System and method for providing polarization matching on a cellular communication forward link

• US 6,889,061 B2
• Filed: 01/26/2001
• Issued: 05/03/2005
• Est. Priority Date: 01/27/2000
• Status: Expired due to Fees

• Current Assignee: Celletra Ltd. (Unity Wireless Corp.)
• Original Assignee: Celletra Ltd. (Unity Wireless Corp.)
• Inventors: Levy, David, Shapira, Joseph
• Primary Examiner(s): Trinh, Sonny
• Application Number:
  US10/181,295
• Publication Number:
  US 20030092402A1
• Time in Patent Office: 1,558 Days
• Field of Search: 455/562.1, 455/561, 455/560, 455/550.1, 455/403, 455/423, 455/433, 342/361, 342/372, 342/359, 342/367, 342/368
• US Class Current: 455/562.1
• CPC Class Codes: H04B 7/0615 of weighted versions of same signal
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity

Abstract

A base station for a wireless communication system is capable of transmitting signals that match the polarization state of a mobile station by including an antenna arrangement having at least one set of transmit antenna elements and at least one set of receive antenna elements, a transformation mechanism having at least one antenna port coupled to the antenna arrangement and at least one beam port, and an adaptive measurement and control mechanism coupled to the transmit and receive antenna port signals and configured to measure and adaptively control attributes of the transmit and receive antenna port signals.

Claims

1. A base station, comprising:

an antenna arrangement including at least one set of transmit antenna elements configured to transmit radiated beam patterns and at least one set of receive antenna elements configured to receive radiated beam patterns, each antenna element within said set of transmit antenna elements and said set of receive antenna elements containing different polarization states;

a transformation mechanism including at least one antenna port coupled to said antenna arrangement and at least one beam port, said transformation mechanism configured to transform a plurality of receive antenna port signals generated from said set of receive antenna elements into a plurality of receive beam port signals and to transform a plurality of transmit beam port signals into a plurality of transmit antenna port signals capable of being transmitted by said set of transmit antenna elements; and

an adaptive measurement and control mechanism coupled to said transmit and receive antenna port signals, said measurement and control mechanism configured to measure and adaptively control attributes of said transmit and receive antenna port signals,

wherein said measurement and control mechanism utilizes the attributes of said receive antenna port signals to adaptively adjust the polarization states of said set of transmit antenna elements in order to transmit beam patterns matching a polarization state of a mobile station.

2. The base station of claim 1, further comprising

a combiner mechanism coupled to said beam ports of said transformation mechanism, said combiner mechanism configured to combine said receive beam port signals received from said transformation mechanism into an aggregate receive information signal, and

a splitter mechanism coupled to said beam ports of said transformation mechanism, said splitter mechanism configured to divide an aggregate transmit information signal into said transmit beam port signals supplied to said transformation mechanism.

3. The base station of claim 2, further comprising

antenna port signal adjustments coupled to said antenna ports of said transformation mechanism for adjusting said attributes of said transmit antenna port signals and receive antenna port signals coupled thereto, said antenna port signal adjustments including at least one of an amplitude adjustment, a gain adjustment, and a phase adjustment.

4. The base station of claim 3, wherein said adaptive measurement and control mechanism controls attributes of said receive antenna port signals by measuring attribute information of said aggregate receive information signal received from said combiner mechanism and supplying receive adaptive adjustment information to said antenna port signal adjustments for said receive antenna port signals.

5. The base station of claim 4, wherein said adaptive measurement and control mechanism adjusts polarization states of said set of transmit antenna elements by supplying said receive adaptive adjustment information to said transformation mechanism.

6. The base station of claim 5, wherein said adaptive measurement and control mechanism further includes a filtering device configured to filter out fast variations of said receive adaptive adjustment information.

7. The base station of claim 6, wherein said filtering device is configured to provide transmit adaptive adjustment information to said antenna port signal adjustments for said transmit antenna port signals.

8. The base station of claim 4, further comprising

beam port signal adjustments coupled to said beam ports of said transformation mechanism for regulating attributes of transmit and receive beam port signals coupled thereto, said beam port signal adjustments including at least one of an amplitude adjustment, a gain adjustment, and a phase adjustment.

9. The base station of claim 4, wherein said antenna arrangement is configured as a multi-columnar antenna configuration, each column of said multi-columnar antenna configuration containing said at least one set of transmit antenna elements and said at least one set of receive antenna elements.

10. The base station of claim 4, wherein said transformation mechanism includes

a plurality of receive transformation matrices having said antenna ports respectively coupled to said set of receive antenna elements and configured to transform said receive antenna port signals into said receive beam port signals, and

a plurality of transmit transformation matrices having said antenna ports respectively coupled to said set of transmit antenna elements and configured to transform said transmit beam port signals into said transmit antenna port signals.

11. A wireless communication system, comprising:

at least one mobile station; and

at least one base station communicating with said at least one mobile station, said base station including

an antenna arrangement including at least one set of transmit antenna elements configured to transmit radiated beam patterns and at least one set of receive antenna elements configured to receive radiated beam pattern, each antenna element within said at least one set of transmit antenna elements and said at least one set of receive antenna elements containing a plurality of polarization states;

a transformation mechanism including at least one antenna port coupled to said antenna arrangement and at least one beam port, said transformation mechanism configured to transform a plurality of receive antenna port signals generated from said set of receive antenna elements into a plurality of receive beam port signals and to transform a plurality of transmit beam port signals into a plurality of transmit antenna port signals capable of being transmitted by said set of transmit antenna elements; and

an adaptive measurement and control mechanism coupled to said transmit antenna port signals and said receive antenna port signals, said measurement and control mechanism configured to measure and adaptively control attributes of said transmit antenna port signals and said receive antenna port signals,

wherein said measurement and control mechanism utilizes the attributes of said receive antenna port signals to adaptively adjust the polarization states of said set of transmit antenna elements in order to transmit beam patterns matching a polarization state of said mobile station.

12. The wireless communication system of claim 11, wherein said base station further includes

a combiner mechanism coupled to said beam ports of said transformation mechanism, said combiner mechanism configured to combine said receive beam port signals received from said transformation mechanism into an aggregate receive information signal, and

a splitter mechanism coupled to said beam ports of said transformation mechanism, said splitter mechanism configured to divide an aggregate transmit information signal into said transmit beam port signals supplied to said transformation mechanism.

13. The wireless communication system of claim 12, wherein said base station further includes antenna port signal adjustments coupled to said antenna ports of said transformation mechanism for adjusting said attributes of said transmit antenna port signals and said receive antenna port signals coupled thereto, said antenna port signal adjustments including at least one of an amplitude adjustment, a gain adjustment, and a phase adjustment.

14. The wireless communication system of claim 13, wherein said adaptive measurement and control mechanism controls attributes of said receive antenna port signals by measuring attribute information of said aggregate receive information signal received from said combiner mechanism and supplying receive adaptive adjustment information to said antenna port signal adjustments for said receive antenna port signals.

15. The wireless communication system of claim 14, wherein said adaptive measurement and control mechanism adjusts polarization states of said set of transmit antenna elements by supplying said receive adaptive adjustment information to said transformation mechanism.

16. The wireless communication system of claim 15, wherein said adaptive measurement and control mechanism includes a filtering device configured to filter out fast variations of said receive adaptive adjustment information.

17. The wireless communication system of claim 16, wherein said filtering device is configured to provide transmit adaptive adjustment information to said antenna port signal adjustments for said transmit antenna port signals.

18. The wireless communication system of claim 17, wherein said base station further includes beam port signal adjustments coupled to said beam ports of said transformation mechanism for regulating attributes of transmit and receive beam port signals coupled thereto, said beam port signal adjustments including at least one of an amplitude adjustment, a gain adjustment, and a phase adjustment.

19. The wireless communication system of claim 14, wherein said antenna arrangement is configured as a multi-columnar antenna configuration, each column of said multi-columnar antenna configuration containing said at least one set of transmit antenna elements and said at least one set of receive antenna elements.

20. The wireless communication system of claim 14, wherein transformation mechanism includes

a plurality of receive transformation matrices having said antenna ports respectively coupled to said set of receive antenna elements and configured to transform said receive antenna port signals into said receive beam port signals, and

a plurality of transmit transformation matrices having said antenna ports respectively coupled to said set of transmit antenna elements and configured to transform said transmit beam port signals into said transmit antenna port signals.

21. A wireless communication system, comprising:

at least one mobile station; and

at least one base station communicating with said at least one mobile station, said base station including

an antenna arrangement including a plurality of antenna element sets configured to transmit and receive radiated beam patterns, said antenna element sets having a plurality of different polarization states and each antenna element within each of said antenna element sets having a similar polarization state;

a channel switch mechanism coupled to said antenna arrangement, said channel switch mechanism configured to channel a plurality of receive antenna port signals and a plurality of transmit antenna port signals and to switch between said antenna element sets;

a transformation mechanism including a plurality of antenna ports coupled to said channel switch mechanism and a plurality of beam ports, said transformation mechanism configured to transform said receive antenna port signals generated from said antenna element sets into a plurality of receive beam port signals and to transform said transmit beam port signals into a plurality of transmit antenna port signals capable of being transmitted by said antenna element sets;

a comparator mechanism coupled to said plurality of beam ports of said transformation mechanism, said comparator mechanism configured to detect signal strength of said receive antenna port signals and determine strongest receive signal information;

a switch controller mechanism coupled to said comparator mechanism, said switch controller configured to control said channel switch mechanism,

wherein said switch controller mechanism utilizes said strongest receive signal information to direct said channel switch mechanism to switch to said antenna element corresponding to said strongest receive signal in order to transmit beam patterns matching a polarization state of a mobile station.

22. The wireless communication system of claim 21, wherein said base station further includes a duplexer mechanism coupled to said channel switch mechanism and configured to discriminate between transmit and receive operations.

23. The wireless communication system of claim 22, wherein said base station further includes a combiner mechanism coupled to said beam ports of said transformation mechanism, said combiner mechanism configured to combine said receive beam port signals received from said transformation mechanism into an aggregate receive information signal.

24. The wireless communication system of claim 23, wherein said base station further includes a splitter mechanism coupled to said beam ports of said transformation mechanism, said splitter mechanism configured to divide an aggregate transmit information signal into said transmit beam port signals supplied to said transformation mechanism.

25. The base station of claim 24, wherein base station further includes beam port signal adjustments coupled signals to said beam ports of said transformation mechanism for adjusting attributes of said transmit beam port and said receive beam port signals coupled thereto, said beam port signal adjustments including at least one of amplitude, gain, and phase adjustments.

26. The wireless communication system of claim 25, wherein said comparator mechanism includes

a diversity combiner configured to diversity combine channeled receive antenna port signals within each channel, and

an envelope detection mechanism coupled to said diversity combiner and configured to determine the signal strength of each of said channeled receive antenna port signals.

27. The wireless communication system of claim 26, wherein said comparator mechanism further includes a filter mechanism coupled to said envelope detection mechanism and configured to filter said channeled receive antenna port signals in order to determine time average signal strength of each of said channeled receive antenna port signals.

28. The wireless communication system of claim 27, wherein said comparator mechanism further includes a comparator coupled to said filter mechanism, said comparator configured to compare the time average signal strength of each of said channeled receive antenna port signals, to determine the strongest channeled receive antenna port signal, and to generate a control information signal indicating which of said channeled receive antenna port signals is the strongest signal,

wherein said comparator is configured to provide said control information to said switch control mechanism to direct said channel switch mechanism to switch to said antenna elements corresponding to said strongest channelized receive antenna port signal.

29. The wireless communication system of claim 28, wherein said antenna arrangement is configured as a multi-columnar antenna configuration, each column of said multi-columnar antenna configuration containing said sets of antenna elements.

30. The wireless communication system of claim 29, wherein said transformation mechanism includes

a plurality of receive transformation matrices having said antenna ports respectively coupled to said antenna element sets and configured to transform said receive antenna port signals into said receive beam port signals, and

a plurality of transmit transformation matrices having said antenna ports respectively coupled to said antenna element sets and configured to transform said transmit beam port signals into said transmit antenna port signals.

31. A base station, comprising:

an antenna arrangement including a plurality of antenna element sets configured to transmit and receive radiated beam patterns, said antenna element sets containing a plurality of different polarization states;

a polarization detection mechanism coupled to said antenna arrangement, said polarization detection mechanism configured to detect polarization states of a plurality of receive signals received from said antenna element sets and to produce an adaptive polarization map indicating the polarization states for different time slots of said receive signals; and

a switch control mechanism coupled to said polarization detection mechanism, said switch control mechanism configured to switch between said antenna element sets,

wherein said switch control mechanism switches to a particular antenna element set based on said polarization map provided by said polarization detection mechanism in order to transmit beam patterns that match a polarization state of a mobile station.

32. The base station of claim 31, further comprising:

a splitter mechanism coupled to said antenna arrangement, said splitter mechanism configured to divide said receive signals received from said antenna element sets into a plurality of receive signal time slots.

33. The base station of claim 32, further comprising:

a combiner mechanism coupled to said antenna arrangement, said combiner mechanism configured to combine a plurality of transmit signal time slots into a plurality of transmit signals capable of being transmitted by said antenna arrangement.

34. The base station of claim 33, wherein said polarization detection mechanism includes

a plurality of narrowband receivers coupled to said receive signal time slots having predetermined polarization states,

a plurality of envelope detectors coupled to each of said narrowband receivers and configured to calculate average envelope signal strength output by each of said narrowband receivers, and

a plurality of integrating devices coupled to each of said envelope detectors and configured to calculate average receive power for each of said receive signal time slots.

35. The base station of claim 34, wherein said polarization detection mechanism further includes a polarity comparator mechanism configured to compare an average receive power for each of said receive signal time slots and to determine a polarization states for each of said receive signal times slots in order to produce said adaptive polarization map.

36. The base station of claim 35, wherein said switch control mechanism includes switch control logic which implements a decision rule based on said adaptive polarization map to determine when to switch said transmit signals to a particular antenna element set that matches said polarization state of said mobile station.

37. The base station of claim 36, wherein said decision rule is based on at least one of decision inputs from an external source, decision inputs from a centralized control station, and decision routines internal to said switch control logic.

38. The base station of claim 37, wherein said internal decision routines of said switch control logic includes

determining a number of said receive signal time slots having a first polarization state,

determining a number of said receive signal time slots having a second polarization state,

comparing said number of said receive signal time slots having said first polarization state to said number of said receive signal time slots having said second polarization state to determine which number is greater, and

directing said switch control mechanism to switch said transmit signals to an antenna element set having a polarization state that matches said polarization state of said greater number.

39. The base station of claim 38, wherein said antenna arrangement is configured as a multi-columnar antenna configuration, each column of said multi-columnar antenna configuration containing said sets of antenna elements.

40. The base station of claim 39, wherein said antenna element sets contain two opposing linearly-slanted polarization states.

41. A wireless communication system, comprising:

at least one mobile station; and

at least one base station communicating with said mobile station, said base station including,

an antenna arrangement including a plurality of antenna element sets configured to transmit and receive radiated beam patterns, said antenna element sets containing different polarization states;

a polarization detection mechanism coupled to said antenna arrangement, said polarization detection mechanism configured to detect polarization states of a plurality of receive signals received from said antenna element sets and to produce an adaptive polarization map indicating the polarization states for a plurality of different time slots of said receive signals;

a switch control mechanism coupled to said polarization detection mechanism, said switch control mechanism configured to switch between said antenna element sets,

wherein said switch control mechanism switches to a particular antenna element set based on said polarization map provided by said polarization detection mechanism in order to transmit beam patterns that match a polarization state of a mobile station.

42. The wireless communication system of claim 41, wherein said base station further includes a splitter mechanism coupled to said antenna arrangement, said splitter mechanism configured to divide said receive signals received from said antenna element sets into a plurality of receive signal time slots.

43. The wireless communication system of claim 42, wherein said base station further includes a combiner mechanism coupled to said antenna arrangement, said combiner mechanism configured to combine a plurality of transmit signal time slots into a plurality of transmit signals capable of being transmitted by said antenna arrangement.

44. The wireless communication system of claim 43, wherein said polarization detection mechanism includes

a plurality of narrowband receivers coupled to said receive signal time slots having predetermined polarization states,

a plurality of envelope detectors coupled to each of said narrowband receivers and configured to calculate average envelope signal strength output by each of said narrowband receivers, and

a plurality of integrating devices coupled to each of said envelope detectors and configured to calculate an average receive power for each of said receive signal time slots.

45. The wireless communication system of claim 44, wherein said polarization detection mechanism further includes a polarity comparator mechanism configured to compare said average receive power for each of said receive signal time slots and to determine a polarization state for each of said receive signal times slots in order to produce said adaptive polarization map.

46. The wireless communication system of claim 45, wherein said switch control mechanism includes switch control logic which implements a decision rule based on said adaptive polarization map to determine when to switch said transmit signals to a particular antenna element set that matches said polarization state of said mobile station.

47. The wireless communication system of claim 46, wherein said decision rule is based on at least one of decision inputs from an external source, decision inputs from a centralized control station, and decision routines internal to said switch control logic.

48. The wireless communication system of claim 47, wherein said internal decision routines of said switch control logic includes

determining a number of said receive signal time slots having a first polarization state,

determining a number of said receive signal time slots having a second polarization state,

comparing said number of said receive signal time slots having said first polarization state to said number of said receive signal time slots having said second polarization state to determine which number is greater, and

directing said switch control mechanism to switch said transmit signals to an antenna element set having a polarization state that matches said polarization state of said greater number.

49. The wireless communication system of claim 48, wherein said antenna arrangement is configured as a multi-columnar antenna configuration, each column of said multi-columnar antenna configuration containing said sets of antenna elements.

50. The wireless communication system of claim 49, wherein said antenna element sets contain two opposing linearly-slanted polarization states.