of which include delays 105, each receiving one of the second plurality of signals from a corresponding one of the second plurality of antenna beams. Delays 105 applying a pre-selected amount of delay to the corresponding one of the beams. Second processing branch 104 further includes a combiner 106 for combining the second plurality of signals after output from the plurality of signal paths. Finally, a radio 102 is provided having a first port coupled to an output of first processing branch 103 and a second port coupled to a second processing branch 104.

Claims

1. A communication system comprising:

an antenna array providing a plurality of antenna beams, said antenna array adapted for providing signal diversity between beam signals, wherein said signal diversity is provided at least in part by ones of said antenna beams having diverse polarizations, a first group thereof having a first polarization and a second group thereof having a second polarization;

a first processing branch for processing first beam signals, said first beam signals associated with a first selected set of one or more of said antenna beams, said first processing branch comprising;

a first plurality of signal paths wherein at least one signal path is a delay path, each of said signal paths communicating at least one of said first beam signals with a corresponding antenna beam in said first selected set thereof, wherein said delay path introduces a preselected amount of delay to signals communicated thereby; and

a combiner for combining said first beam signals, said first plurality of signal paths being disposed between said combiner and said antenna array;

a second processing branch for processing second beam signals, said second beam signals appearing within a second selected set of one or more of said antenna beams, said second processing branch comprising;

at least one signal path communicating at least one of said second beam signals with a corresponding antenna beam in said second selected set thereof, and

a radio apparatus having a first port coupled to an interface of said first processing branch and a second port coupled to an interface of said second processing branch.

2. The communication system of claim 1, wherein said radio apparatus comprises a Rake receiver.

3. The communication system of claim 1, wherein said radio apparatus comprises a signaling radio.

4. The communication system of claim 1, wherein beams of said plurality of beams are narrow beams providing azimuthal coverage of less than 120 degrees.

5. The communication system of claim 1, wherein beams of said first group of polarization diverse antenna beams are substantially overlapped by beams of said second group of polarization diverse antenna beams.

6. The communication system of claim 1, wherein said signal diversity is provided at least in part by ones of said antenna beams disposed to provide angular diversity.

7. The communication system of claim 6, wherein said signal diversity is also provided at least in part by ones of said antenna beams having diverse polarizations.

8. The communication system of claim 1, wherein said signal diversity is provided at least in part by ones of said antenna beams disposed to provide spatial diversity.

9. The communication system of claim 8, wherein said signal diversity is also provided at least in part by ones of said antenna beams disposed to provide angular diversity.

10. The communication system of claim 1, wherein said signal diversity is also provided at least in part by ones of said antenna beams disposed to provide spatial diversity, and said signal diversity is further provided at least in part by ones of said antenna beams disposed to provide angular diversity.

11. The communication system of claim 1, wherein each signal path of said first plurality of signal paths introduces substantially the same amount of delay as said preselected amount of delay.

12. The communication system of claim 11, wherein said preselected amount of delay comprises the length of said signal paths.

13. The communication system of claim 1, in which the second processing branch further comprises:

a second plurality of signal paths wherein at least one signal path is a delay path, each of said signal paths communicating at least one of said second beam signals with a corresponding antenna beam in said second selected set thereof, wherein said delay path introduces a preselected amount of delay to signals communicated thereby; and

a combiner for combining said second beam signals, said second plurality of signal paths being disposed between said combiner and said antenna array.

14. The communication system of claim 13, wherein:

each of said second selected set of antenna beams is arranged in a hierarchy; and

said preselected amount of delay introduced by each of said at least one delay path of said second processing branch is a function of each of said antenna beam'"'"'s hierarchal position and a predetermined constant delay period.

15. The communication system of claim 14, wherein said preselected constant delay is selected to exceed a signal resolution of said radio apparatus.

16. The communication system of claim 13, wherein:

said preselected amount of delay introduced by each of said at least one delay path of said second processing branch is different.

17. The system of claim 13, wherein said second plurality of signal paths comprises at least one undelayed signal path.

18. The system of claim 1, wherein said first plurality of signal paths comprises at least one undelayed signal path.

19. The communication system of claim 1, wherein:

said preselected amount of delay introduced by each of said at least one delay path of said first processing branch is different.

20. The communication system of claim 1, wherein:

each of said first selected set of antenna beams is arranged in a hierarchy; and

said preselected amount of delay introduced by each of said at least one delay path of said first processing branch is a function of each of said antenna beam'"'"'s hierarchal position and a predetermined constant delay period.

21. The communication system of claim 20, wherein said preselected constant delay is selected to be long enough to exceed a signal resolution of said radio apparatus.

22. The communication system of claim 1, wherein said antenna array comprises a multibeam antenna.

23. The communication system of claim 1, wherein said antenna array comprises a plurality of discrete antennas.

24. The communication system of claim 1, wherein said combiner is a summing device.

25. The communication system of claim 24, wherein the summing device sums said plurality of signals giving weight to the signal strength on each signal path.

26. The communication system of claim 25, wherein the weight given is proportional to the signal strength.

27. The communication of claim 1, wherein said combiner means includes a selector switch to exclude certain signal paths according to the signal strength on those paths.

28. A method of providing wireless communication signals between communication devices, wherein diverse renditions of said signals are associated with a sector and diversity port of a CDMA radio, said method including the steps of:

arranging a plurality of antenna beams to illuminate an area in which signals are expected to be communicated, said antenna beams adapted to provide said diversity between signals;

distributing the signals associated with ones of the beams so that a preselected group of the signals are distributed by first circuitry and other ones of the signals are distributed by second circuitry;

processing the signals, wherein said processing step includes the substeps of;

delaying at least one of the signals distributed by said first circuitry by a first preselected amount; and

combining ones of the signals together to form two signal sets, one set for presentation to the sector input and one set for presentation to the diversity input of said CDMA radio.

29. The method of claim 28, wherein said diversity between signals is provided at least in part by ones of said antenna beams having different polarizations, a first group thereof having a first polarization and a second group thereof having a second polarization.

30. The method of claim 29, wherein beams of said first group of polarization diverse antenna beams are substantially overlapped by beams of said second group of polarization diverse antenna beams.

31. The method of claim 29, wherein said plurality of beams are narrow beams and beams of said first group of polarization diverse antenna beams are interlaced with beams of said second group of polarization diverse antenna beams.

32. The method of claim 28, wherein said diversity between signals is provided at least in part by ones of said antenna beams disposed to provide different angular views.

33. The method of claim 32, wherein said diversity between signals is also provided at least in part by ones of said antenna beams having different polarizations, a first group thereof having a first polarization and a second group thereof having a second polarization.

34. The method of claim 28, wherein said diversity between signals is provided at least in part by ones of said antenna beams disposed to provide significant spatial separation.

35. The method of claim 32, wherein said diversity between signals is also provided at least in part by ones of said antenna beams having different polarizations, a first group thereof having a first polarization and a second group thereof having a second polarization.

36. The method of claim 32, wherein said diversity between signals is also provided at least in part by ones of said antenna beams disposed to provide different angular views.

37. The method of claim 28, wherein said diversity between signals is provided at least in part by ones of said antenna beams disposed to provide significant spatial separation, said diversity between signals is also provided at least in part by ones of said antenna beams having different polarizations, a first group thereof having a first polarization and a second group thereof having a second polarization, and said diversity between signals is also provided at least in part by ones of said antenna beams disposed to provide different angular views.

38. The method of claim 28, wherein said delaying step includes the step of:

delaying each of the signals distributed by said first circuitry by a delay substantially same as said first preselected amount.

39. The method of claim 38, wherein said preselected amount of delay is introduced by the length of said signal paths.

40. The method of claim 28, wherein said processing step further comprises the substeps of:

not delaying at least one of the signals distributed by said first circuitry; and

not delaying at least one of the signals distributed by said second circuitry.

41. The method of claim 28, wherein said processing step further comprises the substep of delaying at least one of the signals distributed by said second circuitry by a second preselected amount.

42. The method of claim 41 wherein said first and second preselected amounts of delay are the same.

43. The method of claim 41, wherein said preselected amounts of delay are selected to exceed a signal resolution of said CDMA radio.

44. The method of claim 42, wherein each of said first and second preselected amounts of delay are characterized as DN/2, where D is a unit of delay and N is a hierarchal number of the antenna beam associated with a particular delay.

45. The method of claim 42, wherein said preselected amounts of delay introduced by each of said at least one delay path of said second processing branch is different.

46. The method of claim 42, wherein said preselected amounts of delay introduced by each of said at least one delay path of said first processing branch is different.

47. The method set forth in claim 28, further including the step of:

selecting, from among all of the signals, a subset thereof to be distributed in said distributing step wherein said selected signals meet a given criterion.

48. The method of claim 28, wherein adjacent antenna beams of said preselected group of antenna beams have alternate polarization.

49. A system comprising:

a plurality of antenna beams having beam signals associated therewith, said beam signals providing signal diversity between ones of beam signals of said plurality of antenna beams;

a first processing branch for processing first beam signals, said first beam signals associated with a first selected set of one or more of said antenna beams, said first processing branch comprising;

a first plurality of signal paths, each of said signal paths communicating at least one of said first beam signals with a corresponding antenna beam in said first selected set thereof; and

a combiner for combining said first beam signals;

a second processing branch for processing second beam signals, said second beam signals associated with a second selected set of one or more of said antenna beams, wherein said first and second sets of antenna beams are mutually exclusive, said second processing branch comprising;

a second plurality of signal paths, each of said signal paths communicating at least one of said second beam signals with a corresponding antenna beam in said second selected set thereof; and

a combiner for combining said second beam signals; and

a radio apparatus having a first port coupled to an output of said first processing branch and a second port coupled to an output of said second processing branch.

50. The system of claim 49, wherein beams of said plurality of beams are narrow beams providing azimuthal coverage of less than 120 degrees.

51. The system of claim 49, wherein said signal diversity is provided at least in part by ones of said antenna beams having diverse polarizations, a first group thereof having a first polarization and a second group thereof having a second polarization.

52. The system of claim 49, wherein said signal diversity is provided at least in part by ones of said antenna beams disposed to provide angular diversity.

53. The system of claim 52, wherein said signal diversity is also provided at least in part by ones of said antenna beams having diverse polarizations.

54. The system of claim 49, wherein said signal diversity is provided at least in part by ones of said antenna beams disposed to provide spatial diversity.

55. The system of claim 54, wherein said signal diversity is also provided at least in part by ones of said antenna beams having diverse polarizations.

56. The system of claim 54, wherein said signal diversity is also provided at least in part by ones of said antenna beams disposed to provide angular diversity.

57. The system of claim 49, wherein said signal diversity is provided at least in part by ones of said antenna beams disposed to provide spatial diversity, said signal diversity also provided at least in part by ones of said antenna beams having diverse polarizations, and said signal diversity further provided at least in part by ones of said antenna beams disposed to provide angular diversity.

58. A wireless communications system, comprising:

a plurality of antennas, said antennas disposed to communicate signals on beams having a narrow beam width, said beams adapted to provide substantially uncorrelated signals;

a CDMA receiver, said receiver having a number of inputs less than or equal to the number of said plurality of antennas;

at least one first undelayed path and at least one first delay path, said paths coupling corresponding first ones of said beams with a first input port of said receiver, each of said first delay paths also introducing a predetermined amount of delay to a signal received from a corresponding one of said first ones of said beams; and

at least one second undelayed path and at least one second delay path, said paths coupling corresponding second ones of said beams with a second input port of said receiver, each of said second delay paths also introducing a predetermined amount of delay to a signal received from a corresponding one of said second ones of said beams.

59. The system of claim 58, wherein said substantially uncorrelated signals are provided at least in part by ones of said antenna beams having polarization diversity, a first group thereof having a first polarization and a second group thereof having a second polarization.

60. The system of claim 59, wherein said first group is associated with said first signal paths and said second group is associated with said second signal paths.

61. The system of claim 60, wherein beams of said first group are substantially overlapped by beams of said second group, and a cross-over of a pair of said first group of beams coincides with a peak of a beam of said second group.

62. The system of claim 59, wherein ones said first group are interlaced with beams of said second group, said interlace beams being associated with said first signal paths.

63. The system of claim 58, wherein said substantially uncorrelated signals are provided at least in part by ones of said antenna beams having angular diversity.

64. The system of claim 63, wherein said substantially uncorrelated signals are also provided at least in part by ones of said antenna beams having polarization diversity.

65. The system of claim 58, wherein said substantially uncorrelated signals are provided at least in part by ones of said antenna beams having spatial diversity.

66. The system of claim 65, wherein said substantially uncorrelated signals are also provided at least in part by ones of said antenna beams having polarization diversity.

67. The system of claim 65, wherein said substantially uncorrelated signals are also provided at least in part by ones of said antenna beams having angular diversity.

68. The system of claim 58, wherein said substantially uncorrelated signals are provided at least in part by ones of said antenna beams having spatial diversity, said substantially uncorrelated signals also provided at least in part by ones of said antenna beams having polarization diversity, and said substantially uncorrelated signals also provided at least in part by ones of said antenna beams having angular diversity.

69. The receiving system of claim 58, wherein said first input port of said receiver is a sector input port and said second input of said receiver is a diversity input port.

70. The system of claim 58, wherein said predetermined delay introduced by each of said first and second delay paths is a function of placement of an associated antenna beam in a hierarchy of antenna beams.

71. A system for use in communicating signals between a plurality of communication devices, said system comprising:

a communication device having at least a first and second signal port associated therewith;

a plurality of signal beams, ones of said plurality of signal beams being adapted to utilize signals having alternate ones of a set of signal attributes to thereby provide diverse signal attributes, wherein said diverse signal attributes are provided at least in part by ones of said signal beams having different polarization wherein ones of said plurality of signal beams are identified as a first set of signal beams and ones of said plurality of signal beams are identified as a second set of signal beams;

a first signal feed network associated with said first set of signal beams communicating signals of said first set of signal beams between said first set of signal beams and said first port of said communication device, said first signal feed network introducing at least one delay into a signal of said first set of signal beams; and

a second signal feed network associated with said second set of signal beams communicating signals of said second set of signal beams between said second set of signal beams and said second port of said communication device.

72. The system of claim 71, wherein said diverse signal attributes are provided at least in part by ones of said signal beams having different angular disposition.

73. The system of claim 71, wherein said diverse signal attributes are provided at least in part by ones of said signal beams having different spatial disposition.

74. The system of claim 71, wherein adjacent signal beams of said first set of signal beams have alternate polarization of said different polarization.