Intelligent backhaul radio with adaptive channel bandwidth control

• US 8,824,442 B2
• Filed: 05/20/2013
• Issued: 09/02/2014
• Est. Priority Date: 08/17/2011
• Status: Active Grant

• Current Assignee: COMS IP Holdings LLC
• Original Assignee: CBF Networks, Inc. (COMSovereign Holding Corp.)
• Inventors: Lea, David Andrew G., Negus, Kevin J., Proctor, James A.
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): Sharma, Gautam
• Application Number:
  US13/898,429
• Publication Number:
  US 20130273974A1
• Time in Patent Office: 470 Days
• Field of Search: None
• US Class Current: 370/338
• CPC Class Codes: H01Q 1/246 specially adapted for base stations
• CPC Class Codes: H01Q 1/48 Earthing means; Earth screens; Counterpoises
• CPC Class Codes: H01Q 1/50 Structural association of antennas with earthing switches, lead-in devices or lightning protectors
• CPC Class Codes: H01Q 21/062 using dipole aerials; H01Q21/067, H01Q21/068 take precedence
• CPC Class Codes: H01Q 21/064 using horn or slot aerials slotted waveguides arrays H01Q21/005
• CPC Class Codes: H01Q 21/065 Patch antenna array
• CPC Class Codes: H01Q 21/24 Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction circularly polarised patch antennas H01Q9/0428; circularly polarised horns H01Q13/0241; cross-polarised horns H01Q13/0258; polarisation converters H01Q15/242; cross-polarised rear feeds H01Q19/136; crossed polarisation dual antenna H01Q25/001
• CPC Class Codes: H01Q 21/29 Combinations of different interacting antenna units for giving a desired directional characteristic H01Q25/00 takes precedence
• 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 25/001 Crossed polarisation dual antennas orthomode horns H01Q13/0258; cross-polarised rear feeds H01Q19/136; orthomode transducers H01P1/161
• CPC Class Codes: H01Q 25/005 providing two patterns of opposite direction; back to back antennas H01Q25/004 takes precedence
• CPC Class Codes: H04B 1/401 for selecting or indicating operating mode
• CPC Class Codes: H04B 1/50 using different frequencies for the two directions of communication
• CPC Class Codes: H04B 10/25 Arrangements specific to fibre transmission
• CPC Class Codes: H04B 7/0408 using two or more beams, i.e. beam diversity
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04B 7/088 using beam selection
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/004 by using forward error control H04L1/0618 takes precedence; coding, decoding or code conversion, for error detection or correction H03M13/00
• CPC Class Codes: H04L 1/18 : Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 25/03828 : Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties partial response systems H04L25/497
• CPC Class Codes: H04L 27/01 : Equalisers baseband equalizers at the transmitter end H04L25/03343; in analogue transmission systems H04B3/04, H04B7/005
• CPC Class Codes: H04L 27/2601 : Multicarrier modulation systems
• CPC Class Codes: H04L 27/2636 : with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
• CPC Class Codes: H04L 5/0007 : the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 88/08 : Access point devices

Abstract

A intelligent backhaul radio have an advanced antenna system for use in PTP or PMP topologies. The antenna system provides a significant diversity benefit. Antenna configurations are disclosed that provide for increased transmitter to receiver isolation, adaptive polarization and MIMO transmission equalization. Adaptive optimization of transmission parameters based upon side information provided in the form of metric feedback from a far end receiver utilizing the antenna system is also disclosed.

Claims

1. A first intelligent backhaul radio comprising:

a plurality of directional receive antenna arrays for simultaneously receiving a plurality of receive RF signals at the first intelligent backhaul radio, the plurality of receive RF signals comprising one or more of a plurality of transmit symbol streams transmitted by at least a second intelligent backhaul radio, wherein at least one of said one or more of said plurality of transmit symbol streams is for communication between the second intelligent backhaul radio and the first intelligent backhaul radio, wherein each of said plurality of directional receive antenna arrays comprise a plurality of receive antenna sub-arrays, wherein each of said plurality of receive antenna sub-arrays comprise a plurality of receive antenna elements;

one or more demodulator cores, wherein each demodulator core demodulates one or more receive symbol streams to produce one or more respective receive data interface streams;

a plurality of receive RF chains to convert the plurality of receive RF signals to a plurality of respective receive chain output signals;

a frequency selective receive path channel multiplexer, interposed between the one or more demodulator cores and the plurality of receive RF chains, the frequency selective receive path channel multiplexer to generate said one or more receive symbol streams from the plurality of receive chain output signals;

one or more selectable RF connections that selectively couple certain of the plurality of said receive antenna sub-arrays to certain of the plurality of receive RF chains, wherein the number of receive antenna sub-arrays that can be selectively coupled to receive RF chains exceeds the number of receive RF chains that can accept receive RF signals from the one or more selectable RF connections; and

a first radio resource controller,

wherein the first radio resource controller sets or causes to be set the selective couplings between the certain of the plurality of receive antenna sub-arrays and the certain of the plurality of receive RF chains, and

wherein the first radio resource controller sets or causes to be set at least a first receive channel bandwidth corresponding to said at least one of said one or more of said plurality of transmit symbol streams in response to a second control frame transmitted by the second intelligent backhaul radio and derived at the first intelligent backhaul radio from at least one of said one or more receive data interface streams.

2. A system comprising at least the first intelligent backhaul radio and the second intelligent backhaul radio of claim 1, wherein the second intelligent backhaul radio comprises:

a directional transmit antenna array, for transmitting said at least one of said one or more of said plurality of transmit symbol streams, said directional transmit antenna array comprising a plurality of transmit antenna sub-arrays, wherein each of said plurality of transmit antenna sub-arrays comprise a plurality of transmit antenna elements;

one or more modulator cores, wherein each of the one or more modulator cores modulates a respective transmit data interface stream to produce one or more of said plurality of transmit symbol streams;

a plurality of transmit RF chains to convert from a plurality of transmit chain input signals to a plurality of respective transmit RF signals comprising said plurality of transmit symbol streams;

a plurality of RF connections to couple at least certain of the plurality transmit antenna sub-arrays to the plurality of transmit RF chains; and

a plurality of adaptable transmitter finite impulse response filters, to set at least a first transmit channel bandwidth occupied by said at least one of said one or more of said plurality of transmit symbol streams, the plurality of adaptable transmitter finite impulse response filters interposed between the one or more modulator cores and the plurality of transmit RF chains,

wherein the second control frame is transmitted by the second intelligent backhaul radio to at least the first intelligent backhaul radio in connection with a change to said first transmit channel bandwidth.

3. The system of claim 2, further comprising at least a third intelligent backhaul radio.

4. The system of claim 3, wherein the third intelligent backhaul radio communicates with at least the second intelligent backhaul radio.

5. The system of claim 3, wherein the third intelligent backhaul radio communicates with at least the first intelligent backhaul radio.

6. The system of claim 2, wherein the first intelligent backhaul radio transmits a first control frame to at least the second intelligent backhaul radio in response to current link conditions at one or more of the plurality of receive RF chains of the first intelligent backhaul radio, said first control frame indicating a request to change said first transmit channel bandwidth.

7. The system of claim 2, wherein the second intelligent backhaul radio further comprises a second radio resource controller, and wherein the second control frame originates at the second radio resource controller for delivery to at least the first radio resource controller.

8. The system of claim 6, wherein said current link conditions are based upon interference experienced at one or more of the plurality of receive RF chains of the first intelligent backhaul radio.

9. The system of claim 8, wherein said interference is co-channel interference.

10. The system of claim 8, wherein said interference is interference from a link between at least two other intelligent backhaul radios.

11. The system of claim 8, wherein said interference is interference from a conventional point to point backhaul radio link.

12. The system of claim 2, wherein the second control frame is transmitted by the second intelligent backhaul radio to at least the first intelligent backhaul radio coincident with a change to said first transmit channel bandwidth.

13. The system of claim 2, wherein said first transmit channel bandwidth is different than at least one other transmit channel bandwidth occupied by at least one other of said plurality of transmit symbol streams.

14. The system of claim 2, wherein said first transmit channel bandwidth is different than at least one other transmit channel bandwidth occupied by at least one other of said one or more of said plurality of transmit symbol streams transmitted by the second intelligent backhaul radio.

15. The system of claim 2, wherein the second intelligent backhaul radio further comprises a second radio resource controller, and wherein the second radio resource controller sets or causes to be set said first transmit channel bandwidth.

16. The system of claim 2, wherein the first intelligent backhaul radio transmits a first control frame, said first control frame indicating a request to change a first transmit channel bandwidth occupied by said at least one of said one or more of said plurality of transmit symbol streams, to at least the second intelligent backhaul radio.

17. The first intelligent backhaul radio of claim 1, wherein the first intelligent backhaul radio transmits a first control frame to at least the second intelligent backhaul radio in response to current link conditions at one or more of the plurality of receive RF chains of the first intelligent backhaul radio, said first control frame indicating a request to change a first transmit channel bandwidth occupied by said at least one of said one or more of said plurality of transmit symbol streams.

18. The first intelligent backhaul radio of claim 17, wherein said current link conditions are based upon interference experienced at one or more of the plurality of receive RF chains of the first intelligent backhaul radio.

19. The first intelligent backhaul radio of claim 18, wherein said interference is co-channel interference.

20. The first intelligent backhaul radio of claim 18, wherein said interference is interference from a link between at least two other intelligent backhaul radios.

21. The first intelligent backhaul radio of claim 18, wherein said interference is interference from a conventional point to point backhaul radio link.

22. A first intelligent backhaul radio comprising:

a plurality of directional receive antenna arrays for simultaneously receiving a plurality of receive RF signals at the first intelligent backhaul radio, the plurality of receive RF signals comprising one or more of a plurality of transmit symbol streams transmitted by at least a second intelligent backhaul radio, wherein at least one of said one or more of said plurality of transmit symbol streams is for communication between the second intelligent backhaul radio and the first intelligent backhaul radio, wherein each of said plurality of directional receive antenna arrays comprise a plurality of receive antenna sub-arrays, wherein each of said plurality of receive antenna sub-arrays comprise a plurality of receive antenna elements;

one or more demodulator cores, wherein each demodulator core demodulates one or more receive symbol streams to produce one or more respective receive data interface streams;

a plurality of receive RF chains to convert the plurality of receive RF signals to a plurality of respective receive chain output signals;

a frequency selective receive path channel multiplexer, interposed between the one or more demodulator cores and the plurality of receive RF chains, the frequency selective receive path channel multiplexer to generate said one or more receive symbol streams from the plurality of receive chain output signals;

one or more RF connections that couple at least certain of the plurality of said receive antenna sub-arrays to at least certain of the plurality of receive RF chains; and

,

wherein the first intelligent backhaul radio utilizes at least a first receive channel bandwidth corresponding to said at least one of said one or more of said plurality of transmit symbol streams in response to a second control frame transmitted by the second intelligent backhaul radio and derived at the first intelligent backhaul radio from at least one receive data interface stream; and

wherein the first intelligent backhaul radio transmits a first control frame to at least the second intelligent backhaul radio in response to current link conditions at one or more of the plurality of receive RF chains of the first intelligent backhaul radio, said first control frame indicating a request to change a first transmit channel bandwidth occupied by said at least one of said one or more of said plurality of transmit symbol streams.

23. The first intelligent backhaul radio of claim 22, wherein said current link conditions are based upon interference experienced at one or more of the plurality of receive RF chains of the first intelligent backhaul radio.

24. The first intelligent backhaul radio of claim 23, wherein said interference is co-channel interference.

25. The first intelligent backhaul radio of claim 23, wherein said interference is interference from a link between at least two other intelligent backhaul radios.

26. The first intelligent backhaul radio of claim 23, wherein said interference is interference from a conventional point to point backhaul radio link.

27. The first intelligent backhaul radio of claim 22, further comprising:

a directional transmit antenna array, said directional transmit antenna array comprising a plurality of transmit antenna sub-arrays, wherein each of said plurality of transmit antenna sub-arrays comprise a plurality of transmit antenna elements;

wherein each of said receive antenna sub-arrays has a normalized antenna pattern similar to the normalized antenna pattern of each of the transmit antenna sub-arrays in elevation and narrower than the normalized antenna pattern of each of the transmit antenna sub-arrays in azimuth,

and wherein each of the plurality of directional receive antenna arrays are positioned physically offset from said directional transmit antenna array, and distributed in azimuthal orientation such that the aggregate normalized azimuthal antenna patterns of the plurality of receive antenna sub-arrays in composite is equal to or greater than the normalized antenna pattern of each of the transmit antenna sub-arrays in azimuth.

28. A system comprising at least the first intelligent backhaul radio and the second intelligent backhaul radio of claim 22, wherein the second intelligent backhaul radio comprises:

a directional transmit antenna array, for transmitting at least said at least one of said one or more of said plurality of transmit symbol streams, said directional transmit antenna array comprising a plurality of transmit antenna sub-arrays, wherein each of said plurality of transmit antenna sub-arrays comprise a plurality of transmit antenna elements;

one or more modulator cores, wherein each modulator core modulates a respective transmit data interface stream to produce one or more of said plurality of transmit symbol streams;

a plurality of transmit RF chains to convert from a plurality of transmit chain input signals to a plurality of respective transmit RF signals comprising said plurality of transmit symbol streams;

a plurality of RF connections to couple at least certain of the plurality transmit antenna sub-arrays to the plurality of transmit RF chains; and

a plurality of adaptable transmitter finite impulse response filters, to set at least said first transmit channel bandwidth, and interposed between the one or more modulator cores and the plurality of transmit RF chains,

wherein the second control frame is transmitted by the second intelligent backhaul radio to at least the first intelligent backhaul radio in connection with a change to said first transmit channel bandwidth.

29. The system of claim 28, further comprising at least a third intelligent backhaul radio.

30. The system of claim 29, wherein the third intelligent backhaul radio communicates with at least the second intelligent backhaul radio.

31. The system of claim 28, wherein the third intelligent backhaul radio communicates with at least the first intelligent backhaul radio.

32. The system of claim 28, wherein the second intelligent backhaul radio further comprises a second radio resource controller, wherein the first intelligent backhaul radio further comprises a first radio resource controller, and wherein the second control frame originates at the second radio resource controller for delivery to at least the first radio resource controller.

33. The system of claim 28, wherein said current link conditions are based upon interference experienced at one or more of the plurality of receive RF chains of the first intelligent backhaul radio.

34. The system of claim 33, wherein said interference is co-channel interference.

35. The system of claim 33, wherein said interference is interference from a link between at least two other intelligent backhaul radios.

36. The system of claim 33, wherein said interference is interference from a conventional point to point backhaul radio link.

37. The system of claim 28, wherein the second control frame is transmitted by the second intelligent backhaul radio to at least the first intelligent backhaul radio coincident with a change to said first transmit channel bandwidth.

38. The system of claim 28, wherein said first transmit channel bandwidth is different than at least one other transmit channel bandwidth occupied by at least one other of said plurality of transmit symbol streams.

39. The system of claim 28, wherein said first transmit channel bandwidth is different than at least one other transmit channel bandwidth occupied by at least one other of said one or more of said plurality of transmit symbol streams transmitted by the second intelligent backhaul radio.

40. The system of claim 28, wherein the second intelligent backhaul radio further comprises a second radio resource controller, and wherein the second radio resource controller sets or causes to be set said first transmit channel bandwidth.

41. The first intelligent backhaul radio of claim 22, further comprising a first radio resource controller, and wherein the first radio resource controller sets or causes to be set said first receive channel bandwidth.

42. The first intelligent backhaul radio of claim 22, wherein said first transmit channel bandwidth is different than at least one other transmit channel bandwidth occupied by at least one other of said plurality of transmit symbol streams.

43. The first intelligent backhaul radio of claim 22, wherein said first transmit channel bandwidth is different than at least one other transmit channel bandwidth occupied by at least one other of said one or more of said plurality of transmit symbol streams transmitted by the second intelligent backhaul radio.

44. The first intelligent backhaul radio of claim 22, wherein said first receive channel bandwidth is the same as said first transmit channel bandwidth.