Establishing remote beam forming reference line

• US 6,320,540 B1
• Filed: 12/07/1999
• Issued: 11/20/2001
• Est. Priority Date: 12/07/1999
• Status: Expired due to Term

• Current Assignee: Kathrein SE
• Original Assignee: Metawave Communications Corp.
• Inventors: Meredith, Sheldon K.
• Primary Examiner(s): Issing, Gregory C.
• Application Number:
  US09/456,194
• Time in Patent Office: 714 Days
• Field of Search: 342/383, 342/373, 342/174, 342/368, 342/377, 342/173
• US Class Current: 342/377
• 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: H01Q 3/26 varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture H01Q3/12, H01Q3/22, H01Q3/24 take precedence
• CPC Class Codes: H01Q 3/2605 Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
• CPC Class Codes: H01Q 3/40 with phasing matrix

Abstract

A system and method for establishing a beam forming phase reference line remote from an antenna system is taught. By providing a phase reference line at a selected position in the signal path the present invention allows for a beam forming matrix to be utilized in providing distributed amplification without requiring additional power sharing matrix arrangements. Moreover, disposing of the phase reference line at a selected point in the signal path according to the present invention allows for multi-mode communications wherein both switched beam and adaptive beam forming may be utilized.

Claims

1. A system providing phase reference line at a point in a signal path remote from an antenna utilized in forming desired antenna patterns, said system comprising:

a plurality of signal manipulators, each signal manipulator of said plurality disposed in a signal path coupled to said antenna, wherein a point of said signal path each of said signal manipulators is disposed is between said antenna and circuitry adapted to define said desired antenna patterns;

a controller coupled to said plurality of signal manipulators adapted to provide control signals thereto to selectively manipulate signal attributes of signals communicated through said signal paths to provide a beam forming phase reference line at said point of said signal path said signal manipulators are disposed; and

a signal attribute monitoring circuit, wherein signal attributes which may be manipulated by said signal manipulators under control of said controller are monitored for intelligent control of said signal manipulators by said controller, wherein said signal attribute monitoring circuit comprises a first coupler introducing a calibration signal into each said signal path and a second coupler receiving said calibration signal introduced into each said signal path.

2. The system of claim 1, wherein said plurality of signal manipulators comprise:

circuitry adapted to provide a cycle of a communicated signal having a desired phase relationship.

3. The system of claim 2, wherein said plurality of signal manipulators further comprise:

circuitry adapted to provide said cycle of said communicated signal to within a wavelength of said desired phase relationship.

4. The system of claim 1, wherein said plurality of signal manipulators comprise:

circuitry adapted to provide a desired amplitude of a communicated signal.

5. The system of claim 1, wherein said plurality of signal manipulators comprise:

circuitry adapted to filter undesired frequencies from a communicated signal.

6. The system of claim 1, wherein said circuitry adapted to define said desired antenna patterns includes a beam forming matrix.

7. The system of claim 6, wherein said circuitry adapted to define said desired antenna patterns includes a plurality of beam forming matrices.

8. The system of claim 6, wherein said beam forming matrix includes a plurality of inputs each associated with a particular antenna pattern of said desired antenna patterns and a plurality of outputs each coupled to a signal manipulator of said plurality of signal manipulators.

9. The system of claim 8, further comprising:

signal amplification circuitry disposed in the signal path between each said output of said plurality of outputs and said antenna.

10. The system of claim 9, wherein signal amplification circuitry affects signal attributes differently with respect to a signal communicated between a first output of said plurality of outputs and said antenna than a signal communicated between a second output of said plurality of outputs and said antenna, and wherein said controller provides a control signal to a first signal manipulator of said plurality of manipulators in response to information from said signal attribute monitoring circuit in order to remediate said different signal attribute.

11. The system of claim 9, wherein said signal amplification circuitry provides higher power amplifiers in particular signal paths coupled to said antenna and lower power amplifiers in other signal paths coupled to said antennas.

12. The system of claim 11, further comprising:

circuitry for selecting a higher power amplifier of said signal amplification circuitry for use with signals to be radiated in a radiation pattern co-extensive with multiple ones of the desired antenna patterns.

13. The system of claim 8, further comprising:

signal combining circuitry disposed in the signal path between each said output of said plurality of outputs and a corresponding signal manipulator of said plurality of signal manipulators, wherein said signal combining circuitry is coupled to signals not communicated through said beam forming matrix to thereby establish a multiple mode communication system.

14. The system of claim 13, wherein a first mode of said multiple mode communication system switchably utilizes ones of said antenna patterns defined by said beam forming matrix and a second mode of said multiple mode communication system utilizes antenna patterns co-extensive with multiple ones of said antenna patterns defined by said beam forming matrix.

15. The system of claim 13, wherein a first mode of said multiple mode communication system is associated with a first communication service and a second mode of said multiple mode communication system is associated with a second communication service.

16. The system of claim 15, wherein said first communication service is an analogue communication service and said second communication service is a digital communication service.

17. The system of claim 1, wherein said first coupler introduces said calibration signal into each said signal path at a point near said circuitry adapted to define ones of said plurality of antenna patterns and said second coupler receives said calibration signal at a point in each said signal path near said antenna.

18. The system of claim 1, wherein said first coupler introduces said calibration signal into each said signal path at a point in each said signal path near said antenna and said second coupler receives said calibration signal at a point near said circuitry adapted to define ones of said plurality of antenna patterns.

19. The system of claim 1, wherein monitoring of said signal attributes is accomplished at least in part through a relationship of said calibration signal as introduced in a signal path with said calibration signal as received from said signal path.

20. A method for providing a beam forming phase reference line at a point in a signal path remote from a plurality of antennas utilized in forming a plurality of antenna beams, said method comprising the steps of:

providing a plurality of signal paths wherein each signal path of said plurality of signal paths is associated with one of said plurality of antennas;

disposing a plurality of signal manipulators in said plurality of signal paths, wherein a point of said signal path each of said signal manipulators is disposed is between said associated antenna and circuitry adapted to define ones of said plurality of antenna beams;

coupling a controller to each signal manipulator of said plurality of signal manipulators;

coupling a signal attribute monitoring circuit to said controller and to each signal path of said plurality of signal paths;

monitoring signal attributes of signals communicated by ones of said plurality of signal paths, wherein monitoring said signal attributes comprises;

introducing a calibration signal into ones of said signal paths; and

receiving said calibration signal introduced into said signal paths at a point in said signal paths remote from the introduction of said calibration signal; and

manipulating signal attributes of selected ones of said signals communicated by ones of said plurality of signal paths under control of control signals provided by said controller to provide a beam forming phase reference line at said point of said signal path said signal manipulators are disposed.

21. The method of claim 20, wherein said manipulating step comprises the step of:

providing a cycle of a communicated signal with a desired phase relationship.

22. The method of claims 21, wherein said manipulating step further comprises the step of:

providing said cycle of said communicated signal to within a wavelength of said desired phase relationship.

23. The method of claim 20, wherein said circuitry adapted to define ones of said plurality of antenna beams includes a beam forming matrix.

24. The method of claim 23, wherein said beam forming matrix includes a plurality of inputs each associated with a particular antenna beam of said plurality of antenna beams and a plurality of outputs each coupled to a signal manipulator of said plurality of signal manipulators.

25. The method of claim 24, further comprising the steps of:

disposing a plurality of amplifiers in a plurality of said signal paths at a point of said signal path between said signal manipulators and said a corresponding one of said antennas; and

amplifying signals communicated through ones of the signal paths.

26. The method of claim 24, further comprising the steps of:

disposing signal combining circuitry in the signal path between each said output of said plurality of outputs and a corresponding signal manipulator of said plurality of signal manipulators; and

coupling said signal combining circuitry to signals not communicated through said beam forming matrix to thereby establish a multiple mode communication system.

27. The method of claim 26, wherein a first mode of said multiple mode communication system is associated with a first communication service and a second mode of said multiple mode communication system is associated with a second communication service.

28. The method of claim 25, wherein said amplification step affects signal attributes differently with respect to a signal communicated in a signal path associated with a first signal manipulator of said plurality of signal manipulators than a signal communicated in a signal path associated with a second signal manipulator of said plurality of signal manipulators, and wherein said manipulating step remediates said difference in signal attributes.

29. The method of claim 25, wherein said signal amplification circuitry provides higher power amplifiers in particular signal paths coupled to said antenna and lower power amplifiers in other signal paths coupled to said antennas.

30. The system of claim 29, further comprising:

selecting a higher power amplifier of said signal amplification circuitry for use with signals to be radiated in a radiation pattern co-extensive with multiple ones of the desired antenna patterns.

31. A system comprising:

an antenna having a plurality of antenna interfaces to provide communication of signals provided thereto within multiple antenna beams;

a beam forming matrix having a plurality of matrix interfaces coupled to said plurality of antenna interfaces;

means for adjusting a phase of signals communicated between said beam forming matrix and said antenna, wherein said phase adjusting means provides independent phase adjustment of signals provided between ones of said plurality of matrix interfaces and corresponding ones of said antenna interfaces;

means for dynamically controlling said phase adjusting means comprising;

means for monitoring signal attributes of signals communicated between said beam forming matrix and said antenna; and

means for determining a phase adjustment amount at said phase adjusting means suitable for providing a desired phase relationship at said signal attribute monitoring means; and

means for combining signals which are not communicated through said beam forming matrix with signals which are communicated through said beam forming matrix, wherein said combining means is disposed in signal paths between ones of said plurality of matrix interfaces and corresponding ones of said antenna interfaces.

32. The system of claim 31, further comprising:

means for amplifying signals communicated bet ween said beam forming matrix and said antenna.

33. The system of claim 32, wherein said amplifying means comprises:

a suite of amplifiers, wherein amplifiers of said suite of amplifiers are not matched to other amplifiers of said suite of amplifiers, and wherein said manipulating means remediates said amplifier mismatches.

34. The system of claim 31, wherein said manipulating step comprises:

means for providing a time delay; and

means for providing a phase shift.

35. The system of claim 31, wherein said signals which are not communicated through said beam forming matrix are associated with a first communication service and said signals which are communicated through said beam forming matrix are associated with a second communication service.

36. The system of claim 31, wherein said beam forming matrix includes at least one Butler matrix.

37. A multiple mode communication system adapted to provide both predefined antenna beams and antenna patterns independent of said predefined antenna beams, said system comprising:

an antenna array having a plurality of antenna interfaces;

a first signal source providing first signals to be radiated in said antenna patterns;

a second signal source providing second signals to be radiated in said antenna beams;

a first beam forming matrix having a plurality of inputs associated with said predefined antenna beams coupled to said second signal source and having a plurality of outputs coupled to corresponding antenna interfaces of said plurality of antenna interfaces thereby providing a first plurality of signal paths between said plurality of outputs and said plurality of antenna interfaces;

a signal combiner apparatus coupled to said first signal source and to said plurality of outputs;

first phase adjustment apparatus disposed in said first plurality of signal paths adapted to provide independent phase adjustment of combined signals communicated through ones of said first plurality of signal paths; and

signal amplitude adjustment apparatus disposed in said first plurality of signal paths adapted to provide independent amplitude adjustment of combined signals communicated through ones of said first plurality of signal paths.

38. The system of claim 37, further comprising:

a controller coupled to said phase adjustment apparatus and to ones of said first plurality of signal paths, wherein said controller monitors a phase relationship of signals communicated through said ones of said first plurality of signal paths and controls said phase adjustment apparatus to provide a desired monitored phase relationship.

39. The system of claim 38, wherein said controller is coupled to said ones of said first plurality of signal paths in at least two places each.

40. The system of claim 39, wherein a first said place said controller is coupled is at a point in said ones of said first plurality of signal paths near said outputs of said beam forming matrix and a second said place said controller is coupled is at a point in said ones of said first plurality of signal paths near said antenna interfaces.

41. The system of claim 37, further comprising:

a first signal receiver accepting first signals associated with said antenna patterns;

a second signal receiver accepting second signals associated with said antenna beams;

a first beam forming matrix having a plurality of inputs associated with said predefined antenna beams coupled to said second signal source and having a plurality of outputs coupled to corresponding antenna interfaces of said plurality of antenna interfaces thereby providing a first plurality of signal paths between said plurality of outputs and said plurality of antenna interfaces;

a second beam forming matrix having a plurality of outputs associated with said predefined antenna beams coupled to said second signal receiver and having a plurality of inputs coupled to corresponding antenna interfaces of said plurality of antenna interfaces thereby providing a second plurality of signal paths between said plurality of inputs and said plurality of antenna interfaces;

second phase adjustment apparatus disposed in said second plurality of signal paths adapted to provide independent phase adjustment of signals communicated through ones of said second plurality of signal paths;

a signal divider apparatus coupled to said plurality of outputs associated with said predefined antenna beams and to said first signal receiver; and

duplexer circuitry disposed in said first and second plurality of signal paths adapted to couple said plurality of interfaces of said antenna array to said first signal source and said second signal source and said first signal receiver and said second receiver.

42. A system providing phase reference line at a point in a signal path remote from an antenna utilized in forming desired antenna patterns, said system comprising:

a plurality of signal manipulators, each signal manipulator of said plurality disposed in a signal path coupled to said antenna, wherein a point of said signal path each of said signal manipulators is disposed is between said antenna and circuitry adapted to define said desired antenna patterns;

a controller coupled to said plurality of signal manipulators adapted to provide control signals thereto to selectively manipulate signal attributes of signals communicated through said signal paths to provide a beam forming phase reference line at said point of said signal path said signal manipulators are disposed;

a signal attribute monitoring circuit, wherein signal attributes which may be manipulated by said signal manipulators under control of said controller are monitored for intelligent control of said signal manipulators by said controller; and

signal combining circuitry disposed in the signal path between each output of a plurality of outputs of said circuitry adapted to define said desired antenna patterns and a corresponding signal manipulator of said plurality of signal manipulators, wherein said signal combining circuitry is coupled to signals not communicated through said circuitry adapted to define said desired antenna patterns to thereby establish a multiple mode communication system.

43. The system of claim 42, wherein a first mode of said multiple mode communication system is associated with a first communication service and a second mode of said multiple mode communication system is associated with a second communication service.

44. The system of claim 43, wherein said first communication service is an analogue communication service and said second communication service is a digital communication service.

45. The system of claim 42, wherein a first mode of said multiple mode communication system switchably utilizes ones of said antenna patterns defined by said circuitry adapted to define said desired antenna patterns and a second mode of said multiple mode communication system utilizes antenna patterns co-extensive with multiple ones of said antenna patterns defined by said circuitry adapted to define said desired antenna patterns.

46. A method for providing a beam forming phase reference line at a point in a signal path remote from a plurality of antennas utilized in forming a plurality of antenna beams, said method comprising the steps of:

providing a plurality of signal paths each associated with one of said plurality of antennas;

disposing a plurality of signal manipulators in said plurality of signal paths, wherein a point of said signal path each of said signal manipulators is disposed is between said associated antenna and circuitry adapted to define ones of said plurality of antenna beams;

coupling a controller to each said plurality of signal manipulators;

coupling a signal attribute monitoring circuit to said controller and to each signal path of said plurality of signal paths;

monitoring signal attributes of signals communicated by ones of said plurality of signal paths;

manipulating signal attributes of selected ones of said signals communicated by ones of said plurality of signal paths under control of control signals provided by said controller to provide a beam forming phase reference line at said point of said signal path said signal manipulators are disposed;

disposing signal combining circuitry in the signal path between each output of a plurality of outputs of said circuitry adapted to define ones of said plurality of antenna beams and a corresponding signal manipulator of said plurality of signal manipulators; and

coupling said signal combining circuitry to signals not communicated through said circuitry adapted to define ones of said plurality of antenna beams to thereby establish a multiple mode communication system.

47. The method of claim 46, wherein a first mode of said multiple mode communication system is associated with a first communication service and a second mode of said multiple mode communication system is associated with a second communication service.

48. A method for providing a beam forming phase reference line at a point in a signal path remote from a plurality of antennas utilized in forming a plurality of antenna beams, said method comprising the steps of:

providing a plurality of signal paths, wherein each signal path of said plurality of signal paths is associated with one of said plurality of antennas;

disposing a plurality of signal manipulators in said plurality of signal paths, wherein a point of said signal path each of said signal manipulators is disposed is between said associated antenna and circuitry adapted to define ones of said plurality of antenna beams, wherein said circuitry adapted to define ones of said plurality of antenna beams includes a beam forming matrix, and wherein said beam forming matrix includes a plurality of inputs each associated with a particular antenna beam of said plurality of antenna beams and a plurality of outputs each coupled to a signal manipulator of said plurality of signal manipulators;

coupling a controller to each signal manipulator of said plurality of signal manipulators;

coupling a signal attribute monitoring circuit to said controller and to each signal path of said plurality of signal paths;

monitoring signal attributes of signals communicated by ones of said plurality of signal paths;

manipulating signal attributes of selected ones of said signals communicated by ones of said plurality of signal paths under control of control signals provided by said controller to provide a beam forming phase reference line at said point of said signal path said signal manipulators are disposed;

disposing a plurality of amplifiers in a plurality of said signal paths at a point of said signal path between said signal manipulators and said a corresponding one of said antennas, wherein said signal amplification circuitry provides higher power amplifiers in particular signal paths coupled to said antenna and lower power amplifiers in other signal paths coupled to said antennas;

amplifying signals communicated through ones of the signal paths; and

selecting a higher power amplifier of said signal amplification circuitry for use with signals to be radiated in a radiation pattern co-extensive with multiple ones of the desired antenna patterns.